Paper 1: Section 2- States of matter and mixture

Question 1

What is evaporating?

Answer 1

Liquid — gas

Question 2

What is condensing?

Answer 2

Gas — liquid

Question 3

What is melting?

Answer 3

Solid — liquid

Question 4

What is freezing?

Answer 4

Liquid — solid

Question 5

When a solid turns straight into a gas on heating, without becoming a liquid first.

Answer 5

Sublimation

Question 6

When a gas turns straight into a solid, without becoming a liquid.

Answer 6

Deposition

Question 7

What is the chemical definition of purity?

Question 8

Why isn’t air considered a pure substance?

Question 9

If a substance melts over a range of temperatures, is it a pure or mixed substance?

Question 10

What is simple distillation?

Question 11

What is the purpose of filtration?

Question 12

What is the purpose of crystillation?

Question 13

What is chromatography?

Question 14

How do you calculate the RF value?

Question 15

.

Question 16

.

Question 17

What is potable water?

Question 18

What is surface water?

Question 19

What is ground water?

Question 20

What is waste water?

Question 21

What are the 3 stages of water purification?

Answer 21

. Filtration
. Sedimentation
. Chlorination

Question 22

What is Filtration?

Question 23

What is sedimentation?

Question 24

What is chlorination?

Question 25

How do some very dry countries produce potable water?

Question 26

What is deionised water and when is it used?