Project #4951 - chem

 Part 1 of 1 -

Choose the letter of the answer that best completes the statement or answers the question.

The specific heat capacity of a substance is the amount of heat needed
 A. to raise the temperature of one gram by 1 K. B. to raise the temperature of one mole by 1 K. C. to raise the temperature of one gram by 1°F. D. to raise the temperature of one mole by 1°F.
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The molar heat capacity of iron (M = 55.8) is 25.1 J/K•mol. How much energy must be added to increase the temperature of 111.6 g of iron by 10 K?
 A. 10 J B. 251 J C. 502 J D. 1116 J
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For a given substance, the term ∆H refers to
 A. the total energy. B. the total enthalpy. C. the change in enthalpy. D. the change in temperature.
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How much energy does an aluminum (M = 27.0) sample gain if its molar heat capacity is 24.2 J/mol•K, its mass is 13.5 g, and it is heated from 10.0°C to 40.0°C?
 A. 24.2 J B. 242 J C. 363 J D. 726 J
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If the ∆H of a system is measured as -177 kJ, the change is
 A. endothermic. B. exothermic. C. either endothermic or exothermic. D. reversible.
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During an endothermic reaction, total energy
 A. decreases. B. increases. C. stays the same. D. cannot be determined.
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The enthalpy of formation of an element is
 A. negative. B. positive. C. zero. D. negative or positive, depending on which element.
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The enthalpy of formation of a compound is -612 kJ/mol, and the products of its combustion have a total enthalpy of formation of -671 kJ. What is the enthalpy of combustion of this compound?
 A. -59 kJ/mol B. +59 kJ/ml C. -1283 kJ/mol D. +1283 kJ/mol
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According to Hess’s Law, the entropy of a reaction
 A. can be calculated from the standard entropies of the products and the reactants. B. increases as thermal energy is removed. C. increases as temperature decreases. D. is equal to zero for elements.
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What is the value of ∆G at 250 K for a reaction in which ∆H = -185 kJ/mol and ∆S = +2.00 kJ/mol•K?
 A. +315 kJ/mol B. -315 kJ/mol C. +685 kJ/mol D. -685 kJ/mol
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 Subject Science Due By (Pacific Time) 04/24/2013 11:00 pm
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