Fall 07 Mid Term 1 MW

Fall 07 Mid Term 1 - Midterm I Chemistry 400 Form A Name Date Please use scantron to mark your answers for questions 1 through 13(4 points each and

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Midterm I Chemistry 400 Name ____________________________________________ Form A Date _____________________________________________ Please use scantron to mark your answers for questions 1 through 13 (4 points each) and show all your work for questions 14 through 21 (6 points each). 1. The mass of a sample is 560 milligrams. Which of the following expresses that mass in kilograms? A. 5.6 × 10 8 kg B. 5.6 × 10 5 kg C. 5.6 × 10 -4 kg D. 5.6 × 10 -6 kg E. 5.6 × 10 -1 kg 2. Which of the following statements shows the Law of Conservation of Mass? i) 5.585 g of iron reacts with 12.000 g of chlorine to make 16.220 g of product and 1.365 g of chlorine left over ii) 7.000 g of iron react with 10.635 g of chlorine to make 16.220g of product and 1.415g or iron left over. iii) 7.000 g of iron react with 10.635 g of chlorine to make 14.090g of product and 3.545g or iron left over. A. i. only B. ii. Only C. iii only D. all of the above E. none of the above 3. In the question above, which of the statements is required to prove the Law of Multiple proportions? A. i. only B. i. and ii. Only C. ii. and iii only D. all of the above are required E. none of the above 4. Calcium fluoride, CaF 2 , is a source of fluorine and is used to fluoridate drinking water. Calculate its molar mass A. 118.15 g/mol B. 99.15 g/mol C. 78.07 g/mol D. 59.08 g/mol E. 50.01 g/mol
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5. What is the mass in grams of 0.250 mol of the common antacid calcium carbonate? A. 4.00 × 10
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This note was uploaded on 02/12/2008 for the course CHEM 400 taught by Professor Gupta during the Fall '07 term at American River.

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Fall 07 Mid Term 1 - Midterm I Chemistry 400 Form A Name Date Please use scantron to mark your answers for questions 1 through 13(4 points each and

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