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How many mg of calcium is present in a 500 mg tablet of calcium carbonat?
A calcium carbonate supplement is 40% calcium, which is higher than any other calcium supplement.
A vitamins expiration date has passed It was supposed to contain 500 mg of Calcium but it has lost 325 mg of Calcium How many mg of Calcium is left?
175
Calcium plus H2O equals Hydrogen?
Calcium and water react to form calcium hydroxide and hydrogen. Ca + 2H2O --> Ca(OH)2 + H2
If a vitamins expiration date has passed It was supposed to contain 500 mg of Calcium but it has lost 325 mg of Calcium How many mg of Calcium is left?
A vitamin's expiration date has passed. It was suppose to contain 500 mg of Calcium, but it has lost 325 mg of Calcium. How many mg of Calcium is left? Is this a trick question? Calcium is not a vitamin, but an element. Calcium, being an element, can't be 'lost', since, according to the laws of conservation, matter cannot be created nor destroyed (except in nuclear reactions). Nor can calcium be converted to something else, merely reacted with to form some other calcium compound, thus is still there. Radioactive isotopes of Calcium could decay over long periods, so it also depends on how long the expiry date has passed, and what isotopes are involved. If you somehow meant to type vitamin C instead of Calcium, then the matter is simple arithmetic and doesn't need to be answered on this forum, I would think.
Which is more reactive Mg or Ca Why?
Calcium is more reactive. In the periodic table, Calcium is directly below Magnesium, which means that a calcium atom is larger than a magnesium atom. This means that the electrostatic attraction between the valence electrons of calcium and the nucleus is weaker than in magnesium(larger distance, smaller force). So, the valence electrons of calcium can easily be lost to form Ca2+ , which translates to Calcium being the more reactive metal.
