Unit 5: Kinetics

Arrhenius constant

________, k, is based on the activation energy for a reaction and the temperature.

Collision theory

________ states reactions only occur when chemicals collide with each other with sufficient energy (activation energy)

First Order Rate Law

log[A]=-kt+ln[A]₀

Zero Order Rate Law

Rate=k

Second Order Rate Law

1/[A] = kt+ 1/[A]₀

Catalyst

A substance added to a reaction to speed it up

Intermediate

A substance created in one elementary step and used up in another

Half-life

How long it takes for half of a substance to decompose/be consumed

Half life equation

t= .693/k

Heterogenous Mixture

Not all parts of a mixture are equal, unevenly mixed

Homogenous Mixture

All parts of a mixture are equal, evenly mixed

Elementary Step

The steps that occur during a reaction

Activation energy

How much energy is required for a reaction to start/occur

high

A reaction will occur more if there is a ______ concentration of an aqueous or gaseous substance

lower

A reaction will occur less if the temperature is _____.

heterogeneous

stirring will help a reaction occur more if the mixture is _____

first

The half life equation can only be used for ____ order

negative

First and zero order graphs have a _____ slope

positive

Second order graphs have a _____ slope

First Order

Rate = k[A]

Second Order

Rate = k[A]²