Name___________________________________Preliminary Topics
DIRECTIONS: Circle the answer that best completes each statement.
1. 1000. (a) contains four significant figures. (b) is the number of grams in a kilogram. (c) = 1.000 X 10 4. (d) is the product of (2.000 X 10-4)(5.000 X 107). a,b,&d a&b b,c,&d b&c 2. 2.0 X 10-3 (a) contains one significant figure. (b) is the number of L in 2.0 ml. (c) = 0.0020. (d) is the product of 2.0(1.0 X 10-3). a,b,&c a,c,&d b,c,&d a&c 3. A solution of 2.5 g of table sugar dissolved in 5.0 ml of water contains a sugar concentration of (a) 0.50 mg/ml. (b) 0.50 g/ml. (c) 5.0 X 102 mg/cm3. (d) 5.0 X 102 g/L. a&b b&c a,b,&d b,c,&d Use the following table to answer Questions 4 & 5. Density of various common substances at 20oC. Substance Density (g/cm3) Water 1.00 Magnesium 1.74 Aluminum 2.70 Lead 11.34 Mercury 13.6 4. At 20oC (a) 1.0 ml of magnesium has a greater mass than 1.0 ml of aluminum. (b) 13.6 ml of water has a greater mass than 1.0 ml of lead. (c) 0.1 ml of lead has a greater mass than 1.0 ml of water. (d) 10 ml of magnesium has a greater mass than 1.0 ml of mercury. a&b a,b,&d b,c,&d all of the above 5. At 20oC (a) 1 g of lead has a greater volume than 1 g of mercury. (b) 1 g of water has a greater volume than 1 g of air. (c) 1 L of air has a greater volume than 1 L of water. (d) 100 g of magnesium has a greater volume than 100 g of water. a only a&c b&d c only 6. Which of the following are pure substances? (a) wine (b) water (c) blood (d) iron b&d b only b,c,&d all of the above 7. Which of the following are elements? (a) water (b) sugar (c) table salt (NaCl) (d) the atmosphere a&d b&d b only none of the above 8. Which of the following are heterogeneous? (a) gold (b) gasoline (c) a solution of ethanol and water (d) water a&c b&c a,b,&d none of the above 9. 0 K is (a) the freezing point of water. (b) -273oC. (c) zero Kelvins. (d) -180oC. c only a&c c&d a,b,&c 10. Which of the following statements are false? (a) Grams are a measure of mass. (b) Millimeters are a measure of volume. (c) Cubic centimeters are a measure of density. (d) (85 - 84)oF = (85 - 84)oC all of the b only b,c,&d b&c above 11. Which of the following numbers have three significant figures? (a) 1,050 (b) 1,150 (c) 0.005 (d) 1,050,100 all of the b&d a,b&d a&b above 12. Which of the following are physical properties? (a) combustibility (b) heat conductivity (c) length (d) brittleness all of the b,c&d b&d a,b&d above 13. Which of the following are chemical changes? (a) milk souring (b) silver tarnishing (c) butter melting (d) coal burning a,b&d all of the b,c&d a&b above 14. Which of the following are exact numbers? (a) There are 12 eggs in a dozen. (b) The boiling point of methylene chloride is 42oC. (c) Neil Armstrong was on the moon for 2 hours, 31 minutes. (d) Pikes Peak in Colorado is 14,110 ft above sea level. a&b a&c all of the a only above 15. Which of the following represents the greatest percent uncertainty? (a) A thermometer reading of 100oC + 3oC. (b) The specific heat of Cd is measured to be 0.197 J/g.Co (the theoretical value is 0.231 J/g.Co). (c) The melting point of tin is measured to be 244oC (the theoretical value is 232oC). (d) A balance measured the mass of a 1.000 g standard as 0.9981 g. a b c d 16. Which quantity in Question 15 represents the least percent uncertainty? a b c d 17. The answers to which of the following will have three significant figures? (a) (6.022 X 1023) (2.61 X 108) (b) 6.314 X 10-4 + 6.94 X 10-1 + 2.6501 X 103 (c) (9.42 X 102 + 1.62 X 104) / 4.1 (d) 485 / 9.231 a&b c&d a,b&d a&d 18. Which of the following hypotheses could be tested? (a) Bill Russell was a better basketball player than Magic Johnson. (b) I can read your mind. (c) In the year 2020, there will be 14 billion people living on earth. (d) Eating carrots prevents colon cancer. a,c&d a&d b,c&d c&d 19. Which of the following statements are true? (a) 301 m < 0.300 km (b) 29.56 g < 29,56 kg (c) 3.54 g/L < 3.54 g/cm3 (d) 525 mm < 5.25 X 10-3 km a&b b&d b,c&d a,c&d 20. Which of the following are units of volume? (a) kJ (b) m3 (c) atm (d) ml c&d b&d a,b&d b&c