When ammonium chloride dissolves in water, the process is endothermic.
Compared with the initial temperature of the water, the final temperature of the mixture is
always higher
always lower
sometimes higher and sometimes lower
always unchanged
94 exam-style questions on Edexcel GCSE Chemistry 8.2 Heat energy changes in chemical reactions, covering 8.2.1 Exothermic and endothermic changes, 8.2.2 Bond breaking, bond making and overall energy change, 8.2.3 Calculating energy change from bond energies, and 8.2.4 Activation energy and reaction profiles. Each one has a worked solution and a mark scheme showing where the marks go.