eng-08spring-CHM2046C-e102x03-h3a

eng-08spring-CHM2046C-e102x03-h3a - University of North...

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University of North Florida NAME _____ ________________________ CHM 2046C, General Chemistry II Exam 3 Spring 2008 14 March 2008 Instructions: DO NOT BEGIN UNTIL GIVEN THE SIGNAL TO START. The time allotted for this examination is 50 minutes; nonetheless, this exam ends at 11:50 am. Only allowed calculators may be used on this exam. The first few pages include some potentially helpful information and the periodic table. There are two parts to this exam. o For part I, write your answers on the BROWN SCANTRON. Write the exam version next to your name o For part II, show all your work for full credit. No extra time will be given to transfer answers to the answer sheet. At the end of the examination, hand in the BROWN SCANTRON and partial credit portion before leaving the room. Make sure your name is on those pages. Potentially useful information 1 in = 2.54 cm (exactly) 1 lb = 453.59 g 1 L = 1.0567 qt 1 amu = 1.66053873 ×10 -24 g e = 1.60217653 × 10 -19 C ° C = 5 / 9 ( ° F – 32) ° F = 9 / 5 ° C + 32 K = ° C + 273.15 N A = 6.0221421×10 23 1 J = 1 kg·m 2 /s 2 1 Pa = 1 N/m 2 1 cal = 4.184 J (exactly) ( ) a b a ab b - = - + 2 2 2 2 x b b ac a = - ± - 2 4 2 are the solutions for ax 2 + bx + c = 0 . Δ G = Δ H – T Δ S R L atm mol K J mol K = = 008206 8 314 . . Δ G = Δ G° + RT ln Q Δ G° = – RT ln K K p = K c (RT) Δ n pH = –log[H 3 O + ] pOH = –log[OH - ] pKa = –log K a K w = 1.0 × 10 -14 at 25 °C Δ rxn = Σ Δ G f °(prod’s) – Σ Δ G f °(react’s) K a × K b = K w pH pK conjugate base acid a = + log [ _ ] [ ] Solubility rules: Aqueous ionic compounds containing acetates, nitrates, alkali metals and/or ammonium are ALWAYS soluble. chlorides, bromides, and iodides are soluble except with silver, mercury (I) and lead (II). sulfates are soluble except with mercury (I), lead (II), strontium and barium. sulfides and hydroxides are insoluble except with calcium, strontium, barium, alkali metals and ammonium.
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