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Unformatted text preview: roduced during 1994? (b) The density of NaOH is 2.130 g/cm3. How many cubic meters of NaOH were produced? 38. Mercury is traded by the “flask”, a unit that has a measure of 34.5 kg. What is the volume of a “flask” of mercury in liters at 25oC. 39. 39. A 26.27 g sample of a solid is placed in a flask. Toluene, in which the solid is insoluble, is added to the flask so that the total volume of the solid together is 50.00 mL. The solid and toluene together have a mass of 52.65 g. The density of the toluene at the experimental temperature is 0.864 g/mL. What is the density of the solid? 40. Suppose you define your own temperature scale (G) using the freezing point (‐115 oC) and the boiling point (197.6 oC) of ethylene glycol (the main ingredient in automotive antifreeze). You set the freezing point of ethylene glycol as OoG and the boiling point as 100oG. On the G temperature scale, what is the temperature for the freezing point of water? 41. The world record for the marathon is 2 hours 4 minutes and 26 seconds (Haile Gebrselassie, Berlin Marathon, September 2003), The race length is 26 miles and 385 yards. That was Gebrselassie’s average speed during the race in km/hr? 42. The annual global increase in carbon dioxide, the major green house gas, are 5.5 gigatons from fossil‐fuels, 6.5 gigatons from industrial activity and 1.6 gigatons from deforestation. What is the total annual increase in CO2 in kg. (NOTE 1 metric ton is 1000kg) 43. The U.s. quarter has a mass of 5.67 g and is 1.55 mm thick. (a) How many quarters would have to be stacked to reach 575 ft, the height of the Washington Monument? (b) What would be the mass of this stack? (c) What would be the dollar value of the stack? (d) As of January 2008, the 44. 45. 46.
52. 53. 54. 55. 56. national debt was 9.3 trillion dollars. How many of these stacks would be needed to pay of the national debt? A 15.0‐cm long cylindrical glass tube, sealed at one end, is filled with ethanol. The mass of ethanol needed to fill the tube is 9.64 g. The density of ethanol is 0.789 g/mL. Calculate the inner diameter of the tube in centimeters. Gold is an alloy (mixed) with other metals to increase its hardness from jewelry making. Consider a piece of gold jewelry that has a mass of 9.85 g and a volume of 0.675 cm3. The piece contains only gold and silver. Assuming the total volume of the jewelry piece is the sum of the volumes of the gold and silver it contains, calculate the percentage of gold (by mass) in the piece. How many liters of water are in the Pacific Ocean if it has a water volume of 139 million cubic miles? What are the six most abundant elements in the human body by mass? A student finds that 15.20 g of nitrogen will react with 17.37 g, 34.74 g or 43.43 g of oxygen to form three different compounds. What are the empirical formulas of these three compounds? (hint‐convert mass to moles) Account for the fact that alpha ( particles and beta (β) particles are deflected in opposite directions by an electrical field. How many chromium atoms, if lined up, wo...
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- Fall '13
- AP Chemistry