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CHM 131 Lecture Notes - Lecture 14: Reaction Rate Constant, Reaction Rate, Rate Equation

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School
University of Rochester
Department
Chemistry
Course
CHM 131
Professor
Benjamin Hafensteiner

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Document Summary

Temperature affects rate by affecting the number and energy of collisions. So an increase in temperature will have the effect of increasing reaction rate. Consider the following reaction aa + bb products. Rate law: equation describing the relationship between the reaction rate and concentration of a reactant or reactants. Rate = k[a]m[b]n where k is called the rate constant. General form of rate law: rate = k[a]^m [b]^n. [a], [b] concentration, in m or p k rate constant; units vary m, n reaction orders. M, n are called reaction orders - they indicate the sensitivity of the rate to concentration changes of each reactant. An exponent of 0 means the reaction is zero order in that reactant - rate does not depend on the concentration of that reactant. An exponent of 1, rate is directly proportional to the concentration of that reactant. If concentration is doubled, rate doubles - reaction is first order in that reactant.

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Related Questions

Reaction Order

10

The rate of a chemical reaction depends on the concentrations ofthe reactants. For the general reaction between Aand B,

aA+bB?cC+dD

The dependence of the reaction rate on the concentration of eachreactant is given by the equation called the rate law:

rate=k[A]m[B]n

where k is a proportionality constant called the rateconstant. The exponent m determines the reaction orderwith respect to A, and n determines the reaction orderwith respect to B. The overall reaction order equals the sum of theexponents (m+n).

For the reaction A+B+C?D+E, the initial reaction rate wasmeasured for various initial concentrations of reactants. Thefollowing data were collected:

Trial [A]
(M)		 [B]
(M)		 [C]
(M)		 Initial rate
(M/s)
1 0.40 0.40 0.40 1.2

For the reaction A+B+C→D+E , the initial reaction rate was measured for various initial concentrations of reactants. The following data were collected:

Trial [A]
(M )		 [B]
(M )		 [C]
(M )		 Initial rate
(M/s )
1 0.20 0.20 0.20 6.0×10−5
2 0.20 0.20 0.60 1.8×10−4
3 0.40 0.20 0.20 2.4×10−4
4 0.40 0.40 0.20

2.4×10−4

The rate of a chemical reaction depends on the concentrations of the reactants. For the general reaction between A and B ,

aA+bB⇌cC+dD

The dependence of the reaction rate on the concentration of each reactant is given by the equation called the rate law:

rate=k[A]^m[B]^n

where k is a proportionality constant called the rate constant. The exponent m determines the reaction order with respect to A , and n determines the reaction order with respect to B . The overall reaction order equals the sum of the exponents (m+n ).

Part A

What is the reaction order with respect to A ?

Express your answer as an integer.

Part B

What is the reaction order with respect to B ?

Express your answer as an integer.

Part C

What is the reaction order with respect to C ?

Express your answer as an integer.