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Unformatted text preview: reserved. Visit the College Board on the Web: www.collegeboard.com. AP® CHEMISTRY 2008 SCORING GUIDELINES (Form B)
Question 5 (continued)
(d) When the unknown compound is carefully heated, it loses mass. In the table below, cross out each compound that can be eliminated using this test. Al(NO3)3. 9H2O NaCl BaCl2. 2H2O BaSO4 CaCO3 Ni(NO3)2. 6H2O CuSO4. 5H2O One point is earned for crossing out NaCl or for crossing out either CaCO3 or BaSO4 if they had not been crossed out earlier. (e) Describe a test that can be used to confirm the identity of the unknown compound identified in part (d). Limit your confirmation test to a reaction between an aqueous solution of the unknown compound and an aqueous solution of one of the other soluble salts listed in the tables above. Describe the expected results of the test; include the formula(s) of any product(s). One point is earned for describing a precipitation reaction between the compound left in part (d) and another compound given in the problem....
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This note was uploaded on 05/05/2011 for the course CHEM 504 taught by Professor John during the Fall '11 term at American College of Computer & Information Sciences.
- Fall '11