CHEM%20101%20Fall%2011%20Exam1b-corrected - CHEM 101 Fall...

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Page 1 of 4 CHEM 101 Fall 11 Exam I (b) On the answer sheet (scantron) write your name, student ID number, and lab section number. Choose the best (most correct) answer for each question and enter it on your answer sheet. Potentially useful data: Avogadro’s constant: 6.022 × 10 23 Speed of light: c = 3.00 × 10 8 m/s Planck constant: h = 6.626 × 10 -34 J s E = h c/λ = 1. Please choose the letter “b” as your answer for this question. 2. Carbon dioxide is always composed of three parts by weight of carbon and eight parts by weight of oxygen. This is an example of: a. The Law of Conservation of Energy. b. The Law of Conservation of Mass. c. The Law of Multiple Proportion. d. The Law of Constant Composition. e. Dalton's Atomic Theory. 3. Which of the following is not the symbol of an element? a. C b. Cr c. CO d. Cd e. Ca 4. Calculate the number of grams in 0.928 moles of nitrogen molecules (N 2 ). a. 30.2 g b. 14.0 g c. 28.0 g d. 13.0 g e. 26.0 g 5. How many grams of platinum (Pt) contain the same number of atoms as 5.0 g of lithium (Li)? a. 1.4 × 10 2 g b. 98 g c. 0.18 g d. 0.72 g e. 5.0 g 6. Which sample contains the fewest atoms? a. 10 g of N b. 10 g of C c. 10 g of O d. 10 g of Ne e. 10 g of F
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Page 2 of 4 7. Which of the following consists of all identical molecules? a. wine
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CHEM%20101%20Fall%2011%20Exam1b-corrected - CHEM 101 Fall...

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