CHEMICAL BONDING - CH 2 -
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1 CHEMICAL BONDING - CH 2 - Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. Electron dot diagrams are used to represent the Lewis model of the arrangement of electrons in atoms. Which of the following statements regarding electron dot diagrams is false? a. The element symbol represents the nucleus and filled energy levels of the atom. b. Electron dot diagrams were developed by G.N. Lewis. c. Dots represent the valence electrons of the atom. d. Four valence orbitals are represented by the four sides of the element symbol. e. Pairs of dots around the symbol represent the bonding capacity of the atom. 2. According to the Lewis model of the atom, the number of bonding electrons in a nitrogen atom is a. 1 d. 5 b. 2 e. 7 c Which of the following atoms is believed to contain three lone pairs of electrons? a. H d. C b. Al e. Cl c. B 4. According to Lewis theory, the number of lone pairs of electrons in the valence orbitals of a phosphorus atom is a. 1 d. 4 b. 2 e. 5 c The number of valence electrons in a fluorine atom is a. 1 d. 7 b. 3 e. 9 c Binary ionic compounds a. contain two ions with charges of 2+ and 2 b. are formed from the combination of two nonmetal ions c. are composed of only two kinds of monatomic ions d. contain a transition metal cation e. contain double bonds 7. The empirical formulas of ionic compounds are explained using a. equal numbers of positive and negative ions b. a net electrical charge of zero c. double bonds d. neutral molecular entities e. IUPAC prefixes 8. Multivalent metals a. can form more than one ion, each with its own charge b. can exist in several different crystalline forms c. appear only in the representative metal groups d. contain more than one populated energy level e. form an ion whose charge is 2+ or greater
2 9. The substance NH 3 is a very important industrial chemical. It is used directly as a fertilizer and is also used to produce many other useful chemicals. The IUPAC name of this substance is a. hydrogen nitride d. octane b. ammonia e. ammonium c. hydrogen peroxide 10. The IUPAC name for NO 2 is a. nitrite d. nitrogen dioxide b. nitrate e. dinitrogen dioxide c. dinitrogen oxide 11. The IUPAC name for P2I 4(s) is a. phosphorus iodide d. phosphorus pentaiodide b. diphosphorus tetraiodide e. dipotassium tetraiodide c. tetraphosphorus diiodide 12. The chemical formula for iodine pentafluoride liquid is a. IF5(l) d. I2F5(l) b. I5 F(l) e. I5F c. I5F5(l) 13. Which of the following statements about atoms and molecules is correct? a. Atoms contain one or more molecules. b. Molecules are impure substances. c. Molecules contain two or more atoms. d. Only elements contain atoms; all compounds contain molecules. e. Only pure substances contain atoms; mixtures contain molecules. 14. The correct formula for nitrous acid is a. HNO3(aq) d. N2H4(aq) b. HNO2(aq) e. NH 4+ c. NH 3(aq) 15. The systematic IUPAC name for HBr (aq) is a. aqueous bromine d. hydrobromic acid b. aqueous hydrogen bromide e. bromic acid c. hypobromic acid 16. The IUPAC name for HNO 2(aq) is a. aqueous hydrogen nitrate d. nitric acid b. aqueous hydrogen nitrite e. sulfuric acid c. nitrous acid 17. Aqueous hydrogen sulfate is more commonly known by its classical name, a. hydrosulfurous acid d. sulfuric acid b. hydrosulfuric acid e. sulfurous acid c. aqueous hydrogen sulfite 18. Hydroselenic acid is a very toxic substance. Its chemical formula is a. HSe(aq) d. H2SeO3(aq) b. H2SeO2(aq) e. H2SeO4(aq) c. H Se 2 (aq) 19. A student records the following evidence in a lab book.
