Rates of reaction

Question 1

what is the collision theory? Fill in the gaps. In order for particles to react, they must _______ with eachother. In a successful collision, ______ turn into ________. This can only happen with enough _____. The minimum amount of _______ to create a successful reaction is called the __________ _________

Answer 1

Collide
Reactants
Products
Energy
Energy
Activation energy

Question 2

Name the 2 ways to measure rates of reaction

Answer 2

Measuring the products (eg. gas produced)

Measuring how quickly the reactants are used up

Question 3

how do you calculate rate of reaction?

Answer 3

Change in amount of reactant or product/change in time

Question 4

How does concentration/pressure effect the rate of reaction?

Answer 4

Increasing the concentration/pressure pushes the particles closer together causing more frequent successful collisions. It has no effect on the energy of the particles

Question 5

How does surface area effect rate of reaction?

Answer 5

A higher surface are leads to an increase in the rate of reaction as the larger the surface area, the more particles exposed meaning there are more frequent successful collisions. It has no effect on the energy of the particles.

Question 6

How does temperature effect rate of reaction?

Answer 6

An increase in temperature leads to an increase in rate of reaction. An increase in temperature leads to an increase of energy in the particles meaning they will move around quicker causing more frequent successful collisions. The increase in energy also means the activation energy is more commonly met leading to more frequent successful collisions

Question 7

what is an catalyst?

Answer 7

a substance that increases the rate of reaction whilst not being used up.

Question 8

explain an experiment to identify a catalyst

Answer 8

Measure the mass of the catalyst before the reaction
Do the experiment, once with the catalyst, once without.
If the reaction time with the catalyst is shorter than the reaction time without the catalyst, continue
(If not, it is not a catalyst)
Filter out the catalyst and leave to dry.
Weigh the catalyst again. If the mass has not changed, it’s a catalyst

Question 9

How do catalysts work?

Answer 9

Catalysts provide an alternative route for the reaction which has a lower activation energy

Question 10

How do catalysts affect the rate of reaction?

Answer 10

If you add a catalyst, you increase the rate of reaction as catalysts provide an alternative route opportunity the reaction which has a lower activation energy