What name is given to the minimum amount of energy needed by particles for them to react when they collide? 1)threshold energy
2) activation energy
3) catalytic energy

Activation

Explanation:

2. Activation energy

Explanation:

activation energy is the minimum amount of energy that must be provided to compounds to result in a chemical reaction.[1] The activation energy (Ea) of a reaction is measured in joules per mole (J/mol), kilojoules per mole (kJ/mol) or kilocalories per mole (kcal/mol). Activation energy can be thought of as the magnitude of the potential barrier (sometimes called the energy barrier) separating minima of the potential energy surface pertaining to the initial and final thermodynamic state