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Cambridge IGCSE Combined Science practice

Paper 4 structured question: Terminology

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Terminology

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Paper 4Theory (Extended)4 marks

Consider the properties of a homologous series of alkanes.

Description

Alkanes Overview

Alkanes are saturated hydrocarbons that form a homologous series. They have the general formula C_nH_(2n+2) and exhibit similar chemical properties.

  1. a

    Discuss the significance of the -CH2- unit in the homologous series of alkanes.

    Aim for approximately 4 distinct marking points.

    [4]

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Paper 4 structured question: Terminology

Paper 4Theory (Extended)2 marks

Description

Homologous Series Characteristics

A homologous series consists of compounds that have similar chemical properties and a gradual change in physical properties. Each member differs from the next by a -CH2- unit.

  1. a

    Define the term 'homologous series'.

    Aim for approximately 2 distinct marking points.

    [2]