Sample problems, exam keys and syllabus

Sample problems, exam keys and syllabus - Chemistry 211...

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Chemistry 211 Sample problems Atomic Structure : 1. An atom of the most common isotope of platinum, Pt 194 78 , has __ protons, ___ neutrons, and ___electrons. a. 194, 78, 78 c. 78, 194, 78 b. 78, 116, 78 d. 78, 116, 78 2. Which species has 30 electrons? a. Ni 58 28 c. + 4 80 34 Se b. + 2 63 29 Cu d. - 2 64 30 Zn 3. Which element is represented by + 2 55 25 X a. cesium c. zinc b. yttrium d. manganese 4. Which statement is correct? a. protons, neutrons and electrons together uniformly occupy the total volume of the atom b. electrons and protons have most of the mass and occupy very little space. c. neutrons and protons have most of the mass and occupy most of the space. d. electrons occupy most of the space and have very little of the mass of the atom. 5. The number of neutrons in the - 2 80 34 X a. 32 c. 36 b. 46 d. 80 6. Which statement is correct? a. electrons and neutrons are located in the nucleus. b. neutrons and protons have most of the mass and occupy very little space. c. neutrons and protons have most of the mass and very little space. d. electrons occupy most of the space and have the same mass as the protons. 7. Chlorine (Z = 17) can have a charge of +7; how many electrons would this ion have? a. 10 c. 7 b. 17 d. 24 8. Chlorine (Z = 17) can have a charge of +7; how many protons would this ion have? a. 10 c. 7
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b. 17 d. 24 9. An element has two naturally occurring isotopes with atomic abundances of 15% 23 X and 85% 24 X. The atomic mass should be closest to a. 23.7 c. 12.0 b. 22.3 d. 23.0 10. An element has two naturally occurring isotopes with atomic abundances of 85% 23 X and 15% 24 X. The atomic mass should be closest to a. 23.7 c. 12.0 b. 22.3 d. 23.0 11. An element has two naturally occurring isotopes, 23 X and 25 X, and an atomic mass of 23.8. The % abundance of the first isotope is approximately a. 80% c. 45% b. 20% d. 55% 12. How many valence shell p electrons should be in a Group 5A element? a. 3
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This note was uploaded on 07/08/2009 for the course CHEM 211 taught by Professor Papanastasiou during the Spring '07 term at George Mason.

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Sample problems, exam keys and syllabus - Chemistry 211...

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