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It would be a compound, made of Calcium and Oxygen.
Calcium carbonate is the compound made from the elements oxygen, calcium, and carbon. It is commonly found in rocks, shells, and pearls.
Water, H2O
None. Calcium and oxygen are both elements that can combine to form the compound calcium oxide, CaO.
calcium carbonate, CaCO3
Chalk is primarily composed of calcium carbonate, which is a chemical compound. Calcium carbonate is made up of calcium, carbon, and oxygen atoms in a specific ratio, giving chalk its characteristic properties.
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Hematite is not made from calcium carbonate.
A compound is a mixture of elements. As the name implies, CH (or calcium hydroxide) is made up of calcium and hydrogen. Calcium and Hydrogen are elements. Thus, calcium hydroxide is a compound.
White ash is a compound, not an element. It is primarily composed of calcium carbonate, which is a compound made up of calcium, carbon, and oxygen atoms.
Hydrosulfuric calcium bromide is not a known chemical compound. It seems there may be a misunderstanding or confusion in the terminology. Calcium bromide is a compound made of calcium and bromine atoms. Hydrosulfuric acid would be made up of hydrogen, sulfur, and oxygen.
Calcium sulfate (CaSO4), also known as gypsum or plaster of Paris, is made from calcium, sulfur, and oxygen. This compound is commonly used in construction materials, soil amendments, and as a desiccant.