Chapter 14: Chemical Kinetics Flashcards
Four important factors which affect the rate of reaction
Reactant concentration
Temperature
Action of catalyst
Surface area
Reaction rate
Change in concentration (M) per unit time (s)
There are two ways of measuring rate
Speed at which products appear (change in miles of b per unit time)
Or
Speed at which reactants disappear (change in miles of a per unit time)
Average rate=
-change in moles of a/ change in time
Or positive b
Reaction rate is given by
-1/a (change in concentration of a/ change in time) = 1/b (change in concentration of b/ change in time)
Rate laws
Show if and how the rate of a reaction depends on the initial concentration of the reactants
Rate law expression
Rate= k [A]^m [B]^n
m and n are reaction orders
K is the arhenious constant or rate constant
If the concentration of a is doubled and the rate doubles
First order
If the concentration of a doubles and the rate quadruples
Second order
If the concentration of a triples and the rate triples
First order
If the concentration of a is triples and the the rate increases by a factor of 9
Second order
Straight line with a negative slope=
1st order
A first order reaction depends on
The concentration of one reactant raised to the first power
A second order reaction depends on the
Concentration of one reactant raised to the second power. Or, two reactants raised to the first power
Positive line
Second order
