Name: 
 

Chemistry 12 - Chapter 6 Quiz



True/False
Indicate whether the sentence or statement is true or false.
 

1. 

The molecular species that exists at a maximum of potential energy is called the activation energy.
 

2. 

The instantaneous rate of reaction is determined graphically from the slope of a tangent.
 

3. 

Elementary steps in reaction mechanisms generally involve collisions of three or four molecules.
 

4. 

The elementary steps in a mechanism must add up to the overall equation.
 

5. 

If one molecule is involved in the rate-determining step, the reaction is called first order.
 

6. 

The enthalpy change is smaller for a catalyzed chemical reaction.
 

7. 

An enzyme is a biological catalyst.
 

8. 

The threshold energy is a minimum kinetic energy required for the activated complex to be formed.
 

9. 

The rate-determining step in a mechanism is the fastest step.
 

10. 

A homogeneous catalyst is one in which the catalyst and the reactants are in different phase.
 

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

11. 

In the chemical reaction
            CH4(g)  +  2 O2(g)  c12-ch6_files/i0130000.jpg CO2(g)  + 2 H2O(g)
      the rate of consumption of oxygen gas is observed to be 4 mol/(Lc12-ch6_files/i0130001.jpgmin). What is the rate of production of carbon dioxide?
a.
1 mol/(Lc12-ch6_files/i0130002.jpgmin)
b.
2 mol/(Lc12-ch6_files/i0130003.jpgmin)
c.
4 mol/(Lc12-ch6_files/i0130004.jpgmin)
d.
8 mol/(Lc12-ch6_files/i0130005.jpgmin)
e.
16 mol/(Lc12-ch6_files/i0130006.jpgmin)
 

12. 

Which of the following factors that affect rate of reaction applies only to heterogeneous systems?
a.
chemical nature of reactants
b.
concentration
c.
temperature
d.
catalysis
e.
surface area
 

13. 

What is the overall order of reaction for the elementary system A + 2 B c12-ch6_files/i0150000.jpg products?
a.
0
b.
1
c.
2
d.
3
e.
5
 

14. 

If the initial rate of reaction is observed to increase by a factor of nine when the concentration of a reactant is tripled, what is the order of reaction with respect to that reactant?
a.
0
b.
1
c.
2
d.
3
e.
cannot be determined from this information
 
 
c12-ch6_files/i0170000.jpg

Figure 1
 

15. 

In Figure 1, the activation energy for the uncatalyzed reaction is
a.
A
b.
B
c.
C
d.
D
e.
A or C
 

16. 

In Figure 1, the enthalpy change for the catalyzed reaction is
a.
A
b.
B
c.
C
d.
D
e.
A or C
 

17. 

When zinc, iron, and lead are reacted with hydrochloric acid, the variable most easily measured in order to determine the effect of the chemical nature of the reactants on reaction rate is
a.
temperature
b.
colour
c.
surface area
d.
volume of gas
e.
concentration
 

18. 

What would the units of the rate constant, k, be in a second-order equation if rate was measured in mol/(Lc12-ch6_files/i0210000.jpgs) and all concentrations in mol/L?
a.
s-1
b.
L/(molc12-ch6_files/i0210001.jpgs)
c.
L2/(mol2c12-ch6_files/i0210002.jpgs)
d.
L3/(mol3c12-ch6_files/i0210003.jpgs)
e.
mol2/(L2c12-ch6_files/i0210004.jpgs)
 



 
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