A sealed reaction vessel is surrounded by water. Before the chemicals are mixed, the water is at 22.0 ∘C22.0\ ^{\circ}\text{C}22.0 ∘C. During the reaction, the temperature of the water falls to 17.0 ∘C17.0\ ^{\circ}\text{C}17.0 ∘C.
Which statement explains the change in temperature of the water during this reaction?
Energy is stored by the water as its temperature falls.
Energy is transferred from the water to the reacting chemicals.
Energy is transferred from the reacting chemicals to the water.
Cold is transferred from the reacting chemicals to the water.
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.