Test 2 Chemistry 10 Dr Kline January 19 2011 first letter of last name Name This test consists of a combination of multiple choice and other questions There should be a total of 12 questions on three pages please check to make sure that they are all here Do not use your own tables scratch paper or other information Please turn off all cell phones pagers and other communication devices they will be confiscated if they make noise No food No water No gum No bathroom breaks No scratch paper A regular calculator is OK but you may not use graphing or programmable calculators and they will be confiscated if they are discovered during the test The test will end 90 minutes after it starts The info sheet is on a sheet separate from the rest of the test please check out the information on said sheet before asking questions about missing information in the body of the test Multiple Choice Questions These eight questions are worth four points each for a total of 32 points Unless it is stated otherwise in a given problem there is only one correct answer for each question Answer each question by circling all letter s corresponding to the correct choice s If more than one answer is correct you should circle all of the correct ones It is not necessary to show work for these questions however you may write on the exam 1 In which of the following is the chemical substance correctly labeled with the basic units of which it exists More than one may be correct a Aluminum chloride molecules b Helium single atoms c Ammonium chloride formula units ionic compound d Phosphorus trichloride molecules e None of the above 2 Which of the following compounds has the highest mass percent composition of oxygen a C2H2O2 b C6H4O2 c TiO2 3 What is the mass of one formula unit of lithium phosphide to within 0 2 amu a 37 9 amu b 51 8 amu c 99 8 amu d 85 9 amu e 44 9 amu e None of the above 4 Which of the following metal samples each in the shape of a cube and having a volume of 100 mL contains the most atoms a Lead d 11 4 g mL b Gold d 19 3 g mL c Copper d 8 96 g mL d Titanium d 4 50 g mL 5 For which of the following is are the molecular and the empirical formula the same More than one answer may be correct a Sulfur dioxide b Sodium peroxide c Lead IV oxide d Ammonium nitrate e None of them Page 1 of 4 Test 2A Chem 10 Winter 2011 6 How many carbon atoms are present in one mole of ethanol C2H6O a Two b 6 02 x 1023 c 1 20 x 1024 d 3 32 x 10 24 e 1 66 x 10 24 7 Which of the following contains the fewest atoms a 5 0 g He b 20 g Ne c 35 g Ar d 42 g Kr e 130 g Xe 8 Which of the following has the same percent composition by mass as cyclobutane C4H8 More than one may a Propene C3H6 b Ethane C2H6 c Tetrahydrofuran C4H8O d Butane C4H10 e None of them Other Questions Each of the following questions is worth the indicated number of points for a total of 68 points Please be sure to provide all of the information requested for each question Show work with units for all calculations 9 30 points Provide the name for each of the following chemical formulas and the chemical formula for each of the names Spelling counts Formula Name Br3S8 Cu2SO3 H2C2O4 aq K2O2 NO2 H2Se aq Mercury I phosphate Strontium dichromate Gold III hydroxide Tin II bicarbonate Page 2 of 4 Test 2A Chem 10 Winter 2011 10 10 points Balance the following equations State labels have been deliberately left out for simplification a As Cl2 b MgS HCl MgCl2 c C2H6 O2 CO2 d CaS CaSO4 AsCl3 CaO H2S H2O SO2 11 14 points The price of copper metal as of Monday was 4 3517 pound What is the cost of one atom of copper in pesos One Mexican peso 0 0833 also as of Monday Give your final answer to three significant digits 12 14 points The main active psychotropic molecule in Salvia divinorum is called Salinorin A It has a molecular mass of 432 4 g mole and its mass percent composition is 63 88 carbon 6 52 hydrogen and 29 60 oxygen Determine its molecular formula Hint it contains an even number of oxygen atoms Please circle or put a box around your final answer molecular formula You may use the back of this page Page 3 of 4 Test 2A Chem 10 Winter 2011 Chem 10 Test 2 Information Conversions assume all conversions within a given unit system are exact quantities 1 kg 2 2045 pounds lbs 1 mL 1 cm3 1 amu 1 66 x 10 24 g 1 L 1 0567 quarts qt K C 273 1 cal 4 184 joule Equations d m V q m x c x T Constants Avagadro s number 6 02 x 1023 Page 4 of 4 Test 2A Chem 10 Winter 2011
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