Answer:
The answers are either 1 or 4
Explanation:
I am pretty dure it is 1
If two objects A and B of same temperature are in contact with each other, there will be no transfer of heat. Hence, option A is true.
Heat TransferHeat is the transfer of energy from one object to another, for this transfer it is necessary that there is difference between the temperature of the objects.
In this question the objects A and B of the same temperature are in contact with each other, and the law of transfer of heat energy says without temperature difference there will be no heat transfer, hence the option A which says "Although the molecules collide, no heat transfers because there is no temperature difference between the objects" is correct.
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Which describes the way a convection current moves? A in a spiral B in a line C in a loop
Answer:
C a loop
Explanation:
Answer:
I think its C
Explanation:
H2CO3 --> CO2 + H20 is what kind of reaction
Answer: Carbon dioxide react with water to produce carbonic acid
so it is a combustion reaction
Explanation: pls mark as brainliest
What does molarity tell us that percent solution information does not tell us?
Answer:
Molarity tell us about the concentration of moles of solute in a solution.
Explanation:
Chemical substances are measured in terms of mole. Mole is defined as the amount of substance which contains 6.022×10²³ particles, ions or atoms. In System of international, amount of substance is measured in moles. So molarity tells us more information about amount of solute in a solution as compared to percent solution.
Answer:
Molarity tell us about the concentration of moles of solute in a solution.
Explanation:
.
What is the Molarity of the Chloride ion (Cl-) in a 5M AlCl3 solution?
Answer: The Molarity of the Chloride ion in a 5M [tex]AlCl_3[/tex] solution is 15 M
Explanation:
Molarity is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
n= moles of solute
[tex]V_s[/tex] = volume of solution in ml
[tex]AlCl_3\rightarrow Al^{3+}+3Cl^-[/tex]
Now as 1 mole of [tex]AlCl_3[/tex] gives 3 moles of [tex]Cl^-[/tex]
5 moles of [tex]AlCl_3[/tex] gives =[tex]\frac{3}{1}\times 5=15[/tex] moles of [tex]Cl^-[/tex]
Thus Molarity of the Chloride ion in a 5M [tex]AlCl_3[/tex] solution is 15 M
Caculate the pH of a solution that has a hydrogen ion concentration of 0.0025
Answer:
The pH of the solution is 2.60.
Explanation:
The pH gives us an idea of the acidity or basicity of a solution. More precisely, it indicates the concentration of H30 + ions present in said solution. The pH scale ranges from 0 to 14: from 0 to 7 corresponds to acid solutions, 7 neutral solutions and between 7 and 14 basic solutions. It is calculated as:
pH = -log (H30 +)
pH= -log (0,0025)
pH=2.60
And atom that has fewer neutrons and protons and more electrons than protons is a what ion
Hey there!
The two types of ions are anions and cations.
Anions are negative and cations are positive (cheesy, but CAT-ions are PAWS-itive helps me remember).
If there are more electrons than protons, then the negative charge will be higher than the positive charge. So, the ion will overall be negative.
This means the atom is an anion.
Hope this helps!
Determine the mass of NaOH needed to make 750.0mL of a 6.00 M solution of NaOH
Answer: 180g
Explanation:
No of moles= volume ×molarity/1000
Volume is given as 750ml
Molarity is given as 6M
Substitute to get the mole
No of moles = 750×6/1000
No of moles= 4.5moles
Remember that
No of moles also = mass given/molar mass
Molar mass of NaOH
Na= 23
O=16
H=1
Molar mass = na +o+h
Molar mass =23+16+1
Molar mass=40g/mol
Substitute
No of moles = mass given/molar mass
Mass = 4.5×40
Mass = 180g
The mass of NaOH needed is 180g
If I have 7.5 L of a gas in a piston at a pressure of 1.75 atm and compress the gas until its volume is 3.7 L, what will the new pressure inside the
piston be?
