Answer:
percentage of water = 18.76%
Explanation:
A chemist has a sample of hydrated Li2SiF6 and it weighs 0.4813 grams.
The overall weight of the compound is 0.4813 grams.
weight of hydrated sample = 0.4813 grams.
weight of anhydrous compound = 0.391 grams
percentage weight of water = mass of water/mass of the hydrated compound × 100
mass of water = mass of hydrated compound - mass of anhydrous compound
mass of water = 0.4813 - 0.391 = 0.0903 grams.
percentage of water = 0.0903/0.4813 × 100
percentage of water = 9.03/0.4813
percentage of water = 18.761687097
percentage of water = 18.76%
Answer:
18.8%
Explanation:
Step 1:
The following data were obtained from the question.
Mass of hydrated Li2SiF6 = 0.4813 g
Mass of anhydrous Li2SiF6 = 0.391 g
Step 2:
Determination of the mass of the water in the hydrate.
Mass of water = (Mass of hydrated Li2SiF6) - (Mass of anhydrous Li2SiF6)
Mass of water = 0.4813 - 0.391
Mass of water = 0.0903 g
Step 3:
Determination of the percentage of water in the hydrate.
The percentage of water = Mass of water/ mass of hydrate x 100
The percentage of water = 0.0903/0.4813 x 100
The percentage of water = 18.8%
Why has Earth's climate changed so rapidly in recent years?
(a)The sun has gotten much hotter.
(b)People are eating too many plants.
(c) People are burning too many fossil fuels.
(D) The Earth is rotating too slowly to cool off effectively
Final answer:
The rapid change in Earth's climate is primarily due to the burning of fossil fuels, which has led to increased greenhouse gas emissions and trapped more solar radiation in our atmosphere. Seventeen of the warmest years on record have occurred since 2000, highlighting the swift pace of climate change due to human activities.
Explanation:
The Earth's climate has undergone rapid changes in recent years, largely due to human activities rather than natural climatic variations. The most significant factor causing this rapid climate change is the burning of fossil fuels, leading to increased levels of greenhouse gases, such as carbon dioxide, in the atmosphere. This human-induced acceleration of climate change is clearly demonstrated by the fact that we have witnessed 17 of the 18 warmest years on record since the year 2000. Option C
Fossil fuels burned for energy during and after the Industrial Revolution have allowed advances in public health, food production, and urbanization. However, this has come at the expense of our environment. The greenhouse gas emissions trap solar infrared radiation, leading to a warming effect. This anthropogenic warming disturbs ecological relationships and has manifold influences on global temperatures, precipitation patterns, polar ice melting, sea levels, and biodiversity.
While natural factors such as volcanic activity, changes in the sun's intensity, and Earth's orbital shifts do contribute to climate variability, the unprecedented rate of current global warming is predominantly tied to human activity. This underscores the urgent need for mitigating greenhouse gas emissions to prevent further environmental degradation.
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.
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".
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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TRUE or FALSE: Volcanoes help warm the planet by releasing CO2 (carbon dioxide)
Answer: TRUE
Explanation: I’d say it is true because lava comes out of volcanos and lava is obviously VERY hot so it must help warm the planet by realizing carbon dioxide.
The ability to react with oxygen is a physical property.
True
False
Answer:
True.
Explanation:
If no modification is there, such as in melting, the property or change is termed physical. In comparison, chemical properties or changes involve changes in the composition of the substance. The ability to react with oxygen is a chemical property
The ability to react with oxygen is a physical property. - False
Explanation:Chemical properties are characteristics of a substance that describe how it interacts with other substances or undergoes chemical reactions. These properties include reactivity, flammability, acidity or alkalinity (pH), and the ability to form chemical bonds. Chemical properties help identify and classify substances based on their behavior in chemical processes.
The ability to react with oxygen is a chemical property, not a physical property. Chemical properties describe how a substance interacts with other substances and undergoes chemical changes. Reacting with oxygen involves a chemical change where a substance combines with oxygen to form new compounds or undergoes oxidation.
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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
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 is always true of a weak base
Answer: Some of the original base remains in the solution.
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
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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is ionic compounds are compounds of two or more anions
Answer:
ionic compounds contain both types of ions,like postie or negative
Explanation:
How many grams of sodium nitrate (NaNO2) will dissolve in 100g of water at 20°C?
Answer:
82 grams of sodium nitrate (NaNO2) will dissolve in 100 grams of water at 20°C.
Explanation:
90.0 grams of sodium nitrate (NaNO2) will dissolve in 100g of water at 20°C.
To determine the grams of sodium nitrate (NaNO2) that will dissolve in 100g of water at 20°C, we can use the solubility data for NaNO2 at that temperature.
According to the solubility data:
- Solubility of NaNO2 in water at 20°C = 90.0 g/100 g water
This means that 100g of water can dissolve 90.0g of NaNO2 at 20°C.
