Question 1

The average global temperature depends on all factors EXCEPT what?

Accepted Answer

A) the amount of incoming sunlight 
B) the amount of outgoing heat lost to space 
C) the amount of greenhouse gases 
D) the angle of the earth's surface in relation to the incoming sunlight 
E) All of the above are factors. 
A) the amount of incoming sunlight 
B) the amount of outgoing heat lost to space 
C) the amount of greenhouse gases 
D) the angle of the earth's surface in relation to the incoming sunlight 
E) All of the above are factors. D

Question 2

How many grams of water are needed to react with 27.2 grams of  
O?
Given: Li2O + H2O → 2 LiOH

Accepted Answer

A) 0.910 
B) 16.4 
C) 1.51 
D) 38.94 
E) none of the above 
A) 0.910 
B) 16.4 
C) 1.51 
D) 38.94 
E) none of the above B

Question 3

The actual yield is the amount of product actually produced by a chemical reaction.

Accepted Answer

A) True 
 B)False  True

Question 4

Many metals react with halogens to give metal halides.For example,
2 Al (s)+ 3 Cl2(g)→ 2 AlCl3 (s)
If you begin with 13.5 g of aluminum,

Accepted Answer

A) you will need 23.6 g Cl2 for complete reaction and will produce 66.7 g of AlCl3. 
B) you will need 53.2 g Cl2 for complete reaction and will produce 66.7 g of AlCl3. 
C) you will need 26.6 g Cl2 for complete reaction and will produce 49.0 g of AlCl3. 
D) you will need 11.8 g Cl2 for complete reaction and will produce 49.0 g of AlCl3. 
E) none of the above 
A) you will need 23.6 g Cl2 for complete reaction and will produce 66.7 g of AlCl3. 
B) you will need 53.2 g Cl2 for complete reaction and will produce 66.7 g of AlCl3. 
C) you will need 26.6 g Cl2 for complete reaction and will produce 49.0 g of AlCl3. 
D) you will need 11.8 g Cl2 for complete reaction and will produce 49.0 g of AlCl3. 
E) none of the above

Question 5

What is the limiting reactant for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)2?
Reaction: 2HCl + Ca(OH)2 → 2H2O + CaCl2

Accepted Answer

A) Ca(OH)2 
B) HCl 
C) H2O 
D) CaCl2 
E) not enough information 
A) Ca(OH)2 
B) HCl 
C) H2O 
D) CaCl2 
E) not enough information

Question 6

Suppose two chemical reactions are linked together in a way that the O2 produced in the first reaction goes on to react completely with Mg to form MgO in the second reaction.
Reaction one: 2 KClO3 → 3 O2 + 2 KCl
Reaction two: 2 Mg + O2 → 2 MgO
If you start with 4 moles of KClO3,how many moles of MgO could eventually form?

Accepted Answer

A) 2 moles 
B) 4 moles 
C) 6 moles 
D) 12 moles 
E) none of the above 
A) 2 moles 
B) 4 moles 
C) 6 moles 
D) 12 moles 
E) none of the above

Question 7

If 16.0 grams of aluminum oxide were actually produced,what is the percent yield of the reaction below given that you start with 10.0 g of Al and 19.0 grams of O2?
Reaction: 4Al + 3O2 → 2Al2O3

Accepted Answer

A) 75.0% 
B) 100% 
C) 84.7% 
D) 39.6% 
E) not enough information 
A) 75.0% 
B) 100% 
C) 84.7% 
D) 39.6% 
E) not enough information

Question 8

Which of the following is TRUE?

Accepted Answer

A) Stoichiometry shows the numerical relationship between chemical quantities in a balanced chemical equation. 
B) Stoichiometry allows prediction of the amounts of products that form in a chemical reaction based on the amounts of reactants. 
C) Stoichiometry allows prediction of how much of the reactants are necessary to form a given amount of product. 
D) All of the above are true. 
E) None of the above are true. 
A) Stoichiometry shows the numerical relationship between chemical quantities in a balanced chemical equation. 
B) Stoichiometry allows prediction of the amounts of products that form in a chemical reaction based on the amounts of reactants. 
C) Stoichiometry allows prediction of how much of the reactants are necessary to form a given amount of product. 
D) All of the above are true. 
E) None of the above are true.

Question 9

What is the theoretical yield of waffles if you have 5 cups of flour,9 eggs and 3 tbs of oil?
Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

Accepted Answer

A) 10 
B) 12 
C) 6 
D) 4 
E) not enough information 
A) 10 
B) 12 
C) 6 
D) 4 
E) not enough information

Question 10

In order to determine the limiting reactant in a particular reaction,one must know each of the following EXCEPT

Accepted Answer

A) the mass of each reactant present. 
B) the molar mass of each reactant present. 
C) the coefficient of each reactant in a balanced equation. 
D) the mass of each product formed. 
A) the mass of each reactant present. 
B) the molar mass of each reactant present. 
C) the coefficient of each reactant in a balanced equation. 
D) the mass of each product formed.

