Cambridge IGCSE Combined Science practice

Paper 3 structured question: Simple molecules and covalent bonds

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Paper

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Topic

Simple molecules and covalent bonds

Exam-style question

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Paper 3Theory (Core)3 marks

Covalent bonding in organic molecules

Description

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

a
Explain the difference in bonding between CH₄ and C₂H₄.
Your answer
Aim for approximately 3 distinct marking points.
[3]

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Paper 3Theory (Core)3 marks

Description

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

a
Describe the formation of covalent bonds in H₂ and H₂O using dot-and-cross diagrams.
Your answer
Aim for approximately 3 distinct marking points.
[3]