Name: 
 

Ch 18 - Reaction Reaction and Equilibrium



Matching (Value 5)
 
 
Match each item with the correct statement below.
a.
activated complex
d.
activation energy
b.
reaction rate
e.
rate
c.
inhibitor
 

 1. 

the minimum energy colliding particles must have in order to react
 

 2. 

arrangement of atoms at the peak of an energy barrier
 

 3. 

the number of atoms, ions, or molecules that react in a given time to form products
 

 4. 

a substance that interferes with a catalyst
 

 5. 

amount of reactant changing per unit of time (kg/sec) (single word)
 

Multiple Choice (Value 11)
Identify the choice that best completes the statement or answers the question.
 

 6. 

Which expression represents a reaction rate?
a.
time/mass
c.
energy/time
b.
number/time
d.
time/energy
 

 7. 

Another name for the activated complex is ____.
a.
energy barrier
c.
rate limiter
b.
transition state
d.
collision group
 

 8. 

At what stage of a reaction do atoms have the highest energy?
a.
reactant stage
b.
product stage
c.
transition state stage
d.
The stage of highest energy depends on the atom.
 

 9. 

Activation energy is ____.
a.
the heat released in a reaction
b.
an energy barrier between reactants and products
c.
the energy given off when reactants collide
d.
generally very high for a reaction that takes place rapidly
 

 10. 

Why does a higher temperature cause a reaction to go faster?
a.
There are more collisions per second only.
b.
Collisions occur with greater energy only.
c.
There are more collisions per second and the collisions are of greater energy.
d.
There are more collisions per second or the collisions are of greater energy.
 

 11. 

Why does a higher concentration make a reaction faster?
a.
There are more collisions per second only.
b.
Collisions occur with greater energy only.
c.
There are more collisions per second and the collisions are of greater energy.
d.
There are more collisions per second or the collisions are of greater energy.
 

 12. 

Why does a catalyst cause a reaction to proceed faster?
a.
There are more collisions per second only.
b.
The collisions occur with greater energy only.
c.
The activation energy is lowered only.
d.
There are more collisions per second and the collisions are of greater energy.
 

 13. 

What happens to a catalyst in a reaction?
a.
It is unchanged.
c.
It is incorporated into the reactants.
b.
It is incorporated into the products.
d.
It evaporates away.
 

 14. 

A catalyst works by ____.
a.
lowering the activation energy barrier
b.
shifting the equilibrium position toward the products
c.
changing the temperature of the reactants
d.
changing the particle size of the reactants
 

 15. 

The rate of a chemical reaction normally ____.
a.
decreases as temperature increases
b.
is slowed down by a catalyst
c.
increases as reactant concentration increases
d.
decreases as reactant concentration increases
 

 16. 

Which of the following substances act as catalysts in the body?
a.
carbohydrates
c.
lipids
b.
nucleic acids
d.
enzymes
 

Essay (Value 4)
 

 17. 

Explain the effects of reactant concentration and particle size on the rate of a reaction.
 

 18. 

What is the effect of a catalyst on the rate of a reaction? Give an example of a catalyst.
 



 
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