Chapter2 - Chapter 2 Atoms Molecules and Ions Student NOTE...

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Chapter 2 Atoms Molecules and Ions Student: ___________________________________________________________________________ NOTE: A periodic table is required to work many of the problems in this chapter. 4. An anion is defined as A. a charged atom or group of atoms with a net negative charge. B. a stable atom. C. a group of stable atoms. D. an atom or group of atoms with a net positive charge. 9. What percentage of the mass of a carbon-12 atom is contributed by its electrons? Given the mass of an electron is (1/1836) amu. A. 0.027% B. 6.0% C. 33.0% D. 50.0% E.99.97% 10. Atoms of the same element with different mass numbers are called A. ions. B. neutrons. C. allotropes. D. chemical families. E.isotopes. 11. How many neutrons are there in an atom of lead whose mass number is 208? A. 82 B. 126 C. 208 D. 290 E.none of them
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12. An atom of the isotope sulfur-31 consists of how many protons, neutrons, and electrons? (p = proton, n = neutron, e = electron) A. 15 p, 16 n, 15 e B. 16 p, 15 n, 16 e C. 16 p, 31 n, 16 e D. 32 p, 31 n, 32 e E.16 p, 16 n, 15 e 13. Give the number of protons (p), electrons (e), and neutrons (n) in one atom of chlorine-37. A. 37 p, 37 e, 17 n B. 17 p, 17 e, 37 n C. 17 p, 17 e, 20 n D. 37 p, 17 e, 20 n E.17 p, 37 e, 17 n 14. Which one of these species is an ion? A. B 3+ B. NaCl C. He D. 14 C E.none of these 15. Two isotopes of an element differ only in their A. symbol. B. atomic number. C. atomic mass. D. number of protons. E.number of electrons. 16. A magnesium ion, Mg 2+ , has A. 12 protons and 13 electrons. B. 24 protons and 26 electrons. C. 12 protons and 10 electrons. D. 24 protons and 22 electrons. E.12 protons and 14 electrons. 17. An aluminum ion, Al 3+ , has: A. 13 protons and 13 electrons B. 27 protons and 24 electrons C. 16 protons and 13 electrons D. 13 protons and 10 electrons E.10 protons and 13 electrons
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18. An oxide ion, O 2- , has: A. 8 protons and 10 electrons B. 10 protons and 8 electrons C. 8 protons and 9 electrons D. 8 protons and 7 electrons E.10 protons and 7 electrons 19. A sulfide ion, S 2- , has: A. 16 protons and 16 electrons B. 32 protons and 16 electrons C. 16 protons and 14 electrons D. 16 protons and 18 electrons E.32 protons and 18 electrons 20. How many protons and electrons are present in one Br - ion? A. 35 p, 35 e B. 80 p, 81 e C. 35 p, 34 e D. 35 p, 36 e E.80 p, 34 e 45. The mineral pyrolusite is a compound of manganese-55 and oxygen-16. If 63% of the mass of pyrolusite is due to manganese, what is the empirical formula of pyrolusite? A. MnO B. Mn 2 O C. Mn 2 O 2 D. MnO 2 E.none of these 46. The mineral manganosite is a compound of manganese-55 and oxygen-16. If 77% of the mass of manganosite is due to manganese, what is the empirical formula of manganosite? A.
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This note was uploaded on 06/12/2011 for the course CHEM 1311 taught by Professor Sibert during the Spring '08 term at University of Texas at Dallas, Richardson.

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Chapter2 - Chapter 2 Atoms Molecules and Ions Student NOTE...

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