A small piece of sodium is added to a trough of water. Only four of the following statements correctly describe what happens during this reaction. Identify the four correct statements from this list: 1. sodium hydroxide solution is formed; 2. fizzing occurs; 3. sodium sinks to the bottom of the water; 4. carbon dioxide gas is produced; 5. sodium melts into a ball; 6. a lilac flame is seen; 7. sodium moves around on the surface; 8. sodium reacts to form an acidic solution.
21 exam-style questions on Edexcel IGCSE Chemistry Group 1 (alkali metals) – lithium, sodium and potassium. Each one has a worked solution and a mark scheme showing where the marks go.