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Calcium hydride (CaHz) is so reactive with water that it can be used to remove traces of water from solvents other than water. If 24.6 g of calcium hydride is added to a large volume of solvent that contains 14.0 g of water, which of these remains, water or calcium hydride, after the reaction is complete? The reaction is: CaHz(s) + 2H2O(7+ Ca(OH)2(s) + 2H2(g) . Select one: a. CaHy will be left over. b. Water will be left over. c. Both will be completely consumed. d. There is no way to tell.
U.S. Lime & Minerals is a company that produces quicklime, Cao, by heating calcium hydroxide, Ca(OH)2. What is the percent yield if 45 grams of quicklime are obtained from 1 mole of calcium hydroxide? (Ignore significant figures.) Ca(OH)2 CaO + H2O Select one: a. 61% b. 80% a c. 45% d. 100% () e. 90%
Filtration can be used to separate components in a mixture based on differences in Select one: a. solubility. b. boiling point. O c. melting point. O d. particle size. e, color.
Which of the following is a pure substance? Select one: O a. mineral water b. blood c. brass (an alloy of copper and zinc) d. sucrose (table sugar) O e. beer e.
If you had equal masses of each of the following substances, which would occupy the greatest volume? Select one: a. ice (ď=0.917 g/mL) am b. water (d = 0.997 g/mL) O c. beeswax (d = 0.960 g/mL) d. cocoa butter (d = 0.910 g/mL) e. aluminum (d = 2.70 g/mL)
A solid directly forming a vapor or gas is called Select one: O a. sublimation. o b. deposition. c. melting. d. freezing. e. vaporization.