Unit 5: Kinetics Flashcards
(21 cards)
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
