Which answer determines the energy the reactant molecules must achieve for a reaction to occur?
average kinetic energy of products
activation energy
difference between the energies of products and reactants
average kinetic energy of reactants

Evaporation: this is when warmth from the sun causes water from oceans, lakes, streams, ice and soils to rise into the air and turn into water vapour (gas). water vapour droplets join together to make clouds! condensation: this is when water vapour in the air cools down and turns back into liquid water.

Idon't know hope someone you