To Do
7th HW assignment due Friday, April 10th by 10 pm.
Quiz #5 on Friday, April 10 in Discussion.
Continue reading Chapter 8 and doing the suggested homework.
1
Exam #2 High score: 75/80
Lon-Capa percentages are decreasing.
#18: homework question (chapter 7, #116).
The sum of the points so far is about 40% of the total possible points for the semester.
2
Overall Goal: PropertiesFor example, why is water a liquid but methane a gas?
To understand properties, we need to know molecular structure, which means we need to understand bonding, which is why we studied atomic structure.
3
Chemical Bond
Force that holds groups of two or more atoms together and makes them function as a unit.
Atoms will bond if the molecule is more stable than the two separated atoms (lower energy state).
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Ionic Bonding
5
Clicker Question
Consider different “sodium particles” (atom or ions) in separate evacuated containers. Which of the following sodium species is lowest in energy?
a) Na b) Na+ c) Na2+ d) Na e) Na2
6
Clicker Question
Consider different “oxygen particles” (atom or ions) in separate evacuated containers. Which of the following oxygen species is lowest in energy?
a) O b) O+ c) O2+ d) O e) O2
7
Clicker Question
Consider different “oxygen particles” (atom or ions) in separate evacuated containers. Which of the following oxygen species is second lowest in energy?
a) O b) O+ c) O2+ d) O e) O2
8
Elements/Ions Do Not “Want” To Lose Electrons!
9
Electron Affinity
10
Clicker Question
Consider different “sodium particles” (atom or ions) in separate evacuated containers. Which of the following sodium species is lowest in energy?
a) Na b) Na+ c) Na2+ d) Na e) Na2
11
Clicker Question
Consider different “oxygen particles” (atom or ions) in separate evacuated containers. Which of the following oxygen species is lowest in energy?
a) O b) O+ c) O2+ d) O e) O2
12
Clicker Question
Consider different “oxygen particles” (atom or ions) in separate evacuated containers. Which of the following oxygen species is second lowest in energy?
a) O b) O+ c) O2+ d) O e) O2
13
Elements/Ions Do Not “Want” To Lose Electrons!
14
15
16
A Covalent Bond
17
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