DP Chemistry (last assessment 2024)

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Question 19N.2.hl.TZ0.c(iv)

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Date November 2019 Marks available [Maximum mark: 1] Reference code 19N.2.hl.TZ0.c(iv)
Level hl Paper 2 Time zone TZ0
Command term Deduce, Formulate Question number c(iv) Adapted from N/A
c(iv).
[Maximum mark: 1]
19N.2.hl.TZ0.c(iv)

Copper forms two chlorides, copper(I) chloride and copper(II) chloride.

Two electrolysis cells were assembled using graphite electrodes and connected in series as shown.

 

Deduce the half-equation for the formation of the gas identified in (c)(iii).

[1]

Markscheme

2H2O (l) → 4H+ (aq) + O2 (g) + 4e– ✔

NOTE: Accept 2Cl– (aq) → Cl2 (g) + 2e–.
Accept 4OH− → 2H2O + O2 + 4e−

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