half lives Flashcards
1
Q
what is meant by half life?
A
time taken for concentration to halve
2
Q
give 2 examples of when half life is constant
A
- radioactive decay
- pharmacokinetics of some drugs
3
Q
describe the half life of a first order reaction
A
remains constant
4
Q
describe the half life of a second order reaction
A
increases as concentration decreases
5
Q
describe the half life of a zero order reaction
A
decreases as concentration decreases