PP1 - Chem 004 Summer 2008 GWU M.G.Z Practice Problems Unit...

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Chem 004- Summer 2008 GWU M.G.Z. 1 Practice Problems Unit 1 1. Nuclear physicists have discovered over 100 different particles that compose the nucleus of an atom. From a chemistry perspective , the nucleus is best described as being composed of A. protons and neutrons packed tightly into a very small volume B. protons and electrons packed tightly into a very small volume C. neutrons and electrons packed tightly into a very small volume D. protons, neutrons and electrons packed tightly into a very small volume 2. Essentially all of the mass of an atom is due to the A. protons B. neutrons C. nucleons D. electrons 3. The mass of the electrons in atoms is generally regarded as A. significant B. insignificant C. comparable to the mass of the nucleus D. unknown 4. The nuclear charge of a sodium atom (Na) is A. 1+ B. 11+ C. 12+ D. 23+ 5. The nuclear charge of a sodium ion (Na + ) is A. 1+ B. 11+ C. 12+ D. 23+ 6. The sum of protons and neutrons in an atom is called the A. atomic number B. atomic mass C. nuclear mass D. nucleon number 7. How many nucleons are in this isotope of calcium? 36 20 Ca A. 56 B. 36 C. 20 D. 16 8. How many neutrons are in 106 50 Sn? A. 50 B. 56 C. 106 D. 156 9. Which element contains 14 neutrons? A. 14 6 C B. 14 7 N C. 9 5 B D. 28 14 Si 10. Elements in the same period (row) of the Periodic Table have I. the same atomic number. II. the same number of energy levels. III. the same number of valence electrons. IV. the same number of core electrons. A. I and II B. II and IV C. I, II, and III D. Only IV 11. The electron dot symbol for potassium is A. K B. K : C. : K : D. : K •• •• :
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Chem 004- Summer 2008 GWU M.G.Z. 2 12. The correct electron dot structure for a Group IVA atom is A. X B. X C. X D. X 13. Which chemical reactions are balanced? I. 2 C 4 H 10 + 9 O 2 " 8 CO + 10 H 2 O II. C 4 H 10 + 14 O 2 " 4 CO 2 + 10 H 2 O III. 2 C 4 H 10 + 13 O 2 " 8 CO 2 + 10 H 2 O IV. 2 C 4 H 10 + 26 O 2 " 8 CO 2 + 10 H 2 O A. I, II, and IV B. II and III C. II and IV D. I and III 14. Which is the correct Lewis dot representation for the molecule of nitrous oxide, N 2 O? A. : N •• •• :: N : O •• •• : B. : N ::: N : O •• •• : C. : N •• :: N : O •• : D. : N :: O :: N : 15. When magnesium (Mg) and oxygen (O) are combined, they most likely form A. a single covalent bond (Mg-O) B. a double covalent bond (Mg=O) C. an ionic bond (Mg + O - ) D. an ionic bond (Mg 2+ O 2- ) 16. The number of protons in an atom is called the I. atomic mass II. atomic number III. atomic weight IV. mass number A. Only I B. Only II C. I and III D. II and IV 17. Which element has the same number of valence electrons as boron? A.
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This note was uploaded on 06/25/2008 for the course CHEM 004 taught by Professor Zysmilich during the Spring '06 term at GWU.

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PP1 - Chem 004 Summer 2008 GWU M.G.Z Practice Problems Unit...

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