These questions are suitable for GCSE chemistry students studying any awarding body specification. The quick-fire quiz will ask 10 chemistry questions, across a random selection of topics and will ...

Energy in = 436 + 243 = 679 kJ/mol (this is the energy absorbed when the bonds of the reactants break). Energy out = 2 × 432 = 864 kJ/mol (this is the energy released when the bonds of the products ...