Ch. 7/8 Notes

*The notes for this chapter are organized deliberately. We will go in the following order: Lesson 44, 42, and 43. This is intended to facilitate understanding between concepts.

1 L44

Electron Density Maps

http://www.chem.ucla.edu/~harding/IGOC/E/electron_density.html

2 L42, 43 (Updated)

Illustrative Addition (10 pts) – Due date to be established

•Include some sort of infographic, cartoon, 3-D project, etc. that helps illustrate the concept of given concept. This must connect to the concepts covered in class and provide some sort of assistance to someone attempting to learn about it. This can be hand-drawn, generated electronically (it must be original), or submitted as its own entity.

*Pick either bond polarity (pg. 225) OR molecule polarity (pg. 224).

*Must include at least three (3) panels, illustrations, etc.

•5 points – The illustrative addition that you construct is scientifically correct and relevant to the current chapter’s information. (Points will be deducted depending on the degree of inaccuracy)

•2.5 points – Your model is visually appealing. You must use at least 2 colors that are not black, gray or white. Certain exceptions may apply (e.g. wooden structure); ask about these ahead of time.

•2.5 pts – Your model provides clear explanations of what it is illustrating.

Intermolecular Forces Cold Open (Short)

https://www.wisc-online.com/learn/natural-science/chemistry/gch6804/intermolecular-forces

PHET Polarity (20 pts/1 period) https://phet.colorado.edu/en/simulation/molecule-polarity

*Answer the following questions using complete sentences. Failing to do so will result in zero credit for the applicable responses. Each is worth one point apiece unless otherwise indicated.

*Group work is permitted; due date to be established

Part 1 – Two Atoms

1. Consider the bond character of the molecule. Detail one characteristic that makes a bond more covalent.

2. Consider the bond character of the molecule. Detail one characteristic that makes a bond more ionic.

3. Specifically describe the electron density of a polar molecule.

4. How does a polar molecule behave in an electric field? (Use “positive” and “negative” in your response; do not rely on the terms “left” and “right”)

5. Specifically describe the electron density of a nonpolar molecule.

6. How does a nonpolar molecule behave in an electric field? (Use “positive” and “negative” in your response; do not rely on the terms “left” and “right”)

Part 2 – Three Atoms

7. Differentiate between bond dipoles and molecular dipole.

8. Consider the questions/answers to numbers 4 and 6. Determine whether your findings are also applicable to this simulation.

9. Assume that the following description applies to a polar covalent molecule. It is recommended to adjust the molecule to fit the description (applies to parts a-c).

If atom A has a small delta positive, atom B has a medium delta positive, and atom C has a large delta negative…

(a) How will the molecule orient itself in an electric field? (Use “positive” and “negative” and/or atom A, atom B, or atom C in your response; do not rely on the terms “left” and “right”)

(b) Around which atom (A, B, or C) will the electrons spend the majority of their time?

(c) Is it accurate to say that the electrons are evenly shared, unevenly shared, or completely transferred to one atom in particular?

Reason and Apply – Complete sentences are NOT required for any of the following

10. It is possible for a nonpolar molecule to contain PC bonds. Provide an example of this including the following:

(a) A drawing of the molecule (Lewis structure, line structure, ball-and-stick model, etc.).

(b) A calculation of the ∆χ values for each of the bond types. (2 pts)

(c) A brief explanation why the molecule is nonpolar.

11. Draw a diagram or write an explanation of how to differentiate between dipole-dipole and hydrogen bonding intermolecular forces. (5 pts)

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Ch. 7/8 Exam - includes (but is not limited to) Lessons 36-44

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