The densities of the coinage metals (copper, silver and gold) are as follows: copper = 8.95 g/cm3 silver = 12.59 g/cm3 gold = 19.32 g/cm3 A sample of material is found to weigh 14.03 grams, and have a volume of 1.20 cm3. The sample could be which of the coinage metals?
A) copper
B) silver
C) gold
B
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The U.S. Census Bureau offers KML files of nation-based and state-based boundaries for download. What is the main application of these files?
What will be an ideal response?
Cap and Trade is a system that ________
A) allows industries to set their own levels for pollution emission so trading can continue B) rapidly brings pollution emissions to near zero for participating industries C) permits industries that pollute under the federal cap to sell credits to industries that pollute over the cap D) specifies a certain cap on industrial pollutants that can be traded to other nations E) has been repealed by Congress as useless in diminishing pollution
One problem that occurs as a consequence of CFC pollution is ________
A) eutrophication B) damage to human red blood cells C) movement of toxins into lakes and rivers, which poisons fish D) increasing skin cancer in humans E) respiratory irritation and lung cancer
Unbranched hydrocarbons are also called straight chain hydrocarbons. Which of the following is true of unbranched hydrocarbons?
A) Each carbon has bond angles of 120°. B) Every carbon atom is connected to two other carbon atoms. C) both a and b D) neither a nor b