Activation energy

Chemical reactions, including exothermic ones, need energy to start. Successful reactions occur when colliding particles have at least the activation energy required.

What is a fundamental requirement for any chemical reaction to occur?

• Low pressure

• Presence of a catalyst

• Energy input

• High temperature

Why do even highly exothermic reactions need energy to start?

• To decrease pressure

• To increase the temperature

• To change the state of reactants

• To overcome activation energy

What must particles have to successfully react upon collision?

• Sufficient activation energy

• A catalyst present

• High velocity

• Low mass

What happens when particles collide without enough energy?

• They form a new compound

• They bounce off each other

• They release energy

• They change color

Which of the following is true about activation energy?

• It is the energy released during a reaction

• It is the energy that decreases the reaction rate

• It is the minimum energy required for a reaction to occur

• It is the energy absorbed by the products