Case study·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
A teacher gives a partial table containing Li, Na, K in one column and F, Cl, Br in another column.
Total: 4 marks
(a) Which column contains alkali metals? (1 mark)
(b) Which pair from one column is expected to have similar reactions with water? (1 mark)
(c) Why do elements in one column show similar chemical behaviour? (1 mark)
(d) Which of Na and Cl is more metallic? Give the trend reason. (1 mark)
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