DP Chemistry (first assessment 2025)

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Question 19N.2.SL.TZ0.a(ii)

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

a(ii).

[Maximum mark: 2]

19N.2.SL.TZ0.a(ii)

Suggest why the resistance of metals increases with temperature.

[2]

Markscheme

increased vibrations of «lattice» ions ✔
increased «probability of» collisions «between electrons and cations» ✔

NOTE: Accept “increases lattice vibrations” for M1.

Syllabus sections

Structure 2. Models of bonding and structure » Structure 2.3—The metallic model » Structure 2.3.1—A metallic bond is the electrostatic attraction between a lattice of cations and delocalized electrons. Explain the electrical conductivity, thermal conductivity and malleability of metals.