DP Chemistry (last assessment 2024)

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Question 19M.1.hl.TZ2.16

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1.hl.TZ2.16
Level hl Paper 1 Time zone TZ2
Command term Question number 16 Adapted from N/A
16.
[Maximum mark: 1]
19M.1.hl.TZ2.16

Which equation represents lattice enthalpy?

A. NaCl (g) → Na+ (g) + Cl− (g)

B. NaCl (s) → Na+ (g) + Cl− (g)

C. NaCl (s) → Na+ (aq) + Cl− (aq)

D. NaCl (s) → Na+ (s) + Cl− (s)

[1]

Markscheme

B

Examiners report

72 % of candidates chose the correct equation that represents lattice enthalpy. Many candidates chose A, where the ionic compound (NaCl) was gaseous, and others chose distractor C, where the ions produced were aqueous. The discrimination index for the question was quite high.

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