Crossword-Solution: CAC 3 letters, 4 clues 🏆 scrabble score: 7

Where is a town called Cac—Cac—Carac—Caracas City, I think, they called it?” “How dare you wake me up for that?” said the school teacher.

Put into the usual form of an equation, the reaction proceeds thus-- (1) CaC_2 + H_2O = C_2H_2 + CaO.

Thus the symbol CaC_2, comes to convoy three separate ideas: (_a_) that the substance referred to is a compound of calcium and carbon only, and that it is therefore a carbide of calcium; (_b_) that it is composed of one chemical part or atom of calcium and two atoms of carbon; and (_c_) that it contains 40 parts by weight of calcium combined with twice twelve, or 24, parts of carbon.

The equations representing these actions are: C_2H_2 + CO = H_2O + 3C 2C_2H_2 + CO_2 = 2H_2O + 5C CaC_2 + CO = CaO + 3C 2CaC_2 + CO_2 = 2CaO + 5C By urging the temperature, or by increasing the pressure at which the gases are led over the carbide, the free carbon appears in the graphitic condition; at lower temperatures and pressures, it is separated in the amorphous state.

This gas was acetylene, and we can represent the reaction thus: CaC_{2} + 2 H_{2}O --> C_{2}H_{2} + CaO_{2}H_{2} calcium carbide _added_ to water _ gives_ acetylene _and_ slaked lime We are all familiar with this reaction now, for it is acetylene that gives the dazzling light of the automobiles and of the automatic signal buoys of the seacoast.