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1021JDBMidtermExamI(Chapters 1, 2, 3 and 4.7) (9th Edition) Fall 2009VersionB(AnswerKey)

1021JDBMidtermExamI(Chapters 1, 2, 3 and 4.7) (9th Edition) Fall 2009VersionB(AnswerKey)

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Dr. Jim Bloxton NAME CHEM 1021 Fall 2009 Lecture Midterm I (Chapters 1, 2, 3, 4.7) 9 th Edition Answer Key Please put your name, recitation day and time at the top of this exam. All work for all problems must be shown. Include proper units for each calculation. 1. Is the formation of carbon dioxide gas bubbles from the mixing of sodium bicarbonate and hydrochloric acid an example a chemical change? Explain. This is a chemical change since a new substance has been formed. 2. Express the following answer in standard scientific notation using significant figures. 1287.435 g + 319.21 g 1.60666 x 10 3 g 3. How many feet are there in 416. mm? 1 inch = 2.54 cm. Show all calculations. 416 mm x 1 m x 100 cm x 1 in x 1 ft -------------------------------------------------------------------------- = 1.36 ft 1000 mm x 1 m x 2.54 cm x 12 in 4. A urinometer when placed in 0.3105 kg of a liquid at 30 o C gave a reading of 1.005. The density of water at 30 o C is 0.9956 g/mL. What is the volume in mL of this liquid? Show all calculations and use significant figures. 0.3105 kg x 1000 g ---------------------------- = 310.5 g 1 kg Density of substance = specific gravity of substance x density of water Density of substance = 1.005 x 0.9956 g/mL

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1021JDBMidtermExamI(Chapters 1, 2, 3 and 4.7) (9th Edition) Fall 2009VersionB(AnswerKey)

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