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Edexcel IGCSE Chemistry 1.46 covalent dot-and-cross diagrams

Practise covalent dot-and-cross questions by drawing shared pairs, lone pairs and single, double or triple bonds in molecules.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • Draw shared electron pairs for molecules such as propane, chloroethene or small diatomics.
  • Show only outer-shell electrons, including lone pairs where the atom keeps them.
  • Distinguish single, double and triple covalent bonds from the number of shared pairs.

1.46 Covalent dot-and-cross diagrams question 1

[Maximum number: 2]

A student uses this apparatus to investigate the decomposition of hydrogen peroxide solution.

Figure for Question 1.46 Covalent dot-and-cross diagrams question 1 — Edexcel IGCSE Chemistry

This is the equation for the reaction.

2H2O2→2H2O+O22 \mathrm{H}_{2} \mathrm{O}_{2} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}

Complete the dot-and-cross diagram for a molecule of hydrogen peroxide.

Show outer electrons only.

Figure for Question 1.46 Covalent dot-and-cross diagrams question 1 — Edexcel IGCSE Chemistry
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