Kinetics (Year 1)

Question 1

What do reactions need in order to take place?

Answer 1

Particles must collide with sufficient energy
(activation energy)

Question 2

Define activation energy

Answer 2

Minimal energy that particles must collide with for a reaction to occur

Question 3

What is the effect of increasing temperature on rate of reaction?

Answer 3

Increases rate of reaction
Higher proportion of particles have sufficient energy to react
More successful collisions

Question 4

What is the effect of increasing concentration / pressure on rate of reaction?

Answer 4

Increased rate of reaction
More particles in a given volume
More frequent successful collisions

Question 5

What is a catalyst?

Answer 5

Substance that increases rate of reaction but remains unchanged

Question 6

How do catalysts work?

Answer 6

Provides alternative reaction pathway with a lower Ea
Lowers Ea so more particles are able to react

Question 7

What is the x-axis labelled as on the Maxwell-Boltzmann distribution curve?

Answer 7

Number of molecules