Question 1

In an endothermic reaction,

Accepted Answer

A) the products have the same energy that the reactants. 
B) energy is absorbed by the system. 
C) heat flows out of the system. 
D) the products have less energy that the reactants. 
E) the temperature of the system increases. 
A) the products have the same energy that the reactants. 
B) energy is absorbed by the system. 
C) heat flows out of the system. 
D) the products have less energy that the reactants. 
E) the temperature of the system increases. B

Question 2

In this reaction, what is the correct coefficient for hydrogen gas?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5 B

Question 3

Accepted Answer

A) 16.3 g 
B) 32.6 g 
C) 72.9 g 
D) 155 g 
E) 65.4 g 
A) 16.3 g 
B) 32.6 g 
C) 72.9 g 
D) 155 g 
E) 65.4 g E

Question 4

For the question(s)that follow, consider the following equation.  
-When  36.0 g of   react, how many grams of   are produced?

Accepted Answer

A)   10.0 g 
B)   102 g 
C)   34.0 g 
D)   5.67 g 
A)   10.0 g 
B)   102 g 
C)   34.0 g 
D)   5.67 g

Question 5

3.00  moles of   have a mass of

Accepted Answer

A)   46.0 g. 
B)   90.0 g. 
C)   138 g. 
D)   45.0 g. 
E)   30.0 g. 
A)   46.0 g. 
B)   90.0 g. 
C)   138 g. 
D)   45.0 g. 
E)   30.0 g.

Question 6

How many grams of   are there in  0.500  mole of

Accepted Answer

A)   160 g 
B)   79.9 g 
C)   63.8 g 
D)   51.9 g 
E)   35.9 g 
A)   160 g 
B)   79.9 g 
C)   63.8 g 
D)   51.9 g 
E)   35.9 g

Question 7

The molar mass of copper(II) nitrate,   is _____.

Accepted Answer

The answer of The molar mass of copper(II) nitrate, ...

Question 8

Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of   reacted to the number of moles of   produced?

Accepted Answer

A)    
B)    
C)    
D)   
Е)   
A)    
B)    
C)    
D)   
Е)

Question 9

Which of the following describes an oxidation reaction?

Accepted Answer

A) gain of electrons or loss of H 
B) loss of electrons or gain of hydrogen 
C) gain of electrons or gain of oxygen 
D) loss of electrons or gain of oxygen 
E) loss of electrons or loss of oxygen 
A) gain of electrons or loss of H 
B) loss of electrons or gain of hydrogen 
C) gain of electrons or gain of oxygen 
D) loss of electrons or gain of oxygen 
E) loss of electrons or loss of oxygen

Question 10

What type of reaction is the following?

Accepted Answer

The answer of What type of reaction is the following?...

Question 11

Calculate the molar mass of potassium chloride, KCl.

Accepted Answer

A) 74.6 g 
B) 67.4 g 
C) 6.74 g 
D) 54.5 g 
E) 19.0 g 
A) 74.6 g 
B) 67.4 g 
C) 6.74 g 
D) 54.5 g 
E) 19.0 g

Question 12

-What is the coefficient for carbon dioxide in the balanced equation?

Accepted Answer

A) 2 
B) 4 
C) 5 
D) 6 
E) 8 
A) 2 
B) 4 
C) 5 
D) 6 
E) 8

Question 13

If the reaction shown below is exothermic, the energy level of the reactants is

Accepted Answer

A) possibly lower, possibly higher than that of the products. 
B) the same as that of the products. 
C) lower than that of the products. 
D) higher than that of the products. 
A) possibly lower, possibly higher than that of the products. 
B) the same as that of the products. 
C) lower than that of the products. 
D) higher than that of the products.

Question 14

In this reaction, when the equation is correctly balanced, what is the correct coefficient for calcium oxide?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 15

How many grams of   are produced from  125 g of   and excess

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 16

In a ________ reaction, two or more elements or compounds form one product.

Accepted Answer

A) combination 
B) combustion 
C) decomposition 
D) single replacement 
E) double replacement 
A) combination 
B) combustion 
C) decomposition 
D) single replacement 
E) double replacement

Question 17

One mole of helium gas has a mass of

Accepted Answer

A) 1.00 g. 
B) 2.00 g. 
C) 4.00 g. 
D) 3.00 g. 
E) 8.00 g. 
A) 1.00 g. 
B) 2.00 g. 
C) 4.00 g. 
D) 3.00 g. 
E) 8.00 g.

Question 18

Accepted Answer

A) 206 g 
B) 132 g 
C) 125 g 
D) 165 g 
E) 7.35 g 
A) 206 g 
B) 132 g 
C) 125 g 
D) 165 g 
E) 7.35 g

Question 19

-What is the coefficient for water in the balanced equation?

Accepted Answer

A) 2 
B) 4 
C) 5 
D) 6 
E) 8 
A) 2 
B) 4 
C) 5 
D) 6 
E) 8

Question 20

Which of the following is an oxidation-reduction reaction?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Exam 7: Chemical Reactions and Quantities

In an endothermic reaction,

In this reaction, what is the correct coefficient for hydrogen gas?

For the question(s)that follow, consider the following equation. -When 36.0 g of react, how many grams of are produced?

3.00 moles of have a mass of

How many grams of are there in 0.500 mole of

The molar mass of copper(II) nitrate, is _____.

Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of reacted to the number of moles of produced?

Which of the following describes an oxidation reaction?

What type of reaction is the following?

Calculate the molar mass of potassium chloride, KCl.

-What is the coefficient for carbon dioxide in the balanced equation?

If the reaction shown below is exothermic, the energy level of the reactants is

In this reaction, when the equation is correctly balanced, what is the correct coefficient for calcium oxide?

How many grams of are produced from 125 g of and excess

In a ________ reaction, two or more elements or compounds form one product.

One mole of helium gas has a mass of

-What is the coefficient for water in the balanced equation?

Which of the following is an oxidation-reduction reaction?

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