Answer: The correct answer is Option B.
Explanation:
Combustion reaction is defined as the chemical reaction in which a hydrocarbon reacts with oxygen gas to produce carbon dioxide gas and water molecule. The chemical equation for this reaction follows:
[tex]\text{hydrocarbon}+O_2\rightarrow CO_2+H_2O[/tex]
Incomplete combustion is defined as the reaction in which supply of oxygen is limited and carbon monoxide gas is also produced as a product. The chemical equation for this reaction follows:
[tex]\text{hydrocarbon}+O_2\text{(limited)}\rightarrow CO+CO_2+H_2O[/tex]
Single displacement reaction is defined as the reaction in which more reactive element displaces a less reactive element.
[tex]AB+C\rightarrow CB+A[/tex]
Element C is more reactive than element A.
As, we can see that oxides are the products in both complete combustion reaction and incomplete combustion reaction.
Hence, the correct answer is Option B.
Oxides are chemical compounds comprising of oxygen and another element. They're most often formed during combustion, where oxygen reacts with another substance to produce an oxide. One example is the burning of coal which produces carbon dioxide.
Explanation:Oxides are chemical compounds that contain at least one oxygen atom and one other element. Most of the Earth's crust consists of solid oxides, the result of elements being oxidized by the oxygen in the air. Option B, 'Products formed during combustion.' is the most accurate. During combustion, oxygen reacts with a substance, resulting in the production of an oxide. For example, when you burn coal (which is mostly carbon), carbon dioxide (CO2) is one of the products formed.
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A chemistry student needs 60.00 g of butanoic acid for an experiment. He has available 120. g of a 36.9% w/w solution of butanoic acid in ethanol. Calculate the mass of solution the student should use. If there's not enough solution, press the "No solution" button.
Answer: There is no solution for the required amount of butanoic acid.
Explanation:
We are given:
Mass of butanoic acid needed = 60.00 grams
36.9 % w/w butanoic acid solution
This means that 36.9 grams of butanoic acid is present in 100 grams of solution
Applying unitary method:
If 36.9 grams of butanoic acid is present in 100 grams of solution
So, 60.00 grams of butanoic acid will be present in = [tex]\frac{100}{36.9}\times 60.00=162.6g[/tex]
As, the given amount of solution is less than the required amount.
Hence, there is no solution for the required amount of butanoic acid.
Final answer:
To obtain 60.00 g of butanoic acid from a 36.9% w/w solution, 162.6 g of the solution is needed. The student has only 120 g available, which is insufficient.
Explanation:
To determine how much of the 36.9% w/w butanoic acid solution is needed to obtain 60.00 g of butanoic acid, we use the percentage concentration to set up a calculation. The 36.9% w/w solution means that for every 100 g of solution, there are 36.9 g of butanoic acid. Therefore, to find the mass of the solution needed for 60.00 g of butanoic acid, we can use the equation:
Mass of solution = (Mass of butanoic acid)/(Percentage of butanoic acid by mass) × 100
This yields:
Mass of solution = (60.00 g)/(0.369) × 100 = 162.6 g
Since the student has 120 g of the solution available, which is less than the 162.6 g required, there is not enough solution to obtain 60.00 g of butanoic acid.
Please help! I'd appreciate it a lot!
Answer:
6 is B, 7 is A
Explanation:
A certain substance has a mass per mole of 47 g/mol. When 312 J is added as heat to a 34.0 g sample, the sample's temperature rises from 24.0°C to 44.0°C. What are the (a) specific heat and (b) molar specific heat of this substance? (c) How many moles are present?
Answer:
(a) 0.459 Jg⁻¹°C⁻¹
(b) 22 Jmol⁻¹°C⁻¹
(c) 0.72 moles
Explanation:
(a) The specific heat capacity can be calculated using the following equation:
Q = mcΔt, where Q is the heat energy, m is the mass, c is the specific heat capacity, and Δt is the temperature change from initial to final.
Rearranging the equation to solve for c gives:
c = Q / (mΔt) = (312J) / ((34.0g)(44.0°C - 24°C) = 0.459 Jg⁻¹°C⁻¹
(b) To find the molar specific heat, grams in the above result must be converted to moles using the mass per mole:
(0.459 Jg⁻¹°C⁻¹)(47g/mol) = 22 Jmol⁻¹°C⁻¹
(c) The numer of moles present are found by converting grams to moles using the mas per mole:
(34.0g)(mol/47g) = 0.72 moles
Which of the following is not a chemical property of a substance?
- turns green when dissolved in water
- produces white flame when exposed to oxygen
- gives off brown fumes when treated with nitric acid
- conducts electricity
- reacts with chlorine
Answer:
First of all you need to know that chemical properties are those who are determined by chemical tests and are related to the reactivity of chemical substances. In those statements you have 4 reactions, except on "conducts electricity". That is a physical property.
Explanation:
A chemical reaction is a way in which the atoms of the elements regroup to form new substances.
Final answer:
Conducts electricity is a physical property and not a chemical property. Chemical properties are those that can only be observed when a substance undergoes a chemical change to become a different substance.
