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- What is the density of glass in g/cm3 if a sample weighing 27.43 g has a volume of 12.40 cm3?
Problem 66
- What is the density of lead in g/cm3 if a sample weighing 206.77 g has a volume of 15.50 cm3?
Problem 67
- A vessel contains 4.67 L of bromine whose density is 3.10 g/cm3. What is the mass of the bromine in the vessel (in kilograms)?
Problem 68
- Gaseous hydrogen has a density of 0.0899 g/L at 0 °C, and gaseous chlorine has a density of 3.214 g/L at the same tem-perature. How many liters of each would you need if you wanted 1.0078 g of hydrogen and 35.45 g of chlorine?
Problem 70
- What is the density of lead in g/cm3 if a rectangular bar mea-suring 0.50 cm in height, 1.55 cm in width, and 25.00 cm in length has a mass of 220.9 g?
Problem 72
- What is the density of lithium metal in g/cm3 if a cylindrical wire with a diameter of 2.40 mm and a length of 15.0 cm has a mass of 0.3624 g?
Problem 73
- You would like to determine if a set of antique silverware is pure silver. The mass of a small fork was measured on a balance and found to be 80.56 g. The volume was found by dropping the fork into a graduated cylinder initially contain-ing 10.0 mL of water. The volume after the fork was added was 15.90 mL. Calculate the density of the fork. If the den-sity of pure silver at the same temperature is 10.5 g/cm3, is the fork pure silver?
Problem 74
- Label the following properties as intensive or extensive: den-sity, volume, mass, electrical conductivity.
Problem 75
- The density of chloroform, a widely used organic solvent, is 1.4832 g/mL at 20 °C. How many milliliters would you use if you wanted 112.5 g of chloroform?
Problem 76
- More sulfuric acid (density = 1.8302 g/cm3) is produced than any other chemical—approximately 3.6 * 1011 lb/yr world-wide. What is the volume of this amount in liters?
Problem 77
Problem 78
Which has more kinetic energy, a 1400 kg car moving at 115 km/h or a 12,000 kg truck moving at 38 km/h?
- Sodium (Na) metal undergoes a chemical reaction with chlorine (Cl) gas to yield sodium chloride, or common table salt. If 1.00 g of sodium reacts with 1.54 g of chlorine, 2.54 g of sodium chloride is formed and 17.9 kJ of heat is released, how much sodium and how much chlorine in grams would have to react to release 171 kcal of heat?
Problem 81
- A Big Mac hamburger from McDonald’s contains 540 Calories. (a) How many kilojoules does a Big Mac contain?
Problem 82
- A 20 fluid oz. soda contains 238 Calories. (a) How many kilojoules does the soda contain? (b) For how many hours could the amount of energy in the soda light a 75-watt light bulb? (1 watt = 1 J/s)
Problem 83
- Which of the following statements uses exact numbers? (a) 1 ft = 12 in. (b) 1 cal = 4.184 J (c) The height of Mt. Everest is 29,035 ft. (d) The world record for the 1-mile run, set by Morocco's Hicham el Guerrouj in July 1999, is 3 minutes, 43.13 seconds
Problem 84
- What is the difference in mass between a nickel that weighs 4.8 g and a nickel that weighs 4.8673 g?
Problem 85
Problem 86a
How many significant figures are in each of the following measurements? (a) 35.0445 g
Problem 86c
How many significant figures are in each of the following measurements? (c) 0.030 03 kg
Problem 86d
How many significant figures are in each of the following measurements? (d) 0.004 50 m
Problem 86e
How many significant figures are in each of the following measurements? (e) 67,000 m2
Problem 86f
How many significant figures are in each of the following measurements? (f) 3.8200⨉103 L
Problem 87b
How many significant figures are in each of the following measurements? (b) 2000.003 g
Problem 87c
How many significant figures are in each of the following measurements? (c) 5 ft 3 in.
Problem 87d
How many significant figures are in each of the following measurements? (d) 510 J
Problem 87e
How many significant figures are in each of the following measurements? (e) 5.10⨉102 J
Problem 87f
How many significant figures are in each of the following measurements? (f) 10 students
Problem 88a
The Vehicle Assembly Building at the John F. Kennedy Space Center in Cape Canaveral, Florida, is the largest building in the world, with a volume of 3,666,500 m3 (a) Round off this quantity to four significant figures and then to two significant figures.
Problem 88b
The Vehicle Assembly Building at the John F. Kennedy Space Center in Cape Canaveral, Florida, is the largest building in the world, with a volume of 3,666,500 m3 (b) Express the answers in scientific notation.
Problem 89a
The diameter of the Earth at the equator is 7926.381 mi. (a) Round off this quantity to four significant figures and then to two significant figures.
Problem 89b
The diameter of the Earth at the equator is 7926.381 mi. (b) Express the answers in scientific notation.