Homework-1-BSC

# Homework-1-BSC - 1. The average distance from Earth to the...

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1. The average distance from Earth to the Sun is 150 megameters. What is that distance in meters? A. 1.5 × 10 8 m B. 1.5 × 10 6 m C. 1.5 × 10 5 m D. 1.5 × 10 3 m E. 1.5 × 10 –6 m 2. The density of mercury, the only metal to exist as a liquid at room temperature, is 13.6 g/cm 3 . What is that density in pounds per cubic inch? A. 849 lb/in 3 B. 491 lb/in 3 C. 376 lb/in 3 D. 0.491 lb/in 3 E. 1.83 × 10 –3 lb/in 3 3. At a pressure of one billionth (10 –9 ) of atmospheric pressure, there are about 2.7 × 10 10 molecules in one cubic centimeter of a gas. How many molecules is this per cubic meter? A. 2.7 × 10 16 B. 2.7 × 10 14 C. 2.7 × 10 12 D. 2.7 × 10 8 E. 2.7 × 10 4 4. Select the answer that expresses the result of this calculation with the correct number of significant figures. A. 13.3568 B. 13.357 C. 13.36 D. 13.4 E. 13 5. Which of the following represents the largest volume? A. 10,000 µL B. 1000 pL C. 100 mL D. 10 nL E. 10 cm 3 6. How many atoms are in a drop of mercury that has a diameter of 1.0 mm? (Volume of a sphere is 4 π r 3 /3; density of mercury = 13.6 g/cm 3 ) A. 2.1 × 10 19 B. 1.7 × 10 20 C. 2.1 × 10 22 D. 1.7 × 10 23 E. none of the above 7. The difference between a student's experimental measurement of the density of sodium chloride and the known density of this compound reflects the ___________ of the student's result. A. accuracy B. precision C. random error D. systematic error E. indeterminate error 8. Which of the following symbols does not represent an element? A. O 2 B. Co C. HF D. Cs E. Xe 9. Bromine is the only nonmetal that is a liquid at room temperature. Consider the isotope bromine-81, . Select the combination which lists the correct atomic number, neutron number, and mass number, respectively. A. 35, 46, 81 B. 35, 81, 46 C. 81, 46, 35 D. 46, 81, 35

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E. 35, 81, 116 10. The atoms of uranium have the following nuclear compositions: Which are isotopes? A. 1 and 2 B. 3 and 4 C. 1 and 5 D. 2 and 3 E. 1 and 3 11. What is the chemical symbol for the group 6A (16) element that lies in period 4? A. Cr B. Hf C. W D. Ti E. Se 12. Which of the following compounds is ionic? A. PF 3 B. CS 2 C. HCl D. SO 2 E. MgCl 2 13. Which of the following ions occurs commonly? A. N 3+ B. S 6 + C. O 2– D. Ca + E. Cl + 14. Which of the following is the empirical formula for hexane, C 6 H 14 ? A. C
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## This note was uploaded on 03/28/2012 for the course CHEMISTRY 101 taught by Professor Dr.lickerbut during the Spring '12 term at Colorado State.

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Homework-1-BSC - 1. The average distance from Earth to the...

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