DP Chemistry (first assessment 2025)

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Question 21N.1A.HL.TZ0.30

Date	November 2021	Marks available	[Maximum mark: 1]	Reference code	21N.1A.HL.TZ0.30
Level	HL	Paper	1A	Time zone	TZ0
Command term	Predict	Question number	30	Adapted from	N/A

30.

[Maximum mark: 1]

21N.1A.HL.TZ0.30

Consider the following standard electrode potentials:

Which species will react with each other spontaneously under standard conditions?

A. Zn²⁺(aq) + Pb (s)

B. Pb²⁺(aq) + Br₂(l)

C. Zn (s) + Br⁻(aq)

D. Pb (s) + Br₂ (l)

[1]

Markscheme

D

Syllabus sections

Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.2—Electron transfer reactions » Reactivity 3.2.13—Standard cell potential, E⦵cell, can be calculated from standard electrode potentials. E⦵cell has a positive value for a spontaneous reaction. Predict whether a reaction is spontaneous in the forward or reverse direction from E⦵ data.