A practical technician has samples of lithium, calcium, sodium and magnesium. Each sample is placed separately in room-temperature water. Which observation is expected for lithium?
It sinks while bubbles form and the water becomes cloudy.
It produces only a few bubbles very slowly.
It melts into a ball, fizzes and darts across the surface.
It floats and fizzes steadily, moving more slowly than sodium.
86 exam-style questions on AQA GCSE Chemistry 4.1 Reactivity of metals, covering 4.1.1 Metal oxides, 4.1.2 The reactivity series, 4.1.3 Extraction of metals and reduction, and 4.1.4 Oxidation and reduction in terms of electrons. Each one has a worked solution and a mark scheme showing where the marks go.