Explanation:
Among the options provided, the only feature that is not a chemical property is conducts electricity, as this is a physical property related to the substance's ability to allow the passage of electric current, which can be observed without changing the identity of the substance. Chemical properties, on the other hand, involve the substance's ability to undergo a chemical change. For example, reacting with oxygen to produce a white flame, turning green when dissolved in water, giving off brown fumes when treated with nitric acid, and reacting with chlorine are all indicative of chemical changes because they result in the formation of new substances with different compositions.
Phosphorus can be prepared from calcium phosphate by the following reaction:
2Ca₃(PO₄)₂+6SiO₂+10C --> 6CaSiO₃+P₄+10CO
Phosphorite is a mineral that contains Ca₃(PO₄)₂ plus other non-phosphorus-containing compounds. What is the maximum amount of P₄ that can be produced from 1.0 kg of phosphorite if the phorphorite sample is 75% Ca₃(PO₄)₂ by mass? Assume an excess of the other reactants.
The maximum amount of tetraphosphorus (P4) that can be produced from 1.0 kg of 75% pure phosphorite is approximately 149.69 grams, considering the reaction with silicon dioxide and carbon in excess.
The student has asked about the amount of tetraphosphorus (P4) that can be produced from 1.0 kg of phosphorite, which is 75% calcium phosphate (Ca3(PO4)2) by mass, assuming an excess of the other reactants. In the industrial preparation of phosphorus, calcium phosphate is chemically reduced to form tetra phosphorus, which has several applications, including the manufacture of fertilizers, pesticides, and special alloys.
The first step is to calculate the mass of pure Ca3(PO4)2 available in the 1.0 kg of phosphorite. Since the phosphorite sample is 75% Ca3(PO4)2, this means there is 0.75 kg (or 750 g) of Ca3(PO4)2 present. Using the molar mass of Ca3(PO4)2 (310.18 g/mol) and the stoichiometry of the reaction, we find the corresponding moles of P4 produced.
For every 2 moles of Ca3(PO4)2 used, 1 mole of P4 is formed. Therefore, we calculate (750 g / 310.18 g/mol) / 2 = 1.208 mol of P4. To find the mass, we multiply the moles of P4 by its molar mass (123.89 g/mol), resulting in 149.69 g of P4 produced from 1.0 kg of phosphorite.
The information below describes a redox reaction.
What is the final, balanced equation for this reaction?
Answer:
The answer to your question is the first option
Explanation:
Just remember that to balance using this method,
first look for the elements that change their oxidation number, and
later count the number of electrons that changed,
later identify which element oxidazes and which reduces and
finally cross the number of electrons that change in each semireaction and write these numbers in the main reaction.
2Cr⁺³ (aq) + 6Cl⁻ (aq) ⇒ 2Cr(s) + 3Cl₂ (g)
2 Cr 2
6 Cl 6
Answer:
The answer is the first option
Explanation:
Just took the test
Have a great day
Anna is 100 lb and will be infused with 125 mg dobutamine in 500 ml NS at 10 mcg/kg/min. How many milligrams of dobutamine will she receives/ hour? Your answer is in mg/h.
Answer:
27.216 mg/h.
Explanation:
First you need to convert 100 lb to kg, and there are 45.36 kg, she will receive 10 mcg/kg/min so if you multiply it by 45.36 kg, she will receive 453.6 mcg/min, so in one hour (60 minutes) she will receive 27216 mcg/h, 1000 mcg are 1 mg, so she will receive 27.216 mg/h.
When M2S3(s) is heated in air, it is converted to MO2(s). A 3.280 g sample of M2S3(s) shows a decrease in mass of 0.228 g when it is heated in air. What is the average atomic mass of M?
Answer:
The average atomic mass of M is 181.33 g/mol.
Explanation:
First off we need to know the reaction that takes place. The balanced reaction of M₂S₃(s) is:
M₂S₃(s) + O₂(g) ⇒2MO₂(s) + 3SO₂(g)The important section for this problem is this:
M₂S₃(s) ⇒2MO₂(s)**Thus, the number of moles of M in M₂S₃ is equal to the number of moles of M in 2MO₂.
The decrease in mass means that M₂S₃ reacted and produced MO₂, thus the mass of MO₂ is 3.280-0.228=3.052 g
Now let's say x is the atomic weight of M, and write the molecular weights (Mw) of those two compounds:
Mw of M₂S₃= 2x + 96 g/mol
Mw of MO₂= x + 32 g/mol
Now we determine the moles of each compound, using the formula [ moles = mass / molecular weight ]:
Moles of M₂S₃= [tex]\frac{3.280g}{2x+96g/mol}[/tex]
Moles of MO₂= [tex]\frac{3.052g}{x+32g/mol}[/tex]
Using the equivalence marked by asterisks, we're left with (note that the second denominator is multiplied by 2 because of the reaction coefficients):
[tex]\frac{3.280g}{2x+96g/mol}=\frac{3.052g}{2x+64g/mol}[/tex]
We solve for x:
[tex]\frac{3.280g}{3.052g}=\frac{2x+96g/mol}{2x+64g/mol[tex]1.075*(2x+64g/mol)=2x+96g/mol\\2.150x+68.8g/mol=2x+96g/mol\\0.150x=27.2g/mol\\x=181.33g/mol[/tex]}[/tex]
Thus, the average atomic mass of M is 181.33 g/mol.
