O-LevelChemistryBonding & Structure5070/12 · Oct/Nov 2015 · Q81 Mark

A metal consists of a lattice of positive ions in a 'sea of electrons'. What happens to the electrons and positive ions in a metal wire when an electric current is passed through it? [Table showing options for electrons and positive ions]

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Areplaced by new electrons / replaced by new ions

Breplaced by new electrons / unchanged

Cunchanged / replaced by new ions

Dunchanged / unchanged

✓ Correct answer

B: replaced by new electrons / unchanged

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Topic: Bonding & Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2015 Paper 1 Variant 2, question 8.

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