Paper 2 · June 2024 · Chemicals of life

Fig. 1.1 shows three adjacent water molecules, with bond Y labelling the dashed line drawn between a hydrogen atom of one molecule and the oxygen atom of the next. Name bond Y.

Model answer

hydrogen bond

Also accepted: a hydrogen bond, hydrogen bonding

Explanation

The dashed line drawn between neighbouring water molecules represents a hydrogen bond, the weak attraction between the slightly positive hydrogen of one molecule and the slightly negative oxygen of the next.

Derived from ZIMSEC Biology 4025/2, June 2024, Q1(a)(i)

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Fig. 1.1 shows three adjacent water molecules, with bond Y labelling the dashed line drawn between a hydrogen atom of one molecule and the oxygen atom of the next. Name bond Y.

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