The average atomic mass of M was calculated from the mass loss during the conversion of M2S3 to MO2. It was found by comparing the moles of sulfur lost to the moles of M present and then calculating the mass per mole of M, yielding a value of 642.53 g/mol.
Explanation:To determine the average atomic mass of M from the conversion of M2S3 to MO2, we begin by understanding that the loss of mass is due to the conversion of sulfur (S) in M2S3 to sulfur dioxide (SO2) in air. Given that the mass decrease is 0.228 g, this corresponds to the mass of sulfur that was converted to SO2.
Since the molar mass of sulfur is 32 g/mol, we can find the moles of sulfur that were lost:
0.228 g / 32 g/mol = 0.007125 mol of sulfur lost. Because the compound is M2S3, the loss of three moles of sulfur corresponds to two moles of M being present. Using the moles of sulfur lost, we can set up a proportion to find the moles of M:
3 moles of S : 2 moles of M
0.007125 moles of S : X moles of M
This gives us X = (2/3) * 0.007125 moles of M = 0.00475 moles of M.
The original mass of M2S3 was 3.280 g. After heating and the loss of sulfur, the remaining mass corresponds to M in the compound MO2. Therefore, we subtract the mass of sulfur lost from the original mass to find the mass of M:
Mass of M = 3.280 g - 0.228 g = 3.052 g
Finally, we can calculate the average atomic mass of M:
Average atomic mass of M = 3.052 g / 0.00475 mol = 642.53 g/mol (rounded to two decimal points)
Gaseous hydrogen iodide is placed in a closed container at 425°C, where it partially decomposes to hydrogen and iodine: 2HI(g)⇌H₂(g)+I₂(g) At equilibrium it is found that [HI]= 3.51×10⁻³ M, [H₂]= 4.76×10⁻⁴ M, and [I₂]= 4.76×10⁻⁴ M.
What is the value of [tex]K_c[/tex] at this temperature? Express the equilibrium constant to three significant digits.
Answer : The value of [tex]K_c[/tex] at this temperature is 0.0184
Explanation : Given,
Concentration of [tex]HI[/tex] at equilibrium = [tex]3.51\times 10^{-3}M[/tex]
Concentration of [tex]H_2[/tex] at equilibrium = [tex]4.76\times 10^{-4}M[/tex]
Concentration of [tex]I_2[/tex] at equilibrium = [tex]4.76\times 10^{-4}M[/tex]
The given equilibrium reaction is,
[tex]2HI(g)\rightleftharpoons H_2(g)+I_2(g)[/tex]
The expression of [tex]Kc[/tex] will be,
[tex]K_c=\frac{[H_2][I_2]}{[HI]^2}[/tex]
Now put all the given values in this expression, we get:
[tex]K_c=\frac{(4.76\times 10^{-4})\times (4.76\times 10^{-4})}{(3.51\times 10^{-3})^2}[/tex]
[tex]K_c=0.0184[/tex]
Therefore, the value of [tex]K_c[/tex] at this temperature is 0.0184
Final answer:
The equilibrium constant, Kc, for the decomposition of gaseous hydrogen iodide into hydrogen and iodine at 425°C, given the concentrations at equilibrium, is calculated as 1.84×10⁻².
Explanation:
The question asks about the calculation of the equilibrium constant, Kc, for the decomposition of hydrogen iodide into hydrogen and iodine at 425°C. The provided concentrations at equilibrium are [HI] = 3.51×10⁻³ M, [H₂]= 4.76×10⁻⁴ M, and [I₂]= 4.76×10⁻⁴ M.
To find Kc, we use the expression Kc = [H₂][I₂]/[HI]². Plugging in the given values:
Kc = (4.76×10⁻⁴ M)×(4.76×10⁻⁴ M) / (3.51×10⁻³ M)²
Kc = (2.26×10⁻⁷ M²) / (1.23×10⁻⁵ M²)
Kc = 1.84×10⁻²
To express Kc to three significant digits, Kc = 1.84×10⁻².
A substance that forms a vapor is generally in what physical state at room temperature?
Water molecules are ____________ because the hydrogen atoms are positively charged on one end and the oxygen atoms are negatively charged on one end. Molecules that are ____________ share electrons equally. Sodium chloride (NaCl) is an example of a ____________ molecule because it is soluble in water. Molecules that are ____________ are insoluble in water. It is ____________ that most molecules formed with nonpolar bonds dissolve easily in water.
Answer:
What is your question?
High School Chemistry 10+5 pts
Water molecules are _____polar_______ because the hydrogen atoms are positively charged on one end and the oxygen atoms are negatively charged on one end. Molecules that are _____nonpolar_______ share electrons equally. Sodium chloride (NaCl) is an example of a ______polar______ molecule because it is soluble in water. Molecules that are _____nonpolar_______ are insoluble in water. It is ______false______ that most molecules formed with nonpolar bonds dissolve easily in water.
If 1.00L of muriatic acid w/ a pH of 2.5 is poured to 8.00L water, what is the new molar concentration of the muriatic solution? Hint: use C1•V1 = C2•V2
Answer:
The answer to your question is: C2 = 0.0004 M
Explanation:
Data
pH = 2.5; V = 1.0 L
V2 = 8.0 L C2 = ?
