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Chemistry Quiz
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image Chapter 17: Equilibrium - Practice Quiz image
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This practice quiz is for you to check your understanding of the concepts and skills covered in the current unit.		 image
 
1.
As a system approaches equilibrium, the rates of the forward and reverse reactions
become more unequal.
become more nearly equal.
remain unchanged.
2.
The reaction of vinegar (acetic acid) with water is
           CH3COOH + H2O Û CH3COO- + H3O+
and it is an equilibrium. What is happening to the concentration of H3O+ before equilibrium is reached?
it is not changing.
it is increasing.
it is decreasing.
3.
For the reaction given in item 2, imagine that the reaction is started by adding acetic acid and water to an empty beaker. When is the rate of the forward reaction the greatest ?
At the start of the reaction.
At the middle of the reaction.
At the end of the reaction.
4.
Suppose that the reaction of item 2 is at equilibrium. What effect, if any, would adding sodium acetate, NaCH3COOH, have on the reaction?
It would speed it up in the forward direction.
It would speed it up in the reverse direction.
It would not have any effect.
5.
In an equilibrium, the formation of products, and the formation of reactants
occur at the same time.
occur only at the beginning of the reaction.
occur only at the end of the reaction.
6.
In an exothermic reaction, if the temperature is increased, the reaction will
shift to the right.
shift to the left.
not be changed.
7.
An increase in pressure of an equilibrium system will favor the
forward reaction.
direction that has to the least moles of gas.
direction that produces the least heat.
8.
Le Chatelier's Principle is used to predict
the concentration of reactants.
the concentration of products.
the effect of stress on an equilibrium system.
9.
If an equilibrium is shifted to the left, the
concentrations of products will increase.
concentrations of reactants will increase.
synthesis reaction will be favored.
10.
For an equilibrium that has a Keq value less than one,
products are favored.
reactants are favored.
the products and reactants are present in equal amount.
11.
At equilibrium
the amounts of all products and reactants are equal.
the rates of forward and reverse reactions are equal.
the concentrations of all products and reactants are equal.
12.
If the pressure exerted on an equilibrium is increased, the equilibrium will
shift in the direction of the fewest gas particles.
shift in the direction of the more gas particles.
shift in the direction of the highest temperature.
13.
The reverse reaction of a given equilibrium is favored by an increase in temperature. If the reaction has red colored reactants and colorless products how will the appearance change when the system is heated?
It will become lighter.
It will become darker.
There will be no change.
14.
In the following reaction: 2HCl(g) H2(g) + Cl2(g) if the concentration of HCl is increased, the concentration of
H2 will increase
Cl2 will increase
both H2 and Cl2 will increas
15.
If the temperature of an exothermic reaction increases, the value of Keq will
increase.
decrease.
remain the same.
Check your     Another go?
 

   
 Quiz Results:
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  If you are having trouble with the quiz items you need to:
  
    Read the textbook.
     
    Do a more thorough job taking notes.
     
    Review missed answers on assignments.
     
    Get help from your teacher or classmates.
     
    Ask questions
in class.
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  Try the publisher's
practice tests.
    Test 1
    Test 2
    Test 3