DP Chemistry (last assessment 2024)

Question 22M.1.hl.TZ2.16

Date	May 2022	Marks available	[Maximum mark: 1]	Reference code	22M.1.hl.TZ2.16
Level	hl	Paper	1	Time zone	TZ2
Command term	State	Question number	16	Adapted from	N/A

16.

[Maximum mark: 1]

22M.1.hl.TZ2.16

Which equation represents the bond enthalpy for H–Br in hydrogen bromide?

A. HBr (g) → H⁺ (g) + Br⁻ (g)

B. HBr (g) → H (g) + Br (g)

C. HBr (g) → $\frac{1}{2}$ H₂ (g) + $\frac{1}{2}$ Br₂ (l)

D. HBr (g) → $\frac{1}{2}$ H₂ (g) + $\frac{1}{2}$ Br₂ (g)

[1]

Markscheme

Examiners report

Only a quarter of the candidates identified the equation representing the bond enthalpy of HBr. The most commonly chosen distractor had the elements H₂ and Br₂ as the products.

Syllabus sections

Core

Core » Topic 5: Energetics/thermochemistry » 5.3 Bond enthalpies

Core » Topic 5: Energetics/thermochemistry

Question 22M.1.hl.TZ2.16

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