DP Chemistry (first assessment 2025)

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Question 23M.2.HL.TZ1.4a

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Date May 2023 Marks available [Maximum mark: 3] Reference code 23M.2.HL.TZ1.4a
Level HL Paper 2 Time zone TZ1
Command term Explain Question number a Adapted from N/A
a.
[Maximum mark: 3]
23M.2.HL.TZ1.4a
(a)

Explain why metals alloyed with another metal are usually harder and stronger but poorer conductors than the pure metal.

[3]

Markscheme

metal ions/atoms have different sizes ✓
cations/atoms/layers do not slide over each other as easily ✓
«irregularities» obstruct free movement of electrons ✓


Accept electrons move less easily/less delocalized for M3.