Page 1 of 1

Molecular Shape Name

Posted: Wed Nov 13, 2019 11:47 am
by Ying Yan 1F
Is it necessary to remember the names of all the molecular shapes? I know linear, triangular planarm, tetrahedral are very common molecular shapes so it's good to remember them, but what about the other shapes such as trigonal bipyramidal, square pyramidal, etc.? Thank you!

Re: Molecular Shape Name

Posted: Wed Nov 13, 2019 12:15 pm
by Angela Patel 2J
I think you should try to remember all of them since it will help you remember how the structure looks. It's probably not 100% necessary, but it would be helpful.

Re: Molecular Shape Name

Posted: Wed Nov 13, 2019 12:41 pm
by KMenjivar_3A
I recommend to learn all the other shapes, including the ones that contain lone pairs.

Re: Molecular Shape Name

Posted: Wed Nov 13, 2019 12:49 pm
by SMIYAZAKI_1B
I would agree with the other students and say that it would definitely help you to understand all of the shape names and also try to remember the bond angles. At least on the midterm, we did have a molecule with more than 8 valence electrons in the valence shell.

Re: Molecular Shape Name

Posted: Wed Nov 13, 2019 1:54 pm
by Katherine Chhen 3I
Would there be an easier way to memorize all the shape names or how to determine which molecule has what shape?

Re: Molecular Shape Name

Posted: Wed Nov 13, 2019 1:58 pm
by Kate Osborne 1H
I think it's necessary to learn the names for all the shapes that Dr. Lavelle talks about in lecture. I found it easiest to memorize when I looked at all shapes that have the same number of electron domains and memorized them in decreasing bonding domain order.

Re: Molecular Shape Name

Posted: Wed Nov 13, 2019 10:21 pm
by derinceltik1K
It's definitely important to know the geometric names. They are the whole point with VSEPR. And Dr. Lavelle mentioned certain details that we don't need to know like the diagrams where it shows which part of the molecule is closer and which atoms are in the back .
But the shape, name and the angle we are expected to know.

Re: Molecular Shape Name

Posted: Thu Nov 14, 2019 3:28 pm
by ABombino_2J
Yes, you should know the shape names as well as the bonding angles. These are easiest to memorize when you look at them in terms of total bonding regions as opposed to individually. You do not need to know how to draw the structure in 3d space, only the lewis structures; 3d will be reserved for organic chem. However, understanding the structure in 3d space will help understand why the bond angles are what they are.

Re: Molecular Shape Name

Posted: Thu Nov 14, 2019 4:08 pm
by Claire Grover 3G
My TA said that we have to know all of them, and how to predict which shapes various molecules will be.

Re: Molecular Shape Name

Posted: Thu Nov 14, 2019 4:12 pm
by Bryce Barbee
I think that we probably just have to know the ones that were said in lecture.

Re: Molecular Shape Name

Posted: Thu Nov 14, 2019 5:44 pm
by AprilPaz
It would be helpful to be familiar with all names not just the most common.

Re: Molecular Shape Name

Posted: Thu Nov 14, 2019 7:45 pm
by Michelle Xie 2B
I think we will need to know most of the names.

Re: Molecular Shape Name

Posted: Thu Nov 14, 2019 8:11 pm
by bellaha4F
Knowing all of them will be the best I think, test-wise

Re: Molecular Shape Name

Posted: Thu Nov 14, 2019 8:28 pm
by Jade Hinds 2B
We can all agree that based upon what we've recently learned in lecture, VSEPR and molecular shape naming is basically all that will be on test 2!

Re: Molecular Shape Name

Posted: Thu Nov 14, 2019 9:22 pm
by andrewcj 2C
Some shapes come from others, so it might not be necessary to explicitly memorize every shape. For example, bent comes from a tetrahedral shape with 2 lone pairs, but you don't have have to necessarily memorize bent. Instead, just think about a tetrahedral shape and remove 2 atoms.

Re: Molecular Shape Name

Posted: Thu Nov 14, 2019 9:34 pm
by Jorge Ramirez_4H
What's the difference between linear and I think it was bent?

Re: Molecular Shape Name

Posted: Thu Nov 14, 2019 10:00 pm
by AKatukota
It is helpful to remember the shape names as well as bond angles.

Re: Molecular Shape Name

Posted: Thu Nov 14, 2019 10:05 pm
by Michelle Le 1J
Jorge Ramirez_4H wrote:What's the difference between linear and I think it was bent?

The difference between the two is their bond angles, with linear it's 180, while with bent it's about 109.5.