Chapter 4 Quiz 1

Chapter 4 Quiz 1

Chapter 4 Quiz 1
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1		This is the Lewis structure for ethanol, C₂H₅OH. Calculate the energy change associated with breaking all of the bonds in ethanol.
			A)	1574 kJ
			B)	2772 kJ
			C)	2883 kJ
			D)	3239 kJ


2		Which equation represents the process of "cat cracking," producing more useful molecular weight fractions from crude oil?
			A)	C₁₆H₃₄ + catalyst ----> C₈H₁₈ + C₈H₁₆
			B)	2 C₂H₆ + 7 O₂ + catalyst ----> 4 CO₂ + 6 H₂O
			C)	C₄H₁₀ + C₃H₆ + catalyst ----> C₇H₁₆
			D)	CH₂CH₂ + H₂O + catalyst ----> CH₃CH₂OH


3		Modern fossil fuel power plants do not operate anywhere near 100% efficiency. Why not?
			A)	Although 100% efficiency is possible, it is too expensive to design the plant to operate with this high of an efficiency.
			B)	100% efficiency is impossible. Organized energy is always being transformed into random motion, limiting efficiency.
			C)	Although 100% efficiency is possible, the Law of Conservation of Energy governs the conversion of energy from one form to another.
			D)	100% efficiency is impossible. One of the driving forces for any chemical reaction is the release of heat energy.


4		Which structure shows the same structural isomer as the isomer of pentane shown here? (All hydrogen atoms have been omitted for clarity.)
			A)
			B)
			C)
			D)


5		Which line segment in the diagram represents the net energy change for this reaction? A + B ----> C + D
			A)	1
			B)	2
			C)	3
			D)	4


6		How much energy will be required to break the bonds between nitrogen atoms in one mole of nitrogen gas, N₂?
			A)	160 kJ
			B)	428 kJ
			C)	578 kJ
			D)	946 kJ


7		Which balanced chemical equation represents a process of complete combustion of a hydrocarbon?
			A)	2 C₈H₁₈(l) + 17 O₂(g) ----> 16 CO (g) + 18 H₂O (g) + heat
			B)	C₂H₄(g) + 3 O₂(g) ----> 2 CO₂(g) + 2 H₂O (g) + heat
			C)	C₆H₁₂O₆(s) ----> 2 C₂H₅OH (l) + 2 CO₂(g) + heat
			D)	C₂H₄(g) + H₂(g) ----> C₂H₆(g) + heat


8		At which location in this distillation column will petroleum gas, C₁ - C₄ hydrocarbons, be most likely to be collected?
			A)	A
			B)	B
			C)	C
			D)	D


9		Which statement is correct at the present time for total oil used in the U.S.?
			A)	More than 50% of the oil used in the U.S. is from domestic production.
			B)	More than 50% of the oil used in the U.S. is imported.
			C)	More than 50% of the oil used in the U.S. is from the Alaskan North Slope.
			D)	More than 50% of the oil used in the U.S. is from other sources, such as natural gas liquids.


10		Statement: Energy is neither created nor destroyed in a chemical reaction. This statement of the Law of Conservation of Energy is also known as the
			A)	First Law of Thermodynamics.
			B)	Second Law of Thermodynamics.
			C)	Third Law of Thermodynamics.
			D)	driving force for a chemical reaction.


11		How many kJ of food energy do you get from eating a serving of a snack labeled as providing 150 Cal per serving?
			A)	3.6 x 10¹ kJ
			B)	1.5 x 10² kJ
			C)	2.8 x 10² kJ
			D)	6.3 x 10² kJ


12		Which is a correct statement about fossil fuels?
			A)	Fossil fuels are produced by large farming operations, such as growing soybeans or corn. They are renewable resources.
			B)	Fossil fuels are carbon-containing skeletons from animals, which have undergone decay under high temperatures and pressure. They are renewable resources.
			C)	Fossil fuels are gaseous carbon-based fuels such as carbon monoxide, natural gas, and carbon dioxide. They are renewable resources.
			D)	Fossil fuels originated as plant or animal matter 150-300 million years ago. They are nonrenewable resources.


13		Which statement is correct?
			A)	Forming bonds always requires energy. It is an exothermic process.
			B)	Forming bonds always requires energy. It is an endothermic process.
			C)	Forming bonds always releases energy. It is an endothermic process.
			D)	Forming bonds always releases energy. It is an exothermic process.


14		Which graph shows an exothermic reaction with curve A being the catalyzed reaction and curve B being the uncatalyzed reaction?
			A)
			B)
			C)
			D)


15		Consider the single bond energy values: H-H = 436 kJ/mol; C-H = 416 kJ/mol; N-H = 391 kJ/mol; O-H = 467 kJ/mol. Which lists the bonds in the order of weakest bond to strongest bond?
			A)	H-H, H-C, H-N
			B)	H-H, H-C, H-O
			C)	H-C, H-H, H-O
			D)	H-N, H-H, H-C

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