Chemistry Concepts and Applications

Chapter 6: Chemical Equations and Reactions

Chapter Test Practice

1
This type of chemical reaction has energy written as a product.
A)endothermic
B)energy-absorbing
C)exothermic
D)light-absorbing
2
A number placed before a formula to indicate how many units of the substance are involved in a chemical reaction is called a __________.
A)coefficient
B)substrate
C)subscript
D)superscript
3
What is the coefficient for NaOH in the equation that describes its reaction with CO2 to produce Na2CO3 and H2O?
A)1
B)2
C)3
D)4
4
A reaction between magnesium chloride and silver nitrate yields magnesium nitrate and silver chloride. What is the coefficient for magnesium nitrate in the balanced equation for the reaction?
A)1
B)2
C)3
D)4
5
If a lump of coal contains 200 billion carbon atoms and is burned completely, how many molecules of carbon dioxide are produced?

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A)100 billion
B)200 billion
C)300 billion
D)600 billion
6
What type of reaction is represented by the equation 2Fe + 3Cl2 → 2FeCl3?
A)combustion
B)decomposition
C)single displacement
D)synthesis
7
What type of reaction is represented by the equation Pb(NO3)2 + K2CrO4 → PbCrO4 + 2KNO3?
A)decomposition
B)single displacement
C)double displacement
D)synthesis
8
What type of reaction occurs when potassium and chlorine gas produce potassium chloride?
A)combustion
B)decomposition
C)displacement
D)synthesis
9
Activation energy is the energy required to __________.
A)initiate a reaction
B)stop a reaction
C)speed up a reaction
D)slow down a reaction
10
A substance that increases the rate of a chemical reaction without being permanently changed or consumed is called __________.
A)a catalyst
B)a product
C)a reactant
D)an equilibriate
11
Adding energy to an equilibrium system that is exothermic to the right causes the system to __________.
A)shift to the left
B)shift to the right
C)remain unchanged
D)slow down
12
Which is NOT a chemical change?
A)Two clear liquids mix together and form a solid yellow precipitate.
B)A marshmallow burns over an open fire.
C)A puddle evaporates in the sunlight.
D)Milk left out overnight becomes lumpy.
13
In the reaction between an iron bar and oxygen gas, iron(III) oxide is known as the __________.
A)reactant
B)product
C)precipitate
D)catalyst
14
When gasoline is chemically combined with oxygen inside your car's engine, the products are mostly water and carbon dioxide. What class of reaction is this?
A)decomposition
B)synthesis
C)combustion
D)single displacement
15
Why is the Declaration of Independence kept in a case with most of the air removed?
A)Low pressure air is a catalyst.
B)At low pressure, reaction rate between the air and the paper is reduced.
C)At low pressure, reaction rate between the air and the paper is increased.
D)At low pressure, the temperature is lower.
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