CH 10102 Exam 1 F06 KEY - Chemistry 101-02 Fall 2006 Exam...

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C C h h e e m m i i s s t t r r y y 1 1 0 0 1 1 - - 0 0 2 2 Fall 2006 Exam One Circle the correct answers on this exam and fill in the appropriate bubbles on the answer sheet using a # 2 pencil. Turn in the answer sheet, but keep this exam for future reference, a key will be posted on the WebCT site. Be certain that, on the answer sheet, you enter your last name, first name, student ID number. Your grade will be posted on the WebCT site.
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CH 101-02 Exam 1,Fall 2006 2 Multiple Choice Problems: Choose the one alternative that best completes the statement or answers the question. (36 questions 3 points each). This exam has 108 points. Your score is the number of correct answers x 3. 1. What type of mixture would you make by combining 500 g ground beef, 250 g kidney beans, 5.0 mL Tabasco Sauce, 1.0 g sea salt, and 2.5 g beach sand? a) a heterogeneous mixture c) a homogeneous mixture b) Florida-style chili d) a solution 2. Which one of the best describes table sugar, sucrose (C 12 H 12 O 11 )? a) a heterogeneous mixture b) an elemental molecule c) a pure substance d) an ionic compound 3. Which one of the following is a chemical change? a) Sucrose is stirred into 100 g beach sand b) Sucrose is stirred into 100 g warm water c) Sucrose is sprinkled on top of your breakfast cereal d) Sucrose is digested by your stomach acids 4. Which one of the following is a physical change? a) Water becomes ice as it is cooled from 373 K to 173 K b) An atom of 238 U decays to 206 Pb c) A bicycle frame rusts when left out in the rain d) An incrimitating photograph is burned in the fireplace 5. What element is represented by the symbol Sn ? a) antimony c) tin b) arsenic d) selenium
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CH 101-02 Exam 1,Fall 2006 3 6. Which of the following are allotropes? a) O 2 and O 3 c) brass and bronze b) He and Ne d) Al and La 7. What is the chemical symbol for iron ? a) I c) Fe b) Ir d) Pb 8. Which of the following measurements might best describe the total passing distance of football quarterback Ron Whitcomb during the University of Maine Black Bears’ unfortunate 20-17 defeat of the College of William & Mary Tribe? a) 89.6 X 10 –2 µ m c) 89.6 m b) 89,611 km d) 896 mL 9. What is the chemical symbol for sodium ? a) Na c) K b) S d) Sb 10. Toby the lab technician takes three measurements of the mass of a tree bark sample. If the actual mass is 9.23 g, which set of measurements is precise but not accurate? a) 9.28 g, 8.21 g, 9.53 g c) 8.47 g, 8.45 g, 8.44 g b) 9.20 g, 9.55 g, 8.94 g d) 10.0 g, 9.23 g, 9.23 g 11. If a 36.0 g sample of peanut butter is burned in a calorimeter that contains 100. g water and the temperature of the water increases from 20.0 ºC to 22.5 ºC, how much heat energy is released? (Note: 1 calorie = 4.18 joules) a) 167.2 J c) 209 J b) 1.05 kJ d) 5.098 X 10 2 J 12. The density of Gallium is 5904 kg/m 3 , what is the density of Ga in g/mL?
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CH 101-02 Exam 1,Fall 2006 4 a) 5.904 X 10 –6 g/mL c) 5904 g/mL b) 5.904 X 10 4 g/mL d) 5.904 g/mL 13. The melting point of Gallium is of 85.66 ºF or 303 K. Determine this temperature in degrees Celsius.
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This note was uploaded on 05/17/2008 for the course CH 101 taught by Professor Setzer during the Spring '08 term at University of Alabama in Huntsville.

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CH 10102 Exam 1 F06 KEY - Chemistry 101-02 Fall 2006 Exam...

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