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IB Chemistry SL 3.1.4 Group Trends Questions

Use real exam questions to explain Group 1 reactions with water and predict Group 17 halide displacement from periodic trends.

Syllabus
First assessment 2025
Course
Chemistry SL
Level
SL

Exam points

  • Describe and explain how Group 1 metallic character and reactivity with water change down the group, including a balanced metal–water equation and observable reaction differences.
  • Describe and explain how Group 17 non-metallic character and halogen reactivity change down the group, using electron gain, oxidizing strength and an appropriate trend comparison.
  • Predict a Group 17 halide-displacement outcome or compare Group 1/17 reactivity, giving the ionic equation, colour change or periodic-trend reason supported by the question data.

Learn this topic

Study 3.1.4—Group trends conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry SL 3.1.4 Group Trends Questions question 1

[Maximum number: 2]

Chlorine occurs in Group 7, the halogens.

Question (a)

(a)

Chlorine has an electronegativity value of 3.2 on the Pauling scale.

[ 2 ]

Question (i)

(i)

State the balanced chemical equation for the reaction of potassium bromide, KBr(aq), with chlorine, Cl2(aq)\mathrm{Cl}_{2}(\mathrm{aq}).

[ 1 ]

Question (ii)

(ii)

Describe the colour change likely to be observed in this reaction.

[ 1 ]
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