Practice Test
 How Fast?  Which way did it go? Test
 

Directions:  Number a piece of paper from 1 to 20.  Answer each question, writing your answers on
your paper.  The correct answers to the questions appear at the end of the practice test.
 

Match the definition on the left with the terms on the right.

1.  A reaction that takes in energy as it proceeds.                                          A.  Activation energy
                                                                                                                  B.  Catalyst
2.  If a stress is applied to a system in equilibrium,                                         C.  Collision Theory
     the system changes to reduce or relieve the stress.                                  D.  Endothermic
                                                                                                                  E.  Exothermic
3.  The minimum energy colliding particles must have                                      F.  Kinetic Theory
      in order to react.                                                                                   G.  LeChatelier's principle

4.  A substance used to speed up a chemical reaction,
     but is not used up in the reaction.

5.  The idea that matter is made up of small particles
      that are in constant motion.
 

Choose the best answer.

6.  In general, if temperature increases, the rate of a chemical reaction will:
                   a)  slow down                           b) speed up
                   c)  remain the same                   d) It can either speed up or slow down
 

7.  The primary reason an increase in concentration results in an increase in the
       reaction rate is that:

            a)  the frequency of collisions between particles increases.
            b)  the potential energy of the particles increases
            c)  the number of particles with the required activation energy increases
            d)  the force of attraction between particles increases

The next three questions refer to the following chemical equilibrium equation where "A", "B", and "AB" are all gases.

                    A    +   B    +  heat   <--->  AB

8.  What would happen if the amount of "A" were increased in the reaction?
             a)  more products would be formed                    b) more reactants would be formed
             c)  it would not affect the equilibrium                   d) fewer products would be formed

9.  What would happen if the reaction vessel were put in an ice/water bath?
            a)  more products would be formed                   b) more reactants would be formed
            c)  it would not affect the equilibrium                  d) fewer reactants would be formed

10.  What would happen to the equilibrium amounts if the pressure on the system were increased?
           a)  more products would be formed                    b) more reactants would be formed
           c)  it would not affect the equilibrium                   d) fewer products would be formed
 

Label the parts of the energy curve below.

15.  Is the above reaction energy curve exothermic or endothermic?


 

16.  At what minute does the reaction reach equilibrium?

17.  How do you know the reaction reaches an equilibrium?

18.  What would happen to line B if more reactants are added to the reaction after minute 5?
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

ANSWERS

1.  D
2.  G
3.  A
4.  B
5.  F
6.  b
7.  a
8.  a
9.  b
10.  a
11.  Reactants
12.  Products
13.  Energy of activation
14.  Energy released
15.  exothermic
16.  day 3
17.  The two lines become parallel
18.  The line would go up