The most common chemical formulas for chalk are CaCO3 (calcium carbonate) and CaO (calcium oxide). Chalk is a soft, porous sedimentary rock that is a form of limestone and is mainly composed of calcite (calcium carbonate... More » Science Chemistry

The chemical formula for gypsum is CaSO4.2H2O. Gypsum is also known as hydrous calcium sulfate. Dehydrated gypsum is colloquially known as plaster of Paris, which becomes gypsum again with the addition of water. More » Science Chemistry Atoms & Molecules

Chalk is calcium carbonate and has the same chemical composition as limestone, marble, ground calcium carbonate and precipitated calcium carbonate. Chalk, like the other types of calcium carbonate, is in the form of calc... More » Science Chemistry
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CaO is the chemical formula for lime, which is also called calcium oxide. Calcium oxide is produced from minerals like limestone through a heating process that removes carbon dioxide. More » Science Chemistry

Natural chalk is a common form of calcium carbonate. Unlike other, chemically similar minerals, chalk deposits are laid down by living organisms known as coccolithophores. These microscopic animals thrive in the warm, sh... More » Science Chemistry

The reaction between chalk and vinegar is a neutralization reaction between calcium carbonate and acetic acid to produce water, carbon dioxide and calcium acetate. Carbon dioxide is a gas that causes the reaction to bubb... More » Science Chemistry

Blackboard and sidewalk chalk can be made from either calcium carbonate (CaCO3) or calcium sulfate, also known as gypsum (CaSO4. Calcium carbonate is formed by the slow underwater compression and accumulation of the calc... More » Science Chemistry