2007 chem 115 practice test 1

2007 chem 115 practice test 1 - Form A 1 NAME General...

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Form A NAME: ______________________ SECTION:_____ General Chemistry 115 Exam 1 Avagodro's number 6.022 x 10 23 1 kg = 2.20 lb 1 lb = 454 g 1. When you perform the following operation, how many significant figures should your answer have? Assume these are measured quantities. (6.03 x 10 -3 + 8.0112 x 10 -2 ) x (6.1157 x 10 3 ) a. 1 b. 2 c. 3 d. 4 e. 5 f. 6 g. 7 h. 8 2. How many pounds (lb) in 6.67 x 10 5 mg? a. 545 lb b. 7.22 x 10 4 lb c. 3.87 x 10 2 lb d. 1.47 lb e. 1.85 x 10 -3 lb f. 0.00824 lb g. 5.92 x 10 -4 lb h. 9.79 x 10 -1 lb 3. Arrange the following in order of increasing number of carbon atoms. (Lowest to highest.) I. 6 g 12 C II. 1.5 mole C 2 H 2 III. 9.9 x 10 23 molecules CO 2 IV. 100,000,000,000,000 C 6 H 6 molecules. a. I, II, IV, III b. IV , I , III , II c. I, IV, II, III d. III, II, IV, I e. IV, II, I, III f. IV, III, I, II g. I, IV, III, II 4. How many H atoms are in 9.99 x 10 7 g of ammonium hydroxide? a. 5.01 x 10 23 b. 104 x 10 19 c. 6.29 x 10 25 d. 8.58 x 10 30 e. 2.55 x 10 26 f. 2.73. x 10 23 g. 7.20 x 10 29 h. 1.81 x 10 24 1 1
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Form A 4. A 1.304 gram sample of a compound containing only C, H and Fe was analyzed using combustion analysis. 3.084 g CO 2 and 0.633 g H 2 O were produced. What is the empirical formula? a.
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2007 chem 115 practice test 1 - Form A 1 NAME General...

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