chem 141 F07 exam II-Answers

chem 141 F07 exam II-Answers - General Chemistry 141 Exam...

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General Chemistry 141 Exam II October 17, 2007 Instructions Turn your cell phone OFF. Vibrate is NOT acceptable. The only acceptable setting is OFF. To do otherwise is to compromise the concentration of you and your peers. Show all work for problem-solving questions. If you make any mathematical assumptions, be sure to verify them clearly. Follow correct significant figure conventions. “By signing below, I acknowledge that I have read the instructions above and pledge that I will take this exam under all standards and principles set by the Emory University Honor Council.” SIGNATURE: ______________________ KEY _______________________________ Printed Name: __________________________ Student ID:__________________ Section # __________________ Scantron total ________ Problem total _________ Overall ___________ 1
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I Matching For each of the following questions chose the letter on the right that best matches the question on the left and mark you answer on the bubble sheet . You MUST use a #2 pencil and fill in the sheet properly or your answers will not be recorded and you will receive a zero. (2 points each) 1. __L___ base a. forms H + (H 3 O + ) ions in water 2. __B___ diffusion b. Movement of one gas through another 3. __M___ oxidation c. P 1/V 4. __K___ Charles’ Law d. 20 ºC, 1 atm 5. __E_ Amontons Law e. P T 6. __F___ effusion f. Escape of gas particles through a small hole 7. __J___ STP g. involves a gain of electrons h. species which causes oxidation i. V n j. 273 L, 760 torr k. T V l. accepts a proton (H + ) during a chemical reaction. m. involves an increase in oxidation number II Multiple Choice Chose the most correct answer for each of the following and note the question numbers. Mark you answer on the bubble sheet! (4 points each) 8. 100 mL of water at 25ºC and 100 mL of alcohol at 25ºC are both heated on identical hotplates under identical conditions. After 3 minutes the temperature of the alcohol is 50ºC. 2 minutes later the temperature of the water reaches 50ºC. Which liquid received more heat as it warmed to 50ºC? a. The water. b. The alcohol. c. Both received the same amount of heat. d. It is impossible to tell from the information given. 2
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9. For which one of the following reactions will Δ H be approximately (or exactly) equal to Δ E ? (chose the best answer) a. H 2 ( g ) + Br 2 ( g ) 2HBr( g ) b. H 2 O( l ) H 2 O( g ) c. CaCO 3 ( s ) CaO( s ) + CO 2 ( g ) d. 2H 2 ( g ) + O( g ) 2 H 2 O( l ) e. CH 4 ( g ) + 2O 2 ( g ) CO 2 ( g ) + 2H 2 O( l ) 10. The diagram represents a mixture of S atoms and O 2 molecules in a closed container. Key O 2 molecule S atom Which diagram shows the results after the mixture reacts as completely as possible according to the equation: 2S + 3O 2 Æ 2SO 3 (A) (B) (C) (D) (E) 11. A mine shaft filled with air at 1.00 atm and 20 ºC is sealed to prevent the spread of a coal fire which will soon reach the bottom of the shaft. If the fire is expected to heat the air inside the shaft to 120 ºC, what will be the pressure inside the shaft, assuming
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This note was uploaded on 11/03/2008 for the course CHEM 141 taught by Professor Mulfod during the Fall '08 term at Emory.

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chem 141 F07 exam II-Answers - General Chemistry 141 Exam...

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