Question 11

Which is the excess reactant in the following reaction given that you start with 15.5 g of Na2S and 12.1 g CuSO4?
Reaction: Na2S + CuSO4 → Na2SO4 + CuS

Accepted Answer

A) Na2S 
B) CuSO4 
C) Na2SO4 
D) CuS 
E) not enough information 
A) Na2S 
B) CuSO4 
C) Na2SO4 
D) CuS 
E) not enough information

Question 12

How many moles of sodium metal are needed to make 3.6 moles of sodium chloride?
Given the reaction: 2Na + Cl2 → 2NaCl

Accepted Answer

A) 0.9 
B) 7.2 
C) 1.8 
D) 3.6 
E) not enough information 
A) 0.9 
B) 7.2 
C) 1.8 
D) 3.6 
E) not enough information

Question 13

How many grams of the excess reactant remain assuming the reaction goes to completion and that you start with 15.5 g of Na2S and 12.1 g CuSO4?
Reaction: Na2S + CuSO4 → Na2SO4 + CuS

Accepted Answer

A) 0.05 
B) 15.45 
C) 9.58 
D) 5.92 
E) not enough information 
A) 0.05 
B) 15.45 
C) 9.58 
D) 5.92 
E) not enough information

Question 14

When viewing a chemical equation,the limiting reactant can never be a chemical on the product side of the equation.

Accepted Answer

A) True 
 B)False

Question 15

The primary cause of increasing greenhouse gases is:

Accepted Answer

A) the burning of vast amounts of rain forests. 
B) the production of CO2 by respiration. 
C) the increased use of natural gas,petroleum and coal. 
D) the release of CO2 by decreasing solubility in the ocean. 
E) none of the above 
A) the burning of vast amounts of rain forests. 
B) the production of CO2 by respiration. 
C) the increased use of natural gas,petroleum and coal. 
D) the release of CO2 by decreasing solubility in the ocean. 
E) none of the above

Question 16

Which ingredient is the limiting reactant if you have 5 cups of flour,9 eggs and 3 tbs of oil?
Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

Accepted Answer

A) flour 
B) eggs 
C) oil 
D) waffles 
E) not enough information 
A) flour 
B) eggs 
C) oil 
D) waffles 
E) not enough information

Question 17

How many grams of sodium metal are needed to make 29.3 grams of sodium chloride?
Given the reaction: 2Na + Cl2 → 2NaCl

Accepted Answer

A) 46.0 
B) 5.75 
C) 23.0 
D) 11.5 
E) not enough information 
A) 46.0 
B) 5.75 
C) 23.0 
D) 11.5 
E) not enough information

Question 18

Global warming is due to the greenhouse gases preventing heat from Earth escaping into space.

Accepted Answer

A) True 
 B)False

Question 19

Stoichiometry is a chemist's version of following a recipe.

Accepted Answer

A) True 
 B)False

Question 20

How many moles of chlorine gas are needed to make 0.6 moles of sodium chloride?
Given the reaction: 2Na + Cl2 → 2NaCl

Accepted Answer

A) 0.6 
B) 0.3 
C) 1.2 
D) 3.6 
E) not enough information 
A) 0.6 
B) 0.3 
C) 1.2 
D) 3.6 
E) not enough information

The average global temperature depends on all factors EXCEPT what?

How many grams of water are needed to react with 27.2 grams of O? Given: Li₂O + H₂O → 2 LiOH

The actual yield is the amount of product actually produced by a chemical reaction.

Many metals react with halogens to give metal halides.For example, 2 Al (s)+ 3 Cl₂(g)→ 2 AlCl₃(s) If you begin with 13.5 g of aluminum,

What is the limiting reactant for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)₂? Reaction: 2HCl + Ca(OH)₂→ 2H₂O+ CaCl₂

If 16.0 grams of aluminum oxide were actually produced,what is the percent yield of the reaction below given that you start with 10.0 g of Al and 19.0 grams of O₂? Reaction: 4Al + 3O₂ → 2Al₂O₃

Which of the following is TRUE?

What is the theoretical yield of waffles if you have 5 cups of flour,9 eggs and 3 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

In order to determine the limiting reactant in a particular reaction,one must know each of the following EXCEPT

Which is the excess reactant in the following reaction given that you start with 15.5 g of Na₂S and 12.1 g CuSO₄? Reaction: Na₂S + CuSO₄→ Na₂SO₄ + CuS

How many moles of sodium metal are needed to make 3.6 moles of sodium chloride? Given the reaction: 2Na + Cl₂ → 2NaCl

How many grams of the excess reactant remain assuming the reaction goes to completion and that you start with 15.5 g of Na₂S and 12.1 g CuSO₄? Reaction: Na₂S + CuSO₄→ Na₂SO₄ + CuS

When viewing a chemical equation,the limiting reactant can never be a chemical on the product side of the equation.

