FALL2006 Exam 1

FALL2006 Exam 1 - CHEM 109 EXAM 1 FALL 2006 SHOW ALL WORK...

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CHEM 109 EXAM 1 FALL 2006 – SHOW ALL WORK – NO WORK – NO CREDIT 1. (10 pts) During the first lecture in Chemistry 109, you observed a violent reaction take place when a 4.20 gram red gummi bear was placed into some melted potassium chlorate. The gummi bear, made of sucrose (C 6 H 12 O 6 ), flavoring, and red dye, has a volume of 2.5 mL. In (a) and (b) below, circle the one correct answer in each. (a) The gummi bear is a(n): element compound mixture (b) An intensive property of a red gummi bear is: 4.20 grams red color 2.5 mL volume (c) Very briefly describe a PHYSICAL CHANGE that could happen to a gummi bear: (d) Of the following which is NOT true? (i) The total volume of ten gummi bears would be 0.025 L (ii) According to this data, a gummi bear would sink if placed in water (density H 2 O = 1.00 g/mL) (iii) All of the atoms in sucrose are non-metals (iv) Potassium chlorate melts at 356 o C, this is 583 o F 2. (10 pts) (a) Tennis players often argue about the “close calls” of line judges. This year, the US Open Tennis Championships allowed a new video system to review how close a ball comes to a line. The image can pinpoint the ball within a 3.0 millimeter spot. Report this value in meters and nanometers. __________ meters __________ nanometers (b) A US penny is made of zinc and copper. The density of copper is 8.96 g/cm 3 . The density of zinc is 7.14 g/cm 3 . The shaded box shown below represents a piece of copper. Of the shapes labeled (i) , (ii) , and (iii) , which would best represent a piece of zinc with the same mass as the copper shape? (circle your choice) (c) Two students each massed a U.S. penny. What is the difference in the mass of these two pennies? Penny #1 mass = 3.1200 grams Penny #2 mass = 2.5 grams __________ grams 1 (i) copper density = 8.96 g/cm 3 (ii) (iii)
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CHEM 109 EXAM 1 FALL 2006 – SHOW ALL WORK – NO WORK – NO CREDIT 3. (15 pts) Epinephrine, C 9 H 13 NO 3 , a hormone produced by the adrenal gland, increases heart rate and blood pressure by constricting blood vessels. The “adrenaline rush” experienced by athletes, people who are excited, and those in danger is produced by the release of epinephrine. (a) What is the mass, in amu, of one molecule of epinephrine? amu
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This test prep was uploaded on 04/12/2008 for the course CHEM 109 taught by Professor Malina during the Spring '08 term at UNL.

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FALL2006 Exam 1 - CHEM 109 EXAM 1 FALL 2006 SHOW ALL WORK...

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