CHEM 6A Final Winter

CHEM 6A Final Winter - CHEM 6A Final...

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Unformatted text preview: CHEM 6A Final Name___________________ Hand-in the scantron and keep the exam. TAs Name_______________ Use pencil only, completely fill in the ovals, fill in your perm number on the scantron, and write your TAs name on the scantron.(10pts) The integrations are under each signal in the 1H NMR. 1) Place the following three solvents (diethyl ether, methylene chloride, water) in order of decreasing density. a. Methylene chloride, water, diethyl ether b. Water, methylene chloride, diethyl ether c. Diethyl ether, methylene chloride, water d. Water, diethyl ether, methylene chloride 2) The melting points of compounds A and B are 61 and 74 degrees Celsius. Which of the following mixtures could be the eutectic point? a. 10% A, 90% B mp=35-45 b. 15% A, 85% B mp=76-77 c. 37% A, 63% B mp=40-50 d. 20% A, 80% B mp=51-53 3) Light shines through a compound at 3.42 X 10 9 m/s to give a refractive index of 1.14. What is the speed of light through a vacuum? a. 2.1 x 10 8 m/s b. 2.14 x 10 9 m/s c. 3.0 x 10 8 m/s d. 4.2 x 10 7 m/s e. 4.2 x 10 8 m/s 4) Which one of the following statements is true regarding the distillation of a solution of ethanol and water? a. the boiling point is dependant upon the concentration of ethanol and water b. the boiling point is dependant upon the applied pressure c. the boiling point is dependant upon the partial pressures d. a-c are correct 5) What is brine? a. solution of sodium bicarbonate b. solution of sodium chloride c. solution of sodium sulfate d. solution of potassium carbonate 6) What is the active ingredient in a vodka tonic?(biological activity induces intoxication) a. Methanol b. ethanol c. Isopropanol d. Tonic water 7) What is the standard density that all other densities are compared? a. Air b. Water c. Carbon d. Benzoic acid 8) The pressure above a solution of liquid X and liquid Y in a sealed bottle is 28 torr. The partial pressure of liquid X is 12 torr, the molar fraction of X is 0.2. What is the pressure of liquid Y at standard temperature and pressure? a. 2.4 torr b. 20 torr c. 22 torr d. 7000 torr 9) An aqueous solution is 0.04wt% cinnamic acid(mw=148.16g/mol). What is the molarity of cinnamic acid in the solution? The density of the solution is 1g/ml. a. 0.05M b. 0.25M c. 0.27M d. 0.285M e. 3M 10) What forms when sodium sulfate is added to small amount of water? a. sodium hydride and sulfuric acid b. sodium hydroxide and sulfuric acid c. hydrate d. urea e. The sodium sulfate evaporates 11) Which of the following solutions will aid in solubilizing the following compound in an aqueous layer? O OH a. 3M HCl b. 3M NaOH c. brine d. sodium sulfate e. water 12) Which of the following solutions will aid in solubilizing the following compound in an aqueous layer?...
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This note was uploaded on 04/08/2008 for the course CHEM 6a taught by Professor Pettus during the Winter '07 term at UCSB.

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CHEM 6A Final Winter - CHEM 6A Final...

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