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exam1.doc - CHEM 101 Fall 06 Exam 1 On the answer sheet...

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CHEM 101 Fall 06 Exam 1 On the answer sheet (scantron) write your Name, Student ID Number, and Recitation 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 mol -1 The speed of light is: c = 3.00 × 10 8 m/s. The Planck constant is: h = 6.626 × 10 -34 J s. The Rydberg constant is: R H = 2.179 × 10 -18 J. Δ E = - R H (/1n 2 – 1/m 2 ) E n = - R H /n 2 E = h c/ λ 1. How many grams of magnesium (Mg) contain the same number of atoms as 20 g of neon (Ne)? a. 20 g b. 24 g c. 48 g d. 12 g ANSWER: b 2. Which formula name combination is incorrect? a. N 2 O 3 and dinitrogen trioxide b. P 4 O 10 and tetraphosphorus decaoxide c. AsF 5 and arsenic pentafluoride d. SF 6 and sulfur heptafluoride ANSWER: d 3. Which of the following is not an ionic compound? a. NaOH b NaF c. CO 2 d. CaO ANSWER: c 4. A combustion reaction produces 49.4 g of CO 2 . Determine the number of moles of carbon dioxide present.
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exam1.doc - CHEM 101 Fall 06 Exam 1 On the answer sheet...

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