MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

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1 CHM 210 Chemistry Homework #3 Compounds and Their Bonds (Ch. 4) Due: MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The octet rule indicates that A) all of the noble gases have eight total electrons. B) all of the shells in an atom hold a maximum of 8 electrons. C) atoms lose, gain, or share valence electrons to have 8 valence electrons. D) the noble gases react with other compounds to get 8 valence electrons. E) all of the Group A elements have 8 valence electrons. 2) In ionic compounds, lose their valence electrons to form positively charged. A) metals, polyatomic ions B) metals, cations C) nonmetals, cations D) nonmetals, anions E) metals, anions 3) What is the symbol for the ion with 19 protons and 18 electrons? A) F- B) F+ C) Ar+ D) K- E) K+ 4) An anion always A) contains a group of two or more atoms with a positive charge. B) has a positive charge. C) has a negative charge. D) forms covalent bonds. E) contains a metal and a nonmetal. 5) Elements in group 2A(2) of the periodic table form ions with a charge of A) 1+. B) 2+. C) 1-. D) 0. E) 3+. 6) How many electrons will chlorine gain or lose when it forms an ion? A) lose 1 B) gain 2 C) gain 1 D) lose 3 E) lose 7 7) The correct formula for a compound formed from the elements Al and O is A) Al3O2. B) AlO3. C) Al2O3. D) AlO. E) Al2O. 8) The correct formula for the compound formed from Mg and S is A) Mg2S3. B) MgS. C) Mg2S. D) Mg2S2. E) MgS2. 9) Which one of the following compounds contains an ion with a 3+ charge? A) Na2O B) KCl C) FeCl3 D) CuCl E) MgCl2 1

2 10) The compound MgCl2 is named A) dimagnesium chloride. B) magnesium dichloride. C) magnesium (II) chloride. D) magnesium chloride. E) magnesium chlorine. 11) What is the correct formula for the iron (II) ion? A) Fe3- B) Fe+ C) Fe2- D) Fe3+ E) Fe2+ 12) What is the correct formula for iron (III) sulfide? A) FeS B) Fe2S C) Fe2S2 D) Fe2S3 E) FeS2 13) A(n) is the smallest neutral unit of two or more atoms held together by a covalent bond. A) formula B) ionic compound C) nucleus D) molecule E) unit 14) In a molecule with covalent bonding, A) atoms are held together by sharing electrons. B) atoms of metals form bonds to atoms of nonmetals. C) oppositely charged ions are held together by strong electrical attractions. D) atoms of different metals form bonds. E) atoms of noble gases are held together by attractions between oppositely charged ions. 15) Double and triple bonds form because A) there is at least one hydrogen atom involved in the bond. B) the atoms involved have high electronegativities. C) the ions involved have charges larger than one. D) single covalent bonds do not give all of the atoms in the molecule eight valence electrons. E) one of the atoms in the molecule has more than 8 valence electrons. 16) According to naming rules, the types of compound that use prefixes in their names are A) compounds that contain polyatomic ions. B) ionic compounds. C) polyatomic ions. D) ionic compounds involving transition metals. E) covalent compounds. 17) The correct name for the compound N2O3 is A) dinitride trioxide. B) nitrogen oxide. C) dinitrogen oxide. D) dinitrogen trioxide. E) nitrogen trioxide. 2

3 18) Which of the following compounds contains a polar covalent bond? A) O2 B) MgO C) HCl D) Br2 E) NaF 19) Ionic bonding is expected in which of these compounds? A) HF B) Cl2 C) KF D) OF2 E) H2 20) A polar covalent bond is found in which of these compounds? A) N2 B) F2 C) H2O D) H2 E) NaCl 21) The bond in Cl2 is a(n) A) nonpolar covalent bond. B) no bond. C) metallic bond. D) polar ionic bond. E) ionic bond. 22) A group of covalently bonded atoms that has an overall electrical charge is called a(n) A) ionic compound. B) anion. C) molecule. D) polyatomic ion. E) cation. 23) Which of the following polyatomic ions has a positive charge? A) hydrogen carbonate B) hydroxide C) nitrate D) ammonium E) cyanide 24) The name of the HSO - 4 ion is A) sulfate. B) sulfide. C) sulfite. D) hydrogen sulfite. E) hydrogen sulfate. 25) What is the formula of a compound that contains Na+ and PO 3-4 ions? A) Na3PO4 B) Na3P C) NaPO4 D) Na2PO3 E) Na3PO3 26) Fe2(SO4)3 is called A) iron (III) sulfate. B) iron trisulfate. C) diiron trisulfate. D) iron (II) sulfate. E) iron sulfate. 3

4 27) The VSEPR theory allows us to determine the A) bond type for a molecule. B) charge on an ion. C) shape of a molecule. D) formula for a compound. E) color of a compound. 28) The ammonia molecule ( NH3 ) is A) a nonpolar molecule with polar bonds. B) a polar molecule with nonpolar bonds. C) a nonpolar molecule with nonpolar bonds. D) a polar molecule with polar bonds. E) a polar molecule with ionic bonds. 4

5 Answer Key Testname: HOMEWORK 3 CH 4 1) C 2) B 3) E 4) C 5) B 6) C 7) C 8) B 9) C 10) D 11) E 12) D 13) D 14) A 15) D 16) E 17) D 18) C 19) C 20) C 21) A 22) D 23) D 24) E 25) A 26) A 27) C 28) D 5

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