(Polar molecules, Non-polar molecules, etc.)

Moderators: Chem_Mod, Chem_Admin

Posts: 98
Joined: Sun Sep 15, 2019 12:15 am


Postby Andrea_Torres » Sun Nov 17, 2019 6:25 pm

How is the VSEPR model used in determining shape? Is it also used in finding the angles?

Posts: 55
Joined: Fri Aug 30, 2019 12:16 am


Postby DTingey_1C » Sun Nov 17, 2019 6:33 pm

He explained in class that we do not need to know the exact angles in the model, but we should know how the radii of atoms and other factors might impact the angles. Hope this helps.

Petrina Kan 2I
Posts: 102
Joined: Fri Aug 30, 2019 12:17 am


Postby Petrina Kan 2I » Sun Nov 17, 2019 7:36 pm

The shape is always determined by the number of bonding pairs and lone pairs for the VSEPR model. And then once we determine the shape based on those things, we can also see the bond angles according to that shape.

Posts: 71
Joined: Sat Aug 24, 2019 12:16 am


Postby ZainAlrawi_1J » Sun Nov 17, 2019 7:52 pm

The number of bonding pairs and lone pairs attached to a central atom determines its shape, I would recommend looking up a VSEPR chart as it shows how intuitive it is.

erica thompson 4I
Posts: 55
Joined: Wed Sep 18, 2019 12:21 am


Postby erica thompson 4I » Sun Nov 17, 2019 7:56 pm

Use the VSEPR formula to determine the number of atoms and lone pairs in a molecule. Add up the Xs and the Es to determine the structure of the electrons (e.g. tetrahedral, octahedral, etc.), then remove as many atoms as there are Es to find the actual molecular shape. For example, tetrahedral molecular structures will always correspond to VSEPR formula AX4.

Posts: 109
Joined: Thu Jul 11, 2019 12:17 am
Been upvoted: 1 time


Postby Vivianvelazquez_1J » Sun Nov 17, 2019 8:02 pm

You will not need to know the exact angles of the models, you will only need to know the shape of the model. the VSEPR model has a specific notation that can help you figure the shape of the model. If you look up a VSEPR chart you can easily distinguish the shapes from the different models using the VSEPR notation.

VSEPR model notation:
A= central atom
X= bonded pair
E= lone pair

If you can find the VSEPR model notation it will be easier to find the shape.

Return to “Determining Molecular Shape (VSEPR)”

Who is online

Users browsing this forum: No registered users and 3 guests