Exam style question and answers- Additional science

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Q. Ammonia is a gas at room temperature. Explain why ammonia has a low boiling point. (2 marks)

A. Ammonia is made of simple molecules. There are weak intermolecular forces which are easily overcome when heat energy is applied.

Q. Ammonia dissolves in water to form a solution with a pH of 10. Name an ion in the ammonia solution that causes the pH of 10. (1 mark)

A. Hydroxide ion

Q. lnstant cold packs are used to treat sports injuries. One type of cold pack has a plastic

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