SC18c Catalysts and Activation Energy

Question 1

catalyst?

Answer 1

a substance that speeds up chemical reactions without being used up

Question 2

3 things about catalysts?

Answer 2

~do not alter the products of the reaction
~they are not changed chemically at the end of the reaction
~mass of catalyst is the same before and after the reaction

Question 3

enzymes?

Answer 3

protein molecules produced by living organisms that act as catalysts in biological reactions

Question 4

active site?

Answer 4

each enzyme molecule has a part with a specific shape that only fits ones substrate

Question 5

substrate (reactant molecule?

Answer 5

fit the shape of the active site

Question 6

what can cause an enzyme to denature?

Answer 6

~temperature
~pH

Question 7

denature?

Answer 7

change the shape of active site so the substrate no longer fits

Question 8

use of enzymes and what happens?

Answer 8

fermentation (make alcoholic drinks) - enzyme catalyses the reaction in which glucose is converted into ethanol (alcohol) and carbon dioxide

Question 9

how do catalysts work?

Answer 9

they provide an alternate reaction route, which needs less activation energy

Question 10

what do catalysts cause?

Answer 10

as less energy is needed to start the reaction, more reactant molecules have enough energy so more collisions are successful.