IB Chemistry SL S2.2 The covalent model questions

Exam-style multiple choice and written questions with full markschemes. Check multiple choice answers straight away, or type, photograph or draw a written answer and get it marked.

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Question 1

Paper 2Medium4 marks

Figure 1 shows Lewis representations of ammonia, $\ce{NH3}$ and methane, $\ce{CH4}$ Each line represents a single covalent bond. The arrangements shown do not represent the three-dimensional molecular shapes.

(a)

State the electron-domain geometry around the central atom in each molecule.

[1]

(b)

Compare the molecular geometries of $\ce{NH3}$ and $\ce{CH4}$

[1]

(c)

The H–N–H bond angle in $\ce{NH3}$ is smaller than the H–C–H bond angle in $\ce{CH4}$ Explain why.

[2]

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