Edexcel IGCSE Chemistry Alkali Metal Properties
Practise Edexcel IGCSE Chemistry alkali metal properties by comparing potassium and caesium reactions with water and their reactivity trend.
- Syllabus
- First assessment 2019
- Course
- Chemistry 4CH1
Exam points
- Compare potassium and caesium reactions with water, including fizzing, hydrogen and violence.
2.3 Predicting alkali metal properties question 1
[Maximum number: 2]
Lithium, sodium and potassium are the first three elements in Group 1 of the Periodic Table.
Caesium, Cs, is below potassium in Group 1.
Give a similarity and a difference between the reactions of potassium with water and caesium with water.
similarity
difference
similarity: both fizz/move on surface/ produce flame
ALLOW both melt/form a ball/produce a gas/ produce hydrogen/form an alkaline solution
difference caesium: faster/more violent reaction
ACCEPT reverse argument for potassium
ALLOW caesium explodes
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