Topic 3 States of matter separating and purifying

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

Front (Question)

1 What are the three states of matter?

Back (Answer)

solid, liquid, gas

Front (Question)

2 In which state are the particles arranged regularly?

Back (Answer)

solid

Front (Question)

3 In which state do particles move quickly in all directions?

Back (Answer)

gas

Front (Question)

4 What state change happens when a substance melts?

Back (Answer)

solid to liquid

Front (Question)

5 What state change happens when a substance condenses?

Back (Answer)

gas to liquid

Front (Question)

6 In general, which state of matter has particles with the highest energy?

Back (Answer)

gas

Front (Question)

7 What is the melting point of water in °C?

Back (Answer)

0 oC

Front (Question)

8 What is the boiling point of water in °C?

Back (Answer)

100 oC

Front (Question)

9 When a substance is melted, is energy transferred to or from the surroundings?

Back (Answer)

from (The substance gains energy from the surroundsing)

#10

Front (Question)

10 The melting point of sodium is 97.7 °C. What is the state of sodium at 25.0 °C?

Back (Answer)

solid (The temperature is below the melting point, so it hasnt yet melted!)

#11

Front (Question)

11 Gold is a pure substance. T or F?

Back (Answer)

true (although you can get alloys of gold which are mixtures and not pure substances)

#12

Front (Question)

12 Air is a mixture. T or F?

Back (Answer)

true (it is mixture mostly of the elements Nitrogen (N2) and Oxygen (O2))

#13

Front (Question)

13 Carbon dioxide is a mixture. T or F?

Back (Answer)

false (it is a compound of carbon and oxygen)

#14

Front (Question)

14 Pure substances only have one type of atom present T or F?

Back (Answer)

false (you can get pure compounds e.g. you can get pure salt, NaCl)

#15

Front (Question)

15 All mixtures are made up of compounds. T or F?

Back (Answer)

false (you can get a mixture of elements, for example air)

#16

Front (Question)

16 Pure substances have a sharp melting temperature. T or F?

Back (Answer)

true (as opposed to mixtures which melt over a temperature range)

#17

Front (Question)

17 A metal alloy is likely to melt over a range of temperatures. T or F?

Back (Answer)

true (because it is a mixture)

#18

Front (Question)

18 The temperature changes as a pure substance melts. T or F?

Back (Answer)

false (the temperatue stays constant as the energy is used to change state (break bonds))

#19

Front (Question)

19 When a substance melts, its particles move around and become less ordered. T or F?

Back (Answer)

true

#20

Front (Question)

20 A heating curve with an upward sloping gradient during melting indicates a pure substance is present. T or F?

Back (Answer)

false (for a pure substance the heating curve is flat during a state change)

#21

Front (Question)

21 What is a mixture?

Back (Answer)

different elements and/or compounds that are not chemically joined together

#22

Front (Question)

22 Which is a mixture, air or water or both?

Back (Answer)

air (as long as the water is pure water)

#23

Front (Question)

23 Which of a ‘mixture’ or a ‘pure substance’ has a fixed composition?

Back (Answer)

pure substance

#24

Front (Question)

24 Name a pure substance.

Back (Answer)

any suitable e.g. gold, salt, water can all be pure