CHEMISTRY SEMESTER 2 FINAL EXAM REVIEW QUESTIONS..

1. CHEMISTRY SEMESTER 2 FINAL EXAM REVIEW QUESTIONS.. Ch.6-17

2. Chapter 6 1. A chemical bond results from the mutual attraction of the nuclei for A. electrons. B. neutrons. C. protons. D. dipoles.

3. Chapter 6 1. A chemical bond results from the mutual attraction of the nuclei for A.electrons. B. neutrons. C. protons. D. dipoles.

4. Chapter 6 2. A polar covalent bond is likely to form between two atoms that A. are similar in electronegativity. B.are of similar size. C. differ in electronegativity. D. have the same number of electrons.

5. Chapter 6 2. A polar covalent bond is likely to form between two atoms that A. are similar in electronegativity. B.are of similar size. C.differ in electronegativity. D. have the same number of electrons.

6. Chapter 6 3. The Lewis structure of HCN contains A. one double bond and one single bond. B. one triple bond and one single bond. C. two single bonds. D. two double bonds.

7. Chapter 6 3. The Lewis structure of HCN contains A. one double bond and one single bond. B. one triple bond and one single bond. C. two single bonds. D. two double bonds.

8. Chapter 6 4. According to VSEPR theory, the molecular geometry for is A. tetrahedral. B. trigonal-pyramidal. C. bent or angular. D. None of the above

9. Chapter 6 4. According to VSEPR theory, the molecular geometry for is A. tetrahedral. B. trigonal-pyramidal. C. bent or angular. D. None of the above

10. Chapter 6 5. Which molecule contains a double bond? A. COCl2 B. C2H6 C. CF4 D. SF2

11. Chapter 6 5. Which molecule contains a double bond? A. COCl2 B. C2H6 C. CF4 D. SF2

12. Chapter 6 6. Which molecule is polar? A. CCl4 B. CO2 C. SO3 D. none of these

13. Chapter 6 6. Which molecule is polar? A. CCl4 B. CO2 C. SO3 D.none of these

14. Chapter 6 7. What is the hybridization of the carbon atoms in CH4? A. sp B. sp2 C. sp3 D. The carbon atoms do not hybridize in C2H2.

15. Chapter 6 7. What is the hybridization of the carbon atoms in CH4? A. sp B. sp2 C. sp3 D. The carbon atoms do not hybridize in C2H2.

16. Chapter 6 8. Which of the following compounds is predicted to have the highest boiling point? A.HCl B. CH3COOH (Note: the two oxygen atoms bond to the carbon) C. Cl2 D. SO2

17. Chapter 6 8. Which of the following compounds is predicted to have the highest boiling point? A.HCl B. CH3COOH (Note: the two oxygen atoms bond to the carbon) C. Cl2 D. SO2

18. Chapter 6 9. An unknown substance is an excellent electrical conductor in the solid state and is malleable. What type of chemical bonding does this substance exhibit? A.ionic bonding B.molecular bonding C.metallic bonding D.cannot determine from the information given

19. Chapter 6 9. An unknown substance is an excellent electrical conductor in the solid state and is malleable. What type of chemical bonding does this substance exhibit? A.ionic bonding B.molecular bonding C.metallic bonding D.cannot determine from the information given

20. Chapter 6 10. What does the hybridization model help explain? a.Explains how the orbitals of an atom become rearranged when the atom forms covalent bonds. b. Geometry of molecule c. Rates of reactions d. Polarity of a bond

21. Chapter 6 10. What does the hybridization model help explain? a.Explains how the orbitals of an atom become rearranged when the atom forms covalent bonds. b. Geometry of molecule c. Rates of reactions d. Polarity of a bond

22. Chapter 6 12. Naphthalene, C10H8, is a nonpolar molecule and has a boiling point of 218°C. Acetic acid, CH3CO2H, is a polar molecule and has a boiling point of 118°C. Which substance has the stronger intermolecular forces? Briefly explain your answer.

23. Chapter 6 12. Naphthalene, C10H8, is a nonpolar molecule and has a boiling point of 218°C. Acetic acid, CH3CO2H, is a polar molecule and has a boiling point of 118°C. Which substance has the stronger intermolecular forces? Briefly explain your answer. Answer:Naphthalene has the stronger intermolecular forces even though it is nonpolar, because its boiling point is higher than that of acetic acid. Boiling point is directly correlated to strength of intermolecular forces; the stronger the intermolecular forces, the more energy needed to break all the intermolecular forces, and therefore the higher the boiling point. Naphthalene is so large that its dispersion forces are greater than the sum of the dispersion forces and hydrogen bonding in acetic acid.

