What are catalysts?
1 mark · EasyState what a catalyst does in a chemical reaction.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
Speeds up a chemical reaction without being used up.
Also accept: A catalyst increases the rate of a reaction and is not used up.; A catalyst speeds up a reaction and is unchanged at the end.
Common mistakes: Saying only that a catalyst 'helps' or is 'involved' without mentioning rate or that it is unchanged.
Show mark scheme and worked solution
Marking points
B1 · 1 mark · Identifies that a catalyst speeds up a reaction and is not used up.
Worked solution
A catalyst speeds up a chemical reaction without being used up in the process.