8.2.4 Alkali Metal Reactivity
Cambridge IGCSE Chemistry 0620 · Papers 2, 3 & 4 · 30 marks total
Q1.State two observations when sodium is added to cold water.
[2 marks]Q2.What colour is the flame produced when potassium reacts with water?
[1 mark]Q3.Describe two observations that show lithium is less reactive than potassium when both are added to water.
[2 marks]Q4.Universal indicator is added to the water before sodium is placed in it. Describe what you would observe during the reaction.
[2 marks]Q5.A student cuts a small piece of potassium and drops it into a trough of water. State three observations the student would make.
[3 marks]Q6.Describe the trend in reactivity as you go down Group I (the alkali metals).
[1 mark]Q7.Explain, in terms of electronic structure, why caesium is more reactive than lithium.
[2 marks]Q8.Predict the melting point trend and the density trend as you go down Group I.
[2 marks]Q9.A student claims that rubidium will react more slowly with water than potassium because rubidium is heavier. Evaluate this claim.
[2 marks]Q10.Francium (Fr) is the element below caesium in Group I. Predict three properties of francium.
[3 marks]Q11.Name the two products formed when lithium reacts with water.
[1 mark]Q12.Write the balanced symbol equation for sodium reacting with water.
[2 marks]Q13.Write the balanced symbol equation, including state symbols, for potassium reacting with water.
[2 marks]Q14.A solution of lithium hydroxide is tested with litmus paper and then with dilute hydrochloric acid. Describe what is observed in each test.
[2 marks]Q15.A student burns a small piece of sodium in oxygen. (a) Name the product formed. (b) Write the balanced symbol equation. (c) Describe what the student would observe.
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