A reaction between two particles cannot happen unless the particles have enough __ when they collide. What is the missing word? Enter your answer

## Step 1:The statement in the problem is "A reaction between two particles cannot happen unless the particles have enough when they collide."## Step 2:For a reaction to occur, particles must collide with sufficient energy to overcome the activation energy barrier.## Step 3:The missing word should describe the minimum energy required for the reaction to proceed.## Step 4:The correct term for the minimum energy required for a reaction to occur is "activation energy."