177Exam1KeySS07

177Exam1KeySS07 - Prof. Joe Burnett Summer 2007 This exam...

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Prof. Joe Burnett Summer 2007 This exam consists of 21 questions on 9 pages. CHEM 177 Hour Exam I May 29, 2007 Name______________________ Recitation Instructor Circle one: Cherry Gloria GRADING PAGES Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 TOTAL POINTS 18 pts 12 pts 18 pts 12 pts 18 pts 14 pts 14 pts 106 pts SCORE ________ ________ ________ ________ ________ ________ ________ Note: The method that you use in solving questions must be clearly shown to receive full credit. Questions are written on both sides of each page. A periodic table is on the last page of the exam. This may be removed and used for scratch paper and reference. Do not put answers on the periodic table page – it will not be graded. Answer Key
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2 1. (4 pts) Identify each of the following as either a chemical or a physical change. Description of process chemical or physical change? burning of a match chemical dissolving sugar in water physical Use the boxes below to answer questions 2 and 3. Each of the symbols represents an atom of a different type: 2. (4 pts) Which box or boxes contain a pure substance? A. iii B. i & ii C. ii & iii D. i & iv E. iv 3. (4 pts) Which box or boxes contain a gas? A. iii B. i & ii C. ii & iii D. i & iv E. iv 4. (4 pts) Which one of the following is a homogeneous mixture? A. steel, an alloy of Fe, C, etc. B. glucose, C 6 H 12 O 6 C. bromine Br 2 D. chocolate chip cookie E. table salt, NaCl 5. (2 pts) How many significant figures are in the number? 0.0050910 A. 3 B. 4 C. 5 D. 7 E. 8 i ii iii iv
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3 6. For each of the following round the answer to the correct number of significant figures. A. (2 pts) 2.30 × 10 –14 2.349 1121 = 4.81954 × 10 –17 4.82 × 10 –17 B. (2 pts) 45.12 – 0.08 + 141.016 = 186.056 186.06 C. (2 pts) 11.9 121.19 – 120.0 5.148 × 10 2 = 5.1480 × 10 3 5.1 × 10 3 7. (6 pts) Match the following experimental description with the classic finding of that experiment. Rutherford detected alpha particles that were scattered by a thin gold foil A. discovered electrons and measured the charge-to-mass ratio of electrons. Milikan used ionizing radiation to give
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177Exam1KeySS07 - Prof. Joe Burnett Summer 2007 This exam...

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