24. Chapter 7 1. Which of the following compounds does not contain a polyatomic ion? A. sodium carbonate B. sodium sulfate C. sodium sulfite D. sodium sulfide

25. Chapter 7 1. Which of the following compounds does not contain a polyatomic ion? A. sodium carbonate B. sodium sulfate C. sodium sulfite D. sodium sulfide

26. Chapter 7 2.The correct formula for ammonium phosphate is A. (NH4)3PO4. B. (NH4)2PO4. C. NH4PO4. D. NH4(PO4)2.

27. Chapter 7 2.The correct formula for ammonium phosphate is A. (NH4)3PO4. B. (NH4)2PO4. C. NH4PO4. D. NH4(PO4)2.

28. Chapter 7 When writing the formula for a compound that contains a polyatomic ion, A. write the anion’s formula first. B. use superscripts to show the number of polyatomic ions present. C. use parentheses if the number of polyatomic ions is greater than 1. D. always place the polyatomic ion in parentheses.

29. Chapter 7 When writing the formula for a compound that contains a polyatomic ion, A. write the anion’s formula first. B. use superscripts to show the number of polyatomic ions present. C. use parentheses if the number of polyatomic ions is greater than 1. D. always place the polyatomic ion in parentheses.

30. Chapter 7 The correct name for NH4CH3COO or NH4CH2COOH is A. ammonium carbonate. B. ammonium hydroxide. C. ammonium acetate. D. ammonium nitrate.

31. Chapter 7 The correct name for NH4CH3COO or NH4CH2COOH is A. ammonium carbonate. B. ammonium hydroxide. C. ammonium acetate. D. ammonium nitrate.

32. Chapter 7 Which of the following is the correct formula for iron(III) sulfate? A. Fe3SO4 B. Fe3(SO4)2 C. Fe2(SO4)3 D. 3FeSO4

33. Chapter 7 Which of the following is the correct formula for iron(III) sulfate? A. Fe3SO4 B. Fe3(SO4)2 C. Fe2(SO4)3 D. 3FeSO4

34. Chapter 7 The molecular formula for acetylene is C2H2. The molecular formula for benzene is C6H6. The empirical formula for both is A. CH. B. C2H2. C. C6H6. D. (CH)2.

35. Chapter 7 The molecular formula for acetylene is C2H2. The molecular formula for benzene is C6H6. The empirical formula for both is A. CH. B. C2H2. C. C6H6. D. (CH)2.

36. Chapter 7 Which of the following shows the percentage composition of H2SO4? A. 2.5% H, 39.1% S, 58.5% O B. 2.1% H, 32.7% S, 65.2% O C. 28.6% H, 14.3% S, 57.1% O D. 33.3% H, 16.7% S, 50% O

37. Chapter 7 Which of the following shows the percentage composition of H2SO4? A. 2.5% H, 39.1% S, 58.5% O B. 2.1% H, 32.7% S, 65.2% O C. 28.6% H, 14.3% S, 57.1% O D. 33.3% H, 16.7% S, 50% O

38. Chapter 7 Which of the following compounds has the highest percentage of oxygen? A. CH4O B. CO2 C. H2O D. Na2CO3

39. Chapter 7 Which of the following compounds has the highest percentage of oxygen? A. CH4O B. CO2 C. H2O D. Na2CO3

40. Chapter 7 The empirical formula for a compound that is 1.2% H, 42.0% Cl, and 56.8% O is A. HClO. B. HClO2. C. HClO3. D. HClO4.

41. Chapter 7 The empirical formula for a compound that is 1.2% H, 42.0% Cl, and 56.8% O is A. HClO. B. HClO2. C. HClO3. D. HClO4.

42. Chapter 7 When a new substance is synthesized or is discovered experimentally, the substance is analyzed quantitatively. What information is obtained from this typical analysis, and how is this information used?

43. Chapter 7 When a new substance is synthesized or is discovered experimentally, the substance is analyzed quantitatively. What information is obtained from this typical analysis, and how is this information used? Answer:The percentage composition is obtained and used to determine the substance’s empirical formula.

44. Chapter 7 An oxide of selenium is 28.8% O. Find the empirical formula. Assuming that the empirical formula is also the molecular formula, name the oxide.

45. Chapter 7 An oxide of selenium is 28.8% O. Find the empirical formula. Assuming that the empirical formula is also the molecular formula, name the oxide. Answer:SeO2; selenium dioxide

46. Chapter 7 What is an empirical formula, and how does it differ from a molecular formula?

47. Chapter 7 What is an empirical formula, and how does it differ from a molecular formula? Answer:The empirical formula is the simplest whole-number ratio of the atoms in a chemical formula. The molecular formula is the actual number of atoms of each element in a chemical formula. The two formulas differ by an integer factor.

48. According to the law of conservation of mass, the total mass of the reacting substances is A. always more than the total mass of the products. B. always less than the total mass of the products. C. sometimes more and sometimes less than the total mass of the products. D. always equal to the total mass of the products. Chapter 8

49. According to the law of conservation of mass, the total mass of the reacting substances is A. always more than the total mass of the products. B. always less than the total mass of the products. C. sometimes more and sometimes less than the total mass of the products. D. always equal to the total mass of the products. Chapter 8

50. To balance a chemical equation, you may adjust the A. coefficients. B. subscripts. C. formulas of the products. D. either the coefficients or the subscripts. Chapter 8