4.1.5 - Effect Of Catalysts

Question 1

What are CATALYSTS!?

Answer 1

. Catalysts are substances (usually solid) which:
- increase rate
- remain chemically unchanged

Question 2

How do CATALYSTS work !?

Answer 2

. They provide an alternative route with lower activation energy

. So the percentage of collisions with enough energy is higher

. So there are more successful collisions per unit time

Question 3

What Experiment can be used to demonstrate the effect of a CATALYST on RATE !?

Answer 3

. Hydrogen peroxide experiment:
- the effect of a catalyst on rate can be demonstrated using the decomposition of hydrogen peroxide

Question 4

Observations made when observing HYDROGEN PEROXIDE Experiment:

Answer 4

. This reaction is normally very slow, taking days to finish
- it is catalyses by manganese oxide, which is a black⬛️ solid. This causes it to take place much faster, taking only a few seconds

Question 5

INPUT Variable in the HYDROGEN PEROXIDE Experiment:

Answer 5

. Which catalyst is used

Question 6

OUTPUT Variable in the HYDROGEN PEROXIDE Experiment:

Answer 6

. Volume of Oxygen (gas)

Question 7

CONTROL Variables in the HYDROGEN PEROXIDE Experiment:

Answer 7

. Volume of Hydrogen Peroxide

. Temperature

. Mass and surface area of catalyst

Question 8

Results of HYDROGEN PEROXIDE Experiment m, (on a graph):

Answer 8

. Most effective catalysts increase rate more effectively.
-this results in a steeper line on a graph

Question 9

How do you create OXYGEN in the lab!?

Answer 9

. Decomposition of Hydrogen Peroxide