AnswersChemistryReaction Rates and Equilibrium

Practice Test Answers

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1
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Which statement best describes the use of catalytic converters in automobiles?

A
They oxidize hydrocarbons to form less toxic gases.
B
They decrease the rate of the reactions that produce harmful gases.
C
They combine the larger hydrocarbon molecules with smaller ones.
D
They increase reaction temperature for cleaner burning.
2
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Which statement is usually true about the relationship between activation energy and reaction rates?

A
Low activation energy barriers result in low rates.
B
High activation energy barriers result in low rates.
C
Low activation energy barriers result in no reaction.
D
High activation energy barriers result in no reaction.
3

Which definition describes activation energy?

A
the diagram showing a change in energy between reactants and products
B
the minimum energy that a set of reactants must attain before reaction can occur
C
the short-lived, high-energy intermediate between reactants and products
D
the speed at which reactants form products in a chemical reaction
4

In the hypothetical reaction below, substance cap A is consumed at a rate of 2 point 0 times mol over cap l times s If this reaction is at dynamic equilibrium, at what rate will substance cap b be consumed? cap A sub long left right arrow cap b

A
4 point 0 times mol over cap l times s
B
2 point 0 times mol over cap l times s
C
1 point 0 times mol over cap l times s
D
0 point 0 times mol over cap l times s
5

Consider this chemical reaction of bromothymol blue indicator. It appears yellow in undissociated form and blue in its dissociated aqueous solution. Expand Image What will be the color of the solution if a large amount of cap h sub 2 CO sub 3 is added?

A
The solution will remain yellow.
B
The solution will turn blue.
C
The solution will turn green.
D
The solution will turn pink.
6

According to Le Chatelier’s principle, a change in pressure affects the chemical equilibrium of the reaction system under what condition?

A
Some of the reactants or the products are solid, and some are liquid.
B
The reactants and the products are in the liquid phase.
C
Some of the reactants or the products are in the gaseous phase.
D
The reactants and the products are in the solid phase.
7

Consider the rate law. cap A plus 3 cap b rightarrow 2 cap c plus 2 cap d The rate increases by a factor of 9 when the concentration of cap A triples.The rate triples when the concentration of cap b triples. What is the new rate law for the reaction?

A
cap r is equal to k cap A squared cap b
B
cap r is equal to k cap A to the 9th power cap b cubed
C
cap r is equal to k cap A cubed cap b cubed
D
cap r is equal to k cap A cubed cap b squared
8

What advantage does a heterogeneous catalyst provide over a homogeneous catalyst in industrial processes?

A
A heterogeneous catalyst provides a higher reaction rate.
B
A heterogeneous catalyst raises the activation energy higher.
C
A heterogeneous catalyst can be easily separated from reactants.
D
A heterogeneous catalyst provides an alternate reaction pathway.
9

Which statement best describes why rate laws are important?

A
to see how much heat energy a chemical reaction releases
B
to see if a chemical reaction can actually take place
C
to determine how fast a chemical reaction will take place
D
to determine what products are formed in a chemical reaction
10

Which is true about reaction rates?

A
High reaction rates occur only in spontaneous reactions.
B
Low reaction rates occur only in nonspontaneous reactions.
C
Reaction rates are not dependent on high or low activation energies.
D
Reaction rates are not related to spontaneity.
11

Which kind of reaction does this graph represent?

A
exothermic because triangle cap h sub rxn is equal to negative 1 comma 099 point 6 kJ
B
endothermic because triangle cap h sub rxn is equal to 876 point 8 kJ
C
endothermic because triangle cap h sub rxn is equal to negative 876 point 8 kJ
D
exothermic because triangle cap h sub rxn is equal to 1 comma 099 point 6 kJ
12

What is the value of the equilibrium constant for this reaction in correct scientific notation?

A
4 point 9 times 10 cubed
B
4 point 9 times 10 inverse
C
4 point 9 times 10 to the negative 2 power
D
4 point 9 times 10 to the negative 3 power

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