Rubidium and caesium
2 marks · NormalLithium, sodium, and potassium all react with water. State the name and a property of the gas produced in each reaction.
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Also accept: hydrogen; it is colourless; hydrogen; it explodes with a pop when ignited; hydrogen; it burns with a pale blue flame
Common mistakes: Incorrectly naming the gas as oxygen or carbon dioxide; Giving a metal hydroxide as the gas
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Marking points
B1 · 1 mark · States the gas is hydrogen
B2 · 1 mark · Correctly gives any property of hydrogen (e.g., colourless, burns with a squeaky pop, low density, burns with a flame)
Worked solution
The gas is hydrogen. It is colourless and, when tested with a lighted splint, burns with a squeaky pop.