Chemical families and group properties — KCSE Chemistry

KCSE Chemistry · 32 practice questions · 3 syllabus objectives

11 easy11 medium10 hard

What You'll Learn

Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.

Describe the properties of Group I (alkali metals) and Group II (alkaline earth metals)

Describe the properties and uses of Group VII (halogens) elements

Explain trends in properties of chemical families across and down the periodic table

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easySHORT ANSWER4 marks

State how the reactivity of alkaline earth metals changes as you move down Group II of the periodic table. (4 marks)

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Part (a) — 4 marks

Reactivity increases as you move down the group (1 mk)

This is due to the decrease in ionisation energy down the group (1 mk)

Larger atomic size makes it easier to lose the outermost electron (1 mk)

Resulting in a stronger tendency to form positive ions (1 mk)

easySHORT ANSWER2 marks

State two similarities in the chemical properties of elements in Group VII of the periodic table. (2 marks)

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Part (a) — 2 marks

All are nonmetals (1 mk)

They all form diatomic molecules (e.g., Cl₂, Br₂) (1 mk)

easySHORT ANSWER2 marks

State the group number and name of the family that includes lithium, sodium, and potassium. (2 marks)

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Part (a) — 2 marks

Group number: 1 (1 mk)

Name of family: Alkali metals (1 mk)

Describe two common uses of chlorine in everyday life. (2 marks)

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