Practice Exam 1a - Practice Exam 1a 3478 1164 . . + 0.354 ?...

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3478 1164 200 0354 . . . . ? × + Practice Exam 1a 1. What is the best answer to report for (A) 2.378 (B) 2.3782 (C) 2 (D) 2.4 (E) 2.38 2. 1.0 g of rhenium, Re, was isolated from 660 kg of the ore molybdenite. The percent by mass of this element in the molybdenite was (A) 1.5 × 10 -4 %. (B) 0.15%. (C) 0.66%. (D) 6.6 × 10 -3 %. (E) 3.5 × 10 -4 %. 3. A sheet of Xerox paper measures 8.5 × 11.0 inches. What is the surface area of one side of the paper in cm 2 ? (A) 6.03 × 10 2 cm 2 (B) 94 cm 2 (C) 6 × 10 2 cm 2 (D) 6.0 × 10 2 cm 2 (E) 93.5 cm 2 4. Which of the following is an example of a chemical change? (A)alcohol evaporating (B) water boiling (C) iodine vaporizing (D)charcoal burning (E) ice melting 5. The following species, 34 Se 2- , 36 Kr, and 38 Sr 2+ , all have the same number of (A)nucleons. (B) protons. (C) isotopes. (D)neutrons. (E) electrons. 1
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6. Which combination represents a 57 Fe 3+ ion? (p = protons, n = neutrons, e = electrons) (A)26p, 31n, 26e (B) 26p, 31n, 29e (C) 26p, 31n, 23e (D)57p, 26n, 23e (E) 57p, 26n, 54e 7. The atomic mass of Ga is 69.72. There are only two naturally occurring isotopes of gallium, 69 Ga with a mass of 69.0 and 71 Ga with a mass of 71.0. The natural abundance of the 71 Ga isotope must be approximately (A) 20%. (B) 60%. (C) 80%.
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Practice Exam 1a - Practice Exam 1a 3478 1164 . . + 0.354 ?...

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