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CALCIUM (Reactions with ... (Oxygen (When it burns, it burns with a…
CALCIUM
Reactions with ...
Oxygen
When it burns, it burns with a yellowish-red flame. When it is exposed to air, it develops a gray-white coating because it reacts with the oxygen in the air to form a coating of calcium oxide (lime.)
Water
Calcium metal burns hot if ignited, and it reacts violently with water to form the strongly-alkaline calcium hydroxide that can cause chemical burns.
Acid
Calcium compounds aren't dangerous unless they are strongly alkaline or acidic or if they are poisonous due to the other parts of the compound
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Strongly alkaline and reactive with any body fluids such a sweat, calcium metal burns flesh exposed to it. Do not touch it.
What is it used for ?
Calcium compounds are nearly everywhere in our bodies. In fact, calcium is an essential nutrient that is needed by the human body to help build strong bones and teeth.
Calcium is important for our body to run. It helps build strong bones and teeth, and it allows our muscles and brain cells work.
Calcium is an important substance in the building industry, because calcium hydroxide (Ca(OH)2 is used in cement and mortar. Calcium carbonate is also used in plastics and adhesives as a filler. Because calcium oxide (CaO) neutralizes acid it can be used to decrease the effects of acid rain in rivers and lakes.
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Appearance
Calcium is a soft, gray metal 
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