20071019 Day Lecture 17 Chapter 11

# 20071019 Day Lecture 17 Chapter 11 - Todays Plan Welcome to...

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1 Welcome to CHM 1220/1225 Please turn off cell phones pages iPods Thank you! Today’s Plan Announcements Complete Chapter 11 • Pre-lecture Assignment 18 will be available at 2:00 p.m. today and is due by noon, Monday, October 22, 2007. • Chapter 11 Quiz is due by noon, Monday, October 22, 2007. • Chapter 11 Homework is due by 12:50 p.m. Monday, October 22, 2007 Exam II Frequency vs Score Range 460 exams, average 93.5 0 20 40 60 80 100 120 > = 135 >=120 >=1 05 >=9 0 >=7 5 60 45 30 Score Range Number in Range Average Percent on Problem 0.0 20.0 40.0 60.0 80.0 100.0 #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 Problem Percent Number of Zeroes per Problem 0 50 100 150 200 #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 Problem Number of Zeroes

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2 There were issues with the exam: Exam distribution took longer than expected. The goldenrod version had several errors; although they were posted on the screen, the last one – about #8 – was not announced The tan form also had several errors The time seemed inadequate So I studied the scores in several ways. I first compared the averages on the different forms: Form A (white) 90.6(29.3) for 153 exams Form B (goldenrod) 94.3(28.5) for 171 exams Form C (tan) 95.8(28.9) for 136 exams Overall 93.5(28.9) for 460 exams These averages are statistically the same. The high scores were also similar: 146, 142, 142. Average Score by Version 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 1234567891 0 Problem Average Score Series1 Series2 Series3 Zeroes by Version 0 10 20 30 40 50 60 70 0 Problem Number of Zeroes Series1 Series2 Series3 • These data led me to believe that the primary issue was time. • As a result I will add 10 points to each score. Chapter 11 States of Matter; Liquids and Solids
3 Molecular Geometry and Chemical Bonding Theory 1. Comparison of Gases, Liquids, and Solids Changes of State 2. Phase Transitions 3. Phase Diagrams Liquid State 4. Properties of Liquids; Surface Tension And Viscosity 5. Intermolecular Forces; Explaining Liquids Properties Solid State 6. Classification of Solids by Type of Attraction of Units 7. Crystalline Solids; Crystal Lattices and Unit Cells 8. Structures of Some Crystalline Solids 9. Calculations Involving Unit-Cell Dimensions

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20071019 Day Lecture 17 Chapter 11 - Todays Plan Welcome to...

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