MODERN CHEMISTRY. 8. What is the formula for aluminum sulfate? 9. What is the formula for barium hydroxide?
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1 MODERN CHEMISTRY Date Name Period Multiple Choice - Identify the choice that best completes the statement or answers the question. Use answer-key worksheet (Page 6) to key in answers to questions. 1. A chemical formula includes the symbols of the elements in the compound and subscripts that indicate a) atomic mass of each element. b) number of atoms or ions of each element that are combined in the compound. c) formula mass. d) charges on the elements or ions. 2. A chemical formula for a molecular compound represents the composition of a) a molecule; b) an atom; c) the ions that make up the compound; or d) the crystal lattice. 3. How many atoms of fluorine are present in a molecule of carbon tetrafluoride, CF 4? a) 1; b) 2; c) 4 or d) 5 4. The formula for carbon dioxide, CO 2, can represent a) one molecule of carbon dioxide. b) 1 mol of carbon dioxide molecules. c) the combination of 1 atom of carbon and 2 atoms of oxygen. d) all of the above. 5. What is the formula for zinc fluoride? a) ZnF; b) ZnF 2; c) Zn 2F; or d) Zn 2F 3 6. What is the formula for the compound formed by calcium ions and chloride ions? a) CaCl; b) Ca 2Cl; c) CaCl 3; or d) CaCl 2 7. What is the formula for the compound formed by lead(ii) ions and chromate ions? a) PbCrO 4; b) Pb 2CrO 4; c) Pb 2(CrO 4) 3; or d) Pb(CrO 4) 2 8. What is the formula for aluminum sulfate? a) AlSO 4; b) Al 2SO 4; c) Al 2(SO 4) 3; or d) Al(SO 4) 3 9. What is the formula for barium hydroxide? a) BaOH; b) BaOH 2; c) Ba(OH) 2; or d) Ba(OH) 10. Name the compound Ni(ClO 3) 2. a) nickel(ii) chlorate; b) nickel(ii) chloride; c) nickel(ii) chlorite; or d) nickel(ii) peroxide 11. Name the compound Zn 3(PO 4) 2. a) zinc potassium oxide; b) trizinc polyoxide; c) zinc phosphate; or d) zinc phosphite 12. Name the compound KClO 3. a) potassium chloride; b) potassium trioxychlorite; c) potassium chlorate; or d) hypochlorite 13. Name the compound Fe(NO 3) 2. a) iron(ii) nitrate; b) iron(ii) nitrite; c) iron(iii) nitrate; or d) iron(iii) nitride 14. Name the compound Al 2S 3. a) aluminum sulfate; b) aluminum sulfur; c) aluminum(ii) sulfate; or d) aluminum sulfide 15. Name the compound CF 4. a) calcium fluoride; b) carbon fluoride: c) carbon tetrafluoride; or d) monocalcium quadrafluoride 16. Name the compound SiO 2. a) silver oxide b) silicon oxide; c) silicon dioxide; or d) monosilver dioxide 17. Name the compound SO 3. a) sulfur trioxide; b) silver trioxide; c) selenium trioxide; or d) sodium trioxide MODERN CHEMISTRY 1 0F 6 CHAPTER 7 QUIZ AND CHAPTER REVIEW
2 18. Name the compound N 2O 3. a) dinitrogen oxide; b) nitrogen trioxide; c) nitric oxide; or d) dinitrogen trioxide 19. What is the formula for silicon dioxide? a) SO 2; b) SiO 2; c) Si 2O; or d) S 2O 20. What is the formula for dinitrogen trioxide? a) Ni 2O 3; b) NO 3; c) N 2O 6; or d) N 2O What is the formula for sulfur dichloride? a) SCl; ). SCl 2; c) S 2Cl; or d) S 2Cl What is the formula for diphosphorus pentoxide? a) P 2PeO 5; b. PO 5 ; c. P 2O 4; or d. P 2O What is the formula for hydrochloric acid? a) HF b) HCl c) HClO d) H 2CO The oxidation number of fluorine is a) always 0; b) 1 in all compounds; c) +1 in all compounds; or d) equal to the negative charge of all the metal ions in a compound. 