Chem 112 Exam AID Course Pack

Instead of using concentrations as before we will

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Unformatted text preview: to be invalid d) intelligent pink rabbits e) none of the above Solutions Questions Ethan Newton & Barry Zhang for SOS Winter 2012 31 Which of these melts at the lowest temperature? Diethyl ether, chlorohexane, acetone, ammonium sulfate What about the highest? Dimethylformamide (DMF) has the structural formula (CH3)2NCOH. Which of the following can form hydrogen bonds with DMF? H2O, CH2O, CH3CH2OH, CCl3CH2CH3, CaCl2 (There is more than one answer). Acetate ion forms dimers in water. If an aqueous solution of 0.1M sodium acetate is formed, what is the value of the electrolyte factor for the purposes of colligative property calculations? Which of these statements is false? a) ethylene diol (HOCH2CH2OH) is soluble in water b) a solution of chloroform (CHCl3) and acetone (CH3)2CO does not involve hydrogen bonds c) a solution of nitrogen dioxide (a reddish- brown gas) in carbon dioxide (a colourless gas) will have a homogenous brown appearance d) a solution of 0.3M sucrose in ethanol has a lower vapour pressure than a solution of 0.2M sucrose and 0.2M fructose in ethanol e) if you come across a container of fluorine gas in the lab, dropping a burning match into it is a bad idea Phase Transitions Questions Dr. Mombourquette has synthesized two compounds, both liquids; together, they form Mixture X, which is both a minimum- boiling and a maximum- boiling azeotrope (it has both a maximum and a minimum on a melting point fraction curve). If distillation is the only technique available to us, a) we can always purify this mixture b) we can purify it for some initial temperatures but not others c) we can purify it at some initial compositions but not others d) we can purify it if the liquids are both polar e) we can never purify this mixture Carbon in the solid phase exists as large networks of covalently linked carbon atoms, which can take on two distinct forms, graphite and diamond. (Applying very high pressure to graphite will produce diamond). We would expect the phase diagram for carbon to show a) that decreasing the pressure for liquid carbon will produce graphite b) that graphite melts between 50 and 100 °C c) no gaseous phase Ethan Newton & Barry Zhang for SOS Winter 2012 32 d) two triple points e) none of the above Lewis Structures Questions What is wrong with the structural formula CH3COHCOH2? SOCl2, thionyl chloride, is used in the production of organic chlorine- containing compounds. How many major resonance structures does it have? PRACTICE MULTIPLE CHOICE QUESTIONS 1. What is the change in internal energy of a system in which 25 kJ of work is done on the system...
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