DP Chemistry (first assessment 2025)

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Question 19N.2.HL.TZ0.a(v)

Date	November 2019	Marks available	[Maximum mark: 1]	Reference code	19N.2.HL.TZ0.a(v)
Level	HL	Paper	2	Time zone	TZ0
Command term	Comment	Question number	a(v)	Adapted from	N/A

a(v).

[Maximum mark: 1]

19N.2.HL.TZ0.a(v)

Comment on the spontaneity of the reaction at 298 K.

[1]

Markscheme

non-spontaneous AND $\Delta {G^\theta }$ positive ✔

Syllabus sections

Reactivity 1. What drives chemical reactions? » Reactivity 1.4—Entropy and spontaneity (Additional higher level) » Reactivity 1.4.3—At constant pressure, a change is spontaneous if the change in Gibbs energy, ΔG, is negative. Interpret the sign of ΔG calculated from thermodynamic data. Determine the temperature at which a reaction becomes spontaneous.