Answer:
3.55atm
Explanation:
We will apply Boyle's law formula in solving this problem.
P1V1 = P2V2
And with values given in the question
P1=initial pressure of gas = 1.75atm
V1=initial volume of gas =7.5L
P2=final pressure of gas inside new piston in atm
V2=final volume of gas = 3.7L
We need to find the final pressure
From the equation, P1V1 = P2V2,
We make P2 subject
P2 = (P1V1) / V2
P2 = (1.75×7.5)/3.7
P2=3.55atm
Therefore, the new pressure inside the piston is 3.55atm
What would Earth's surface look like if there were no movement of tectonic plates? Explain your answer.
Answer: Earths surface wouldn't have mountains for an example there wouldn't be any if it wasn't for divergent plate boundary
Explanation:
name the following hydrocarbons
Answer:
1) 3-methylpentane 2)Butyne
Explanation:
On the first molecule, we have a methyl group on the 3rd carbon, so you will have "3-methhyl". It's a 5 carbon molecule with no double bonds, so "-pentane" is required.
On the second molecule, we have a simple 4 carbon molecule with a triple bond which makes it an Alkyne. 4 carbons makes the prefix "but-" and a alkyne males the ending "-yne".
which of these questions could a testable hypothesis be developed?
Answer:
Explanation:
Does the width of a rubber band affect how far it will stretch?
How does the thickness of a material affect insulation?
Do all objects fall to the ground at the same speed?
Answer:
sorry can you please add the questions
Explanation:
but to identify an hypothesis is when before the experiment you are gonna put what you think might happen
How many grams of O2 are needed to react with 13.6 g of NH3
Answer:
Mass = 32 g
Explanation:
Given data:
Mass of O₂ needed = ?
Mass of NH₃ react = 13.6 g
Solution:
Chemical equation:
4NH₃ + 5O₂ → 4NO + 6H₂O
Number of moles of ammonia:
Number of moles = mass/ molar mass
Number of moles = 13.6 g/ 17 g/mol
Number of moles = 0.8 mol
Now we will compare the moles of ammonia and oxygen from balance chemical equation.
NH₃ : O₂
4 : 5
0.8 : 5/4×0.8 = 1
Mass of oxygen:
Mass = number of moles × molar mass
Mass = 1 mol × 32 g/mol
Mass = 32 g
Final answer:
To react 13.6 grams of NH₃ completely, one needs 32 grams of O₂ based on the balanced chemical equation and stoichiometric calculations.
Explanation:
To determine how many grams of O₂ are needed to react with 13.6 g of NH₃, we need to follow stoichiometric principles based on the balanced chemical equation. The reaction 4NH₃ (g) + 5O₂ (g) → 4NO (g) + 6H₂O (l) indicates that 4 moles of NH₃ react with 5 moles of O₂.
Firstly, we calculate the number of moles of NH3 we have:
Using the molar mass of NH₃ (17 g/mol), we find that 13.6 g NH₃ equals 0.8 moles NH₃ (13.6 g ÷ 17 g/mol).From the balanced equation, the molar ratio of NH₃ to O₂ is 4:5. Thus, 0.8 moles of NH₃ would require 1 mole of O₂ (0.8 moles NH₃ × (5/4)).Finally, we calculate the mass of O₂ needed by using its molar mass (32 g/mol). The mass of O₂ for 1 mole is 32 g (1 mole × 32 g/mol).Therefore, 13.6 grams of NH₃ require 32 grams of O₂ to react completely according to the given chemical equation.
what happens to entropy during this dissolving process.
Answer:
The process of dissolving increases entropy because the solute particles become separated from one another when a solution is formed.
