Rates of Reaction

Question 1

Temperature

Answer 1

Heating a substance makes its particles move more rapidly and collide more rapidly. This causes the rate of reaction to increase, as bonds between the particles are broken and new ones are more easily formed with the particles.

Question 2

Concentration

Answer 2

Increasing the concentration will mean there are more particles, there are more collisions and therefore a higher reaction rate.

Question 3

Stirring

Answer 3

By stirring or mixing, the products of the reaction will be removed and replaced with more particles of reactants, this will maintain the rate of reaction.

Question 4

Surface Area

Answer 4

An increase in the surface area (Can be done by breaking a substance into smaller pieces) provides a larger surface area on which reactions can occur, this causes an increase in the rate of reaction

Question 5

Catalyst

Answer 5

A catalyst is a chemical that can speed up a chemical reaction but is still present once the reaction has finished. The catalysts in living things are called enzymes. Enzymes in the human body help to break down food and make important chemicals such as proteins.

Question 6

Collision theory

Answer 6

The reactants must collide with enough energy and the correct orientation