compare how does calcium react with hot water and cold water
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Metals low in the metal reactivity series do not react with water even at high temperature. Calcium (Ca) It reacts slowly with cold water. Magnesium (Mg) It reacts very slowly with hot water.
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After a second or so, the calcium metal begins to bubble vigorously as it reacts with the water, producing hydrogen gas, and a cloudy white precipitate of calcium hydroxide.
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