Question 1

What type of reaction is the following?

Accepted Answer

decomposit

Question 2

When  10.0 g of   reacts, the actual yield of     is  8.50 g. What is the percent yield?

Accepted Answer

A)   20.6 % 
B)   8.5 % 
C)   41.3 % 
D)   85.0 % 
E)   51.5 % 
A)   20.6 % 
B)   8.5 % 
C)   41.3 % 
D)   85.0 % 
E)   51.5 %

Question 3

The reaction of carbon with oxygen to produce carbon monoxide is an example of which class of reaction?

Accepted Answer

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

Question 4

Which of the following gives the balanced equation for this reaction?

Accepted Answer

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

Question 5

One mole of particles of any substance contains how many particles?

Accepted Answer

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

Question 6

In the reaction of nitrogen gas,   with hydrogen gas,   to form ammonia gas,  , how many moles of hydrogen are needed to react with two moles of nitrogen?

Accepted Answer

A)  6 moles 
B)  8 moles 
C)  4 moles 
D)  10 moles 
E)  2 moles 
A)  6 moles 
B)  8 moles 
C)  4 moles 
D)  10 moles 
E)  2 moles

Question 7

The number of molecules in 1 mole of hydrogen gas is ________.

Accepted Answer

The answer of The number of molecules in 1 mole...

Question 8

Which of the following correctly gives the correct coefficients for the reaction below?

Accepted Answer

A) 2, 4, 2, 8 
B) 1, 4, 1, 4 
C) 2, 4, 2, 4 
D) 1, 2, 1, 4 
E) 1, 1, 1 ,1 
A) 2, 4, 2, 8 
B) 1, 4, 1, 4 
C) 2, 4, 2, 4 
D) 1, 2, 1, 4 
E) 1, 1, 1 ,1

Question 9

A chemical equation is balanced when

Accepted Answer

A) the total number of ions is the same in reactants and products. 
B) the sum of the coefficients of the reactants is equal to the sum of the coefficients of the products. 
C) the number of atoms of each element is the same in reactants and products. 
D) the charge on each atom is the same in reactants and products. 
E) the total number of molecules is the same in reactants and products. 
A) the total number of ions is the same in reactants and products. 
B) the sum of the coefficients of the reactants is equal to the sum of the coefficients of the products. 
C) the number of atoms of each element is the same in reactants and products. 
D) the charge on each atom is the same in reactants and products. 
E) the total number of molecules is the same in reactants and products.

Question 10

In an oxidation-reduction reaction, the substance reduced always

Accepted Answer

A) becomes a charged species. 
B) experiences a gain of electrons. 
C) takes on oxygen atoms. 
D) gives up hydrogen atoms. 
E) experiences a loss of electrons. 
A) becomes a charged species. 
B) experiences a gain of electrons. 
C) takes on oxygen atoms. 
D) gives up hydrogen atoms. 
E) experiences a loss of electrons.

Question 11

For the reaction  
how many kcal are needed to form  2.00  moles

Accepted Answer

A)   68.5 kcal 
B)   548 kcal 
C)   190 kcal 
D)  274 kcal 
E)   137 kcal 
A)   68.5 kcal 
B)   548 kcal 
C)   190 kcal 
D)  274 kcal 
E)   137 kcal

Question 12

A reaction that releases energy as it occurs is classified as a(n)

Accepted Answer

A) oxidation-reduction reaction. 
B) decomposition reaction. 
C) endothermic reaction. 
D) exothermic reaction. 
A) oxidation-reduction reaction. 
B) decomposition reaction. 
C) endothermic reaction. 
D) exothermic reaction.

Question 13

What coefficient is placed in front of   to complete the balancing of the following equation?

Accepted Answer

A) 7 
B) 1 
C) 3 
D) 5 
E) 9 
A) 7 
B) 1 
C) 3 
D) 5 
E) 9

Question 14

The reaction of methane with oxygen to produce carbon dioxide and water is an example of which class of reaction?

Accepted Answer

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

Question 15

In the following reaction, when the equation is correctly balanced, what is the correct coefficient for

Accepted Answer

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

Question 16

-What is the coefficient for oxygen 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 17

How many moles of carbon are there in  0.500  mole of

Accepted Answer

A)    moles 
B)   4.00  moles 
C)   1.00  moles 
D)   0.500  moles 
E)   3.00  moles 
A)    moles 
B)   4.00  moles 
C)   1.00  moles 
D)   0.500  moles 
E)   3.00  moles

Question 18

When  85.0 g of   are mixed with  160 . g of   how many moles of   that can be produced?

Accepted Answer

A) 2.50 moles 
B) 7.81 moles 
C) 5.00 moles 
D) 5.31 moles 
A) 2.50 moles 
B) 7.81 moles 
C) 5.00 moles 
D) 5.31 moles

Question 19

What is the classification for this reaction?

Accepted Answer

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

Question 20

How many moles of iron are present in   atoms of iron?

Accepted Answer

A)    
B)   1.90  moles 
C)  292 moles 
D)   5.23  moles 
E)   0.523  moles 
A)    
B)   1.90  moles 
C)  292 moles 
D)   5.23  moles 
E)   0.523  moles

Exam 7: Chemical Reactions and Quantities

What type of reaction is the following?

When 10.0 g of reacts, the actual yield of is 8.50 g. What is the percent yield?

The reaction of carbon with oxygen to produce carbon monoxide is an example of which class of reaction?

Which of the following gives the balanced equation for this reaction?

One mole of particles of any substance contains how many particles?

In the reaction of nitrogen gas, with hydrogen gas, to form ammonia gas, , how many moles of hydrogen are needed to react with two moles of nitrogen?

The number of molecules in 1 mole of hydrogen gas is ________.

Which of the following correctly gives the correct coefficients for the reaction below?

A chemical equation is balanced when

In an oxidation-reduction reaction, the substance reduced always

For the reaction how many kcal are needed to form 2.00 moles

A reaction that releases energy as it occurs is classified as a(n)

What coefficient is placed in front of to complete the balancing of the following equation?

The reaction of methane with oxygen to produce carbon dioxide and water is an example of which class of reaction?

In the following reaction, when the equation is correctly balanced, what is the correct coefficient for

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

How many moles of carbon are there in 0.500 mole of

When 85.0 g of are mixed with 160 . g of how many moles of that can be produced?

What is the classification for this reaction?

How many moles of iron are present in atoms of iron?

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