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Unit 15 Online Quiz

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

 1. 

When a catalyst lowers the activation energy of a reaction, the rate of the reaction
a.
increases
b.
decreases
c.
stays the same
 

 2. 

__ is the degree of disorder of a substance.  It is represented with the symbol __.  
a.
Enthalpy, H
c.
Entropy, H
b.
Enthalpy, S
d.
Entropy, S
 

 3. 

A negative value for the heat of reaction means that the reaction is
a.
endothermic
c.
spontaneous
b.
exothermic
d.
nonspontaneous
 

 4. 

Which change results in a release of energy? 
a.
the melting of H2O (s)
c.
the evaporation of H2O (l)
b.
the boiling of H2O (l)
d.
the condensation of H2O (g)
 

Matching
 
 
Determine whether each reaction represents an increase, a decrease, or no change in entropy.
a.
increase
b.
decrease
c.
remain the same
 

 5. 

CO2 (g) --> C (s) + O2 (g)
 

 6. 

CO2 (g) --> CO2 (s)
 

 7. 

NaCl (s) --> Na+1 (aq) + Cl-1 (aq)
 

 8. 

2 NH3 (g) --> N2 (g) + 3 H2 (g)
 



 
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