In a reaction, the energy taken in to break the bonds in the reactants is 1560 kJ/mol.
The energy released when the bonds in the products are made is 1740 kJ/mol.
Which statement about the reaction profile for this reaction is correct?
The products are 180 kJ/mol180\,\mathrm{kJ/mol}180kJ/mol higher in energy than the reactants.
The products are 3300 kJ/mol3300\,\mathrm{kJ/mol}3300kJ/mol lower in energy than the reactants.
The products are 180 kJ/mol180\,\mathrm{kJ/mol}180kJ/mol lower in energy than the reactants.
The products are 3300 kJ/mol3300\,\mathrm{kJ/mol}3300kJ/mol higher in energy than the reactants.
51 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.