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Test 3

Posted: Sun Nov 25, 2018 4:00 pm
by Jaedyn_Birchmier3F
I was just wondering if the only topics on test 3 are going to be VSEPR and hybridization. These seem to be the only two concepts covered in the Lavelle's lectures.

Re: Test 3

Posted: Sun Nov 25, 2018 4:02 pm
by Hedi Zappacosta 1E
I think so. Everything we've learned after the material that was on the midterm.

Re: Test 3

Posted: Sun Nov 25, 2018 4:21 pm
by Katie Sy 1L
i believe so and possibly some past topics may be included but i'm not sure about that

Re: Test 3

Posted: Sun Nov 25, 2018 4:59 pm
by DavidEcheverri3J
Will we also need to know the degrees of the shapes?

Re: Test 3

Posted: Sun Nov 25, 2018 5:02 pm
by alanaarchbold
I think we need to be able to identify shapes so we might have to know the bond angles

Re: Test 3

Posted: Sun Nov 25, 2018 5:21 pm
by Emily Li 4A
DavidEcheverri3J wrote:Will we also need to know the degrees of the shapes?


I think it's very likely that we have to know them, but at least we can use simple math to find angles in most of the shapes.

Re: Test 3

Posted: Sun Nov 25, 2018 5:23 pm
by becca_vandyke_4b
I thought he said that we will not need to know bond angle. That we will be asked to draw the Lewis Structure and then name the shape.

Re: Test 3

Posted: Sun Nov 25, 2018 9:16 pm
by Sarah Bui 2L
becca_vandyke_4b wrote:I thought he said that we will not need to know bond angle. That we will be asked to draw the Lewis Structure and then name the shape.



I think he doesn't expect us to know the exact bond angle (like 107)' but we should know and write it as less than 109.5' for something like the trigonal pyramid shape.

Re: Test 3

Posted: Sun Nov 25, 2018 9:19 pm
by Hanlin Zhu 4G
I think different intermolecular interactions is also included in the test.

Re: Test 3

Posted: Sun Nov 25, 2018 9:29 pm
by Sona Hakobyan 3J
Hanlin Zhu 4G wrote:I think different intermolecular interactions is also included in the test.

Can you elaborate on this?

Re: Test 3

Posted: Sun Nov 25, 2018 9:30 pm
by 405021651
Will it be only topics on outline 3?

Re: Test 3

Posted: Sun Nov 25, 2018 9:43 pm
by 805169754
405021651 wrote:Will it be only topics on outline 3?
I think the test would also include topics from outline 4 which is about VSEPR and hybridization

Re: Test 3

Posted: Sun Nov 25, 2018 9:50 pm
by Ethan Yi 1K
so is the test only on the things we learned after the last midterm?

Re: Test 3

Posted: Sun Nov 25, 2018 9:53 pm
by kateminden
Ethan Yi 4E wrote:so is the test only on the things we learned after the last midterm?


Hi! Dr. Lavelle posted this announcement on his website: "Test 3 covers: End of Bonding from 3.12 (6 Ed.) and from 2D (7 Ed.); and all of Molecular Shape and Structure (see Syllabus and Outlines for details)."

Re: Test 3

Posted: Sun Nov 25, 2018 9:54 pm
by Hanlin Zhu 4G
I think the comparative strength of ion-ion, ion-dipole, dipole-dipole, dipole-induced dipole, and dispersion interactions may also on the test. Also I remember there are specific factors affecting induced dipole-induced dipole forces.

Re: Test 3

Posted: Sun Nov 25, 2018 9:59 pm
by Julia Lee
I believe intermolecular interactions, bond strengths & lengths, VSEPR, molecular shape & structure, sigma & pi bonds, and hybridization are all the topics that are going to be covered on test 3.

Re: Test 3

Posted: Sun Nov 25, 2018 10:02 pm
by Pritish Patil 1K
It says on the website to know the End of Bonding 6th(3.12), 7th(2D) and all of Molecular Shape and Structure.

Re: Test 3

Posted: Sun Nov 25, 2018 10:05 pm
by Liset Rivera 3A
I believe it will be because it was the only thing we have learned after the midterm.

Re: Test 3

Posted: Sun Nov 25, 2018 11:38 pm
by Ariana Morales
How do we know if test 3 will be on everything we covered of far or just what's on the outline?

Re: Test 3

Posted: Sun Nov 25, 2018 11:57 pm
by LG2019
Will test 3 cover material covered in lecture on Monday (11/26)?

Re: Test 3

Posted: Mon Nov 26, 2018 12:55 am
by Nicole Elhosni 2I
On the chem portal, it says "Test 3 covers: End of Bonding from 3.12 (6 Ed.) and from 2D (7 Ed.); and all of Molecular Shape and Structure (see Syllabus and Outlines for details)."

Re: Test 3

Posted: Mon Nov 26, 2018 1:00 am
by Josceline 3J
for test 3 should we go about to study (the book) chapter 4 on molecular structures and shapes or should we focus on studying what the lectures are about? Since the test is supposed to be similar to the homework problems.

