Sodium reacts vigorously with water to form sodium hydroxide and hydrogen gas:
2Na(s)+2H2O(l)→2NaOH(aq)+H2(g) 2\text{Na(s)} + 2\text{H}_2\text{O(l)} \rightarrow 2\text{NaOH(aq)} + \text{H}_2\text{(g)} 2Na(s)+2H2O(l)→2NaOH(aq)+H2(g)A student adds a small, freshly-cut piece of sodium metal to a trough containing water and a few drops of phenolphthalein indicator.
Predict three observations the student would make during this reaction.
75 exam-style questions on Edexcel GCSE Chemistry 7.1 Group 1, covering 7.1.1 Classifying elements by group in the periodic table and 7.1.2 Properties and reactions of the alkali metals. Each one has a worked solution and a mark scheme showing where the marks go.