Formula
C1V1 = C2V2
C2 = C1V1 / V2
pH = -log[H⁺]
Process
[H⁺] = antilog -pH
[H⁺] = antilog (-2.5)
[H⁺] = 0.003 M = C1
Finally
(0.003)(1 l) = C2(8)
C2 = 0.003 / 8
C2 = 0.0004 M
Need help please omg Perform each of the following conversions being sure to set up the appropriate conversion factor in each case 59. a. 12.5 in to centimeters c. 2513ft to miles 60. a. 2.23m to yards. c. 292cm to inches Please show work
Answer:
The answer to your question is:
a) 31.75 cm
b) 0.475 miles
c) 2.44 yards
d) 11496.04 inches
Explanation:
Convert
a) 12.5 in to cm
1 in ------------------- 2.54 cm
12.5 in ---------------- x
x = 12.5(2.54)/1 = 31.75/ = 31.75 cm
b) 2513 ft to miles
1 mile -------------- 5280 ft
x miles ------------ 2513 ft
x = 2513(1)/5280 = 0.475 miles
c) 2.23 m to yards
1 m ------------- 1,094 yards
2.23 m ---------- x
x= 2.23x1.094/1 = 2.44 yards
d) 292 m to inches
1 m ---------------- 39.37 inches
292 m ------------- x
x = 292 x 39.37/1 = 11496.04 inches
What information do the coefficients in a balanced chemical equation tell you?
the amount of energy from the products
the ratios of the number of moles of each substance that react and that are produced
the physical states of the compounds reacting
the elements involved in the reaction
Answer:
The correct answer to your question is the second option
Explanation:
The amount of energy from the products This option is not correct because in a chemical reaction the energy given off or absorved is written at the end of the reaction, it is not a coefficient.
The ratios of the number of moles of each substance that react and that are produced This option is correct, coefficients tell the number of moles of each substance in a reaction.
The physical states of the compounds reacting Physical states are written next to the molecule and using parenthesis. Incorrect
The elements involved in the reaction Incorrect because elements are written with symbols not with coefficients.
Final answer:
The coefficients in a balanced chemical equation represent the molar ratios of reactants and products in a chemical reaction, which are essential for stoichiometric calculations and ensure adherence to the Law of Conservation of Mass.
Explanation:
The coefficients in a balanced chemical equation tell us the ratios of the number of moles of each substance that react and that are produced during the chemical reaction. These coefficients indicate the relative amounts of reactants and products in a reaction and are used in stoichiometry to determine the quantities of one substance that will react with or produce a given amount of another substance.
Stoichiometry is the study of the numerical relationships between the reactants and the products in balanced chemical reactions. The coefficients in a balanced chemical equation also respect the Law of Conservation of Mass, ensuring that the number of atoms of each element is equal on both the reactant and product sides of the equation. These ratios are referred to as stoichiometric factors and are critical in performing quantitative chemical calculations.
A sample of gas at a pressure of 121.59 kPa, a volume of 31 L, and a temperature of 360 K contains how many moles of gas? A. 0.71 mol B. 0.96 mol C. 1.3 mol D. 1.8 mol
Answer:
C. 1.3 mol
Explanation:
PV = nRT
where P is absolute pressure,
V is volume,
n is number of moles,
R is universal gas constant,
and T is absolute temperature.
Given:
P = 121.59 kPa
V = 31 L
T = 360 K
R = 8.3145 L kPa / mol / K
Find: n
n = PV / (RT)
n = (121.59 kPa × 31 L) / (8.3145 L kPa / mol / K × 360 K)
n = (3769.29 L kPa) / (2993.22 L kPa / mol)
n = 1.26 mol
Round to two significant figures, there are 1.3 moles of gas.
When the compound, Ca(NO3)2, is mixed with water, the Ca(NO3)2 is:
soluble because all Ca+2 compounds are soluble in water
insoluble because most Ca+2 compounds are insoluble in water
soluble because all NO3−1 compounds are soluble in water
insoluble because NO3−1 compounds are usually insoluble in water
Answer:
The answer t your question is below:
Explanation:
When a salt is mixed with water, it will form ions, these ions are soluble in water.
Example: Ca(NO3)2 ⇒ Ca⁺² + 2 NO₃⁻¹
Both Ca⁺² and NO₃⁻¹ are soluble in water.
Then the answer to your question is:
Soluble because all Ca+2 compounds are soluble in water
Soluble because all NO3−1 compounds are soluble in water
Ca(NO3)2 is soluble in water because all nitrate compounds are soluble in water regardless of the cation they are paired with.
Explanation:When the compound Ca(NO3)2 is mixed with water, the Ca(NO3)2 is soluble because all NO3−1 compounds are soluble in water. This is generally based on the solubility rules of ionic compounds in water where all nitrates (NO3-) are soluble, regardless of the cation they are paired with. Thus, in spite of the solubility trends of calcium (Ca+2), the nitrate (NO3-) ion dictates the solubility of this compound in water, making it soluble.
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1. Alginate is
a. Reversible Hydrocolloid impression material
b. Irreversible Hydrocolloid impression material
c. Polysulfideimpression material
d. Polyvinyl siloxane impression material
Answer:
Option b, Irreversible hydrocolloid impression material
Explanation:
Irreversible is used as an impression material to take impression from edentulous jaws. It is also used in wound healing and drug delivery.
