Making predictions using the reactivity series
1 mark · EasyA piece of rubidium metal is added to cold water. Predict what will happen. Use the reactivity series in your answer.
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Rubidium will react very rapidly (or violently) with cold water because it is above sodium and potassium in the reactivity series.
Also accept: Rubidium reacts explosively with cold water as it is very high in the reactivity series.; It reacts violently with water because it is above potassium.
Common mistakes: Saying there is no reaction; Confusing rubidium with metals lower in the reactivity series
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Marking points
B1 · 1 mark · States that rubidium will react rapidly (or violently) with cold water due to its high position in the reactivity series.
Worked solution
Rubidium is above sodium and potassium in the reactivity series, so it will react very quickly and violently with cold water.