Reactions of metals with water
1 mark · EasyState one observation when calcium reacts with cold water.
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Bubbles of gas are produced (effervescence).
Also accept: Cloudy mixture (white solid) forms; Granules sink then float; Mixture becomes warm
Common mistakes: Describing sodium/potassium observations instead
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B1 · 1 mark · Gives one valid observation from calcium with water (e.g., bubbles of gas, white solid forms, granules float).
Worked solution
One possible observation: Bubbles of hydrogen gas are produced.