DP Chemistry (first assessment 2025)

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Question 19M.2.SL.TZ2.19c

Date	May 2019	Marks available	[Maximum mark: 1]	Reference code	19M.2.SL.TZ2.19c
Level	SL	Paper	2	Time zone	TZ2
Command term	Outline	Question number	c	Adapted from	N/A

c.

[Maximum mark: 1]

19M.2.SL.TZ2.19c

(c)

Outline one difference between a primary and a secondary cell.

[1]

Markscheme

Any one of:

Note: Accept “primary cannot be recharged AND “secondary can be recharged”.

Examiners report

Most candidates were able to state one difference between a primary and a secondary cell.

Syllabus sections

Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.2—Electron transfer reactions » Reactivity 3.2.6—A primary (voltaic) cell is an electrochemical cell that converts energy from spontaneous redox reactions to electrical energy. Explain the direction of electron flow from anode to cathode in the external circuit, and ion movement across the salt bridge.

Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.2—Electron transfer reactions » Reactivity 3.2.7—Secondary (rechargeable) cells involve redox reactions that can be reversed using electrical energy. Deduce the reactions of the charging process from given electrode reactions for discharge, and vice versa.