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Cambridge IGCSE Chemistry 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)1 marks

Covalent bonding in simple molecules

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Covalent Bonds in Molecules

Consider the following molecules: H₂, CH₄, H₂O, I₂, NH₃, and CCl₄. Each of these molecules is formed by covalent bonds between non-metal atoms.

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    State the type of bond formed in these molecules.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: Simple molecules and covalent bonds

Paper 3Theory (Core)3 marks

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Dot-and-Cross Diagrams

Dot-and-cross diagrams can be used to represent the covalent bonds in molecules like H₂, CH₄, and H₂O. In these diagrams, dots represent electrons from one atom and crosses represent electrons from another atom.

  1. a

    Describe how a dot-and-cross diagram for H₂O would look.

    Aim for approximately 3 distinct marking points.

    [3]