DP Physics (first assessment 2025)

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Question 19M.1A.SL.TZ2.10

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1A.SL.TZ2.10
Level SL Paper 1A Time zone TZ2
Command term Question number 10 Adapted from N/A
10.
[Maximum mark: 1]
19M.1A.SL.TZ2.10

A substance changes from the solid phase to the gas phase without becoming a liquid and without a change in temperature.

What is true about the internal energy of the substance and the total intermolecular potential energy of the substance when this phase change occurs?

[1]

Markscheme

C

Examiners report

This question has a low discrimination index at SL with more candidates choosing response D rather than the correct C. Candidates should remember that all information given in the question is important and the clue here is ‘without a change in temperature’. Thus the kinetic energy does not change so internal energy and potential energy will both have the same change and in addition energy must be provided to change the state of a solid.

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