General Organic And Biological Chemistry FINAL Exam Dr. Hart

Which is not an example of a pure substance? A. Sugar B. Air C. Aluminum foil D. Water E. A block of dry ice - ANS-Air Which one of the following substances is a pure substance? A. ranch dressing B. table salt C. soda pop D. tap water E. None are pure substances - ANS-Table salt Which one of the following is an example of a chemical change? A. boiling water B. frying chicken C. paint drying D. cutting your hair E. none are chemical changes - ANS-Frying Chicken Which is an example of a physical change? A. The rusting of an iron nail B. The burning of propane in a gas grill C. Baking cookies D. Polishing tarnished silver E. Melting of an ice cube in a glass of soda - ANS-Melting of an ice cube in a glass of soda Which measurement has the fewest number of significant figures? A. 12.80 m B. 0.1280 m C. 0. m D. 1280 m E. All of the measurements have the same number of significant figures. - ANS-D. 1280 When 4.870 x 10-3 is correctly converted to its standard form the number becomes A. 4870 B. 4870. C. 0.00487 D. 0. E. 0. - ANS-D. 0. Continues...