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Rates/Rate law/Mechanisms

Total questions: 25

Worksheet time: 25mins

Name
Class
Date
1.

The rate of a reaction is dependent on the concentration of the reactants

a)

True

b)

False

2.

What does collision theory state?

a)

For a reaction to occur, particles must collide with sufficient energy.

b)

For a reaction to occur, particles must collide with proper orientation.

c)

Both of the above are correct.

3.

The K value of a reaction is dependent on the concentration of the reactants.

a)

True

b)

False

4.

What does a catalyst do?

a)

Increase the rate of all steps of a reaction.

b)

Lowers the activation energy of the slow step

c)

Cools the reaction down

d)

Increases the concentration of the reaction

5.

In an exothermic reaction, heat is ...

a)

absorbed

b)

released

6.

In an endothermic reaction....

a)

The products have more energy then the reactants.

b)

The reactants have more energy then the products.

7.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
8.
This helps to speed up a reaction but does not take part in the chemical reaction. 
a)
coeffiecents
b)
reactants
c)
catalyst
d)
combustion
9.
Located on the left side of the reaction
a)
reactants
b)
products
10.
In which experiment is the rate of reaction between hydrochloric acid and calcium carbonate slowest? 
a)
A
b)
B
c)
C
d)
D
11.
Calcium carbonate reacts with hydrochloric acid to form carbon dioxide. Which changes would slow this reaction down?
 1  decreasing the concentration of hydrochloric acid
 2  decreasing the particle size of calcium carbonate
3  decreasing the temperature 
a)
1 and 2 only 
b)
1 and 3 only 
c)
2 and 3 only 
d)
1, 2 and 3 
12.
Which trials would be used to measure the rate exponent for A?
a)
trials 1 and 2
b)
trials 1 and 3
c)
trials 2 and 3
13.
Which trials would be used to find the rate exponent for B
a)
trials 1 and 2
b)
trials 1 and 3
c)
trials 2 and 3
14.
What is the rate exponent for A?
a)
0
b)
1
c)
2
15.
What is the rate exponent for B?
a)
0
b)
1
c)
2
16.
Which trial do you insert into the rate law to find k (rate = k [A]m[B]n)?
a)
trial 1
b)
trial 2
c)
trial 3
d)
any trial will work
17.
What does a k value tell you?
a)
the specific rate of a reaction given certain concentrations
b)
The generalized rate of a reaction regardless of concentrations
18.
What is the catalyst in the following rate mechanism?
a)
HBr
b)
H2O
c)
There is no catalyst
19.
How many intermediates are in the following rate mechanism?
a)
0
b)
1
c)
2
d)
3
20.
How many elementary steps are in the following reaction
a)
1
b)
2
c)
3
21.
Which is the rate determining step?
a)
1
b)
2
c)
3
22.

In an endothermic reaction....

a)

Heat is released by the reactants.

b)

Heat is stored in the bonds of the products.

23.
What does a catalyst do to the activation energy of a reaction
a)
nothing
b)
lowers it
c)
raises it
24.
Which of the elementary steps  has the highest activation energy?
a)
slow
b)
fast
25.
Which step does a catalyst affect?
a)
slow 
b)
fast

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