CHEMICAL CHANGE: RATE OF REACTION

Question 1

Reaction rate

Answer 1

The change in concentration of reactants or products per unit time.

Question 2

The change in concentration of reactants or products per unit time.

Answer 2

A model that explains reaction rate as the result of particles colliding with a certain minimum energy.

Question 3

A model that explains reaction rate as the result of particles colliding with a certain minimum energy.

Answer 3

A substance that increases the rate of a chemical reaction without itself undergoing a permanent change. (A catalyst increases the rate of a reaction by providing an alternative path of lower activation energy. It therefore decreases the net/total activation energy.)

Question 4

Factors that affect reaction rate

Answer 4

Nature of reacting substances, surface area, concentration (pressure for gases), temperature and the presence of a catalyst.