Calculate the pH of a solution prepared by mixing 25.00 mL of 0.155 M Ca(OH)2
solution with 35.00 mL of 0.112 M HCl solution
Answer:
pH of solution is: 12.82
Explanation:
The reaction of hydrochloric acid with calcium hydroxide is:
Ca(OH)₂ + 2 HCl → H₂O + CaCl₂
Where 2 moles of hydrochloric acid react with 1 mole of calcium hydroxide
Moles of HCl and moles of Ca(OH)₂ are:
Moles HCl:
0.02500L × (0.155mol / L) = 3.875x10⁻³moles HCl
Moles of Ca(OH)₂:
0.03500L × (0.112mol / L) = 3.92x10⁻³moles Ca(OH)₂
Moles of Ca(OH)₂ that react are:
3.875x10⁻³moles HCl × (1 mol Ca(OH)₂ / 2 mol HCl) = 1.9375x10⁻³ mol Ca(OH)₂
Thus, moles of Ca(OH)₂ that remain are:
3.92x10⁻³moles Ca(OH)₂ - 1.9375x10⁻³ mol Ca(OH)₂ = 1.9825x10⁻³ mol Ca(OH)₂
Moles of OH⁻ are:
1.9825x10⁻³ mol Ca(OH)₂ × (2mol OH⁻ / 1mol Ca(OH)₂) = 3.965x10⁻³ mol OH⁻
As volume is 25mL + 35mL = 60mL ≡ 0.060L. Molar concentration of OH⁻ is:
3.965x10⁻³ mol OH⁻ / 0.060L = 0.066M OH⁻.
pOH = -log [OH⁻]
pOH = 1.18
pH = 14-pOH
pH of solution is: 12.82
Answer:
pH = 12.80
Explanation:
Step 1: data given
Volume of a 0.155 M Ca(OH)2 = 25.00 mL = 0.025 L
Volume of a 0.112 M HCl = 35.00 mL = 0.035 L
Step 2: The balanced equation
Ca(OH)2 + 2HCl → CaCl2 + 2H2O
Step 3: Calculate moles
Moles = molarity * volume
Moles Ca(OH)2 = 0.155M * 0.025 L
Moles Ca(OH)2 = 0.003875 moles
Moles HCl = 0.112 M * 0.035 L
Moles HCl = 0.00392 moles
Step 4: Calculate the limiting reactant
For 1 mol Ca(OH)2 we need 2 moles HCl to produce 1 mol CaCl2 and 2 moles H2O
HCl is the limiting reactant. It will completely be consumed. (0.00392 moles) Ca(OH)2 is in excess. There will react 0.00392 / 2 = 0.00196 moles
There will remain 0.003875 - 0.00196 = 0.001915 moles Ca(OH)2
Step 5: Calculate molarity of Ca(OH)2
Molarity = moles / volume
Molarity Ca(OH)2 = 0.001915 moles / (0.060 L)
Molarity Ca(OH)2 = 0.0319 M
For 1 mol Ca(OH)2 we have 2 moles OH-
Molarity of OH- = 2*0.0319 = 0.0638 M
Step 6: Calculate pH
Since Ca(OH)2 is a strong base
The ph will be the pH of a strong base
pOH = -log[0.0638)
pOH = 1.20
pH = 14 -1.20 = 12.80
what evidence caused bohr to change rutherfords nuclear model into the solar system model
Both noticed that different atoms gives different colours of light when they are exposed to flame.
How do the processes of weathering, erosion, and deposition affect the ecoregions of Texas? Give a specific example of how each process affects a particular ecoregion.
Answer:
Answer is explained below in the explanation section.
Explanation:
In this whole planet, there are three main determinants which determine the shape, topography and soil features on the surface of Earth. Which are as follows:
1. Weathering
2. Erosion
3. Deposition
All three processes occur simultaneously irrespective of any dependence. In addition, due to weathering, erosion and deposition together affects the land and particular supportive ecosystem.
Likewise in Texas, due to these processes, it has form ten different landforms or eco-regions.
For instance, take weathering into account and its effect on ecoregions of Texas.
