Chemistry:
Paper 1 : What is a catalyst? (2)
My answer: A substance that lowers the activation energy in a reaction by providing an alternative reaction pathway. It isn't itself used up in the reaction.
Answer: It speeds up the reaction without being used.
Paper 2 : What is catalyst (2)
My answer: A substance that speeds up a reaction and isn't used in the reaction
Answer:A substance that lowers the activation energy in a reaction by providing an alternative reaction pathway. It isn't itself used up in the reaction.