Oxford Revise AQA GCSE Combined Science Foundation | Chapter C6 answers

C6: Chemical reactions

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Mark

AO / Specification reference

01.1

pH probe/(universal) indicator

1

AO1

5.4.2.4

01.2

hydrochloric acid – 1

sodium hydroxide – 14

1

1

AO1

5.4.2.4

01.3

neutralisation

1

AO3

5.4.2.4

01.4

hydrogen ions

hydroxide ions

water

one mark for one correct

two marks for all correct

2

AO1

5.4.2.4

01.5

hydrochloric acid – chloride

nitric acid – nitrate

sulfuric acid – sulfate

1

1

1

AO1

5.4.2.2

02.1

reduced

loses oxygen

1

1

AO1

5.4.1.3

02.2

2Fe2O3 + 3C → 4Fe + 3CO2

1

AO2

5.4.1.3

02.3

gold is unreactive

so is found as elemental gold in the Earth

1

1

AO1

5.4.1.3

03.1

corrosive

irritant

environmental hazard

1

1

1

AO1

5.4.2.3

03.2

18 cm3

1

AO3

5.4.2.3

03.3

wear splash-proof goggles/safety glasses

wash hands before touching eyes/face

1

1

AO3

5.4.2.3

03.4

leave solution in basin on side

accept place the dish on top of a beaker containing some water

1

AO3

5.4.2.3

04.1

aluminium – electrolysis

gold – found as pure metal

iron – reduction with carbon

1

AO1

5.4.1.3

04.2

oxygen

1

AO1

5.1.1.1

04.3

carbon

carbon dioxide

1

1

AO2

5.4.1.3

04.4

reduced

copper loses oxygen or copper gains electrons

1

1

AO1

5.4.1.3

05.1

zinc and copper chloride solution

1

AO2

4.4.1.2

05.2

hydrogen

1

AO1

4.1.2.5

05.3

less vigorously

1

AO1

5.1.2.5

05.4

lithium chloride + copper

1

AO2

5.4.1.2

05.5

sodium > lithium > zinc > copper

one mark for one correct

two marks for two correct

three marks for all correct

3

AO2

5.4.1.2

06.1

magnesium sulfate + waster

hydrochloric acid, hydrogen

potassium, nitrate

1

1

1

AO1

5.4.2.2

06.2

CaCO3 + H2SO4 → CaSO4 + CO2 + H2O

one mark for reactants

one mark for products

2

AO2

5.4.2.2

06.3

sodium sulfate

1

AO2

5.4.2.4

06.4

2 cm3

1

AO3

5.4.2.4

07.1

dissolves

1

AO1

5.4.2.3

07.2

top pan balance/mass balance/balance

1

AO1

5.4.2.3

07.3

measuring cylinder (D)

1

AO1

5.4.2.3

07.4

remove excess solid/zinc oxide

1

AO3

5.4.2.3

07.5

zinc chloride

1

5.4.2.2

07.6

zinc chloride + water

allow error carried forwards from question 07.5

1

AO3

5.4.1.2

08.1

(C) > B > D > A

one mark for one correct

two marks for all correct

2

AO3

5.4.1.2

08.2

A

1

AO3

5.4.1.2

08.3

C

1

AO3

5.4.1.2

08.4

Na ion is drawn with 1 shell with 8 dots, inside square brackets with a superscript + to the right of the brackets

1

AO2

5.2.1.2

08.5

2Na + 2H2O → 2NaOH + H2

one mark for reactants and products

one mark for balancing

2

AO2

5.1.2.5

08.6

sodium is more reactive than calcium

sodium forms positive ions/loses electrons more readily than calcium

1

1

AO2

5.4.1.2

09.1

lithium

1

AO2

5.4.1.2

09.2

magnesium oxide

1

AO2

5.4.1.1

09.3

oxidised

magnesium has gained oxygen/lost electrons

1

1

AO1

AO2

5.4.1.1

09.4

magnesium is more reactive than carbon

therefore, carbon cannot displace magnesium from magnesium oxide

1

1

AO1

5.4.1.3

10.1

pH probe

universal/broad range indicator

1

1

AO1

5.4.2.4

10.2

A

1

AO1

5.4.2.4

10.3

E

1

AO1

5.4.2.4

10.4

B

1

AO2

5.4.2.4

10.5

increases

1

AO2

5.4.2.4

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