How far how fast + errors

First order’s rate constant from graph

Ln(2) / half time

In first order, half life…

half life stays constant

In zero order, half life..

Half life decreases

In 2nd order, half life…

Half life increases

Overall order

Sum of orders of reactants

First order concentration graph

Zero order concentration graph

Second order concentration graph

Kp only changes when…

Temperature changes

Why would you add a large excess of a reactant you are not investigating the rate of in an experiment

So that the order of reaction to that reactant is (essentially) zero

how to find activation energy using a converted arhemmius equation graph

( change in ln k as ln k / changee in 1/t as 1/t) x negative gas constant

how to know if reaction is zero order with respect to reactant from concentration / time graph (2)

straight line graph will show that the rate is constant throughout / concentration does not affect rate of reaction

half life will be constant

how to control concentrations by dilution (4)

• mix (constant volume) of reactnats

• dilute each solution in turn with water

• only one solution changed at a time

• total volume remains the same

How do we know something ISNT a catalyst

are consumed / used up

are in overall reaction

are not regenerated / reformed

Reasons a reaction may take place in more than one step

Rate equation does not match overall equation

Collisions unlikely with more than 2 ions / species / particles