GCSE CHEMISTRY HIGHER AQA PAPER 1 MAY 2018 - Unofficial mark scheme

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polok
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For many people, here is the answers for the may 2018 aqa paper

1.1 Give one other type of substance that can react with an acid to form a soluble salt.
answer: metal (carbonate)

1.2 Give the formula of calcium nitrate.
answer: Ca(NO3)2

1.3 Describe a method to make pure, dry crystals of magnesium sulfate from a metal oxide and a dilute acid.
answer: • use magnesium oxide and sulfuric acid • add sulfuric acid to a beaker • warm sulfuric acid • add magnesium oxide • stir • continue adding until magnesium oxide is in excess

• filter • using a filter paper and funnel • to remove excess magnesium oxide

• heat solution in an evaporating basin • to crystallisation point • leave to crystallise • pat dry with filter paper

2.1 Determine the formula of iron pyrites.

answer:FeS2
2.2 Give the number of protons, neutrons and electrons in this atom of iron.
answer:
26
30
26
2.3 Give two differences between the properties of iron and sodium
answer: • iron has a high(er) melting / boiling point • iron is dense(r) • iron is hard(er)
• iron is strong(er) • iron is less reactive
• iron has ions with different charges • iron forms coloured compounds • iron can be a catalyst
2.4 Explain why carbon can be used to extract nickel from nickel oxide
answer: carbon is more reactive (than nickel)
(so) carbon will displace / replace nickel (from nickel oxide) or (so) carbon will remove oxygen (from nickel oxide)

2.5 Calculate the percentage atom economy for the reaction to produce nickel.
Relative atomic masses (Ar): C = 12 Ni = 59
Relative formula mass (Mr): NiO = 75

Give your answer to 3 significant figures.

answer: 67.8

3.1
Which of these combinations would not give a zero reading on the voltmeter in Figure 2?
answer: C

3.2
Why do alkaline batteries eventually stop working?
answer: reactant used up
3.3 Why can alkaline batteries not be rechargeable answer: it is irreversible 3.4
Complete the balanced equation for the overall reaction in a hydrogen fuel cell. answer:
2H2 + O2 → 2H2O


https://www.dropbox.com/s/77k4qxajk4...18-AM.pdf?dl=0
https://www.dropbox.com/s/8bcwbiagi0...-v1.1.pdf?dl=0
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natgamer
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Molly Dolding
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(Original post by natgamer)
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