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8.2 Heat energy changes in chemical reactions

8.2 Heat energy changes in chemical reactions

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Question 15
H

For CH4+2O2→CO2+2H2O\mathrm{CH_4+2O_2\rightarrow CO_2+2H_2O}CH4​+2O2​→CO2​+2H2​O, which reactant bonds must be included in a bond-energy calculation?

[1]
A

Four C-C bonds and two O-H bonds

B

One C-H bond and one O-O bond

C

Two C=O bonds and four O-H bonds

D

Four C-H bonds and two O=O bonds

Markscheme

8.2 Heat energy changes in chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /8.2 Heat energy changes in chemical reactions

94 exam-style questions on Edexcel GCSE Chemistry 8.2 Heat energy changes in chemical reactions, covering 8.2.1 Exothermic and endothermic changes, 8.2.2 Bond breaking, bond making and overall energy change, 8.2.3 Calculating energy change from bond energies, and 8.2.4 Activation energy and reaction profiles. Each one has a worked solution and a mark scheme showing where the marks go.

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