chemistry paper 2 sparx science

Question 1

why were there no oceans on the Earth’s surface billions of years ago?

Answer 1

the earth’s surface was hot

Question 2

what element needs to be in the impurities for sulphur dioxide to be produced?

Answer 2

sulfur

Question 3

what is fertilisers an example of?

Answer 3

a formulation

Question 4

is a
- piece of magnesium metal
- a solution of sodium chloride and water
- a sample of air

chemically pure or a mixture?

Answer 4

piece of magnesium metal - chemically pure

a solution of sodium chloride and water – mixture

a sample of air – mixture

Question 5

what are the 2 tests for CO2?

Answer 5

1. turns limewater milky
2. it would extinguish a lit splint

Question 6

What happens when 2 particles collide?

Answer 6

They will only react if they have enough energy

Question 7

Describe the boiling point of gases in the earth’s atmosphere and their structure

Answer 7

Have low boiling points and are simple molecular structures

Question 8

How do you increase the rate of reaction for solids, liquids and gases?

Answer 8

Increase the surface area of solid reactants
Increase the concentration of solutions
Increase the pressure of reactants that are gases