25. What is the oxidation number of oxygen in most compounds? a) 8; b) -2; c) 0; or d) What is the oxidation number of a pure element? a) 1; b) 0; c) +1; or d) In a compound, the algebraic sum of the oxidation numbers of all atoms equals a) 0; b) 1: c) 8; or d) the charge on the compound. 28. What is the oxidation number of hydrogen in compounds containing metals? a) 1; b) 0; c) +1; or d) the charge on the metal ion 29. In a polyatomic ion, the algebraic sum of the oxidation numbers of all atoms is equal to a) 0; b) the number of atoms in the ion; c) 10; or d) the charge of the ion. 30. What is the oxidation number of oxygen in H 2O 2? a) 2; b) -1; c) +2; or d) What is the oxidation number of hydrogen in KH? a) 1; b) 0; c) +1; or d) What is the oxidation number of hydrogen in H 2O? a) 0; b) +1; c) +2; or d) What is the oxidation number of sulfur in SO 2? a) 0; b) +1; c) +2; or d) What is the oxidation number of sulfur in H 2SO 4? a) 2; b) 0; c) +4; or d) What is the oxidation number of oxygen in CO 2? a) 4; b) -2; c) 0; or d) Name the compound N 2O 2 using the Stock system. a) dinitrogen monoxide; b) nitrogen dioxide; ); nitrogen(ii) oxide; d) nitrogen oxide(ii) 37. Name the compound SO 2 using the Stock system. a) sulfur(ii) oxide; b) sulfur(iv) oxide; c) sulfur dioxide; d) sulfur oxide 38. Name the compound CCl 4 using the Stock system. a) carbon(iv) chloride; b) carbon tetrachloride; c) carbon chloride; or d) carbon hypochlorite 39. Name the compound H 2O using the Stock system. a) water; b) hydrogen dioxide; c) hydrogen(i) oxide; or d) hydrogen(ii) oxide 40. Name the compound CO 2 using the Stock system. a) carbon(iv) oxide; b) carbon dioxide; c) monocarbon dioxide; or d) carbon oxide MODERN CHEMISTRY 2 0F 6 CHAPTER 7 QUIZ AND CHAPTER REVIEW
3 41. Name the compound PBr 5 using the Stock system. a) potassium hexabromide; b) phosphorus(v) pentabromide; c) phosphorus(v) bromide; or d) phosphoric acid 42. The molar mass of an element is the mass of one a) atom of the element; b. crystal of the element.; c) gram of the element; or d) mole of the element. 43. What is the sum of the atomic masses of all the atoms in a formula for a compound? a) molecular mass; b) formula mass; c) atomic mass; or d) actual mass 44. What is the formula mass of magnesium chloride, MgCl 2? a) 46 amu; b) amu; c) amu; or d) amu 45. What is the formula mass of ethyl alcohol, C 2H 5OH? a) amu; b) amu; c) amu; or d) amu 46. What is the formula mass of (NH 4) 2SO 4? a) amu; b) amu; c) amu; or d) amu 47. The molar mass of MgI 2 is a) the sum of the masses of 1 mol of Mg and 2 mol of I. b) the sum of the masses of 1 mol of Mg and 1 mol of I. c) the sum of the masses of 1 atom of Mg and 2 atoms of I. d) the sum of the masses of 1 atom of Mg and 1 atom of I. 48. The molar mass of NO 2 is g/mol. How many moles of NO 2 are present in g? a) mol; b) mol; c; mol; or d) mol 49. The molar mass of CCl 4 is g/mol. How many grams of CCl 4 are needed to have mol? a) 5 g; b) g; c) g; or d) g 50. The molar mass of H 2O is g/mol. How many grams of H 