Classify each of the following as an element or a compound: potassium carbonate, water, and Mg?

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Potassium Carbonate: K2Co3 - Compound (salt-potash). potassium carbonate n. A transparent, white, deliquescent, granular powder, K2CO3, used in making glass, enamels, and soaps. Also called potash. Water: H2O - Molecule Note: Pure water consists of hydrogen and oxygen, H2O, and is a colorless, odorless, tasteless, transparent liquid, which is very slightly compressible. At its maximum density, 39[deg] Fahr. or 4[deg] C., it is the standard for specific gravities, one cubic centimeter weighing one gram. It freezes at 32[deg] Fahr. or 0[deg] C. and boils at 212[deg] Fahr. or 100[deg] C. (see Ice, Steam). It is the most important natural solvent, and is frequently impregnated with foreign matter which is mostly removed by distillation; hence, rain water is nearly pure. It is an important ingredient in the tissue of animals and plants, the human body containing about two thirds its weight of water. Mg: Magnesium - Element mag·ne·si·um ( P ) Pronunciation Key (mg-nz-m, -zhm) n. Symbol Mg A light, silvery-white, moderately hard metallic element that in ribbon or powder form burns with a brilliant white flame. It is used in structural alloys, pyrotechnics, flash photography, and incendiary bombs. Atomic number 12; atomic weight 24.305; melting point 649°C; boiling point 1,090°C; specific gravity 1.74 (at 20°C); valence 2. See table at element. Mar 06 06, 6:45 PM

minuscule_

Compound compound element. Salt, water and Mg is a volatile mix, almost inextinguishable. http://en.wikipedia.org/wiki/Potassium_carbonate http://www.absoluteastronomy.com/reference/magnesium Mar 06 06, 9:25 PM

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What is another name for Potassium Carbonate? How would you classify each of the following, as a pure substance or a mixture: soapy water, hydrogen gas, and sodium chloride? What gases are produced when acids react with a carbonate compound, and what gases are produced when acids react with a hydrogen carbonate compound? In measurement of liquids, is a cc the same as an mg?

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