| calcium |
a soft, silver-white substance that is one of the chemical elements. Calcium is found in many kinds of rocks. It is used by the body for building healthy bones and teeth. (symbol: Ca) |
| carbon |
a chemical element found in all living things. Pure carbon occurs as diamond or graphite. It is also often found in compounds with other elements. (symbol: C) |
| cell |
a device that makes electricity by chemical means. [1/4 definitions] |
| chemical |
a substance used in or produced by a chemical process. [1/3 definitions] |
| chemistry |
chemical properties and phenomena. [1/2 definitions] |
| chemistry lab |
in a school, a place where students studying chemistry can observe chemical reactions and carry out small experiments. |
| chlorine |
a substance that is one of the chemical elements. It combines with sodium to form table salt. It is also used in making bleach. Chlorine is poisonous in its pure gas form. (symbol: Cl) |
| chromium |
a shiny, silver-gray metal that is one of the chemical elements. Chromium does not rust easily. It is used on surfaces, such as the metal trim on cars, because it stays shiny. It can be combined with other metals to form alloys. (symbol: Cr) |
| Cl |
symbol of the chemical element chlorine |
| Co |
symbol of the chemical element cobalt. |
| cobalt |
a brittle silver-white metal that is one of the chemical elements. Cobalt is sometimes added to other metals in alloys to make them harder. It is also used in making some kinds of paint. (symbol: Co) |
| compound1 |
a substance formed by combining two or more chemical elements. [1/6 definitions] |
| copper |
a reddish brown metal that is one of the chemical elements. Copper is used to make pipes, because it does not easily rust. It is also used to make wires, because it is an excellent conductor of electricity. It can be combined with other metals to make alloys such as brass and bronze. (symbol: Cu) [1/4 definitions] |
| Cr |
symbol of the chemical element chromium. |
| detergent |
a chemical substance in the form of a liquid or powder used for washing things. |
| drug |
a substance that causes a chemical change in the body and may cause addiction; narcotic. [1/3 definitions] |
| enzyme |
a protein that helps a chemical reaction take place within a living thing. |
| exposure |
contact with something, such as a chemical or germ, that may cause physical damage or illness. [1/6 definitions] |
| F2 |
symbol of the chemical element fluorine. |
| Fe |
symbol of the chemical element iron. |
| ferment |
a substance that causes the chemical change of fermentation. [2/4 definitions] |