CH0002 - Lecture 4

The amount of time it takes for a quantity to fall to half its value as measured at the beginning of the time period

It doubles every time

d[A]/dt = -k[A]

[A] = [A]₀ exp(-kt)

Or, eqivalently

ln[A] = ln[A]₀ - kt

t_1/2 = ln(2)/k

• Rate will increase with temperature because...
• 1. Molecules will be traveling at greater speeds.
• 2. More molecules have enough energy to react.