2O are present in 0.20 mol? a) 0.2 g; b) 3.6 g; c) 35.9 g; or d g 51. The molar mass of LiF is g/mol. How many moles of LiF are present in g? a) mol; b) mol; c) mol; or d mol 52. The molar mass of CS 2 is g/mol. How many grams of CS 2 are present in mol? a) 0.13 g; b) g; c) g; or d) g 53. The molar mass of NH 3 is g/mol. How many moles of NH 3 are present in g? a) mol; b) mol; c) mol; or d) mol 54. What is the mass of mol glucose, C 6H 12O 6? a) 24.0 g; b) 43.2 g; c) g; or d) 750. g 55. How many Cl - ions are present in 2.00 mol of KCl? a) 1.20 x ; b) 6.02 x ; c) 2.00; or d) How many OH - ions are present in 3.00 mol of Ca(OH) 2? a) 3.00; b) 6.00; c x ; or d) 2.06 x How many oxygen atoms are there in mol of CO 2? a) 6.02 x10 23 ; b) 3.01 x ; c) ; or d) How many Mg 2+ ions are found in 1.00 mol of MgO? a) 3.01 x ; b) 6.02 x ; c x ; or d) 6.02 x If mol of Na + combines with mol of Cl - to form NaCl, how many formula units of NaCl are present? a) 3.01 x ; b) 6.02 x ; c) 6.02 x ; or d) How many molecules are there in 5.0 g of methyl alcohol, CH 3OH? a) 9.4 x ; b) 3.0 x ; c) 3.6 x ; or d) 3.8 x10 24 MODERN CHEMISTRY 3 0F 6 CHAPTER 7 QUIZ AND CHAPTER REVIEW
4 61. What is the percentage composition of CF 4? a) 20% C, 80% F; b) 13.6% C, 86.4% F; c) 16.8% C, 83.2% F; or d) 81% C, 19% F 62. What is the percentage composition of CO? a) 50%; C, 50% O; b) 12% C, 88% O; c) 25% C, 75% O; or d. 43% C, 57% O 63. What is the percentage composition of CuCl 2? a) 33% Cu, 66% Cl; b) 50% Cu, 50% Cl; c) 65.50% Cu, 34.50% Cl; or d) 47.27% Cu, 52.73% Cl 64. The percentage composition of sulfur in SO 2 is about 50%. What is the percentage of oxygen in this compound? a) 25%; b) 50%; c) 75%; or d) 90% 65. What is the mass percentage of OH - in Ca(OH) 2? a) 45.9%; b) 66.6%; c) 75%; or d) 90.1% 66. What is the mass percentage of chlorine in NaCl? a) 35.45%; b) 50%; c) 60.7%; or d) 64.5% 67. A formula that shows the simplest whole-number ratio of the atoms in a compound is the a) molecular formula; b) ideal formula; c) experimental formula; or d) empirical formula. 68. The empirical formula is always the accepted formula for a(n) a) atom; b) molecule; c) molecular compound; or d) ionic compound. 69. The empirical formula for a compound shows the symbols of the elements with subscripts indicating the a) actual numbers of atoms in a molecule. b) number of moles of the compound in 100 g. c) smallest whole-number ratio of the atoms. d) atomic masses of each element. 70. The empirical formula may not represent the actual composition of a unit of a(n) a) ionic compound; b) molecular compound; c) salt; or d) crystal. 71. What is the empirical formula for a compound that is 31.9% potassium, 28.9% chlorine, and 39.2% oxygen? a) KClO 2; b) KClO 3; c) K 2Cl 2O 3; or d) K2Cl2O5 72. What is the empirical formula for a compound that is 43.6% phosphorus and 56.4% oxygen? a) P 2O 7; b) PO 3; c) P 2O 3; or d) P 2O What is the empirical formula for a compound that is 53.3% O and 46.7% Si? a) SiO; b) SiO 2; c) Si 2O; or d) Si 2O A compound contains g of F and 40.8 g of C. What is the empirical formula for this compound? a) CF 4; b) C 4F; c) CF; or d) CF A compound contains 64 g of O and 8 g of H. What is the empirical formula