Rearranging atoms — Question Bank (Cambridge) — Cambridge IGCSE Physics 0625 Revision Notes & Topical Questions

Cambridge Lower Secondary Stage 9

Question 1
Paper Ref: 0620/21_Winter_2023_Q7

Which row shows the formulae of sodium carbonate, zinc nitrate and ammonium sulfate?
— sodium carbonate zinc nitrate ammonium sulfate

Options:
A
B
C
D
Correct Key: B

Question 2
Paper Ref: 0620/21_Summer_2022_Q9

The equation for the reaction between aqueous lead(II) nitrate and aqueous sodium chloride is
shown.
Pb(NOs3)2(aq) + 2NaCl(aq) > PbCi2(s) + 2NaNO₃;(aq)
If 100cm? of aqueous lead(II) nitrate of concentration 0.1 mol/dm? is reacted with an excess of
aqueous sodium chloride, which mass of lead(II) chloride is obtained?
A 1.169 B 242g C 278g D 331g

Options:
A
B
C
D
Correct Key: C

Question 3
Paper Ref: 0620/13_Summer_2017_Q12

Which statements about exothermic and endothermic reactions are correct?
1 During an exothermic reaction, heat is given out.
2 The temperature of an endothermic reaction goes up because heat is taken in.
3 Burning methane in the air is an exothermic reaction.
A 1,2and3 B tand2only C tand3only D 2and3only

Options:
A
B
C
D
Correct Key: C

Question 4
Paper Ref: 0620/23_Summer_2017_Q7

Aqueous iron(II) sulfate and aqueous sodium hydroxide react to give a precipitate of
iron(II hydroxide and a solution of sodium sulfate.
What is the balanced equation for this reaction?
A Fe2(SO,.)3(aq) + 2NaOH(aq) > Fe(OH)a(s) + NazSO,(aq)
B Fe2(S$O,)3(aq) + 3NaOH(aq) > Fe(OH)s(s) + 3Na₂SO,(aq)
C Fe₂(SO₄)₃(aq) + 6NaOH(aq) > 2Fe(OH)₃(s) + 3NazSOx(aq)
D 2Fe2(SO.)3(aq) + 6NaOH(aq) > 4Fe(OH)₃(s) + 6NazSOx(aq)

Options:
A
B
C
D
Correct Key: C

Question 5
Paper Ref: 0620/12_Spring_2022_Q12

Calcium carbonate, CaCQs, reacts with dilute hydrochloric acid to produce carbon dioxide.
The equation for the reaction is shown. The relative formula mass of calcium carbonate is 100.
CaCO; + 2HCI > CaCl, + H.0 + CO,
10g of calcium carbonate is reacted with an excess of dilute hydrochloric acid.
Which mass of carbon dioxide is produced?
A 2.2g B 2.89 C 44g D 44g

Options:
A
B
C
D
Correct Key: C

Question 6
Paper Ref: 0620/12_Winter_2018_Q9

Calcium carbonate, CaCOs, reacts with dilute hydrochloric acid to produce carbon dioxide.
The equation for the reaction is shown. The relative formula mass of calcium carbonate is 100.
CaCO, + 2HCI > CaCl, + H,O0 + CO,
10g of calcium carbonate is reacted with an excess of dilute hydrochloric acid.
Which mass of carbon dioxide is produced?
A 22g B 28g C 44g D 44g

Options:
A
B
C
D
Correct Key: C

Question 7
Paper Ref: 0620/11_Winter_2017_Q9

The equation shows the thermal decomposition of magnesium carbonate (M, = 84).
MgCOz3 — MgO + CO,
Which mass of magnesium oxide is formed when 21.0g of magnesium carbonate are completely
decomposed?
A 199 B 40g C 10.0g D 40.0g

Options:
A
B
C
D
Correct Key: C

Question 8
Paper Ref: 0620/22_Spring_2025_Q10

The equation for the reaction of magnesium with dilute sulfuric acid is shown.
[M,: MgSQ,, 120]
Which mass of magnesium sulfate is formed when 12g of magnesium completely reacts with
dilute sulfuric acid?
A 5g B 10g C 60g D 120g

Options:
A
B
C
D
Correct Key: C

Question 9
Paper Ref: 0620/11_Summer_2024_Q9

The equation for the reaction between magnesium and dilute hydrochloric acid is shown.
Mg + 2HCI > MgCl, + H,
Which mass of magnesium chloride is formed when 48.0g of magnesium completely reacts with
excess dilute hydrochloric acid?
A 23.89 B 47.59 C 95.0g D 190g

Options:
A
B
C
D
Correct Key: D

Question 10
Paper Ref: 0620/21_Winter_2024_Q10

Calcium carbonate is heated. Calcium oxide and carbon dioxide gas are formed.
The equation for the reaction is shown.
CaCO; > CaO + CO,
225 kg of calcium carbonate is heated until there is no further change in mass.
The yield of calcium oxide is 85kg.
What is the percentage yield?
A 37.8% Bo 47.2% C 67.5% D 85.0%

Options:
A
B
C
D
Correct Key: C

Question 11
Paper Ref: 0620/22_Spring_2021_Q10

A compound has the formula XF, and has a relative mass of 70.
What is element X?
A gallium
B germanium
C sulfur
D- ytterbium

Options:
A
B
C
D
Correct Key: C

Question 12
Paper Ref: 0620/21_Winter_2020_Q11

Sodium carbonate reacts with sulfuric acid to form carbon dioxide, water and a sodium salt.
An incomplete equation for the reaction is shown.
NazCO3 + H₂SO₄ 3 CO₂ + HeO F oo.
What is the formula of the sodium salt?

Options:
A
B
C
D
Correct Key: C

Question 13
Paper Ref: 0620/22_Summer_2013_Q7

The equation shows the reaction between magnesium and sulfuric acid.
(Mg = 24, H= 1, S = 32, O = 16)
In this reaction, what mass of magnesium sulfate will be formed when 6g of magnesium reacts
with excess sulfuric acid?
A 8 B 24 Cc 30 D 60

Options:
A
B
C
D
Correct Key: C

Question 14
Paper Ref: 0620/23_Summer_2012_Q8

The equation for the reaction between magnesium and dilute sulfuric acid is shown.
Mg + H,SO, > MgSO, + He
M, of MgSO, is 120
Which mass of magnesium sulfate will be formed if 12 g of magnesium are reacted with sulfuric
acid?
A 5g B 10g C 60g D 120g

Options:
A
B
C
D
Correct Key: C

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