Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
The Alkali Metals
85 practice questions
Topics covered
Practice questions
51–60 of 85
Question 51
1 mark · Normal
Answer and check →Which compound is most likely to form a colourless solution in water?
- A.Potassium chloride
- B.Copper(II) sulphate
- C.Iron(III) nitrate
- D.Nickel(II) chloride
Question 52
2 marks · Normal
Answer and see the solution →State the formula and appearance of the solid produced when lithium burns in air.
Question 53
4 marks · Normal
Answer and see the solution →Group 1 compounds tend to dissolve easily in water.
(a)[1 mark]Describe what would be seen when sodium nitrate is dissolved in water.
(b)[2 marks]Explain why the solution formed is colourless.
(c)[1 mark]State an example of a group 1 compound that is not white or colourless, and give the reason for its colour.
Question 54
3 marks · Normal
Answer and see the solution →A student places a piece of sodium metal weighing 2.3 g in air and leaves it to react until it forms a layer of sodium oxide. The equation for the reaction is:
Calculate the mass of sodium oxide formed from 2.3 g of sodium, assuming all of the sodium reacts completely. (Relative atomic masses: Na = 23, O = 16)
Question 55
2 marks · Hard
Answer and see the solution →Describe what you would observe if a freshly cut piece of potassium is left exposed to air. Explain why this observation occurs.
Question 56
5 marks · Hard
Answer and see the solution →The table lists several Group 1 metal compounds:
(a)[3 marks]Compound Colour Solubility in water Lithium nitrate ? ? Sodium sulfate ? ? Potassium carbonate ? ? Complete the table by stating the usual colour and solubility in water of each compound.
(b)[2 marks]Explain why most compounds of lithium, sodium, and potassium dissolve to form colourless solutions.
Question 57
2 marks · Hard
Answer and see the solution →Explain why alkali metals must be stored under oil, using what happens when they are left uncovered in air.
Question 58
1 mark · Easy
Answer and see the solution →State the symbol of francium.
Question 59
3 marks · Easy
Answer and see the solution →Francium is below caesium in Group 1 of the Periodic Table.
(a)[1 mark]State whether francium is expected to be hard or soft.
(b)[1 mark]State if francium is expected to react faster or slower with water compared to caesium.
(c)[1 mark]State the colour francium is predicted to be when freshly cut.
Question 60
2 marks · Easy
Answer and see the solution →The density of caesium is 1.87 g/cm³. Based on the trend in Group 1, predict the approximate density of francium. Give your answer to one decimal place.