00:02
Hi there.
00:03
In this question, we are trying to describe a catalyst.
00:09
So we want to select all of the statements that describe a catalyst.
00:15
So the first one, probably the most important part of a definition of a catalyst, well, maybe not the most important, but a very important part is that a catalyst is not changed during the reaction.
00:27
It is not used up.
00:28
It is not changed.
00:30
It's still available after the reaction.
00:32
So the first one, is correct.
00:38
Catalyst themselves, they're not part of the reaction.
00:41
They're not used up during the reaction or changed in any way.
00:45
All right, the next one.
00:46
Catalysts speed up reactions, and they do this by lowering the activation energy.
00:52
So the second one is correct.
00:55
The third one increases the rate of exergonic reactions.
01:00
So exergonic or even spontaneous reactions still have activation energy...