3 Unknown Substance Pure State Solubility in Water Solution Conductivity I solid high low II solid low low III solid high none IV solid high high Which of the substances shown in the table above is most likely an ionic compound? a. I d. IV b. II e. none of the above c. III 20. According to present theory, which of the following chemical formulas represents a pure substance containing covalent bonds? a. NaCl d. BaO b. NiF2 e. SO3 c. PbO Which of the following formulas does NOT represent a molecular compound? a. CO(g) d. CH4(g) b. Co(s) e. NH3(l) c. CO 2(g) 22. Which of the following formulas does NOT represent a molecular compound? a. CO2(g) d. PCl5(g) b. CoCl2(s) e. HCl(g) c. SO 2(g) 23. To explain the bending of a liquid stream by a charged rod, chemists use the theoretical concept of a. covalent bonds d. London dispersion forces b. hydrogen bonds e. polar molecules c. ionic bonds 24. An electron dot diagram for a nitrogen atom should show a. 1 lone pair and 3 bonding electrons d. 3 lone pairs and 1 bonding electrons b. 2 lone pairs and 2 bonding electrons e. 3 bonding electrons c. 2 lone pairs and 3 bonding electrons 25. The concept of multiple covalent bonds is used to explain the molecular formula of a. O2 d. F2 b. NaCl e. NaOH c. C2H6 26. The IUPAC name for Na2CO 3(s) is a. sodium(ii) carbonate d. napthium carbonate b. sodium(ii) carbonite e. sodium carbonate c. sodium carbon trioxide 27. The IUPAC name for HCl (aq) is a. chloric acid d. hydrochloric acid b. aqueous hydrogen chloride e. aqueous hydrogen chlorate c. aqueous hydrogen monochloride 28. The IUPAC name for SO 3(g) is a. sulfur trioxide d. sulfur oxate b. sulfur(ii) oxide e. monosulfur trioxide c. sulfur oxide
4 29. The IUPAC name for KMnO 4(s) is a. krypton manganese tetraoxide d. potassium manganese oxide b. potassium manganate e. potassium monomanganese tetraoxide c. potassium permanganate 30. The IUPAC name for CaCl 2(s) is a. calcium chloride d. calcium chlorate b. calcium(ii) chloride e. monocalcium dichloride c. calcium dichloride 31. The IUPAC name for Fe2O 3(s) is a. iron(ii) oxide d. iron(iii) oxide b. iron trioxide e. ferric oxide c. iron oxide 32. The IUPAC name for AgNO 3(s) is a. silver(i) nitrite d. silver nitrogen trioxide b. silver nitrate e. silver(ii) nitrite c. silver(i) nitrate 33. The IUPAC name for CuO is a. copper oxide d. cuprous oxide b. copper(i) oxide e. copper(ii) oxide c. copper monoxide 34. The formula for lithium sulfate is a. Li1SO4(s) d. Li3SO4(s) b. Li2SO3(s) e. Li1SO3(s) c. Li2SO4(s) 35. The formula for hydrogen peroxide is a. H2O2(l) d. H3O2(l) b. H2 O(l) e. H3 O(l) c. HO 2(l) 36. The formula for carbon tetrachloride is a. C1Cl4(l) d. CCl4(l) b. C4Cl4(l) e. C4Cl1(l) c. C1 Cl(l) 37. What is the formula for zinc chloride? a. ZnCl(s) d. Zn1Cl2(s) e. Cl b. ZnCl2(s) Zn2 1(s) c. Zn1Cl1(s) 38. What is the formula for cadmium oxide? a. CdO2(s) d. Cd1O2(s) b. Cd2O2(s) e. CdO(s) c. Cd O 2 (s) 39. What is the formula for aqueous hydrogen fluoride? a. HFl(aq) d. HF b. HFO e. H F c. HF (aq) 3(aq) 2 (aq)
5 40. What is the formula for copper(ii) nitrite? a. Cu 2(NO 3 )(s) d. Cu 2(NO 2 )(s) b. Cu(NO 3) 2(s) e. Cu(NO 3 )(s) c. Cu(NO 2) 2(s) 41. What is the formula for potassium oxide? a. K2 O(s) d. KO(s) b. K2O2(s) e. P2O2(s) c. KO 2(s) 42. Which of the following is the proper electron dot diagram for NaCl? a. d. b. e. c. 43. When magnesium is burned in oxygen, the substance formed has the formula a. MgO2(s) d. MgO(s) e. b. MnO2(s) Mg2O2(s) c. Mg2 O(s) 44. An example of a binary compound is a. NaOH d. CaCO 3 b. O2 e. Co c. H2S 45. Which one of the following formulas is incorrect? a. Cu2O d. Ba(HCO 3) 2 b. NaOH e. ZnCl 3 c. CO 46. The valence of the dihydrogen phosphite ion (H2PO 3) is a. 1 d. 1+ b. 2 e. none of the above c A compound composed of sodium, sulfur, and oxygen would be named a. sodium peroxide d. sodium sulfate b. sulfuric acid e. sodium hydroxide c. sodium sulfide 48. If the name of a chemical compound ends in "ide", the compound is a. acidic d. an oxide b. binary e. none of the above c. basic 49. In which of the following pairs of ions do both names end in "ate"? a. ClO 3, ClO 2 d. CO32, SO42 b. NO 3, NO 2 e. SO32 -, MnO 4 c. CO32, SO If the classical name of an acidic substance has the ending "...ic acid", then the formula for the "per...ic acid" of the same family is obtained by
6 a. removing two oxygen atoms d. adding one oxygen atom b. removing all of the oxygen atoms e. subtracting one oxygen atom c. subtracting one hydrogen atom 51. If XF 2 is the correct formula for a metallic fluoride, then the formula for the oxide of X is a. X2O d. XO2 b. XO e. X2O2 c. XO A metallic element X forms a carbonate with the formula X(CO 3) 2. The corresponding fluoride compound of element X would have the formula a. XF d. X4F b. XF2 e. XF4 c. X4F2 53. A metallic element M reacts with oxygen to form an oxide with the formula M2O 3. The formula of the corresponding chloride of the metal will be a. MCl3 d. M2Cl b. MCl e. M2Cl2 c. MCl 2
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