Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Compounds of the alkali metals
19 practice questions
Practice questions
1–8 of 8 · Easy
Question 1
1 mark · Easy
Answer and see the solution →State what you would see when a piece of freshly cut lithium is left exposed to air.
Question 2
3 marks · Easy
Answer and see the solution →Sodium chloride, potassium bromide, and lithium iodide are all compounds of Group 1 metals.
(a)[1 mark]State the usual colour of sodium chloride.
(b)[1 mark]Which one of these compounds is most likely to be soluble in water?
(c)[1 mark]Explain why most Group 1 metal compounds form colourless solutions.
Question 3
2 marks · Easy
Answer and see the solution →Explain why potassium dichromate(VI) is orange, while most compounds of sodium are white or colourless.
Question 4
3 marks · Easy
Answer and see the solution →A student observes three alkali metals exposed to air. The table shows her results.
Metal Time for surface to become dull / min Lithium 8 Sodium 4 Potassium 1 (a)[1 mark]Which metal reacts fastest with air?
(b)[1 mark]Which metal reacts slowest with air?
(c)[1 mark]State the trend in reactivity of these metals with air.
Question 5
1 mark · Easy
Answer and see the solution →State the usual colour of potassium bromide crystals.
Question 6
3 marks · Easy
Answer and see the solution →Describe what you would observe and name the product when sodium is heated strongly in air.
(a)[1 mark]State the colour of the flame when sodium burns.
(b)[1 mark]What is the appearance of the solid product formed?
(c)[1 mark]Name the compound produced in this reaction.
Question 7
2 marks · Easy
Answer and see the solution →A student heats a piece of potassium weighing 3.9 g in air. Potassium reacts fully to form potassium oxide (K$_2$O) according to the equation:
Calculate the maximum mass of potassium oxide formed from 3.9 g of potassium. (Relative atomic masses: K = 39, O = 16)
Question 8
2 marks · Easy
Answer and see the solution →A student dissolves 5.1 g of sodium chloride in water. Sodium chloride is a typical Group 1 metal compound. (Relative atomic masses: Na = 23, Cl = 35.5)
Calculate the number of moles of sodium chloride dissolved.