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Cambridge IGCSE Combined Science practice

Paper 4 structured question: Simple molecules and covalent bonds

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Simple molecules and covalent bonds

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Paper 4Theory (Extended)4 marks

Covalent bonding in simple molecules

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Covalent Bonds in Molecules

Consider the following molecules: CH₃OH, C₂H₄, O₂, CO, and N₂. Each of these molecules is formed through covalent bonding, where atoms share electrons to achieve stable electronic configurations.

  1. a

    Explain the formation of covalent bonds in CH₃OH and C₂H₄ using dot-and-cross diagrams.

    Aim for approximately 4 distinct marking points.

    [4]

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Paper 4 structured question: Simple molecules and covalent bonds

Paper 4Theory (Extended)3 marks

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Covalent Bonds in N₂ and O₂

Nitrogen (N₂) and oxygen (O₂) are diatomic molecules formed by covalent bonding. Each molecule consists of two atoms that share electrons to achieve stability.

  1. a

    Describe the covalent bonding in N₂ and O₂, including the number of bonds and the electron sharing involved.

    Aim for approximately 3 distinct marking points.

    [3]