In summer, we have hot weather, it means precipitation of water or transition of wet to dry. Windy weather accompanied with erosion cut the mountains and rocks and builds a particular topography suitable for a particular ecosystem. Furthermore, if there are no plants or bushes and soil is exposed to water and wind then erosion is very easy to take place.
So, water, temperature, wind, rivers are extremely powerful agents for weathering , erosion and deposition.
Final answer:
Weathering, erosion, and deposition collectively influence Texas's ecoregions by shaping landscapes, such as creating caves in the Hill Country, forming desert pavement in West Texas, and enriching soils along the Gulf Coast.
Explanation:
The physical processes of weathering, erosion, and deposition play significant roles in shaping the ecoregions of Texas. Weathering breaks down rocks and minerals into smaller pieces through mechanical and chemical processes. For example, the limestone of the Texas Hill Country undergoes chemical weathering through the acidic rainwater, creating characteristic features such as caves and sinkholes.
Erosion is the process by which weathered material is moved from one location to another. In the arid regions of West Texas, eolian erosion by wind can lead to the formation of desert pavement, where fine particles are blown away, leaving a layer of larger rocks. This protects the soil underneath from further erosion.
Finally, deposition is when eroded materials are laid down in new locations. Along the Gulf Coast of Texas, river sediments are deposited, building up the coastal plains and contributing to the growth of deltas. Here, deposition leads to nutrient-rich soils that support diverse ecosystems and human agriculture.
At what temperature will 2.40 moles of chlorine gas exert a pressure of 2.70 atm at a volume of 0.750 L?
Answer:
—262.71°C
Explanation:
Step 1:
The following data were obtained from the question:
Number of mole (n) = 2.4 moles
Pressure (P) = 2.70 atm
Volume (V) = 0.750 L
Temperature (T) =?
Gas constant (R) = 0.082atm.L/Kmol
Step 2:
Determination of the temperature.
Using the ideal gas equation, the temperature can be obtained as follow:
PV = nRT
2.7 x 0.750 = 2.4 x 0.082 x T
Divide both side by 2.4 x 0.082
T = (2.7 x 0.750) /(2.4 x 0.082)
T = 10.29K
Step 3:
Conversion of Kelvin temperature to celsius temperature.
Temperature (celsius) = temperature (Kelvin) - 273
temperature (Kelvin) = 10.29K
Temperature (celsius) = 10.29 - 273
Temperature (celsius) = —262.71°C
Answer:
10.28Kelvin
Explanation:
Using the ideal gas equation;
PV = nRT
P is the pressure
V is the volume of the gas
n is the number of moles
T is the temperature in Kelvin
R is the Gas constant
Given n = 2.4moles
P = 2.70atm
V = 0.750L
R = 0.0821atm.L/mol.K
From the formula above:
T = PV/nR
T = 2.70×0.750/2.4×0.0821
T = 2.025/0.197
T = 10.28K
1. Compare the properties of the strong force to the
properties of the electromagnetic force.
Answer:
The strong force is very strong, always attractive, and very short-ranged. The electromagnetic force is much weaker, can be attractive or repulsive, and can operate over large distances.
Explanation:
The electromagnetic force between two charges increases with increase in magnitude of the charges and decreases with increase in distance between the charges.
The force between two charges is determined by Coulomb's law, which states that the force of attraction or repulsion between two charges is directly proportional to the product of the charges and inversely proportional to the square of distance between the two charges.
Electromagnetic force between two charges is calculated as follows;
[tex]F = \frac{kq_1q_2}{r^2}[/tex]
where;
r is the distance between the two chargesq₁ and q₂ are the two chargesThus, the electromagnetic force between two charges increases with increase in magnitude of the charges and decreases with increase in distance between the charges.
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If you have 8.46x10^24 atoms of calcium, how many grams of calcium do you have?
Answer:
562g
Explanation:
Molar mass of Ca = 40g/mol
1 mol gives 6.02×10^23 atoms
Xmol of Ca gives 8.46×10^24 atoms
X= 14.05 mol
No of mol= mass/molar mass
Mass = 40 ×14.05 = 562g.
