Calcium reacts with water to form calcium hydroxide, Ca(OH)2\text{Ca(OH)}_2Ca(OH)2, and hydrogen, H2\text{H}_2H2, according to the following equation:
Ca(s)+2H2O(l)→Ca(OH)2(aq/s)+H2(g) \text{Ca(s)} + 2\text{H}_2\text{O(l)} \rightarrow \text{Ca(OH)}_2\text{(aq/s)} + \text{H}_2\text{(g)} Ca(s)+2H2O(l)→Ca(OH)2(aq/s)+H2(g)Describe two things that would be seen when a small piece of calcium is added to a beaker of cold water.
110 exam-style questions on Edexcel GCSE Chemistry 5.1 Obtaining and using metals, covering 5.1.1 The reactivity series of metals, 5.1.2 Displacement reactions as redox reactions, 5.1.3 Extracting metals from ores by reduction, 5.1.4 Biological methods of metal extraction, 5.1.5 Resistance to oxidation and recycling metals, and 5.1.6 Life cycle assessment. Each one has a worked solution and a mark scheme showing where the marks go.