Chapter 11 lecture for AP Chemistry on Intermolecular Forces, Liquids, and Solids.

1. Chapter 11 Intermolecular Forces, Liquids, and Solids Sections 11.1 - 11.3 Homework Read pages 443-454 Pg 476 #1, 2, 3, 9, 10, 13, 15, 16, 17, 23, 25, 29, 31

20. PRACTICE EXERCISE Of Br 2 , Ne, HCl, HBr, and N 2 , which is likely to have (a) the largest intermolecular dispersion forces, (b) the largest dipole-dipole attractive forces? Answers: (a) Br 2 (largest molecular weight), (b) HCl (largest polarity)

26. PRACTICE EXERCISE In which of the following substances is significant hydrogen bonding possible: methylene chloride (CH 2 Cl 2 ) phosphine (PH 3 ) hydrogen peroxide (HOOH), or acetone (CH 3 COCH 3 )? Answer: HOOH

27. Summarizing Intermolecular Forces

28. PRACTICE EXERCISE (a) Identify the intermolecular forces present in the following substances, and (b) select the substance with the highest boiling point: CH 3 CH 3 , CH 3 OH, and CH 3 CH 2 OH. Answers: (a) CH 3 CH 3 has only dispersion forces, whereas the other two substances have both dispersion forces and hydrogen bonds; (b) CH 3 CH 2 OH

32. Chapter 11 Intermolecular Forces, Liquids, and Solids Sections 11.4 - 11.6 Homework Read pages 455-464 Pg 477 #4, 5, 6, 35, 37, 39, 43, 45, 49, 51, 53, 55

35. Phase Changes

39. PRACTICE EXERCISE What is the enthalpy change during the process in which 100.0 g of water at 50.0°C is cooled to ice at –30.0°C? The specific heats of ice, water, and steam are 2.09 J/g-K, 4.18 J/g-K and 1.84 J/g-K, respectively. For H 2 O,  H fus = 6.01 kJ/mol  H vap = 40.67 kJ/mol. Answer: –20.9 kJ – 33.4 kJ – 6.27 kJ = –60.6 kJ

45. PRACTICE EXERCISE Estimate the boiling point of diethyl ether under an external pressure of 0.80 atm. At what external pressure will ethanol have a boiling point of 60°C? Answer: 27  C, about 340 torr (0.45 atm)

55. Describe any changes in the phases present when the system is (a) kept at 0°C while the pressure is increased from that at point 1 to that at point 5 (vertical line), (b) kept at 1.00 atm while the temperature is increased from that at point 6 to that at point 9. Figure 11.28 Phase diagram of H 2 O.

58. Chapter 11 Intermolecular Forces, Liquids, and Solids Sections 11.7 & 11.8 Homework Read pages 464- 476 Pg 477 #7, 57, 59, 71, 73, 75, 77, 79

59. BELLWORK Describe what happens when the following changes are made in a CO 2 sample initially at 1 atm and –60ºC: (a) Pressure increases at constant temperature to 60 atm. (b) Temperature increases from –60ºC to – 20ºC at constant 60 atm pressure.

72. There are two ways to define the unit cell NaCl unit cell representing appropriate ion sizes

74. The coordination number tells the number of particles surrounding a particular particle in a crystal. For ionic compounds & alloys there can be multiple coordination numbers.

75. The coordination number tells the number of particles surrounding a particular particle in a crystal. For ionic compounds & alloys there can be multiple coordination numbers.

76. The coordination number tells the number of particles surrounding a particular particle in a crystal. For ionic compounds & alloys there can be multiple coordination numbers.

77. Types of Bonding in Crystalline Solids