Which of the following statements best predicts the pH value of H2CO3 and KOH?
Both have a pH less than 7, but H2CO3 has a higher pH than KOH.
Both have a pH greater than 7, but H2CO3 has a lower pH than KOH.
H2CO3 has a pH less than 7, and KOH has a pH greater than 7.
H2CO3 has a pH greater than 7, and KOH has a pH less than 7.
Answer:
The 2nd one
Explanation:
ITS THE RIGHT ANSWER
Acids and bases can be measured using a pH scale. The scale has a range of 0 to 14. An indicator called Litmus paper is used to determine if a chemical is an acid or a basic. Here H₂CO₃ is an acid and its pH is less than 7 whereas KOH is a base whose pH is more than 7. The correct option is C.
The H⁺ ion concentration's negative logarithm is known as pH. As a result, the meaning of pH is justified as the strength of hydrogen. In most cases, the strength of acids and bases is quantified using their pH values.
The activity of the hydrogen atoms determines the pH level since this activity is a reliable predictor of the acidity or alkalinity of the water. The pH scale has a range of 0 to 14, with 7.0 being neutral.
Thus the correct option is C.
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2. How far can you push a sled if you exert a force of 7 N in the same direction and the amount of work you did was 56 J?
Answer:
8 m
Explanation:
by using well known formula
[tex]s=\frac{W}{F}=\frac{56}{7}=8[/tex]
To determine the distance a sled can be pushed with 7 N of force and 56 J of work done, you divide the work by the force, which yields a distance of 8 meters.
To find out how far you can push a sled by applying a force of 7 N, which resulted in 56 J of work, you use the work formula:
Work (W) = Force (F) x Distance (d)In the above, W = 56 J and F = 7 N. To find the distance (d), you rearrange the formula to solve for d:
d = W / FNow plug in the values:
d = 56 J / 7 N = 8 metersTherefore, you can push the sled 8 meters by exerting a force of 7 N if the amount of work done was 56 J.
Given the equation:
H+ + OH- -- H:0
Which type of reaction does the equation epresent?
Answer:
The equation represents a neutralization reaction.
What is the % yield if 17.4g of sodium hydroxide is produced when 20.0g of sodium metal reacts with 19g of water according to the chemical equation 2Na(s) + 2H₂O(l) → 2NaOH(aq)+ H₂(g)?
50.05% is the percent yield if 17.4g of sodium hydroxide is produced when 20.0g of sodium metal reacts with 19g of water.
Explanation:
Balanced chemical equation for the reaction:
2Na + 2 [tex]H_{2}[/tex]O ⇒ 2NaOH + [tex]H_{2}[/tex]
Data given:
mass of NaOH produced = 17.4 grams
mass of Na reacted = 20 grams
mass of water reacted = 19 grams
percent yield =?
atomic mass of Na = 23 grams/mole
atomic mass of water = 18 grams/mole
atomic mass of NaOH = 39.9 grams/mole
number of moles is calculated as:
number of moles = [tex]\frac{mass}{atomic mass of 1 mole}[/tex]
putting the values in above equation to know number of moles:
number of moles of Na = [tex]\frac{20}{23}[/tex]
= 0.869 moles
number of moles of water = [tex]\frac{19}{18}[/tex]
= 1.05 mole
number of moles of NaOH = [tex]\frac{17.4}{40}[/tex]
= 0.435 moles
limiting reagent in the reaction is Na
2 moles of Na reacted to give 2 moles of NaOH
So, 0.869 moles of NaOH will give 0.869 moles of NaOH
Grams of NaOH = 34.76 grams (theoretical yield)
2 moles of water will give 2 moles of NaOH
Hence, 1.05 moles will give 1.05 moles of NaOH
grams of NaOH = 42 grams
percent yield = [tex]\frac{actual yield}{theoretical yield}[/tex]
putting the values in the equation:
percent yield = [tex]\frac{17.4}{34.76}[/tex] x100
= 50.05 %
50.05 % is the percent yield.
what did you include in your response? check all that apply.
