Separate samples of magnesium and calcium are added to an excess of dilute sulfuric acid. The observations are summarised in the table. metal: magnesium, observations: vigorous reaction, bubbles of gas produced, magnesium completely dissolves metal: calcium, observations: vigorous reaction initially, bubbles of gas produced, reaction soon stops and leaves most of the calcium unreacted Which statement explains the difference in these observations?

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Why does barium react more rapidly with cold water than magnesium does?

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