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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 13
H

Breaking reactant bonds needs 1250 kJ mol−11250\,\mathrm{kJ\,mol^{-1}}1250kJmol−1 and forming product bonds releases 1480 kJ mol−11480\,\mathrm{kJ\,mol^{-1}}1480kJmol−1. What is ΔH\Delta HΔH?

[1]
A

+230 kJ mol−1+230\,\mathrm{kJ\,mol^{-1}}+230kJmol−1

B

2730 kJ mol−12730\,\mathrm{kJ\,mol^{-1}}2730kJmol−1

C

−230 kJ mol−1-230\,\mathrm{kJ\,mol^{-1}}−230kJmol−1

D

−2730 kJ mol−1-2730\,\mathrm{kJ\,mol^{-1}}−2730kJmol−1

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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