apchem chp4 suppws

apchem chp4 suppws - AP Chemistry Chapter 4: Chemical...

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AP Chemistry – Chapter 4: Chemical Equations and Stoichiometry Supplemental Worksheet Name: ____________________________________ Date: _________________ Period: _____ 1. Oil paintings in which “white lead” has been used can be blackened by reaction with H 2 S from air pollution or from the glaze over the painting itself. The blackening comes from the formation of lead sulfide, which may be cleaned off by washing with hydrogen peroxide, H 2 O 2 . The reaction for the cleaning process is PbS (black solid) + 4 H 2 O 2(aq) PbSO 4(s) + 4 H 2 O (l) a. How many grams of H 2 O 2 must be used to clean off 0.24 g of PbS? b. If 0.072 g of H 2 O form in the reaction, how many grams of PbSO 4 must also have been formed? 2. Methyl alcohol, CH 3 OH, is a clean-burning, easily handled fuel. It can be made by the direct reaction of CO and H 2 (obtained from coal and water). CO (g) + 2 H 2(g) CH 3 OH (l) Assume you start with 12.0g of H 2 and 74.5g of CO; a. Which of the reactants is in excess? b.
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This note was uploaded on 12/07/2011 for the course CHEM 100 taught by Professor Feebeck during the Fall '10 term at Purdue.

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apchem chp4 suppws - AP Chemistry Chapter 4: Chemical...

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