Re: Test 3

Posted: Mon Nov 26, 2018 1:04 am
by Nicole Elhosni 2I
I usually focus on the lectures and homework and I read if I am still confused.

Re: Test 3

Posted: Mon Nov 26, 2018 1:52 am
by 505194972 3k
Josceline 3J wrote:for test 3 should we go about to study (the book) chapter 4 on molecular structures and shapes or should we focus on studying what the lectures are about? Since the test is supposed to be similar to the homework problems.

Professor Lavelle often stresses that it is most helpful to do the homework problems to prepare for a test so I would do as many of them as you can and review lecture notes to be sure you understand key concepts.

Re: Test 3

Posted: Mon Nov 26, 2018 4:34 am
by Sydney Tay 2B
I believe we will need to know the basic angles of the more common shapes, like a tetrahedral has angles of 109.5. I don't think he will make use memorize all bond angles when there are lone pairs involved. I just think that we need to know that a lone pair causes greater repulsion and the bond angle of the subsequent atoms will decrease.

DavidEcheverri3J wrote:Will we also need to know the degrees of the shapes?

Re: Test 3

Posted: Mon Nov 26, 2018 11:38 pm
by Anjali 4A
We should revise everything covered on the outline Dr. Lavelle gave, and I find that revising lecture notes and doing as many problems as I can helps the most!

Re: Test 3

Posted: Tue Nov 27, 2018 12:17 am
by Meachelle_Lum_1I
My TA said these would be the topics:
-VSEPR, Molecular Geometry, Lewis Structures
-Intermolecular Forces
-Hybridization
-Polarizability

Re: Test 3

Posted: Tue Nov 27, 2018 2:17 pm
by ChemSection3I
are there any specific homework problems we should know for the test?

Re: Test 3

Posted: Tue Nov 27, 2018 3:08 pm
by Sarah_Kang_2K
Hi guys.
What do we need to know about Acids and Bases for Test 3?

Re: Test 3

Posted: Tue Nov 27, 2018 5:07 pm
by Dana Wilks 3I
Does this mean that the material covered in this past Monday's lecture won't be included?

Re: Test 3

Posted: Tue Nov 27, 2018 6:12 pm
by Mukil_Pari_2I
Dana Wilks 3I wrote:Does this mean that the material covered in this past Monday's lecture won't be included?

No it as stated on Dr. Lavelle's website, the test will only cover 3.12-3.16, 6.4-6.5, and 4.1-4.7 which do not include Monday's lecture.

Sarah_Kang_3K wrote:Hi guys.
What do we need to know about Acids and Bases for Test 3?

Need to know what lewis acids and lewis bases are--lewis acids accept electrons and lewis bases donate electrons.

Re: Test 3

Posted: Tue Nov 27, 2018 6:12 pm
by Veronica Soliman 4H
Emily Li 4A wrote:
DavidEcheverri3J wrote:Will we also need to know the degrees of the shapes?


I think it's very likely that we have to know them, but at least we can use simple math to find angles in most of the shapes.


I think it's helpful to know the molecular structure, electron structure, angles, and the way it looks.

Re: Test 3

Posted: Tue Nov 27, 2018 6:13 pm
by Ashley P 4I
Does anyone have a trick to memorizing all these things?

Re: Test 3

Posted: Tue Nov 27, 2018 8:20 pm
by George Ghaly 2L
the best way of identifying molecular shapes is by memorizing the designated shape according to how many species and lone pairs there are

Re: Test 3

Posted: Tue Nov 27, 2018 11:23 pm
by Nicolle Fernandez 1E
Another thing you need to know intramolecular forces like dipole-dipole and ion-ion as well as London dispersion forces

Re: Test 3

Posted: Tue Nov 27, 2018 11:25 pm
by Angela Grant 1D
Ashley P 4I wrote:Does anyone have a trick to memorizing all these things?


I made a big chart to study off of, you can find one online if you just search up VSEPR geometries

Re: Test 3

Posted: Wed Dec 05, 2018 11:13 pm
by Ashley P 4I
Angela Grant 3G wrote:
Ashley P 4I wrote:Does anyone have a trick to memorizing all these things?


I made a big chart to study off of, you can find one online if you just search up VSEPR geometries


Thank you so much! I ended up making flash cards as well.

Re: Test 3

Posted: Thu Dec 06, 2018 10:19 am
by Ricardo Martin 1J
A trick I found helpful is memorizing the VSEPR equations such as AX3E2 and knowing what shape corresponds to those equations because as soon as you drew the Lewis Structure you could conclude the VSEPR equation and therefore concluding the shape. This also helps with knowing the hybridization.

Re: Test 3

Posted: Mon Dec 10, 2018 1:44 am
by Josceline 3J
The AXE is the formula for VSEPR, no?? OMG was I reading this all wrong all along???