230_Sp10_E1_blank(1) - CHEM 230 Sp10 Exam 1 p1 Name_ 1) (5...

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CHEM 230 Sp10 Exam 1 p 1 Name_______________________ 1) ( 5 points ) Which of the following would ensure that the temperature of a gas is doubled? ( Circle ALL that apply. There may be more than one correct answer.) A) Doubling the pressure and doubling the volume of a gas in a closed system. B) Doubling the v rms of a gas in a closed system. C) Halving the v rms of a gas in a closed system. D) Doubling the number of moles of gas under constant pressure and volume. E) Doubling the volume under constant pressure of a gas sin a closed container 2) ( 4 points ) At constant pressure and temperature, which of the following statements is true for the reaction: N 2 O 5 (s) 2NO 2 (g) + ½ O 2 (g), Δ H o = 109.5 kJ ( Circle the ONE best answer.) A) Δ H is independent of the physical states of the reactants. B) Δ H = Δ U C) w = 0 D) Δ H < Δ U E) Δ H > Δ U 3) ( 4 points ) Circle the letter of the sample that will end up at the HIGHER final temperature: A) a 10 g sample of a substance with a C s = 1 J/(g o C) heated for 5 minutes at a rate of 10 J/min B) a 5 g sample of a substance with a C s = 2 J/(g o C) heated for 5 minutes at a rate of 10 J/min C) Both samples will be the same temperature after 5 minutes 4) ( 4 points ) Circle the letter of the block that has the LARGER increase in its temperature: A) a 10 g block of copper initially at 25 o C is heated for 10 minutes at a rate of 10 J/min B) a 10 g block of copper initially at 50 o C is heated for 10 minutes at a rate of 10 J/min C) Both blocks will have the same increase in temperature after 10 minutes 5) ( 4 points ) Which of the following is most likely to have a positive Δ S value? ( Circle the ONE best answer.) A) He(g), (273K, 2 atm)
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230_Sp10_E1_blank(1) - CHEM 230 Sp10 Exam 1 p1 Name_ 1) (5...

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