Thermochemistry Questions and Answers, Exercises of Chemistry

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Thermochemistry practice problems 1) How can energy be transferred to or from a system? A) Energy can only be transferred as potential energy being converted to kinetic energy. B) Energy can be transferred only as heat. Energy can be transferred only as work. D) Energy can be transferred as heat and/or work. 2) Which of the following is an example of a state function? A) The length of time it takes to go from New York to Los Angeles B) The mileage traveled going from San Francisco to Los Angeles The amount of time it takes to change the channel when Gossip Girl comes on. D) The difference in altitude between Chicago and Denver 3) Which of the following is NOT a state property? A) pressure B) temperature © internal energy D) enthalpy 4) Which of the following is the best example of an isolated system? A) water in a styrofoam coffee cup B) liquid in a beaker with a watch glass over it ©) soda in an unopened soft drink can D) coffee in a closed thermos bottle 5) How does a closed system differ from an open system? A) A closed system does not do any work on the surroundings. B) A closed system cannot exchange heat with the surroundings. Energy is conserved in a closed system, but not in an open system. D) A closed system cannot exchange matter with the surroundings. 6) A chemical reaction where heat is transferred to the surroundings is a(n) Ex OTHERMIC 7) Which of the following is an endothermic process? A) jet fuel burning in a jet engine B) combustion of methane © freezing of water D) vaporization of water ] 8) Which is true if AH = - 95 J? A) Both the system and the surroundings are gaining 95 J. B) Both the sysiem and the surroundings are losing 95 J. e the Surroundings are losing 99 3 Ww 1) 2) 3) 4) reaction. 8)