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NAME _________________________ WORKSHEET 1 Show all your work clearly. Neatness counts. Points will be deducted if your work is not neat. You may collaborate to complete this assignment, but you are required to turn in our own work. 1. There are 4 significant figures in 0.02102cm with the estimation in last 2, and it means anywhere between 0.02101cm to 0.02103cm. Answer the following using this example. a) There are _______ significant figures in 12.50g with the estimation in ________ , and it means anywhere between ________________________. b) There are ________ significant figures in 100 g with the estimation in ________ , and it means anywhere between ________________________. c) There are ________ significant figures in 100. g with the estimation in ________ , and it means anywhere between ________________________. 2. An oxygen atom is connected to two H atoms in water. The distance between O and H is 95.8 pm. What is this distance in nanometers? In inches? 3. Oceanographers often express the density of seawater in units of kilograms per cubic meter. If the density of sea water is 1.025 g/cm3 at 15oC, what is the density in kilograms per cubic meter? 1 NAME _________________________ WORKSHEET 1 4. The density of iron is 7.878 g/cm3.What is the mass of iron in kilograms, in a slab that is 4.5m long, 1.5m wide, and 25 cm thick? Express this answer also in units of pound. 5. Copper has a density of 8.94 g/cm3. If a factory has a chunk of copper that has a mass of 125 lb and is drawn into a wire with a diameter of 9.50 mm, what is the length of the wire in meters? Assume that the shape of the wire is a cylinder. Hint: Look up the equation for the volume of a cyclinder 2 NAME _________________________ WORKSHEET 1 6. Gold has a density of 19.31 g cm-3. How many grams of gold are required to provide a gold coating 0.500mm thick on a ball bearing having a diameter of 2.00 mm? Hint: Look up the equation for the volume of a sphere 7. Car batteries are filled with concentrated sulfuric acid. What is the mass of the acid (in grams) in 500 mL of the battery acid solution, if the density of it is 1.285 g/cm3 and if the solution is 38.0 % sulfuric acid by mass? 3 NAME _________________________ WORKSHEET 1 8. The aluminum in a package containing 75 ft 2 of kitchen foil weighs approximately 12 oz. Aluminum has a density of 2.70 g/cm3. What is the approximate thickness of the aluminum foil in millimeters. 1 oz = 28.4 g 9. There exists a single temperature at which the value reported in oF is numerically the same as the value reported in oC. What is this temperature? 4