1 .		Which one of the following objects is the most dense? Online Text [Hint]
2 .		Perform the indicated operations and express the answer with the proper number of significant digits. 28.1 cm + 0.53 cm + 75.321 cm = Online Text [Hint]
3 .		Which one of the following numbers is incorrectly rounded off to three significant figures? Online Text [Hint]
4 .		The distance from Earth to the Moon is approximately 240,000 miles. The Concorde SST has an airspeed of about 2400 km/hr. If the Concorde could fly to the Moon, how many hours would it take, ignoring gravity? Online Text [Hint]
5 .		How many dozens of particles of dust are in 2.45 grams if each dust particle has a mass of 2.51 x 10-4 grams? Online Text [Hint]
6 .		Zinc has a density of 446 lb/ft3. What is the density of zinc in g/cm3? Online Text [Hint]
7 .		Perform the indicated operations, expressing the answer to the proper number of significant figures. 13.236 L + 6.2 L - 5.28 L = Online Text [Hint]
8 .		A spherical ball of lead has a diameter of 5.0 cm. What is the mass in grams of the sphere if lead has a density of 11.34 g/cm3? (The volume of a sphere is V = (4/3) r3.) Online Text [Hint]
9 .		If there are six iggs per ogg and three oggs per id, how many iggs are in four ids? Online Text [Hint]
10 .		Which number of significant figures is incorrect? Online Text [Hint]
11 .		The average distance from the Earth to the Moon, 383,000,000 m, can also be expressed as Online Text [Hint]
12 .		A student performs an experiment to determine the freezing point of water. Three values are obtained: -2.0°C, -2.2°C, and -2.1°C. The thermometer has a mark for each degree. Which of the following statements is true? Online Text [Hint]
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