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3.2 Energetics

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Question 40

Hydrogen peroxide, H−O−O−H\mathrm{H{-}O{-}O{-}H}H−O−O−H, decomposes to form water and oxygen.

2H2O2→2H2O+O2 2\mathrm{H_2O_2} \rightarrow 2\mathrm{H_2O} + \mathrm{O_2} 2H2​O2​→2H2​O+O2​
BondBond energy (kJ/mol\mathrm{kJ/mol}kJ/mol)
O–H463
O–O146
O=O498

Use the bond energies to calculate the energy change, in kJ/mol\mathrm{kJ/mol}kJ/mol, for the equation as written.

[3]
Markscheme

3.2 Energetics Questions

  1. GCSE
  2. /Chemistry
  3. /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.

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