Exam1 - MULTIPLE CHOICE. Choose the one alternative that...

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MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1. Which of the following numbers has 3 significant digits? (a) 0.003 (b) 3.003 (c) 0.303 (d) 0.030 (e) 3.300 2. A sulfide, S 2- , has the same number of electrons as a(n) (a) silicon atom (b) argon atom (c) ion P 3+ (d) ion Cr 2+ (e) sulfur atom 3. When an atom loses electrons, it forms a(n) (a) isotope (b) cation (c) anion (d) new atom (e) noble gas 4. What is the correct formula of diphosphorous pentasulfide? (a) P 5 S 2 (b) PS 5 (c) P 2 (SO 4 ) 5 (d) P 2 S 5 (e) (P 2 S) 5 5. How many milliliters are in 20 mm 3 ? (a) 20 (b) 2 x 10 -3 (c) 2.0 (d) 2000 (e) 0.02 6. Nitrogen monoxide (nitrous oxide) is often used for accelerating cars in car racing. After balancing the reaction C 8 H 18 + NO → CO 2 + H 2 O + N 2 using smallest whole number integers, the coefficient of NO is _____________. (a) 17 (b) 25 (c) 34 (d) 41 (e) 50
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7. Compound Mn 2 O 3 is named (a) manganese oxide (b) dimanganese trioxide (c) manganese (II) oxide (d) manganese (IV) oxide (e) manganese (III) oxide 8. Which of the following could be different isotopes of the same unknown element? 1. X 275 121 2. X 275 122 3. X 276 121 4. X 275 120 5. X 277 121 (a) 1, 2 and 3 (b) 1, 3 and 5 (c) 2 and 4 (d) all of the these (e) no isotopes may be found among 1 – 5 9. How many neutrons are there in a 238 U 4+ ion? (a) 146 (b) 92 (c) 150 (d) 88 (e) 330 10. Calculate the mass of lead in 139 g of Pb(NO 3 ) 2 . (a) 107 g
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This note was uploaded on 04/08/2008 for the course CHEM 1307 taught by Professor Li during the Spring '08 term at Texas Tech.

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Exam1 - MULTIPLE CHOICE. Choose the one alternative that...

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