10 Exam 4 key - Chemistry 1304.002 Exam 4(100 points...

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Chemistry 1304.002 Name (please print) Exam 4 (100 points) April 7, 2010 On my honor, I have neither given nor received unauthorized aid on this exam. Signed Date 1. (4 points) Arrange the following acids from weaker to stronger. HBrO 2 , HBrO 3 , HBrO, HIO < < < weakest strongest 2. (8 points) A Lewis acid (definition) and a Lewis base . Thus in the following reaction is a Lewis base and is a Lewis acid. B(OH) 3 + OH - → B(OH) 4 - B O O H H O H O H O B O O O H H H H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . + 3. (4 points) Label each of the following aqueous solutions as acidic ( A ), a basic ( B ), neutral ( N ), or amphoteric ( Amp ) NO 2 Cs 2 O Al 2 O 3 Pb(OH) 2 4. (4 points) Predict the sign (positive or negative) of Δ S for each of the following reactions or systems. a. O 2 ( g ) → 2 O ( g ) b. desalination (removing salt) of water 5. (5 points) A certain electrochemical cell has for its cell reaction: Zn + HgO → ZnO + Hg Which half-reaction is occurring at the anode? ( PLEASE circle ONLY the letter of your answer.)
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