Kinetics

Question 1

Rate of reaction =

Answer 1

Change in concentration/time taken for change to happen

Question 2

Activation energy

Answer 2

The minimum kinetic energy that colliding molecules must possess for the collision to be successful and result in the formation of product molecules

Question 3

What does a catalyst do?

Answer 3

It speeds up a reaction by providing an alternative path with a lower activation energy

Question 4

The 3 requirements of collision theory

Answer 4

Particles must collide to react, reactants must possess a certain minimum amount of energy (the activation energy), and particles must collide with the correct orientation (steric effect)

Question 5

6 ways to increase rate

Answer 5

Increase surface area of solids, increase temperature, shine light, add catalyst, increase pressure of gases, increase concentration of reactants

Question 6

Homogeneous

Answer 6

In the same state

Question 7

Heterogeneous

Answer 7

In different states

Question 8

Enzymes

Answer 8

Biological catalysts

Question 9

5 measurable physical changes

Answer 9

Time taken to produce a certain volume of gas, time taken to produce enough solid to hide a cross, change in colour (measured using a colorimeter or light sensor), change in pH, and change in electrical conductivity (more ions = more conductivity)