Paper 2 · June 2024 · Chemicals of life

Fig. 1.1 shows three adjacent water molecules, with element X labelling the large shaded sphere of one molecule. Identify element X.

Model answer

oxygen

Also accepted: oxygen atom, an oxygen atom

Explanation

The large shaded sphere in each water molecule of Fig. 1.1 represents the oxygen atom; the two smaller circles joined to it are its two hydrogen atoms.

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

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Fig. 1.1 shows three adjacent water molecules, with element X labelling the large shaded sphere of one molecule. Identify element X.

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