Two moles of substance R can change reversibly into two moles of substance S. Changing R into S transfers 120 kJ of energy to the surroundings.
Which statement describes the energy transfer when two moles of S change back into R?
120 kJ of energy is taken in from the surroundings
More than 120 kJ is taken in from the surroundings
Less than 120 kJ is released to the surroundings
120 kJ of energy is released to the surroundings
109 exam-style questions on AQA GCSE Chemistry 6.2 Reversible reactions and dynamic equilibrium, covering 6.2.1 Reversible reactions, 6.2.2 Energy changes and reversible reactions, 6.2.3 Equilibrium, 6.2.4 The effect of changing conditions on equilibrium, 6.2.5 The effect of changing concentration, 6.2.6 The effect of temperature changes on equilibrium, and 6.2.7 The effect of pressure changes on equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.