practiceexam7 - City College, Chemistry Department...

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City College, Chemistry Department Chemistry 10301, sections L and L2, Prof. T. Lazaridis Second Midterm exam, Nov. 6, 2001 Name (last name first): ___________________________________ I.D. Number: ____________________________________________ Workshop leader: ________________________________________ Note: There are 7 questions in this exam (check both sides of the sheet). Fill in your answer in the blank space provided immediately following each question. One point will be subtracted every time you report a numerical result with an incorrect number of significant figures. The last sheet of this exam contains information that may or may not be needed to answer these questions. Useful data: R=0.0821 atm L/mol K = 8.3145 J/mol K 1. (20) a. (5) What will we obtain by adding CaCO 3 to water? (Use information provide on your data sheet) Solution Heterogeneous Mixture (CaCO 3 is insoluble) b. (5) A chemical analysis reports that a sample of water contains 8 ppm of lead. How many grams of lead are in one liter of this water ? (Density of water: 1g/ml) 8 ppm = x g lead / (1000 ml * 1 g/ml) => x = 0.008 g Pb
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This note was uploaded on 07/21/2011 for the course CHEM 111 taught by Professor Sawyers during the Spring '11 term at Virginia College.

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practiceexam7 - City College, Chemistry Department...

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