Test 3

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

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Jaedyn_Birchmier3F
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Test 3

Postby Jaedyn_Birchmier3F » Sun Nov 25, 2018 4:00 pm

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.

Hedi Zappacosta 1E
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Re: Test 3

Postby Hedi Zappacosta 1E » Sun Nov 25, 2018 4:02 pm

I think so. Everything we've learned after the material that was on the midterm.

Katie Sy 1L
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Re: Test 3

Postby Katie Sy 1L » Sun Nov 25, 2018 4:21 pm

i believe so and possibly some past topics may be included but i'm not sure about that

DavidEcheverri3J
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Re: Test 3

Postby DavidEcheverri3J » Sun Nov 25, 2018 4:59 pm

Will we also need to know the degrees of the shapes?

alanaarchbold
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Re: Test 3

Postby alanaarchbold » Sun Nov 25, 2018 5:02 pm

I think we need to be able to identify shapes so we might have to know the bond angles

Emily Li 4A
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Re: Test 3

Postby Emily Li 4A » Sun Nov 25, 2018 5:21 pm

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.

becca_vandyke_4b
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Re: Test 3

Postby becca_vandyke_4b » Sun Nov 25, 2018 5:23 pm

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.

Sarah Bui 2L
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Re: Test 3

Postby Sarah Bui 2L » Sun Nov 25, 2018 9:16 pm

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.

Hanlin Zhu 4G
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Re: Test 3

Postby Hanlin Zhu 4G » Sun Nov 25, 2018 9:19 pm

I think different intermolecular interactions is also included in the test.

Sona Hakobyan 3J
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Re: Test 3

Postby Sona Hakobyan 3J » Sun Nov 25, 2018 9:29 pm

Hanlin Zhu 4G wrote:I think different intermolecular interactions is also included in the test.

Can you elaborate on this?

405021651
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Re: Test 3

Postby 405021651 » Sun Nov 25, 2018 9:30 pm

Will it be only topics on outline 3?

805169754
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Re: Test 3

Postby 805169754 » Sun Nov 25, 2018 9:43 pm

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

Ethan Yi 1K
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Re: Test 3

Postby Ethan Yi 1K » Sun Nov 25, 2018 9:50 pm

so is the test only on the things we learned after the last midterm?

kateminden
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Re: Test 3

Postby kateminden » Sun Nov 25, 2018 9:53 pm

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)."

Hanlin Zhu 4G
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Re: Test 3

Postby Hanlin Zhu 4G » Sun Nov 25, 2018 9:54 pm

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.

Julia Lee
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Re: Test 3

Postby Julia Lee » Sun Nov 25, 2018 9:59 pm

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.

Pritish Patil 1K
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Re: Test 3

Postby Pritish Patil 1K » Sun Nov 25, 2018 10:02 pm

It says on the website to know the End of Bonding 6th(3.12), 7th(2D) and all of Molecular Shape and Structure.

Liset Rivera 3A
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Re: Test 3

Postby Liset Rivera 3A » Sun Nov 25, 2018 10:05 pm

I believe it will be because it was the only thing we have learned after the midterm.

Ariana Morales
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Re: Test 3

Postby Ariana Morales » Sun Nov 25, 2018 11:38 pm

How do we know if test 3 will be on everything we covered of far or just what's on the outline?

LG2019
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Re: Test 3

Postby LG2019 » Sun Nov 25, 2018 11:57 pm

Will test 3 cover material covered in lecture on Monday (11/26)?

Nicole Elhosni 2I
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Re: Test 3

Postby Nicole Elhosni 2I » Mon Nov 26, 2018 12:55 am

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)."

Josceline 3J
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Re: Test 3

Postby Josceline 3J » Mon Nov 26, 2018 1:00 am

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.

Nicole Elhosni 2I
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Re: Test 3

Postby Nicole Elhosni 2I » Mon Nov 26, 2018 1:04 am

I usually focus on the lectures and homework and I read if I am still confused.

505194972 3k
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Re: Test 3

Postby 505194972 3k » Mon Nov 26, 2018 1:52 am

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.

Sydney Tay 2B
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Re: Test 3

Postby Sydney Tay 2B » Mon Nov 26, 2018 4:34 am

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?

Anjali 4A
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Re: Test 3

Postby Anjali 4A » Mon Nov 26, 2018 11:38 pm

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!

Meachelle_Lum_1I
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Re: Test 3

Postby Meachelle_Lum_1I » Tue Nov 27, 2018 12:17 am

My TA said these would be the topics:
-VSEPR, Molecular Geometry, Lewis Structures
-Intermolecular Forces
-Hybridization
-Polarizability

ChemSection3I
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Re: Test 3

Postby ChemSection3I » Tue Nov 27, 2018 2:17 pm

are there any specific homework problems we should know for the test?

Sarah_Kang_2K
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Re: Test 3

Postby Sarah_Kang_2K » Tue Nov 27, 2018 3:08 pm

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

Dana Wilks 3I
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Re: Test 3

Postby Dana Wilks 3I » Tue Nov 27, 2018 5:07 pm

Does this mean that the material covered in this past Monday's lecture won't be included?

Mukil_Pari_2I
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Re: Test 3

Postby Mukil_Pari_2I » Tue Nov 27, 2018 6:12 pm

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.
Last edited by Mukil_Pari_2I on Tue Nov 27, 2018 6:12 pm, edited 1 time in total.

Veronica Soliman 4H
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Re: Test 3

Postby Veronica Soliman 4H » Tue Nov 27, 2018 6:12 pm

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.

Ashley P 4I
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Re: Test 3

Postby Ashley P 4I » Tue Nov 27, 2018 6:13 pm

Does anyone have a trick to memorizing all these things?

George Ghaly 2L
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Re: Test 3

Postby George Ghaly 2L » Tue Nov 27, 2018 8:20 pm

the best way of identifying molecular shapes is by memorizing the designated shape according to how many species and lone pairs there are

Nicolle Fernandez 1E
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Re: Test 3

Postby Nicolle Fernandez 1E » Tue Nov 27, 2018 11:23 pm

Another thing you need to know intramolecular forces like dipole-dipole and ion-ion as well as London dispersion forces

Angela Grant 1D
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Re: Test 3

Postby Angela Grant 1D » Tue Nov 27, 2018 11:25 pm

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

Ashley P 4I
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Re: Test 3

Postby Ashley P 4I » Wed Dec 05, 2018 11:13 pm

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.

Ricardo Martin 1J
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Re: Test 3

Postby Ricardo Martin 1J » Thu Dec 06, 2018 10:19 am

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.

Josceline 3J
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Re: Test 3

Postby Josceline 3J » Mon Dec 10, 2018 1:44 am

The AXE is the formula for VSEPR, no?? OMG was I reading this all wrong all along???


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