Paper 1 physical Chemistry

Question 1

definition of endothermic

Answer 1

a reaction that takes in energy (cold)

Question 2

definition of exothermic

Answer 2

a reaction that gives out energy (hot)

Question 3

what type of reaction is breaking bonds

Answer 3

endothermic

Question 4

what type of reaction is forming bonds

Answer 4

exothermic

Question 5

formula for rate of reaction

Answer 5

amount of reactant used OR amount of product formed / time

Question 6

name two reversible reactions

Answer 6

hydration/dehydration of copper (II) sulphate

effect of heat on ammonium chloride

Question 7

describe the reversible reaction of copper (II) sulphate

Answer 7

when hydrated is it blue
if you heat it, the water evaporates and it turns white
if you add water again, they turn blue

Question 8

describe the reversible reaction of ammonium chloride

Answer 8

ammonium chloride is a white solid
when heated, it breaks down into ammonia gas and hydrogen chloride gas
if the gases are cooled together, they will react to reform ammonium chloride solid