Chapter 2: Group 2 and Group 7 Trends

A-level ChemistryModule 3: Periodic Table & Energy7 topicsHigher

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Releases 1 August 2026

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Module 3: Periodic Table and Energy: Group 2 and Group 7 Trends - Authored Long Answer Questions

Examiner-style long-answer practice with automatic marking, improvement advice and ProofCoach tracking.

4 questions25 marks37.5 min

standard / hard

6 marksdescribestandardOCR A

For Group 2 and Group 7 Trends, describe how periodic reactivity trends and redox observations applies to chlorine displacement of bromide and iodide ions.

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6 markscalculatehardOCR A

Using chlorine displacement of bromide and iodide ions, calculate a relevant OCR A Group 2 and Group 7 Trends quantity and explain the physical or chemical meaning of the answer. Show equation, substitution, answer and unit.

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7 marksexplainhardOCR A

Group 2 and Group 7 Trends: Halogen volume added (cm3) vs Organic-layer colour intensity (%)

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The graph for Group 2 and Group 7 Trends shows data from chlorine displacement of bromide and iodide ions. Explain the pattern using the data and relevant chemistry principles.

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6 marksevaluatestandardOCR A

In chlorine displacement of bromide and iodide ions, evaluate the experimental method or model assumptions used when applying periodic reactivity trends and redox observations.

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1. Periodicity and Ionisation Energy

3. Qualitative Inorganic Analysis

Key learning objectives

Understand the key principles behind Group 2 and Group 7 Trends.
Apply these ideas to exam-style questions.
Recall the essential definitions and key terms.