Andor species e is not a catalyst because a catalyst

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Unformatted text preview: it an intermediate? Justify your answer. Species E is an intermediate; it is formed in step 1 and consumed in step 2. AND/OR Species E is not a catalyst because a catalyst occurs as a reactant in an earlier step and is then reproduced as a product in a later step. © 2008 The College Board. All rights reserved. Visit the College Board on the Web: www.collegeboard.com. One point is earned for the correct answer with justification. AP® CHEMISTRY 2008 SCORING GUIDELINES (Form B) Question 3 A 0.150 g sample of solid lead(II) nitrate is added to 125 mL of 0.100 M sodium iodide solution. Assume no change in volume of the solution. The chemical reaction that takes place is represented by the following equation. Pb(NO3)2(s) + 2 NaI(aq) → PbI2(s) + 2 NaNO3(aq) (a) List an appropriate observation that provides evidence of a chemical reaction between the two compounds. A precipitate forms with an appearance that is different from that of the dissolving solid. One point is earned for stating that a precipitate is...
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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.

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