Question 1

When 15 mL of ethanol is mixed with 55 mL of water,ethanol is the solute.

Accepted Answer

A) True 
 B)False

Question 2

The mass percent of a solution that has 0.50 mol of NaOH in 100 g of solution is 5.0%.

Accepted Answer

A) True 
 B)False

Question 3

Molarity is a measure of

Accepted Answer

A) the volume of a solution. 
B) the mass of a substance. 
C) the ability of a substance to ionize. 
D) the concentration of a solute in a solution. 
A) the volume of a solution. 
B) the mass of a substance. 
C) the ability of a substance to ionize. 
D) the concentration of a solute in a solution.

Question 4

An addition reaction will have a higher percent atom economy than a substitution reaction.

Accepted Answer

A) True 
 B)False

Question 5

How many liters of a 0.2 M HCl solution are needed in order to have 1.0 moles of HCl?

Accepted Answer

A) 0)2 L 
B) 0)8 L 
C) 5 L 
D) 8 L 
A) 0)2 L 
B) 0)8 L 
C) 5 L 
D) 8 L

Question 6

A solution that is 1% by mass contains

Accepted Answer

A) 3 g of solute in 3 kg of solution. 
B) 1 g of solute in 100 g of solution. 
C) 3 mL of solute in 300 mL of solution. 
D) 2 mole of solute in 2 L of solution. 
A) 3 g of solute in 3 kg of solution. 
B) 1 g of solute in 100 g of solution. 
C) 3 mL of solute in 300 mL of solution. 
D) 2 mole of solute in 2 L of solution.

Question 7

The following reaction is important in the removal of sulfur dioxide,a major source of acid rain,from the smokestacks of coal burning power plants.When the equation below is balanced,the coefficient of oxygen is:
CaO + SO₂ + O₂ → CaSO₄

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 8

In order for the law of combining volumes to apply,all of the following must be the same for all reactants EXCEPT

Accepted Answer

A) the pressure must be the same. 
B) the reactants must be liquids. 
C) the temperature must be the same. 
D) all reactants must be gases. 
A) the pressure must be the same. 
B) the reactants must be liquids. 
C) the temperature must be the same. 
D) all reactants must be gases.

Question 9

Joseph Priestley discovered oxygen in 1774 by heating mercury(II)oxide.The compound decomposes into its elements.How much oxygen,O₂,is produced by the decomposition of 25 g of HgO?

Accepted Answer

A) 1)8 g 
B) 3)7 g 
C) 5)5 g 
D) none of these 
A) 1)8 g 
B) 3)7 g 
C) 5)5 g 
D) none of these

Question 10

The stoichiometric factor relates the moles of any two substances in a balanced chemical reaction.

Accepted Answer

A) True 
 B)False

Question 11

When the equation below is balanced,the coefficient of sodium cyanide is:
NaCN + H₂SO₄ → Na₂SO₄ + HCN

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 12

The following reaction is important in the removal of sulfur dioxide,a major source of acid rain,from the smokestacks of coal burning power plants.When the equation below is balanced,the coefficient of calcium oxide (commonly called "lime")is:
CaO + SO₂ + O₂ → CaSO₄

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 13

Balance the equation: Fe + O₂ → Fe₂O₃

Accepted Answer

4 Fe + 3 O

Question 14

When oxygen,O₂,is passed through an electrical spark (lightning is a good natural source of an electrical spark),ozone,O₃,is formed.When the equation is balanced,the coefficient of oxygen is

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 15

When the equation below is balanced,the coefficient of the product is:
Fe + O₂ → Fe₂O₃

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 16

Avogadro's number is

Accepted Answer

A) 6.02 × 10²³ 
B) 6.02 × 10⁻²³ 
C) 3.02 × 10²⁶ 
D) 2.06 × 10³² 
A) 6.02 × 10²³ 
B) 6.02 × 10⁻²³ 
C) 3.02 × 10²⁶ 
D) 2.06 × 10³²

Question 17

When 4 liters of nitrogen gas react with 6 liters of hydrogen gas at constant temperature and pressure,how many liters of ammonia gas will be produced?

Accepted Answer

A) 4 
B) 6 
C) 8 
D) 10 
A) 4 
B) 6 
C) 8 
D) 10

Question 18

Balance the equation: C₈H₁₈ + O₂ → CO₂ + H₂O

Accepted Answer

2 C₈H₁₈ +

Question 19

How many molecules are in 237 g (about a cup)of water?

Accepted Answer

A) 13.1 
B) 4267 
C) 6)02 × 10²³ 
D) 7)92 × 10²⁴ 
A) 13.1 
B) 4267 
C) 6)02 × 10²³ 
D) 7)92 × 10²⁴

Question 20

Tin was among the first metals used by humans.Elemental tin is produced by heating tin(IV)oxide,the principal ore of tin,with carbon.The products of this reaction are tin and carbon dioxide.Write and balance the equation.

Accepted Answer

The answer of Tin was among the first metals used...

Exam 5: Chemical Accounting

When 15 mL of ethanol is mixed with 55 mL of water,ethanol is the solute.

The mass percent of a solution that has 0.50 mol of NaOH in 100 g of solution is 5.0%.

Molarity is a measure of

An addition reaction will have a higher percent atom economy than a substitution reaction.

How many liters of a 0.2 M HCl solution are needed in order to have 1.0 moles of HCl?

A solution that is 1% by mass contains

The following reaction is important in the removal of sulfur dioxide,a major source of acid rain,from the smokestacks of coal burning power plants.When the equation below is balanced,the coefficient of oxygen is: CaO + SO₂ + O₂ → CaSO₄

In order for the law of combining volumes to apply,all of the following must be the same for all reactants EXCEPT

Joseph Priestley discovered oxygen in 1774 by heating mercury(II)oxide.The compound decomposes into its elements.How much oxygen,O₂,is produced by the decomposition of 25 g of HgO?

The stoichiometric factor relates the moles of any two substances in a balanced chemical reaction.

When the equation below is balanced,the coefficient of sodium cyanide is: NaCN + H₂SO₄ → Na₂SO₄ + HCN

The following reaction is important in the removal of sulfur dioxide,a major source of acid rain,from the smokestacks of coal burning power plants.When the equation below is balanced,the coefficient of calcium oxide (commonly called "lime")is: CaO + SO₂ + O₂ → CaSO₄

Balance the equation: Fe + O₂ → Fe₂O₃

When oxygen,O₂,is passed through an electrical spark (lightning is a good natural source of an electrical spark),ozone,O₃,is formed.When the equation is balanced,the coefficient of oxygen is

When the equation below is balanced,the coefficient of the product is: Fe + O₂ → Fe₂O₃

Avogadro's number is

When 4 liters of nitrogen gas react with 6 liters of hydrogen gas at constant temperature and pressure,how many liters of ammonia gas will be produced?

Balance the equation: C₈H₁₈ + O₂ → CO₂ + H₂O

How many molecules are in 237 g (about a cup)of water?

Tin was among the first metals used by humans.Elemental tin is produced by heating tin(IV)oxide,the principal ore of tin,with carbon.The products of this reaction are tin and carbon dioxide.Write and balance the equation.

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