Alginate is a natural polymer found in cell wall of brown seaweed.
Its monomers are β-D-mannuronate and α-L-guluronate.
In association with Ca2+, it forms gel. It is hydrophilic in nature.
PLEASE HELP IM SO CONFUSED
1. Identify the SI unit(s) that would be most appropriate for measuring each of the following:
A) the length of a new pencil (cm)
B) the width of your classroom (dam)
C) the length of your arm (m)
D) the diameter of pencil lead (μm)
2. Identify the SI unit(s) that would be most appropriate for massing each of the following:
A) a person (m)
B) a banana (
C) your daily vitamin tablet (
D) a pencil (cm)
3. Identify the SI unit(s) that would be most appropriate for measuring each of the following:
A) a glass of milk
B) the amount of water required to fill a glass of water (
(C) a dose of cough syrup (
(D) a truckload of sand
4. Rank the measurements within each set from largest to smallest:
(A) 1.2m, 750cm, .005km, 65dm, and 2000mm
B) 450mg, 3.8cg, .27dg, .50g, and .00047kg
c.) 2.5L, 22cL, 13dL, 870mL, and 175cm3
Answer:
1. Identify the SI unit(s) that would be most appropriate for measuring each of the following:
A) the length of a new pencil (cm)
B) the width of your classroom (m)
C) the length of your arm (cm)
D) the diameter of pencil lead (mm)
2. Identify the SI unit(s) that would be most appropriate for massing each of the following:
A) a person (kg)
B) a banana ( g)
C) your daily vitamin tablet (mg)
D) a pencil (g)
3. Identify the SI unit(s) that would be most appropriate for measuring each of the following:
A) a glass of milk (mL)
B) the amount of water required to fill a glass of water (mL)
(C) a dose of cough syrup (mL)
(D) a truckload of sand (m³)
4. Rank the measurements within each set from largest to smallest:
(A) 1.2m, 750cm, 0.005km, 65dm, and 2000mm
65 dm, 750 cm, 0.005km, 2000 mm; 1.2 m
B) 450mg, 3.8cg, 0.27dg, 0.50g, and 0.00047kg
0.27 dg, 0.50 g, 0.0047 kg, 450 mg, 3.8 cg
c.) 2.5L, 22cL, 13dL, 870mL, and 175cm3
13dL, 2.5L, 870 mL, 22cL, 0.175 L
Explanation:
The International System of Units is inherited from the old decimal metric system. One of the main characteristics is that the units are based on physical phenomena. The units of the S.I. they are the reference for the indications of the measuring instruments, and are found by means of calibrations. The International System of Units has seven basic units, called fundamental units. By combining the basic units the other units are obtained, called units derived from the International System.
1) The SI Units for Length are; The length of a new pencil: cm (centimeters), The width of your classroom: dam (decameters), The length of your arm: m (meters), The diameter of pencil lead: μm (micrometers). 2) The SI Units for Mass: A person: kg (kilograms), A banana: g (grams), Your daily vitamin tablet: mg, A pencil: g . 3) SI Units for Volume: A glass of milk: L, The amount of water required to fill a glass of water: mL (milliliters), A dose of cough syrup: mL, A truckload of sand: m3 (cubic meters). 4) Measurements of Length:1.2 m 65 dm (decimeter) 750 cm (centimeter) 2000 mm (millimeter) 0.005 km, Measurements of Mass: 0.00047 kg 0.27 dg 0.50 g (gram) 3.8 cg 450 mg (milligram), Measurements of Volume: 2.5 L 13 dL , 22 cL (centiliter) 870 mL (milliliter) 175 cm³ (cubic centimeter).
1) The SI units for measuring each of the given quantities are;
The length of a new pencil: cm (centimeters)
Centimeters are a suitable SI unit for measuring the length of a new pencil. Centimeters are a commonly used unit for relatively small measurements, and they are well-suited for measuring objects like pencils, which are typically a few tens of centimeters in length.
The width of your classroom: dam (decameters)
Decameters (dam) are not commonly used for measurements like the width of a classroom.
The length of your arm: m (meters)
Meters are a suitable unit for measuring the length of larger objects like body parts. The length of an arm is typically measured in meters because it is a relatively substantial length compared to centimeters or millimeters.
The diameter of pencil lead: μm (micrometers)
Micrometers (μm) are the most appropriate unit for measuring the diameter of pencil lead.
2) Identify the appropriate SI unit for measuring mass:
Mass of a person: kg (kilograms)
Kilograms are the most appropriate SI unit for measuring the mass of a person. Kilograms are a standard unit of mass and are used for measuring larger objects, including humans.
Mass of a banana: g (grams)
Grams are a suitable SI unit for measuring the mass of smaller objects like a banana. Bananas typically have masses that fall within the gram range.
Mass of your daily vitamin tablet: mg (milligrams)
Milligrams are the most appropriate SI unit for measuring the mass of a small object like a daily vitamin tablet.
Mass of a pencil: g (grams)
Grams are suitable for measuring the mass of objects like pencils. Pencils are relatively light and fall within the range of grams.
3) SI unit for measuring each of the given quantities;
A glass of milk: L (liters); Liters are a suitable SI unit for measuring the volume of liquids like a glass of milk.
