1.5 Kinetics

Question 1

What must particles do in order to react

Answer 1

Collide with sufficient energy (activation energy) and the correct orientation

Question 2

Do most collisions result in a reaction

Answer 2

No

Question 3

Define activation energy

Answer 3

The minimum energy that particles must collide with for a reaction to occur

Question 4

What is the effect of increasing temperature on RoR? Why?

Answer 4

Increasing temperature - increased RoR —> Much higher proportion of particles have energy greater than the activation energy —> Many more successful collisions per second —> increased rate

Question 5

What is the effect of increasing pressure / concentration on RoR? Why?

Answer 5

Increased concentration / pressure —> increased RoR —> there are more particles in a given volume —> more frequent successful collisions —> increased rate

Question 6

What is a catalyst

Answer 6

A substance which increases the RoR but is not used up in the reaction

Question 7

How do catalysts work and how do they increase RoR

Answer 7

Provide an alternative pathway for the reaction with a lower activation energy
Lowers activation energy, so more particles have energy > activation energy, so more frequent successful collisions, so increased reaction rate