DP Chemistry (last assessment 2024)

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Question 18N.3.hl.TZ0.15a

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Date November 2018 Marks available [Maximum mark: 1] Reference code 18N.3.hl.TZ0.15a
Level hl Paper 3 Time zone TZ0
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 1]
18N.3.hl.TZ0.15a

Chemical energy from redox reactions can be used as a source of electrical energy.

(a)

Outline how a rechargeable battery differs from a primary cell.

[1]

Markscheme

«redox» reaction in rechargeable battery is reversible «but not in a primary cell»

OR

secondary cells need to be charged before use

OR

secondary cells have greater rate of self-discharge ✔

 

Accept “primary cells cannot be recharged/reused”, “primary cells can be used only once” OR “lithium batteries may explode”.

Syllabus sections