The amount of water required to fill a glass of water: mL (milliliters); Milliliters are the most appropriate SI unit for measuring smaller quantities of liquids like the amount of water needed to fill a glass.
A dose of cough syrup: mL (milliliters); Similar to the previous case, milliliters are the most suitable SI unit for measuring the volume of a dose of cough syrup.
A truckload of sand: m³ (cubic meters); Cubic meters are the most appropriate SI unit for measuring large volumes, such as a truckload of sand.
4) The measurements in each set from largest to smallest:
In set A, the measurements are given in various units of length. To rank them from largest to smallest, we simply convert all measurements to the same unit (for example, millimeters) and then compare their numerical values. Larger numerical values represent larger measurements.
In set B, the measurements are given in various units of mass. Similar to set A, we can convert all measurements to the same unit (for example, milligrams) and then rank them based on their numerical values. Larger numerical values represent larger masses.
In set C, the measurements are given in various units of volume. Liters and milliliters are common units for volume, and cubic centimeters (cm³) are also used for measuring volume. In this case, we can directly compare the values since they are all volume measurements.
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Which of the following statements is true?
Most nonmetals can be drawn into a wire, while metals would break apart.
Most metals can be drawn into a wire, while nonmetals would break apart.
Most metals and nonmetals conduct heat well, but nonmetals cannot conduct electricity.
Most metals and nonmetals conduct electricity well, but metals cannot conduct heat.
Answer:
Most metals can be drawn into a wire, while nonmetals would break apart.
Explanation:
Most of the metals can be drawn into wire without breaking because their tensile strength is high. This property of metals is known as ductility.
Non metals on the other hand do not have this ability because they are brittle and tend to break apart because their tensile strength is very low.
The examples of metals which are generally used for making wires are aluminium, iron, copper etc. and rarely gold and silver are used for making wires for expensive equipments like computers.
The true statement is that most metals can be drawn into a wire, while nonmetals would break apart. Most metals are malleable and ductile, and can conduct both heat and electricity, while nonmetals are brittle and are usually poor conductors.
Explanation:The correct statement among the options given is: 'Most metals can be drawn into a wire, while nonmetals would break apart.'
Most metals are malleable and ductile, meaning they can be reshaped without breaking. That's why we can draw them into wires. On the other hand, most nonmetals are brittle and would break or shatter if you tried to draw them into a wire. Similarly, while both metals and nonmetals can be thermal insulators or conductors, it is generally true that metals are good conductors of both heat and electricity, while nonmetals are poor conductors.
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Assume that it takes 64.25 mL of a 0.1555 M HCl solution to fully neutralize the calcium carbonate from one Tums tablet. How many milligrams of calcium carbonate are in the Tums tablet? Assume that there are no other ingredients that will react with the acid.
364667 milligrams of calcium carbonate will be in the Tums tablets that contains 64.25 mL of a 0.1555 M HCl solution.
How to calculate mass?The mass of a substance can be calculated using the following formula:
molarity = no of moles ÷ volume
no of moles = 64.25 × 0.1555 = 9.99moles
no of moles = mass/molar mass
Molar mass of HCl = 36.5g/mol
mass = 36.5 × 9.99 = 364.7g
Therefore, 364667 milligrams of calcium carbonate will be in the Tums tablets that contains 64.25 mL of a 0.1555 M HCl solution.
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The Tums tablet contains 500 milligrams of calcium carbonate, calculated by using stoichiometry based on the volume and molarity of HCl solution needed to neutralize it.
Explanation:The question involves calculating the mass of calcium carbonate in a Tums tablet based on the volume and molarity of HCl used to neutralize it. We know that it takes 64.25 mL of a 0.1555 M HCl solution to fully neutralize the tablet. Using the stoichiometry of the reaction between calcium carbonate and hydrochloric acid:
CaCO3(s) + 2HCl(aq) → CaCl2(s) + CO2(g) + H2O(l)
We can determine the number of moles of HCl reacted:
mole HCl = (0.06425 L) * (0.1555 M) = 0.009993 mol HCl
Since it takes 2 moles of HCl to react with 1 mole of CaCO3, we can find the moles of CaCO3:
mole CaCO3 = 0.009993 mol HCl / 2 = 0.0049965 mol
The molar mass of calcium carbonate (CaCO3) is approximately 100.09 g/mol. We can now find the mass:
mass CaCO3 = 0.0049965 mol * 100.09 g/mol = 0.500 g or 500 mg
The Tums tablet contains 500 milligrams of calcium carbonate.
A solution of CaCl₂CaCl₂ in water forms a mixture that is 31.0%31.0% calcium chloride by mass. If the total mass of the mixture is 650.5 g,650.5 g, what masses of CaCl₂CaCl₂ and water were used?
Answer:
There is used 201,655 grams CaCl2 and 448,845 grams of water (H2O)
Explanation:
w% = m(CaCl2) / m(total) x 100%
-> (m(Cacl2) = m(total) x w% ) / 100 %
-> m(CaCl2) = (650,5g x 31%) / 100% = 201,655g
Total mass : m(total) = m(CaCl2) + m(H2O)
-> m(H2O) = m(total) - m(CaCl2)
->m(H2O) = 650,5g - 201,655g = 448,845g
Identify the combustion reaction
The combustion reaction that can be identified is Al₂S₃ + 2Al + 3S and represents the combustion of aluminum sulfide (Al₂S₃), a compound of aluminum and sulfur.
