Quiz 1 - 2(g ± a MgO 3(s C(s b MgO 2(s CO(g c Mg(s CO 3(g...

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Quiz 1 – Chemistry 103, Spring 2008 09 AM version 01 BUBBLE FORM: 1. ENTER YOUR NAME (last, first) AND ENTER BUBBLES 2. ENTER YOUR ID NUMBER AND ENTER BUBBLES 3. YOU MUST FILL OUT THE FOLLOWING TEST VERSION CODE ON THE BUBBLE FORM BY BLACKENING BUBBLES 4. WE RESERVE THE RIGHT TO MOVE YOU DURING THE EXAM AT ANY TIME, FOR ANY REASON Enter Test Version Code near the ID number under Birthdate header as shown below: BIRTHDATE DAY YR 09 01
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1) Calculate the pH of a 0.25 M solution of NaNO 2 . The pKa of HNO 2 is 3.14. (5 pts) a) 9.43 b) 7.95 c) 8.27 d) 8.86 e) 10.61 2) Consider 0.10 M aqueous solutions of the following acids and bases. Which set is correctly ordered in terms of decreasing pH (high pH ± low pH). (5 pts) a) Mg(OH) 2 > HNO 2 > H 2 SO 4 > CH 3 OH > NaCl b) NaCN > H 2 SO 4 > HNO 2 > Mg(OH) 2 > CH 3 OH c) CH 3 OH > Mg(OH) 2 > NaCN > HNO 2 > H 2 SO 4 d) H 2 SO4 > HNO 2 > CH 3 OH > Mg (OH) 2 > NaCN e) Mg(OH) 2 > NaCN > CH 3 OH > HNO 2 > H 2 SO 4 3) Using Lewis acid base concepts, predict the most likely product of the reaction below. (5 pts) MgO (s) + CO
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Unformatted text preview: 2 (g) ± ? a) MgO 3 (s) + C (s) b) MgO 2 (s) + CO (g) c) Mg (s) + CO 3 (g) d) MgCO 3 (s) e) MgCO 3 (s) + O 2 (g) 4) What is the pH of a 100. mL solution of 0.15 M formic acid (HCHO 2 ) (Ka = 1.7 * 10-4 ) after 1.5 g NaCHO 2 (MW = 68.01 g/mol) is added? (5 pts) a) 3.77 b) 3.94 c) 3.83 d) 3.62 e) 3.51 Questions 5-9, Lightning Round – 1 point each For questions 5 – 7, which term best describes an aqueous solution of each of the following compounds? 5) CaO (s) + H 2 O ± a) acidic b) basic c) neutral 6) SO 3 + H 2 O ± a) acidic b) basic c) neutral 7) CaCO 3 (s) + H 2 O ± a) acidic b) basic c) neutral 8) The interaction between the side chains of lysine and glutamic acid within a polypeptide chain is an example of: a) Hydrophobic interactions b) Electrostatic interactions c) Covalent bonding 9) How many separate amino acids make up the polypeptide sequence shown below? a) 2 b) 3 c) 4 + H 3 N O N H H N OH O OH O + H 3 N O...
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This note was uploaded on 02/28/2012 for the course CHEM 103 taught by Professor O'halloran during the Fall '08 term at Northwestern.

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Quiz 1 - 2(g ± a MgO 3(s C(s b MgO 2(s CO(g c Mg(s CO 3(g...

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