Loading in 5 sec....

Honors Chemistry Chapter 8.1 notesPowerPoint Presentation

Honors Chemistry Chapter 8.1 notes

- 133 Views
- Uploaded on

Download Presentation
## PowerPoint Slideshow about ' Honors Chemistry Chapter 8.1 notes' - jillian-adriano

**An Image/Link below is provided (as is) to download presentation**

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript

Honors ChemistryChapter 8.1 notes

“The Shapes of Small Molecules”

Legos:Does this bring back any good memories???

I. Molecular Geometry

- A. Structural Formula
- 1. Ex: Ammonia NH3
- 2. Boring, 2 Dimensional…
- B. Ball and Stick Model
1. Def – Ball represents atom’s nucleus and inner electrons. Sticks represent bonds between atoms.

2. 3-Dimensional!

3. Shapes are symmetrical.

a. Equal distance separating atoms

- b. Why?
- *electrons repel other electrons to form symmetry
- 4. VSEPR Theory
- a. Valence-shell electron pair repulsion theory
- b. Def – in a small molecule, the pairs of electrons are arranged as far apart from each other as possible.
- *Note: this does not apply in all situations!
- Ex: transition metals

II. Molecular GeometryContinued…

- Linear
- 1. Def – straight line angles (180°)
- 2. Ex: O2, HCl, CO2

- Trigonal Planer
- 1. Def – Triangular and flat (120°)
- 2. Ex: BCl3,
- 3. Usually 1 central atom

- C. Tetrahedral
- 1. Def – means shape with 4 surfaces (109.5°)
- 2. Ex: CH4
- 3. Angle is not 90°! (Fig 8-7)

- Pyramidal or Trigonal Pyramidal
- 1. Def – 3 corners with 1 pair of unshared electrons
- 2. Bond Angle = 107°
- 3. why? Unpaired electrons take up more room.
- 4. Ex: NH3

- Bent
- 1. Def – Not linear !
- 2. Bond Angle = 105°
- 3. Ex: H2O

- Others…
- 1. T-shaped ClF3
- 2. Square Planar XeF4
- 3. TrigonalBipyramidal PF5
- 4. Octahedral SF6

8.1 assignment

- Identify the following molecular shapes and bond angles:
a. H2O

b. CF4

c. NCl3

d. CO2

e. NF3

f. BF3

g. HCN

h. NO3

Bent – 105

Tetrahedral – 109.5

Trigonal pyramidal – 107

Linear – 180

Trigonal pyramidal – 107

Trigonal Planer – 120

Linear – 180

Trigonal Planer – 120

Download Presentation

Connecting to Server..