Practice Midterm #2 Solutions

Practice Midterm #2 Solutions - 1 Chemistry 102 Practice...

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Unformatted text preview: 1 Chemistry 102 Practice Midterm Last Name (please print) First Name Signature ID Number Instructions: 1. This exam has 5 questions . Make sure you have a complete exam and write your name on pages detached from the exam. 2. This is a closed-book examination. 3. Place your answers on the FRONT SIDE of each page and CLEARLY NOTE any work on the back side of a page. 4. Exams written in pencil are not eligible for re-grading . 5. You may use any approved calculators. Problem Maximum mark Mark received 1 10 2 8 3 9 4 8 5 8 Total S O L U T I O N S 2 1. (8 marks) (a) (3 marks) Determine if the following substances yield acidic, basic or neutral aqueous solutions: Lithium hypochlorite:_____________ basic NH 4 F : ______________ acidic Ka (NH 4 ) = Kw/Kb = 5.6x10-10 ; Kb (F- ) = Kw/Ka= 1.5 x 10-11 [CH 3 NH 3 ]CN : ______________ basic (methylammonium cyanide) Ka (CH 3 NH 3 ) = Kw/Kb = 2.4x10-11 ; Kb (CN- ) = Kw/Ka= 1.6 x 10-5 (b) (2 marks) Write the dominant acid/base equilibrium reaction for each of the following solutions: A solution was produced from adding NaClO 2 (s) to water: ClO 2- (aq) + H 2 O (l) HClO 2 (aq)+ OH- (aq) A 1.0 M solution of HCN (aq) is treated with an equal volume of 1.0 M NaOH (aq): CN- (aq) + H 2 O (l) HCN (aq)+ OH- (aq) (c) ( 3 marks) Using the information for these reactions at 500 o C: 1) 2 NO 2 (g) 2 NO (g) + O 2 (g) K = 1.95 10-5 2) 2 N 2 O (g) 2 NO (g) + N 2 (g) K = 192.35 3) 2 NO 2 (g) N 2 O 4 (g) K = 4 determine the equilibrium constant for this reaction also at 500 o C: 4) 2 N 2 O (g) + O 2 (g) 2 NO 2...
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Practice Midterm #2 Solutions - 1 Chemistry 102 Practice...

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