Aluminum sulfide (Al₂S₃) reacts with oxygen (O₂) from the air to form aluminum oxide (Al₂O₃) and sulfur dioxide (SO₂). Aluminum oxide (Al₂O₃) is a white, solid compound that is often formed as a byproduct of aluminum smelting. which has found applications in various industrial applications, such as ceramics, pigments, and refractories.
Sulfur dioxide (SO₂) is a colorless gas with a pungent odor and is a major air pollutant that can cause respiratory problems and acid rain. Heat is released during the combustion reaction, which can be harnessed for various purposes, such as generating electricity or powering industrial processes.
Which of the statements describes a chemical property?
a) Iodine (a purple solid) becomes a purple gas.
b) Titanium is less dense than iron.
c) Sugar burns in air to form water and carbon dioxide.
d) Water boils at 100 ∘C.
Answer:
The answer to your question is letter c) Sugar burns in air to form water and carbon dioxide.
Explanation:
Exist two kinds of phenomena: physical and chemical
physical phenomena are when matter only changes its physical state, like evaporation, condensation, sublimation, etc.
chemical phenomena are when matter changes, react and form a new compound.
a) Iodine (a purple solid) becomes a purple gas. This is a physical change, sublimation, this answer is wrong.
b) Titanium is less dense than iron. Density is a physical property of matter, this answer is incorrect.
c) Sugar burns in air to form water and carbon dioxide. Sugar in transform into water and carbon dioxide, this is the right answer.
d) Water boils at 100 ∘C. Evaporation is a physical change, the answer is wrong.
The statement describing the chemical property has been the burning of sugar in air to form carbon dioxide and water. Thus, option C is correct.
The property of the element has been given as the physical and chemical property.
The physical property has been defined as the one in which the chemical composition has not been changed. It has been based on the appearance of the compound.
The chemical property has been the reactivity of the compound that results in the change in the chemical composition with the formation of new products.
Chemical propertyThe following changes have been classified as:
Iodine becomes purple:It has been the appearance and no change in the chemical composition. Thus, it is a physical property.
Titanium, less dense than iron:It has been based on the comparative density. There has been no reaction and change in chemical composition. Thus, it is a physical property.
Sugar burns in airThe burning of sugar results in the change in the chemical composition with the formation of new product. Thus, it has been a chemical property.
Boiling of waterThe boiling and freezing results in the change in state of matter. There has been no change in the chemical composition, Thus, it has been a physical change.
Hence, the statement describing the chemical property has been the burning of sugar in air to form carbon dioxide and water. Thus, option C is correct.
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In the first step of hydroboration mechanism, why is an arrow drawn from the pi bond of the alkene to the B atom of the borane reagent signifying the pi electrons are used to make a new C-B bond? See the background information presented with Part I.
Answer:
The borane reagent acts as a Lewis acid because it is electron-deficient.
Explanation:
The borane reagent is electron-deficient because it does not have a complete octet. Thus, it is electrophilic and accepts donation of the electrons from the alkene.
The electron deficiency of borane makes it electrophilic, driving its reactivity in the hydroboration reaction. Its eagerness to acquire electrons from the alkene initiates the process, enabling the formation of a C-B bond, which is essential in organic synthesis and serves as the basis for various chemical transformations.
The electron-deficient nature of the borane reagent plays a pivotal role in the hydroboration reaction, as it renders the borane electrophilic, ready to accept electron pairs from the alkene. This unique characteristic of borane can be attributed to its incomplete electron configuration, particularly the lack of a complete octet in its valence shell.
Borane (B2H6) is electron-deficient because boron, the central atom in borane, possesses only three valence electrons. This is in contrast to the octet rule, a fundamental principle in chemistry, which suggests that atoms tend to acquire a stable electron configuration, often characterized by eight electrons in their valence shell. Due to its deficiency of valence electrons, boron is left "wanting" more electrons to complete its octet.
The electron deficiency makes borane an electrophile, which is a species that is electron-hungry and seeks to gain additional electrons to achieve a stable electron configuration. In the hydroboration reaction, borane acts as an electrophile by accepting a pair of electrons from the pi bond of the alkene. This electron transfer results in the formation of a new carbon-boron (C-B) sigma (σ) bond, marking the initiation of the hydroboration process.
The electrophilic nature of borane, driven by its electron deficiency, allows it to participate in chemical reactions with nucleophiles, such as alkenes, where electron-rich species readily donate electron pairs. The resulting organoboron compound serves as a versatile intermediate for subsequent transformations in organic synthesis.
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Refer to the following elements to answer the questions below. 126C168O11H147N3216S3115P, where the upper index is atomic mass and the lower index is atomic number. How many electrons will a single atom of sulfur with no charge and no bonds have in its valence shell?
Answer: The number of valence electrons in sulfur atom are 6.
Explanation:
The isotopic representation of sulfur atom is [tex]_{16}^{32}\textrm{S}[/tex]
Valence electrons are defined as the electrons that are present in the outer most orbital of an atom. Electrons present in the orbitals having highest principle quantum number are termed as valence electrons.