The primary cause of increasing greenhouse gases is:

Which ingredient is the limiting reactant if you have 5 cups of flour,9 eggs and 3 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

How many grams of sodium metal are needed to make 29.3 grams of sodium chloride? Given the reaction: 2Na + Cl₂ → 2NaCl

Global warming is due to the greenhouse gases preventing heat from Earth escaping into space.

Stoichiometry is a chemist's version of following a recipe.

How many moles of chlorine gas are needed to make 0.6 moles of sodium chloride? Given the reaction: 2Na + Cl₂ → 2NaCl

The Chemical World

Measurement and Problem Solving

Matter and Energy

Atoms and Elements

Molecules and Compounds

Chemical Composition

Chemical Reactions

Electrons in Atoms and the Periodic Table

Chemical Bonding

Gases

Liquids,solids,and Intermolecular Forces

Solutions

Acids and Bases

Chemical Equilibrium

Oxidation and Reduction

Radioactivity and Nuclear Chemistry

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Exam 8: Quantities in Chemical Reactions

The average global temperature depends on all factors EXCEPT what?

How many grams of water are needed to react with 27.2 grams of O? Given: Li2O + H2O → 2 LiOH

The actual yield is the amount of product actually produced by a chemical reaction.

Many metals react with halogens to give metal halides.For example, 2 Al (s)+ 3 Cl2(g)→ 2 AlCl3 (s) If you begin with 13.5 g of aluminum,

What is the limiting reactant for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)2? Reaction: 2HCl + Ca(OH)2 → 2H2O + CaCl2

If 16.0 grams of aluminum oxide were actually produced,what is the percent yield of the reaction below given that you start with 10.0 g of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 → 2Al2O3

Which of the following is TRUE?

What is the theoretical yield of waffles if you have 5 cups of flour,9 eggs and 3 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

In order to determine the limiting reactant in a particular reaction,one must know each of the following EXCEPT

Which is the excess reactant in the following reaction given that you start with 15.5 g of Na2S and 12.1 g CuSO4? Reaction: Na2S + CuSO4 → Na2SO4 + CuS

How many moles of sodium metal are needed to make 3.6 moles of sodium chloride? Given the reaction: 2Na + Cl2 → 2NaCl

How many grams of the excess reactant remain assuming the reaction goes to completion and that you start with 15.5 g of Na2S and 12.1 g CuSO4? Reaction: Na2S + CuSO4 → Na2SO4 + CuS

When viewing a chemical equation,the limiting reactant can never be a chemical on the product side of the equation.

The primary cause of increasing greenhouse gases is:

Which ingredient is the limiting reactant if you have 5 cups of flour,9 eggs and 3 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

How many grams of sodium metal are needed to make 29.3 grams of sodium chloride? Given the reaction: 2Na + Cl2 → 2NaCl

Global warming is due to the greenhouse gases preventing heat from Earth escaping into space.

Stoichiometry is a chemist's version of following a recipe.

How many moles of chlorine gas are needed to make 0.6 moles of sodium chloride? Given the reaction: 2Na + Cl2 → 2NaCl

The Chemical World

Measurement and Problem Solving

Matter and Energy

Atoms and Elements

Molecules and Compounds

Chemical Composition

Chemical Reactions

Electrons in Atoms and the Periodic Table

Chemical Bonding

Gases

Liquids,solids,and Intermolecular Forces

Solutions

Acids and Bases

Chemical Equilibrium

Oxidation and Reduction

Radioactivity and Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

How many grams of water are needed to react with 27.2 grams of O? Given: Li₂O + H₂O → 2 LiOH

Many metals react with halogens to give metal halides.For example, 2 Al (s)+ 3 Cl₂(g)→ 2 AlCl₃(s) If you begin with 13.5 g of aluminum,

What is the limiting reactant for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)₂? Reaction: 2HCl + Ca(OH)₂→ 2H₂O+ CaCl₂

If 16.0 grams of aluminum oxide were actually produced,what is the percent yield of the reaction below given that you start with 10.0 g of Al and 19.0 grams of O₂? Reaction: 4Al + 3O₂ → 2Al₂O₃

Which is the excess reactant in the following reaction given that you start with 15.5 g of Na₂S and 12.1 g CuSO₄? Reaction: Na₂S + CuSO₄→ Na₂SO₄ + CuS

How many moles of sodium metal are needed to make 3.6 moles of sodium chloride? Given the reaction: 2Na + Cl₂ → 2NaCl

How many grams of the excess reactant remain assuming the reaction goes to completion and that you start with 15.5 g of Na₂S and 12.1 g CuSO₄? Reaction: Na₂S + CuSO₄→ Na₂SO₄ + CuS

How many grams of sodium metal are needed to make 29.3 grams of sodium chloride? Given the reaction: 2Na + Cl₂ → 2NaCl

How many moles of chlorine gas are needed to make 0.6 moles of sodium chloride? Given the reaction: 2Na + Cl₂ → 2NaCl