1
Q
Relative Atomic Mass
A
The RAM of an element is the average mass of its atoms compared to a 12th of a carbon 12 atom
2
Q
Activation Energy, Ea
A
The minimum energy which particles need to collide to start a reaction
3
Q
Rate of reaction
A
The change in concentration of a substance in unit time ( usual unit mol dm -3 s-1)
AQA A-level Chem
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