Question 1

The following reaction takes place when an electric current is passed through water. It is an example of a ________ reaction.

Accepted Answer

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

Question 2

The number of moles of MgO produced when  0.20  mole of   reacts completely is

Accepted Answer

A)   0.80  mole. 
B)   0.10  mole. 
C)   0.20  mole. 
D)   0.40  mole. 
E)   0.60  mole. 
A)   0.80  mole. 
B)   0.10  mole. 
C)   0.20  mole. 
D)   0.40  mole. 
E)   0.60  mole.

Question 3

The molar mass of potassium is

Accepted Answer

A)    
B)   31.0 g. 
C)   15 g . 
D)   19 g. 
E)   39.1 g . 
A)    
B)   31.0 g. 
C)   15 g . 
D)   19 g. 
E)   39.1 g .

Question 4

The molar mass of calcium hydroxide,   is

Accepted Answer

A) 58.1 g. 
B) 74.1 g. 
C) 114.2 g. 
D) 57.1 g. 
E) 38.0 g. 
A) 58.1 g. 
B) 74.1 g. 
C) 114.2 g. 
D) 57.1 g. 
E) 38.0 g.

Question 5

The molar mass of C3H8O2 is

Accepted Answer

A) 52.0 g. 
B) 69.0 g. 
C) 76.0 g. 
D) 60.0 g. 
E) 29.0 g. 
A) 52.0 g. 
B) 69.0 g. 
C) 76.0 g. 
D) 60.0 g. 
E) 29.0 g.

Question 6

What type of reaction is:

Accepted Answer

A) an exothermic reaction 
B) a combination reaction 
C) a decomposition reaction 
D) an endothermic reaction 
E) a single replacement reaction 
A) an exothermic reaction 
B) a combination reaction 
C) a decomposition reaction 
D) an endothermic reaction 
E) a single replacement reaction

Question 7

Accepted Answer

A) 125 g 
B) 186 g 
C) 145 g 
D) 155 g 
E) 129 g 
A) 125 g 
B) 186 g 
C) 145 g 
D) 155 g 
E) 129 g

Question 8

What is the molar mass of sucrose

Accepted Answer

A)   182 g 
B)   210 g 
C)   342 g 
D)   29.0 g 
E)   50.2 g 
A)   182 g 
B)   210 g 
C)   342 g 
D)   29.0 g 
E)   50.2 g

Question 9

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

Accepted Answer

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

Question 10

How many grams of glucose   are in  3.55  moles of glucose?

Accepted Answer

A) 50.7 g 
B) 180. g 
C) 639 g 
D) 426 g 
E) 103 g 
A) 50.7 g 
B) 180. g 
C) 639 g 
D) 426 g 
E) 103 g

Question 11

What is the molar mass of helium?

Accepted Answer

The answer of What is the molar mass of helium?...

Question 12

What is oxidized and what is reduced, respectively, in the following reaction?

Accepted Answer

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

Question 13

How many moles of water,  H2O, are present in  75.0 g  of H2O ?

Accepted Answer

A)   4.16  moles 
B)   75.0  moles 
C)    
D)   7.50  moles 
E)   4.41  moles 
A)   4.16  moles 
B)   75.0  moles 
C)    
D)   7.50  moles 
E)   4.41  moles

Question 14

How many moles of magnesium are needed to react with  0.50  mole of

Accepted Answer

A)   4.0  moles 
B)   0.50 mole 
C)   1.0  moles 
D)   3.0  moles 
E)   2.0  moles 
A)   4.0  moles 
B)   0.50 mole 
C)   1.0  moles 
D)   3.0  moles 
E)   2.0  moles

Question 15

When  3.05  moles of   are mixed with  5.03  moles of   the limiting reactant is

Accepted Answer

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

Question 16

Barium chloride and sodium sulfate react according to the following equation.   Answer the question(s)that follow about this reaction.
-How many grams of barium chloride are needed to make 100. grams of barium sulfate?

Accepted Answer

A) 46.6 g 
B) 233.3 g 
C) 44.9 g 
D) 89.2 g 
E) 208.3 g 
A) 46.6 g 
B) 233.3 g 
C) 44.9 g 
D) 89.2 g 
E) 208.3 g

Question 17

In the reaction of silver nitrate with sodium chloride, how many grams of silver chloride will be produced from 100. g of silver nitrate when it is mixed with an excess of sodium chloride? The equation for the reaction is below.

Accepted Answer

A) 107.9 g 
B) 169.9 g 
C) 58.9 g 
D) 84.4 g 
E) 0.589 g 
A) 107.9 g 
B) 169.9 g 
C) 58.9 g 
D) 84.4 g 
E) 0.589 g

Question 18

What type of reaction is the following?

Accepted Answer

combinatio

Question 19

How many grams of hydrogen are needed to produce 1.80 g of water according to this equation?

Accepted Answer

A) 0.180 g 
B) 2.00 g 
C) 4.00 g 
D) 0.100 g 
E) 0.200 g 
A) 0.180 g 
B) 2.00 g 
C) 4.00 g 
D) 0.100 g 
E) 0.200 g

Question 20

In any balanced chemical equation, the number of each type of atom on both sides of the equation is

Accepted Answer

A) doubled. 
B) dependent on the temperature. 
C) the same. 
D) decreased by one. 
E) increased by one. 
A) doubled. 
B) dependent on the temperature. 
C) the same. 
D) decreased by one. 
E) increased by one.

Exam 7: Chemical Reactions and Quantities

The following reaction takes place when an electric current is passed through water. It is an example of a ________ reaction.

The number of moles of MgO produced when 0.20 mole of reacts completely is

The molar mass of potassium is

The molar mass of calcium hydroxide, is

The molar mass of C3H8O2 is

What type of reaction is:

What is the molar mass of sucrose

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

How many grams of glucose are in 3.55 moles of glucose?

What is the molar mass of helium?

What is oxidized and what is reduced, respectively, in the following reaction?

How many moles of water, H2O, are present in 75.0 g of H2O ?

How many moles of magnesium are needed to react with 0.50 mole of

When 3.05 moles of are mixed with 5.03 moles of the limiting reactant is

Barium chloride and sodium sulfate react according to the following equation. Answer the question(s)that follow about this reaction. -How many grams of barium chloride are needed to make 100. grams of barium sulfate?

In the reaction of silver nitrate with sodium chloride, how many grams of silver chloride will be produced from 100. g of silver nitrate when it is mixed with an excess of sodium chloride? The equation for the reaction is below.

What type of reaction is the following?

How many grams of hydrogen are needed to produce 1.80 g of water according to this equation?

In any balanced chemical equation, the number of each type of atom on both sides of the equation is

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The molar mass of C₃H₈O₂ is

How many moles of water, H₂O, are present in 75.0 g of H₂O ?