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Date	May 2021	Marks available	1	Reference code	21M.2.sl.TZ1.3
Level	SL	Paper	2	Time zone	TZ1
Command term	Deduce	Question number	3	Adapted from	N/A

Question

Magnetite, Fe₃O₄, is another ore of iron that contains both Fe²⁺ and Fe³⁺.

Iron exists as several isotopes.

In acidic solution, hydrogen peroxide, H₂O₂, will oxidize Fe²⁺.

Fe²⁺ (aq) → Fe³⁺ (aq) + e⁻

Deduce the ratio of Fe²⁺:Fe³⁺ in Fe₃O₄.

[1]

State the type of spectroscopy that could be used to determine their relative abundances.

[1]

b(i).

State the number of protons, neutrons and electrons in each species.

[2]

b(ii).

Iron has a relatively small specific heat capacity; the temperature of a 50 g sample rises by 44.4°C when it absorbs 1 kJ of heat energy.

Determine the specific heat capacity of iron, in J g⁻¹K⁻¹. Use section 1 of the data booklet.

[1]

Write the half-equation for the reduction of hydrogen peroxide to water in acidic solution.

[1]

d(i).

Deduce a balanced equation for the oxidation of Fe2+ by acidified hydrogen peroxide.

[1]

d(ii).

Markscheme

1:2 ✔

Accept 2 Fe³⁺: 1 Fe²⁺
Do not accept 2:1 only

mass «spectroscopy»/MS ✔

b(i).

Award [1 max] for 4 correct values.

b(ii).

specific heat capacity « = $\frac{q}{m \times ∆ T} / \frac{1000 J}{50 g \times 44 K}$ » = 0.45 «J g⁻¹K⁻¹» ✔

H₂O₂(aq) + 2H⁺(aq) + 2e⁻→ 2H₂O(l) ✔

d(i).

H₂O₂(aq) + 2H⁺(aq) + 2Fe²⁺(aq) → 2H₂O(l) + 2Fe³⁺(aq) ✔

d(ii).

Examiners report

[N/A]

b(i).

[N/A]

b(ii).

[N/A]

d(i).

[N/A]

d(ii).

Syllabus sections

Core » Topic 4: Chemical bonding and structure » 4.1 Ionic bonding and structure

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22M.2.sl.TZ1.1g:
State the types of bonding in magnesium, oxygen and magnesium oxide, and how the valence electrons produce these types of bonding.
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State the type of bonding in potassium chloride which melts at 1043 K.
22M.1.sl.TZ2.9:
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Identify the type of bonding in sodium hydrogencarbonate.

Between sodium and hydrogencarbonate:

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