3.2 Energetics

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Question 27

Carbon monoxide reacts with oxygen to form carbon dioxide.

\mathrm{2CO + O_{2} \rightarrow 2CO_{2}}

Each carbon monoxide molecule contains one $C≡O\mathrm{C{\equiv}O}$ bond. Carbon dioxide is $O=C=O\mathrm{O{=}C{=}O}$ .

Bond	$C≡O\mathrm{C{\equiv}O}$	$O=O\mathrm{O{=}O}$	$C=O\mathrm{C{=}O}$
Bond energy ( $kJ/mol\mathrm{kJ/mol}$ )	1077	498	805

Calculate the energy change for the reaction.

Show your working.

[3]

Explain what your answer to part (a) predicts about the position of the products on a reaction profile and the temperature of the surroundings.

[3]

Markscheme

3.2 Energetics Questions

GCSE
Chemistry
3.2 Energetics

106 exam-style questions on OCR GCSE Chemistry 3.2 Energetics, covering 3.2.1 Exothermic and endothermic reactions and reaction profiles and 3.2.2 Calculating energy change from bond energies. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank·3.2 Energetics