Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Rubidium and caesium
19 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →State two observations you would expect when a piece of sodium is added to water. Explain how these observations differ from the reaction of potassium with water.
Question 2
5 marks · Hard
Answer and see the solution →The table below shows some properties of Group 1 metals at room temperature.
Metal Melting Point (°C) Lithium 181 Sodium 98 Potassium 64 Rubidium 39 Caesium 29 (a)[1 mark]Describe the trend in melting point as you go down Group 1 from lithium to caesium.
(b)[1 mark]Predict the appearance (physical state and colour) of caesium at room temperature.
(c)[3 marks]Explain, in terms of atomic structure, the trend in reactivity from lithium to caesium.
Question 3
2 marks · Hard
Answer and see the solution →Describe the appearance of lithium and potassium at room temperature. State one difference you would notice between them by observation.