Molecular Geometry

Monday: molecular geometry lab

Announcements/Reminders

Agenda:

​

• Phones up!

• Sign in and out when leaving the room

• Wed 10/30 Lab quiz-molecular models lab

• Thursday 10/31 test review due

• Friday 11/1- Unit 4 Bonding test

• announcements

• molecular geometry lab pg 109​

• pages 105-107

Bellwork:

1) DO NOT touch the model kits!
2) Fill in column 1 on pg 109, then 2-4
3 )practice on pages 105-107​​

Homework:

1) work on pages 105-107 (answer key on GC)
2) edpuzzle due tomorrow
3) molecular model lab pg 109 due Wed by 11:59pm
​​

Multiple Choice

What is the shape of an ionic compound?

• trigonal pyrimidal

• linear

• crystal lattice

• amorphous

Poll

How are you feeling about lewis structures?

• I can draw them

• I remember the rules but have trouble drawing them. 

• Who is Lewis and how did he get a structure?

Electron geometry vs molecular geometry

Electron geometry is based on the # of electron regions (groups, domains, also known as "steric #")

Molecular geometry is determined by # of regions that are bonded as compared to lone pairs

Multiple Choice

Three pairs of electrons are shared in a

• Single bond
• Double bond
• Triple bond

Multiple Choice

NH₃ has how many lone pairs?

• 0

• 1

• 2

• 3

Multiple Choice

How many electron regions does CH₄ contain?

• 1

• 2

• 3

• 4

Multiple Choice

Which molecule will have trigonal planar geometry?

Multiple Choice

A molecule with 2 bonding pairs could have linear or bent geometry. What will cause the change in geometry?

• The addition of a lone pair of electrons to the central atom

• The reduction the the number of bonding pairs

• The addition of bonding pairs

• Not sure!

Multiple Choice

True or false: Water will have bent molecular geometry and bent electron geometry.

• True

• False

Explanation Slide...

The molecular geometry of water is bent.The electron geometry is tetrahedral due to the two lone pairs and 2 bonding pairs.(4 electron domains)

Multiple Choice

4. Which of the following contains an atom (other than hydrogen) which lacks an octet of valence electrons?

• NH₃

• H₃O⁺

• BH₃

• NH₄⁺

​Molecular geometry lab pg 109

​Picture of data table is due on GC by 11:59 PM on 10/30

DO NOT throw or lose ​the atoms to the kits