DP Physics (first assessment 2025)

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Question EXE.2.HL.TZ0.1ciii

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Date Example questions Example questions Marks available [Maximum mark: 1] Reference code EXE.2.HL.TZ0.1ciii
Level HL Paper 2 Time zone TZ0
Command term Outline Question number iii Adapted from N/A
iii.
[Maximum mark: 1]
EXE.2.HL.TZ0.1ciii

The following data are given about the work W done by the gas and thermal energy Q transferred to the gas during each change:

Change W / kJ Q / kJ
AB 8.23 20.58
BC 9.11 0
CD −4.32 −10.81
DA −3.25 0
(iii)

Outline why the entropy of the gas remains constant during changes BC and DA.

[1]

Markscheme

From ΔS=ΔQT, the change in entropy is zero when ΔQ=0 ✓

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