C5.2

Question 1

Higher temperatures

Answer 1

Particles move at a faster rate so they collide more often and the greater proportion of particles have the activation energy or more

Question 2

Proportion

Answer 2

1/reaction time is directly proportional to rate of reaction

Question 3

Concentration/pressure

Answer 3

Particles become more crowded so collide more often = frequency of successful collisions increases

Question 4

Particle size

Answer 4

Greater the SA to volume ratio = more reactant particles available for collision therefore collisions are more likely = successful collisions increases (smaller objects = larger SA:V)

Question 5

Catalysts

Answer 5

Provide an alternative reaction pathway with a lower activation energy therefore a greater proportion of particles have the activation energy or more, increasing the frequency of successful collisions