Sherbet sweets contain citric acid and sodium hydrogencarbonate.
When sherbet dissolves on the tongue, these chemicals react and the tongue feels cold.
Which statement explains why the tongue feels cold?
Cold is transferred from the reacting chemicals to the tongue.
Energy is transferred from the reacting chemicals to the tongue.
Energy is transferred from the tongue to the reacting chemicals.
The reaction makes a gas that is much colder than the tongue.
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.