for this compound? a. H 2O; b) H 2O 2; c) HO 2; or d) HO 76. What is the empirical formula for a compound that is 36.1% Ca and 63.9% Cl? a) CaCl; b) Ca 2Cl; c) CaCl 2; or d. Ca 2Cl A compound contains 27.3 g of C and 72.7 g of O. What is the empirical formula for this compound? a) CO; b) CO 2; c) C 2O; or d) C 2O To find the molecular formula from the empirical formula, one must determine the compound's a) density; b) formula mass; c) structural formula; or d) crystal lattice. MODERN CHEMISTRY 4 0F 6 CHAPTER 7 QUIZ AND CHAPTER REVIEW
5 79. A molecular compound has the empirical formula XY 3. Which of the following is a possible molecular formula? a) X 2Y 3; b) XY 4; c) X 2Y 5; or d) X 2Y The molecular formula for vitamin C is C 6H 8O 6. What is the empirical formula? a) CHO; b) CH 2O; c) C 3H 4O 3; or d) C 2H 4O Of the following molecular formulas for hydrocarbons, which is an empirical formula? a) CH 4; b) C 2H 2; c) C 3H 6; or d) C 4H Which of the following molecular formulas does not have the corresponding empirical formula XY 2Z? a) X 2Y 4Z 2; b) XYZ; c) X 6Y 12Z 6; or d) X 3Y 6Z A compound's empirical formula is C 2H 5. If the formula mass is 58 amu, what is a) C 3H 6; b) C 4H 10; c) C 5H 8; or d) C 5H A compound's empirical formula is N 2O 5. If the formula mass is 108 amu, what is a) N 2O 5; b) N 40O 10; c) NO 3; or d) N 2O A compound's empirical formula is CH. If the formula mass is 26 amu, what is a) C 2H 2; b) CH 3; c) CH 4; or d) C 4H 86. A compound's empirical formula is NO 2. If the formula mass is 92 amu, what is a) NO b) N 2O 2; c) NO 4; or d) N 2O A compound's empirical formula is CH 3. If the formula mass is 30 amu, what is a) CH 3; b) CH 4; c) C 2H 6; or d) C 3H A compound's empirical formula is HO. If the formula mass is 34 amu, what is a) H 2O; b) H 2O 2; c) HO 3; or d) H 2O What is the molecular formula of a compound that has a formula mass of amu and an empirical formula of CH 3Cl? a) CHCl; b) CH 2Cl; c) CH 3Cl; or d) CH 2Cl The molar mass of aluminum is g/mol and the molar mass of fluorine is g/mol. The molar mass of aluminum trifluoride, AlF 3 is a) g/mol; b) g/mol; c) g/mol; or d) g/mol 92. The molar mass of copper is g/mol, the molar mass of sulfur is g/mol, and the molar mass of oxygen is g/mol. The molar mass of copper(ii) sulfate, CuSO 4 is a) g/mol; b) g/mol; c) g/mol; or d) g/mol 93. The molar mass of iron is g/mol, the molar mass of silicon is g/mol, and the molar mass of oxygen is g/mol. The molar mass of iron(ii) silicate, Fe 2SiO 4 is a) g/mol; b) g/mol; c) g/mol; or d) g/mol 94. The molar mass of aluminum is g/mol and the molar mass of oxygen is g/mol. The molar mass of Al 2O 3 is a) g/mol; b) g/mol; c) g/mol; or d) g/mol 95. The name for the CrO 4 ion is a) Chromite; b) Carbon reduced Oxygen (IV); c) Chromate; or d) Chromogenn 96. The name for the NO 3- ion is a) Nitrite; b) Nitrous; c) Nitrate; or d) Nitride MODERN CHEMISTRY 5 0F 6 CHAPTER 7 QUIZ AND CHAPTER REVIEW
6 Chapter 7 Worksheet Activity Answers Key Answers (1-32) (a, b, c, or d) Answers (33-64) (a, b, c, or d) Question Question Question Answers (65-96) (a, b, c, or d) MODERN CHEMISTRY 6 0F 6 CHAPTER 7 QUIZ AND CHAPTER REVIEW
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