Sulfur is the 16th element of the periodic table having 16 electrons.
Electronic configuration of sulfur atom is [tex]1s^22s^22p^63s^23p^4[/tex]
The number of valence electrons present in sulfur atom are 2 + 4 = 6
Hence, the number of valence electrons in sulfur atom are 6.
A balloon is filled with 35.0 L of helium in the morning when the temperature is 20.0C. By noon the temperature has risen to 45.0C. What is the new volume of the balloon?
A
2.5L
B
3.5L
C
4.5L
D
5.5L
Answer:
The question to your answer is: V2 = 78.75 l non if the options given
Explanation:
Data
V1 = 35 l
T1 = 20 °C
T2 = 45°C
V2 = ?
Formula
V1 / T1 = V2 / T2
Clear V2 from the equation
V2 = V1T2/T1
Substitution
V2 = (35)(45) / (20)
V2 = 78.75 l
Answer:
The new volume of the balloon is 78.75 L
Explanation:
Charles's law relates the volume and temperature of an ideal gas, to a constant pressure, therefore we must use that ratio to calculate the final temperature, according to the data provided:
Vinitial = 35 L
Tinitial = 20ºC
Vfinal = ?
Tfinal = 45ºC
Vfinal = (Vinitial x Tfinal)/Tinitial = (35 L x 45ºC)/20ºC = 78.75 L
In an ionic compound, the size of the ions affects the internuclear distance (the distance between the centers of adjacent ions), which affects lattice energy (a measure of the force need to pull ions apart), which affects the enthalpy of solution. Based on ion sizes, rank these compounds by their expected heats of solution. Most exothermic to most endothermic. Substances are Kf Kl KBr KCl
Answer:
Most exothermic
Kl
KBr
KCl
KF
Most endothermic
Explanation:
There is the presence of the same cation in the given salts, so only anion has to be compared.
The charge density of the anion decreases from the fluoride to the iodide as size increases from fluoride to iodide. Fluoride has highest charge density because of the smallest radius in halogen family. Also, potassium fluoride would have highest lattice enthalpy because there will be greater force of attraction between them. The trend for the lattice enthalpy is:
KF>KCl>KBr>KI
Since more energy to split KF , so it will be most endothermic and so on.
So trend is:
KF is most endothermic and KI being most exothermic.
Most exothermic
Kl
KBr
KCl
KF
Most endothermic
The size of ions in an ionic compound impacts internuclear distance and lattice energy, which in turn affect the compound's enthalpy of solution. Larger ions have less lattice energy, and are less exothermic when dissolved. In a comparison of KF, KI, KBr, and KCl, KF should be most exothermic and KI, most endothermic.
Explanation:In an ionic compound, the size of the ion influences the distance between the nuclei of adjacent ions, known as the internuclear distance. This relation affects the lattice energy, or the energy required to separate the ions in an ionic compound. Larger ions have a greater distance between them and thus have less lattice energy and are less exothermic when dissolved.
Given the compounds KF, KI, KBr, and KCl, their ion sizes (from fluorine to iodine) decrease moving across the periodic table. Therefore, KF should be the most exothermic and KI should be the most endothermic. Consequently, the sequence from most exothermic to most endothermic should be KF > KCl > KBr > KI.
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Carbon dioxide: is removed from the atmosphere by photosynthesis. comprises up to two percent of the atmospheric gases. is being removed from the atmosphere faster than it is being inputted. is not present in significant amounts in the atmosphere of Venus.
Answer:
Is removed from the atmosphere by photosynthesis.
Explanation:
The carbon dioxide (CO2) is presented in the atmosphere and its cycle began with it's incoming by respiration, combustion of fuels and decomposition. The autotrophs, which realize photosynthesis, use CO2 as fuel to produce their food with Sun rays.
The CO2 comprises about 0.3% of the atmospheric gases, and in the past few years, its input is being higher than its removal of the atmosphere, which is aggravating the greenhouse effect. Besides, the atmosphere of Venus has higher levels of CO2.
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A peptide bond Question
A. is a covalent bond between the functional R groups of adjacent amino acids.
B. is a covalent bond between the NH group of one polypeptide and the CO group of an adjacent polypeptide that holds together multimeric proteins.
C. is a covalent bond between the carboxyl carbon of one amino acid and the amino nitrogen of a second amino acid.
D. is a covalent bond between adjacent glucose molecules in a peptide. a noncovalent bond that dictates the tertiary structure of a protein.
Answer:
C. is a covalent bond between the carboxyl carbon of one amino acid and the amino nitrogen of a second amino acid.
A peptide bond is a covalent bond between the carboxyl carbon of one amino acid and the amino nitrogen of a second amino acid. Therefore, the correct option is option C.
What is peptide bond?A peptide bond, also known as a eupeptide bond, is a chemical connection produced by attaching one amino acid's carboxyl group towards the substituent of the other.
A peptide bond is a form of covalent chemical link that is amide in nature. A peptide bond is a covalent bond between the carboxyl carbon of one amino acid and the amino nitrogen of a second amino acid.
Therefore, a peptide bond is a covalent bond between the carboxyl carbon of one amino acid and the amino nitrogen of a second amino acid. The correct option is option C among all the given options.
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