Chemistry: Molecular Nature of Matter and Change, 6th Edition (Silberberg)

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1			What is the most abundant element in or on the Earth?
			A)	hydrogen
			B)	oxygen
			C)	aluminum
			D)	silicon
			E)	iron
2			Which of the following occurs as the free element (i.e., uncombined) in the Earth's crust?
			A)	sodium
			B)	chlorine
			C)	potassium
			D)	fluorine
			E)	oxygen
3			The conversion of carbon dioxide to carbohydrates in photosynthesis is an example of ______________.
			A)	condensation
			B)	oxidation
			C)	fixation
			D)	combustion
			E)	an exothermic reaction
4			Phosphates can be removed from polluted bodies of water by precipitation. Which of the following compounds is insoluble and has been precipitated for this purpose?
			A)	Ca(H2PO4)2
			B)	NH4H2PO4
			C)	K3PO4
			D)	FePO4
			E)	(NH4)3PO4
5			Pyrometallurgy is a procedure that uses ______ to separate a metal from its ore.
			A)	aqueous chemical properties
			B)	electrical processes
			C)	chemical properties
			D)	thermal properties
			E)	combustion
6			Which of the following processes selectively dissolves a metal present in an ore?
			A)	roasting
			B)	smelting
			C)	flotation
			D)	leaching
			E)	amalgamation
7			Which one of the following methods is used to purify metals such as zinc and mercury?
			A)	solvent extraction
			B)	alloying
			C)	distillation
			D)	chromatography
			E)	sublimation
8			Which of the following descriptions of how sodium metal is produced in the Downs cell is correct?
			A)	electrolysis of aqueous NaCl
			B)	electrolysis of aqueous NaOH
			C)	electrolysis of molten NaCl
			D)	electrolysis of molten NaOH
			E)	reduction of Na+ by Mg
9			The chlorides of sodium and potassium occur naturally together, but some sources are mostly NaCl and others mostly KCl. What is the range of chloride percentages (by weight) possible in mixtures of NaCl and KCl?
			A)	39.3% to 52.4%
			B)	64.9% to 90.7%
			C)	47.6% to 60.7%
			D)	39.45% to 90.7%
			E)	52.4% to 64.9%
10			Which equation represents the main reaction in a blast furnace?
			A)	2FeCO3 + C ® 2Fe + 3CO2
			B)	Fe2O3 + 3CO ® 2Fe + 3CO2
			C)	2Fe2O3 + 3C ® 2Fe + 3CO2
			D)	4Fe + 3SiO2® 2Fe2O3 + 3Si
			E)	Fe2O3 + 3C ® 2Fe + 3CO
11			Which of the following is an important mineral source of lead?
			A)	calcite
			B)	halite
			C)	galena
			D)	fluorite
			E)	plumbite
12			How many grams of the ore bauxite are required to obtain 1.000 kg of aluminum? Assume that the bauxite contains 75.0% Al2O3. Also assume complete recovery and complete reduction of the aluminum.
			A)	3970 g
			B)	2520 g
			C)	5190 g
			D)	1930 g
			E)	1330 g
13			Which of the following is used in steels, as a hydrogenation catalyst, and as protective layer under chromium plating?
			A)	Pd
			B)	Cu
			C)	Mg
			D)	Ni
			E)	Zn
14			Which of the following sets of substances is produced in the chlor-alkali process?
			A)	NaOH, Cl2 and O2
			B)	Na, Cl2 and H2
			C)	H2, Cl2 and O2
			D)	Na and Cl2
			E)	NaOH, H2 and Cl2
15			The Frasch process is used to
			A)	mine elemental sulfur
			B)	remove traces of water from organic solvents
			C)	oxidize sulfides of many metals to the corresponding sulfates
			D)	manufacture freon
			E)	manufacture nitric acid