103EX2-practice_ans

103EX2-practice_ans - THE CITY COLLEGE Department of...

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THE CITY COLLEGE Department of Chemistry Chemistry 103 ANSWERS TO PRACTICE EXAMINATION II Work problems out to the correct number of significant figures! 1. (8 pts) a) In the SI system , the derived units for pressure in Pascals are kg/m . s 2 . b) Charles law is the relationship between Volume and Temperature . c) HCl is classified as a strong electrolyte while acetic acid, CH 3 COOH, is a weak electrolyte. d) The van der Waals Equation has two constants which correct the Ideal Gas Law for the finite gas volume and the intermolecular forces of the gas molecules e) A chemical reaction which releases heat to the surroundings in called an exothermic reaction. 2. (12 pts) Complete and balance the following chemical equations: a) The net molecular reaction of Hg 2 (NO 3 ) 2 (aq) + 2 NaBr (aq) Hg 2 Br 2 (s) + 2 NaBr (aq) b) The net ionic reaction in a) Hg 2 ++ (aq) + 2Br - (aq) Hg 2 Br 2 (s) c) Fe (s) + 4 HNO 3 (aq) Fe (NO 3 ) 3 + NO + 2 H 2 O ______________ d What is the oxidation state of N in HNO 3 +5 ? 3. ( 12 pts) A 0.3460 g sample of water containing MgBr 2 is treated with excess AgNO 3 which produces a precipitate of AgBr. After drying and weighing to constant weight , the AgBr
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precipitate was found to be 0.02763 g . What is the % of MgBr
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This test prep was uploaded on 04/11/2008 for the course CHEM 103 taught by Professor Forgot during the Spring '07 term at CUNY City.

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103EX2-practice_ans - THE CITY COLLEGE Department of...

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