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3.1 Formulae & Relative Masses
Question Paper
Course
CIE IGCSE Chemistry
Section
3. Stoichiometry
Topic
3.1 Formulae & Relative Masses
Difficulty
Medium
Time allowed:
10
Score:
/5
Percentage:
/100
Page 1 of 3
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Question 1
What is the balanced equation for the reaction of methane and oxygen?
A. CH4(g) + 2 O2(g) → CO2(g) + H2O(g)
B. CH4(g) + O2(g) → CO2(g) + 2 H2O(g)
C. 2 CH4(g) + 4 O2(g) → 2 CO2(g) + H2O(g)
D. CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g)
[1 mark]
Question 2
Extended Only
A compound contains two atoms of oxygen and one atom of calcium. It also contains hydrogen in sufficient amounts so
that the overall charge of the molecule is neutral.
What is the molecular formula for the compound?
A. Ca(OH)4
B. Ca(OH)2
C. H4CaO2
D. CaO2H2
[1 mark]
Question 3
Extended Only
Dilute sulfuric acid and barium chloride solution react to produce barium sulfate and hydrochloric acid, as shown in the
reaction below:
H2SO4 + BaCl2 → BaSO4 + 2 HCl
Which row represents the correct state symbols for the reaction?
A
B
C
D
H2SO4
(aq)
(l)
(aq)
(l)
BaCl2
(l)
(aq)
(aq)
(aq)
BaSO4
(s)
(aq)
(s)
(l)
HCl
(aq)
(l)
(aq)
(aq)
[1 mark]
Page 2 of 3
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Question 4
6 g of hydrogen react with 48 g of oxygen to form water. A chemist performs the same reaction using 2 g of hydrogen.
What mass of oxygen is required to combine with the hydrogen?
A. 24 g
B. 12 g
C. 16 g
D. 72 g
[1 mark]
Question 5
Extended Only
The formula and charge for positive and negative ions are shown.
cation
Al3+, Mg2+, Cu2+, Fe2+, Li+
anion
F-, CO32-, NO3-, S2-, SO42-
The table shows the name and formula of common ionic compounds formed from the ions. Which row is not correct?
name
formula
A
lithium sulfide
Li2S
B
iron(II) fluoride
Fe2F3
C
aluminium sulfate
Al2(SO4)3
D
magnesium nitrate
Mg(NO3)2
[1 mark]
Page 3 of 3
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