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Cambridge IGCSE Combined Science practice

Paper 3 structured question: Simple molecules and covalent bonds

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Simple molecules and covalent bonds

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Paper 3Theory (Core)3 marks

Covalent bonding in simple molecules

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Covalent Bonds in Molecules

Consider the following molecules: H₂, Cl₂, H₂O, CH₄, NH₃, and C₂H₄. Each of these molecules is formed by covalent bonds where atoms share electrons.

  1. a

    Describe the formation of covalent bonds in H₂ and H₂O using dot-and-cross diagrams.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 3 structured question: Simple molecules and covalent bonds

Paper 3Theory (Core)3 marks

Description

Covalent Bonds in Organic Molecules

Examine the structure of methane (CH₄) and ethene (C₂H₄). Both molecules are formed by covalent bonds between carbon and hydrogen atoms.

  1. a

    Explain the difference in bonding between CH₄ and C₂H₄.

    Aim for approximately 3 distinct marking points.

    [3]