According to collision theory, what must the molecules of reactants do in order for a reaction to occur?

A) Collide
B) Heat up
C) Be pressurized
D) Expand

Reactant Molecules

Reactants present at the onset of a chemical reaction, which are transformed to create the resulting compounds.

Reaction Occurrence

Refers to the event in which reactants transform into products during a chemical reaction.

Collide

To come into forceful contact with another object, often resulting in a transfer of energy or a physical change.