Answer:
click all of the boxes
Explanation:
Which one of the following is a common acid? A. Antacid
B. Wasking soda
C. Aspirin
D. Soap
FOLLOW ME FOR CLEARING YOUR NEXT DOUBT
Answer:
C. Aspirin
Explanation:
If you are using A pex, this is the correct answer.
Reasoning: Soap is not an acid so thats out of the question. I'm not sure if washing soda or antacid are acidic but even if they were, Aspirin is definitely an acid and is way more commonly used than those two.
Which atom is involved in giving your heart energy to beat
Answer:
I think it is oxygen
Hope it helps :)
700 grams of glucose reacted fully with oxygen
How many moles of gas will be created
Answer:
23.34mole of CO2
Explanation:
C6H12O6 + 6O2 => 6CO2 + 6H20
Molar mass of C6H12O6 = 180g/Mol
No of mole of C6H12O6 = 3.89mol
1 mol of C6H12O6 gives 6mole of CO2
3.89mol of C6H12O6 gives X mole of CO2
X = 3.89×6 = 23.34mole
Why are atoms attracted to eachother in an ionic bond
Answer:
There is a transfer of electrons between the two atoms which creates a strong bond
Explanation:
Typically these bonds result between a metal and a nonmetal which transfer electrons, because of the transfer of electrons and opposite sigsn (+/-) between the atoms in an ionic bond they tend to form quite a strong attraction to eachother. Look up coulombic attraction for more understanding!
A sample of argon has a volume of 0.165L at -34.0°C and a 0.98atm of pressure. What would the volume of this gas at STP be?
Answer: 0.185 L
Explanation:
Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 0.98 atm
[tex]P_2[/tex] = final pressure of gas = 1 atm (at STP)
[tex]V_1[/tex] = initial volume of gas = 0.165 L
[tex]V_2[/tex] = final volume of gas = ?
[tex]T_1[/tex] = initial temperature of gas = [tex]-34.0^oC=273-34.0=239.0K[/tex]
[tex]T_2[/tex] = final temperature of gas = [tex]273K[/tex] (at STP)
Now put all the given values in the above equation, we get:
[tex]\frac{0.98\times 0.165}{239}=\frac{1\times V_2}{273}[/tex]
[tex]V_2=0.185l[/tex]
Thus the volume of this gas at STP be 0.185 L
How many moles are in 4.3 x 1022 molecules of H 3 PO 4 ?
Answer:
0.071 mole
Explanation:
As discovered from Avogadro's hypothesis, 1 mole of any substance contains 6.02x10^23 molecules.
This simply means that 1 mole of H3PO4 also contains 6.02x10^23 molecules.
If 1 mole H3PO4 contains 6.02x10^23 molecules,
Then, xmol of H3PO4 will contain 4.3x10^22 molecules i.e
Xmol of H3PO4 = 4.3x10^22/6.02x10^23 = 0.071 mole
From the calculations made above, 4.3x10^22 molecules of H3PO4 have 0.071 mole of H3PO4
Using Avogadro's number, you can find there are approximately 0.71 moles in 4.3 x [tex]10^{22}[/tex] molecules of H3PO4.
Explanation:To find out how many moles are in 4.3 x [tex]10^{22}[/tex] molecules of H 3 PO 4, you want to use Avogadro's number, which is 6.022 x [tex]10^{23}[/tex] molecules per mole. To find the number of moles:
Number of moles = (Number of molecules) / (Avogadro's constant)
4.3 x [tex]10^{22}[/tex] molecules H3PO4 / (6.022 x [tex]10^{23}[/tex] molecules/mole) = 0.71 moles H3PO4.
So, there are approximately 0.071 moles in 4.3 x[tex]10^{22}[/tex] molecules of H3PO4.
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