Rates of Reaction

Question 1

Reaction Rate

Answer 1

The change in concentration per unit time of either a reactant or product

Question 2

Factors affecting the rate of chemical reactions

Answer 2

Nature of reacting substances, surface area (solid), concentration (solution), pressure (gas), temperature and catalyst

Question 3

Collision theory

Answer 3

Particles collide with sufficient energy (activation energy) to break old bonds in the right orientation to form new bonds.

Question 4

Measuring rates of reactions

Answer 4

Measuring gas volumes, turbidity (precipitate formation), change of colour and the change of the mass of the reaction vessel

Question 5

Catalyst

Answer 5

A substance that increase the rate of reaction but remains unchanged at the end of the reaction

Question 6

How do catalysts function?

Answer 6

Some catalysts function by interacting with the reactants in such a way that the reaction follows an alternate path of lower activation energy