exam 2B key

exam 2B key - Chemistry 1C, Exam 2 May 21, 2008 First...

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Chemistry 1C, Exam 2 First letter of your last name: _________ May 21, 2008 FORM B Name ( last, first ): _____________________________________________ Perm #: ____________________________ INSTRUCTIONS: All cell phones and portable electronic devices must be turned off for the duration of the exam. SCANTRON FORM: Use a PENCIL 1) write you name on the form (front and back) 2) Bubble in FORM B 3) Bubble in your Perm number (7 digits only) An information page is provided separately. No other notes or books are allowed. There are 5 pages and 21 questions. Each multiple choice question is worth 1 point. Turn in the exam and Scantron form. 1. When a substance melts, what are the signs of Δ H and Δ S? Δ H Δ S a) positive positive b) positive negative c) negative positive d) negative negative e) positive Δ S = 0 2. When added to water, ammonium nitrate, [NH 4 ][NO 3 ], spontaneously dissolves and produces very cold solutions. What are the signs of Δ H and Δ S? Δ H Δ S a) positive positive b) positive negative c) negative positive d) negative negative e) positive Δ S = 0 3. The specific heat capacity of a substance is defined as the amount of energy required to increase the temperature of 1 gram of that substance by 1 ºC. How much energy does it take to convert 1.00 g of ice at -10 °C to water at 25 °C? (Specific heat capacities: ice, 2.1 J·g -1 ·°C -1 ; liquid water 4.2 J·g -1 ·°C -1 ; Δ H fusion = 6.01 kJ/mol) a) 105 b) 126 c) 334 d) 460 e)586 1
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4. Calculate the molality of a 2.20 M solution of nitromethane (CH 3
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exam 2B key - Chemistry 1C, Exam 2 May 21, 2008 First...

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