DP Chemistry (first assessment 2025)

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Question 21M.2.SL.TZ1.3d(i)

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.2.SL.TZ1.3d(i)
Level	SL	Paper	2	Time zone	TZ1
Command term	Write	Question number	d(i)	Adapted from	N/A

d(i).

[Maximum mark: 1]

21M.2.SL.TZ1.3d(i)

(d(i))

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

[1]

Markscheme

H₂O₂(aq) + 2H⁺(aq) + 2e⁻→ 2H₂O(l) ✔

Syllabus sections

Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.2—Electron transfer reactions » Reactivity 3.2.2—Half-equations separate the processes of oxidation and reduction, showing the loss or gain of electrons. Deduce redox half-equations and equations in acidic or neutral solutions.