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

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1			Within the Earth, how does iron most commonly occur?
			A)	Fe
			B)	FeS
			C)	Fe2S3
			D)	FeO
			E)	Fe2O3
2			Which of the following processes is responsible for causing the atmosphere to become an oxidative environment?
			A)	volcanic outgassing and eruptions
			B)	photosynthesis
			C)	meteor impacts
			D)	combustion
			E)	radioactive emissions
3			Which type of process fixes the most nitrogen?
			A)	biological
			B)	atmospheric
			C)	industrial
			D)	agricultural
			E)	photosynthesis
4			The atmosphere contains approximately 700 billion metric tons of carbon dioxide. Every year, approximately 200 billion metric tons of carbon dioxide enter the atmosphere, and 200 billion metric tons are removed, so that a steady state exists in which there is little change in the total amount. Use this information to estimate the average residence time of a carbon dioxide molecule in the atmosphere.
			A)	14 billion years
			B)	3.5 billion years
			C)	350 years
			D)	14 years
			E)	3.5 years
5			Which of the following general process occurs when a mineral is roasted?
			A)	metal sulfide is reduced to the metal
			B)	metal oxide is reduced to the metal
			C)	metal is converted to metal oxide
			D)	metal sulfide is converted to metal oxide
			E)	metal oxide dissolves in aqueous solution
6			Which statement about the isolation and refining of copper is incorrect?
			A)	Chalcopyrite is a mixed sulfide of iron and copper.
			B)	The copper content of copper ores is often enriched by flotation.
			C)	Copper ores are leached by treating chalcopyrite with acid.
			D)	Copper metal is purified by electrolysis.
			E)	In electrolysis, precious metal impurities are recovered as "anode mud".
7			What word refers to the debris which is separated from a mineral during pretreatment of an ore?
			A)	slag
			B)	magnetite
			C)	leachate
			D)	flotate
			E)	gangue
8			Which of the following reactions is a good, small-scale laboratory method for preparing hydrogen?
			A)	3FeCl2(s) + 4H2O(l) ® Fe3O4(s) + 6HCl(g) + H2(g)
			B)	CH4(g) + H2O(g) ® CO(g) + 3H2(g)
			C)	2Na(s) + 2H2O(l) ® 2NaOH(aq) + H2(g)
			D)	CO(g) + H2O(g) ® CO2(g) + H2(g)
			E)	Zn(s) + 2HCl(aq) ® ZnCl2(aq) + H2(g)
9			What is the energy needed to produce a piece of aluminum foil 1.00 m ´ 30.0 cm ´ 0.0200 mm by reduction of aluminum oxide? The energy needed to produce elemental aluminum by electrolytic reduction of Al2O3 is 365.8 kJ/mol. The density of aluminum is 2.70 g/cm3.
			A)	61.0 kJ
			B)	2.19 ´ 103 kJ
			C)	610 kJ
			D)	219 kJ
			E)	21.9 kJ
10			What compound serves as a basic flux to remove oxide impurities in the basic-oxygen process for steel manufacture?
			A)	NaOH
			B)	Ca3(PO4)2
			C)	CaO
			D)	CO
			E)	Fe2O3
11			The most common source for commercial production of aluminum is
			A)	cinnabar
			B)	galena
			C)	bauxite
			D)	aluminite
			E)	beryl
12			What is the Bayer process used for?
			A)	to mine elemental sulfur
			B)	to fix nitrogen as ammonia
			C)	to purify nickel metal
			D)	to obtain elemental sodium by electrolysis
			E)	to separate Al2O3 from bauxite
13			Apatite ores have the general formula Ca5(PO4)3X. If X- can be F-, Cl- or OH-, what is the range of phosphorus percentages (by weight) in these apatite minerals?
			A)	17.84% to 18.50%
			B)	18.43% to 18.50%
			C)	17.84% to 18.23%
			D)	54.71% to 56.74%
			E)	61.47% to 61.71%
14			Which substance is used as the oxidizing agent in bleach and for producing monomers for the plastics industry?
			A)	O3
			B)	Cl2
			C)	H2O2
			D)	NaOH
			E)	I2
15			Select the correct statement about the production of sulfuric acid.
			A)	In most countries, the source of sulfur for this process is sulfur dioxide occurring in natural gas.
			B)	The Haber process is used to mine underground deposits of elemental sulfur.
			C)	Disulfuric acid is H4S2O8.
			D)	In the contact process, sulfur dioxide is oxidized to sulfur trioxide over a V2O5 catalyst.
			E)	Sulfur trioxide is dissolved in water to yield the sulfuric acid end product.