DP Chemistry (last assessment 2024)

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Question 19N.2.hl.TZ0.6e(v)

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Date November 2019 Marks available [Maximum mark: 1] Reference code 19N.2.hl.TZ0.6e(v)
Level hl Paper 2 Time zone TZ0
Command term Deduce, Justify Question number e(v) Adapted from N/A
e(v).
[Maximum mark: 1]
19N.2.hl.TZ0.6e(v)

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

Copper(I) chloride undergoes a disproportionation reaction, producing copper(II) chloride and copper.

2Cu+ (aq) → Cu (s) + Cu2+ (aq)

(e(v))

Deduce, giving a reason, the sign of the standard enthalpy change, ΔHθ, for the disproportionation reaction at 298 K.

[1]

Markscheme

ΔGθ < 0 AND ΔSθ < 0 AND ΔHθ < 0
OR
ΔGθ + TΔSθ < 0 AND ΔHθ < 0 ✔

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