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Exam 2.Form B.YellowVersion.2008

Exam 2.Form B.YellowVersion.2008 - Chem 1B Exam 2 FORM Name...

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1 Chem. 1B Exam 2 FORM B First letter of your last name: February 27, 2008 Name: Last Name First Name Perm # INSTRUCTIONS: No hats allowed. No sharing of calculators. Cell Phones, iPods, headsets, etc. must be turned off and put away. SCANTRON FORM: Use a PENCIL 1) Write your name 2) Bubble in FORM B 3) Bubble in your PERM number (7 digits only, no extra numbers) INFORMATION PAGE: An information page is provided separately. No other notes or books are allowed. There are 16 questions. Each question is worth 5 points. Select only ONE answer for each question. Work out the problems and write your answers on this exam. Turn in the Scantron form only . Keep the exam so you can check your work and your answers. 1. In the reaction below, what substance is reduced? 2 VO 2 + (aq) + 4 H + (aq) + Cd (s) 2 VO 2+ (aq) + 2 H 2 O ( l ) + Cd 2+ (aq) a) VO 2+ b) Cd 2+ c) Cd d) VO 2 + Answers are given at the end of the exam. e) H + 2. Electrolysis of a molten metal choride (MCl 2 ) using a current of 2.50 A for 149 seconds deposits 0.217 g of metal at the cathode. Determine the molar mass of the metal.
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2 Answer questions 3, 4 and 5 using the following half reactions: E o (V) Au 3+ + 3 e Au (s) 1.50 Cl 2 + 2e 2 Cl 1.36 NO 3 + 4 H + + 3 e NO + 2 H 2 O 0.96 ClO 2 + e ClO 2 0.95 Ag
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