So, if we have 100g of water, the maximum amount of NaNO2 that can dissolve in it is 90.0g.
Therefore, 90.0 grams of sodium nitrate (NaNO2) will dissolve in 100g of water at 20°C.
Which of the following is closest to the meaning of the term ancestor?
A. a relative from long ago
B. an organism that has evolved
C. a trait that has changed over time
D. an organism that is adapted to its environment
Answer:
I would say A
Explanation:
our ancestors are the people that lived long before us
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 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.
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
what is the difference between speed, velocity,acceleration.
Answer:
Velocity is the rate of change of displacement( change of distance in a particular direction with respect to time) , and acceleration is the rate of change of velocity per unit of time. ... Also, speed is a scalar quantity but velocity and acceleration are vector quantities.
Explanation:
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!
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:
How do the isotopes hydrogen-2 (deuterium) and hydrogen-3 (tritium) differ?
A. deuterium has one more electron than tritium
B. tritium has one more neutron than deuterium
C. deuterium has two protons
D. there is no difference because it is the exact same atom.
The isotopes hydrogen-2 (deuterium) and hydrogen-3 (tritium) differ in the number of neutrons in their nuclei. Option B is the answer.
Explanation:The isotopes hydrogen-2 (deuterium) and hydrogen-3 (tritium) have different numbers of neutrons in their nuclei. Deuterium has one more neutron than hydrogen-1, while tritium has two more neutrons than hydrogen-1. The difference in the number of neutrons gives these isotopes different properties and behaviors.
Option B is the correct answer: tritium has one more neutron than deuterium. The number of electrons and protons in isotopes of an element remains the same, so options A and C are incorrect. Option D is also incorrect because deuterium and tritium are different isotopes of hydrogen with different numbers of neutrons.
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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.
The particles of a liquid, such as water, are more able to move around than the particles of a solid, such as foil. Water particles with more heat move to areas where there are water particles with less heat. In other words, convection allows heat to be transferred from warmer places to cooler places.
Complete the sentences to describe the convection experiment.
Answer:
2, 3, and 1
Explanation:
red water in hot water
rose to the top of the beaker
warmer than
The red water in hot water model showed convection. In the convection model, the red water on the bottom of the beaker rose to the top of the beaker. This means that the water at the bottom of the beaker was warmer than the water near the top of the beaker.
What is convection?Convection is the transfer of heat from one place to another due to the movement of fluid. Although often discussed as a distinct method of heat transfer, convective heat transfer involves the combined processes of conduction (heat diffusion) and advection. Convection is usually the dominant form of heat transfer in liquids and gases.
Note that this definition of convection is only applicable in Heat transfer and thermodynamic contexts. It should not to be confused with the dynamic fluid phenomenon of convection, which is typically referred to as Natural Convection in thermodynamic contexts in order to distinguish the two.
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Your question is incomplete, but most probably your full question was,The particles of a liquid, such as water, are more able to move around than the particles of a solid, such as foil. Water particles with more heat move to areas where there are water particles with less heat. In other words, convection allows heat to be transferred from warmer places to cooler places. Complete the sentences to describe the convection experiment The model showed convection. In the convection model, the red water on the bottom of the beaker This means that the water at the bottom of the beaker was the water near the top of the beaker.
A solution has 3 mol of sodium dissolved into 500mL of solution. What is the molarity of the solution?
Answer:
6M
Explanation:
No of mole = concentrate × volume
n= c × V
C= n/V
V=500mL=0.5L
C= 3/0.5=6M
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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Given the equation:
H+ + OH- -- H:0
Which type of reaction does the equation epresent?
Answer:
The equation represents a neutralization reaction.
IN A TEST! NEED HELP
Compare the atomic radii of sodium and chlorine. Based on their positions in the periodic table,
A.) sodium has a larger radius because it is in column 1.
B.) sodium has a smaller radius because it is in column 1.
C.)chlorine has a larger radius because it is in column 17.
D.) their radii are equal because they are in the same period.
The sodium has a larger atomic radius than chlorine because it is in column 1. Therefore, option (A) is correct.
What is an atomic radius?Atomic radius can be defined as half of the distance between two adjacent atoms of the same chemical element in a molecule. The atomic radius of chemical elements is of the order of 1.2 x 10⁻¹⁰ m.
The electron cloud around the nucleus acts as the atom's shell. It does not have a fixed shape which makes it difficult to determine the atomic size.
The atomic radius of sodium is larger than that of chlorine. As both Na and Cl belong to the 3rd period, so the atomic size generally decreases across the period as we move from left to right.
The sodium is placed in column 1 while chlorine is placed in column 17. The effective nuclear charge will increase as the atomic number increases. With increased effective nuclear charge electronegativity of the nucleus increases which results in the increased attraction of electrons to the nucleus.
Therefore, the atomic radius of sodium is larger than that of chlorine.
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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.