AnswersChemistryRate Laws

Rate Laws — Quiz Answers

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Which situation is appropriate for using rate laws?

A
to see how fast hydrogen peroxide decomposes into water and oxygen
B
to determine the moles of nitrogen that are produced from a reaction between nitrogen monoxide and hydrogen
C
to determine the order of reaction from the products in a chemical equation
D
to determine the products of the decomposition of dinitrogen tetroxide gas
2
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Consider the reaction and the rate law. 2 cap o sub 3 rightarrow 3 cap o sub 2 cap r is equal to k times open bracket cap o sub 3 close bracket squared What is the overall order of the reactants in this rate law?

A
0
B
1
C
2
D
3
3

Which is a reason to use rate laws?

A
to find the new rate when the concentration of reactants changes
B
to find the number of moles of solute that are dissolved in 1 liter of solution
C
to calculate the molecular weight of compounds in a reaction
D
to investigate how the pressure of liquids affects reaction rates
4

A chemist is studying the effect of acid rain on the steel in bridges. Why would she most likely use rate laws in this study?

A
to see how much of the steel reacts with the acid rain
B
to determine how much the color of the steel bridge has changed
C
to determine how much weight the steel bridge can now hold
D
to see how the concentration of the acid would affect the rate at which the steel corroded
5

The reaction rate between reactants cap z and cap y is proportional to the cube of cap z What is the rate law for this reaction?

A
cap r is equal to k cap z cubed cap y
B
cap r is equal to k cap z 3 cap y
C
cap r is equal to k 3 cap z cap y
D
cap r is equal to k cap z cap y cubed
6

Consider the rate law. cap r is equal to k cap A cap b squared Which step would quadruple the rate?

A
doubling the concentration of both cap A and cap b
B
doubling the concentration of cap A
C
doubling the concentration of cap A but halving the concentration of cap b
D
doubling the concentration of cap b
7

Consider the rate law. cap r is equal to k open bracket open paren CH sub 3 close paren sub 3 CBr close bracket to the 1th power open bracket cap h sub 2 cap o close bracket to the 0 power What is the overall order of the reactants in this reaction?

A
0
B
1
C
2
D
3
8

What is the primary purpose of a rate law?

A
to show a relationship between the amounts of gas that can dissolve into a liquid
B
to show the relationship between the concentration of reactants and the reaction rate
C
to determine if a chemical reaction will be exothermic or endothermic
D
to determine the amount of product that is formed from the concentration of reactants
9

Consider the rate law. cap r is equal to k times cap A squared What effect does doubling the concentration have on the rate?

A
triples the rate
B
quadruples the rate
C
no effect on the rate
D
doubles the rate
10

The equation shows a reaction that is second order in cap A and first order in cap b 2 cap A g plus cap b times g rightarrow cap c times g What is the rate law for the reaction?

A
cap r is equal to k times AB squared
B
cap r is equal to k cap A cap b squared
C
cap r is equal to k times 2 AB
D
cap r is equal to k cap A squared cap b

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