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Cambridge IGCSE Combined Science practice

Paper 3 structured question: Group I properties

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Group I properties

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Paper 3Theory (Core)2 marks

The reactivity of alkali metals is an important characteristic.

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Reactivity of Alkali Metals

Alkali metals react with water to form hydroxides and hydrogen gas. The reactivity increases down the group from lithium to potassium.

  1. a

    Explain why potassium is more reactive with water than lithium.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 3 structured question: Group I properties

Paper 3Theory (Core)3 marks

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Properties of Alkali Metals

Lithium, sodium, and potassium are the first three alkali metals in Group I of the periodic table. They exhibit trends in their physical and chemical properties as you move down the group.

  1. a

    Describe the trends in melting point, density, and reactivity of alkali metals as you move down the group.

    Aim for approximately 3 distinct marking points.

    [3]