Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Rubidium and caesium
19 practice questions
Practice questions
1–10 of 19
Question 1
1 mark · Easy
Answer and see the solution →State the trend in reactivity as you go down Group 1 in the Periodic Table.
Question 2
3 marks · Easy
Answer and see the solution →(a)[1 mark]State one physical property of sodium.
(b)[1 mark]Give one chemical property common to lithium, sodium and potassium.
(c)[1 mark]Describe the appearance of potassium at room temperature.
Question 3
2 marks · Easy
Answer and see the solution →A student adds 0.10 g of lithium to excess water. Calculate the maximum mass of hydrogen gas that can be produced. (Ar: Li = 7, H = 1)
Question 4
2 marks · Easy
Answer and see the solution →Explain, in terms of atomic structure, why rubidium is more reactive than sodium.
Question 5
3 marks · Easy
Answer and see the solution →The table shows the melting points of three Group 1 metals.
Metal Melting point (°C) Lithium 181 Sodium 98 Potassium 64 (a)[1 mark]Which metal in the table has the highest melting point?
(b)[1 mark]Describe the trend in melting point as you go down Group 1 using the data.
(c)[1 mark]Suggest one reason why alkali metals are stored under oil, based on their properties.
Question 6
1 mark · Easy
Answer and see the solution →Name the gas produced when potassium reacts with water.
Question 7
3 marks · Easy
Answer and see the solution →(a)[1 mark]Predict the physical state and colour of caesium at room temperature.
(b)[2 marks]Explain why caesium reacts even more rapidly with water than potassium.
Question 8
2 marks · Easy
Answer and see the solution →A piece of potassium weighs 0.78 g. Calculate the maximum mass of potassium hydroxide formed when this reacts completely with water. (Ar: K = 39, O = 16, H = 1)
Question 9
2 marks · Normal
Answer and see the solution →State two physical properties that are characteristic of lithium, sodium, and potassium.
Question 10
4 marks · Normal
Answer and see the solution →(a)[1 mark]Write a word equation for the reaction of sodium with water.
(b)[2 marks]Describe two visible observations when a small piece of potassium is added to water.
(c)[1 mark]Give the names of the two products formed in the reaction between potassium and water.