CHEMISTRY COMMUNITY

Carolina Lechuga

On the exam, how would we know whether to give the VSEPR name aka (linear, trigonal planar, tetrahedral, trigonal bipyramidal or octahedral) or the molecular geometry aka (bent, trigonal pyramidal, seesaw, T-shape). What specific words indicate which name they want.

Carolina Lechuga

During lecture we were told that if the electronegativity difference was greater than 2 then it was and ionic bond but if it was less than 1.5, it was a covalent bond. However, in my discussion we were told that if it was <0.4 it was covalent, between 0.4 and 1.8 was polar covalent, and greater than...

Carolina Lechuga

Polarizability is how easy it is to move/pull the cloud, therefore the bigger it is, the easier it is to distort it. Polarizing power is how good an atom is at pulling on bonding electrons, so the smaller it is the more polarizing power it has. You can also see which one is more positively charged a...

Carolina Lechuga

Cyanido is the "newer term" of cyano, so basically they are the same thing, you will see both but they mean the same thing. Similar to how you can use either chloro or chlorido, you just pick one and stick to it so don't use them both at the same time.

Carolina Lechuga

How do we determine a molecule's polarity by looking at it's VSEPR formula? I know we can draw it out but is there an easier way?

Carolina Lechuga

Can anyone help me with the bond angle for number one ?? I have difficulty determining bond angles so for this problem what would it be and why?

Carolina Lechuga

These practice worksheets are my fave !! Everyone I know is going to your review session! You really clear things up.

Carolina Lechuga

He said in lecture that we will mainly use pH, does this mean calculating pOH won't be on the final ? Or will calculating both still be included on the final?

Carolina Lechuga

Can someone explain to me further what the conjugate seesaw is ??

Carolina Lechuga

In class today we didn't really go over KB values, mainly KA values, will he cover that Wednesday or are we just suppose to rely on the textbook's information on this ?

Carolina Lechuga

Is there any worksheet for test 3? I believe worksheet 6 and 7 help with test 3 since it has the material that the test is going to cover but she said she won't be giving a specific worksheet for test 3 since the past 2 are enough. These worksheets are really helpful and if you scroll up, they're e...

Carolina Lechuga

Manas Jinka wrote:The test covers everything up to Monday's lecture even if your discussion is on Tuesday.

Just wanted to clear things up! Since in the past he has put material on the test from the lecture on Monday so now I know to study up to Monday lecture ! Thanks!

Carolina Lechuga

Does anyone know when our last day if instruction is ? I tried looking on the syllabus but couldn't find it. Do we end instruction at the end of next week? I know week 11 is finals week so I was wondering if we're still going to be learning up to dec 9 (our final) ?

Carolina Lechuga

Polarizability is how easy it is to pull its e- and polarizing power is how good an atom is at pulling on bonding electrons. For polarizing power, you would look at which has a smaller nucleus, which has a greater positive charge and which is more electronegative. For polarizability, you would look ...

Carolina Lechuga

404905747 wrote:Is he done teaching the material for the test? Or will we learn more of the stuff on the test on Monday?

Im wondering this too because in the past he has put questions having to do with the lecture, the day before the test. I have my TA discussion Tuesday so its super early in the week.

Carolina Lechuga

You can put slightly less than 109.5 degrees, Lavelle has said he does not expect us to know the exact degree but rather know that it is less than

Carolina Lechuga

In most cases you do have to draw the lewis structure to figure out hybridization but in my discussion, my TA told us that some elements you can figure it out just by looking at the element you are given, for example C2H4, you know that there will be a total of 3 bonds and when there are 3 bond pair...

Carolina Lechuga

single bonds have the longest bond length and therefore the weakest bond, double bond is next and triple bond has the shortest bond length and therefore the strongest

Carolina Lechuga

Aren't there some elements in the third row and below that can't have an octet expansion due to an exception? Im really confused on those

Carolina Lechuga

Aren't there some elements in the third row and below that can't have an octet expansion due to an exception? Im really confused on those

Carolina Lechuga

Does anyone know from what lecture to what lecture the test will be on, is it from the lecture after the midterm to the last one before thanksgiving break?

Carolina Lechuga

Hey, so on November 15, Lavelle said in his lecture that "VSEPR models can predict distortions qualitatively but not quantitatively" what exactly does this mean ? I have class during his office hours so if anyone can explain that would be great!

Carolina Lechuga

When you have a lone pair, it causes repulsion and it makes the bonded pairs want to get closer together which decreases the degree of the angle, also Lavelle has said he doesn't expect us to know the exact degree of the angle, as long as we know its less than the original shape, for example trigona...

Carolina Lechuga

I don't think so since you have different amounts of lone pairs and bonded pairs around the central atom, this changes the Lewis structure since the way you would format it would have to abide by how much repulsion and stabilization the model has.

Carolina Lechuga

Yes, because the more sets of lone pairs you have, the more the shape changes since lone pairs cause a bigger amount of repulsion which ends up affecting the degree of the angle as well.

Carolina Lechuga

How can we tell if there must be, may be or cannot be one or more lone pairs of electrons on the central atom? ( questions 4.1 and 4.2 in the 6th edition textbook )

Carolina Lechuga

we learned this in my discussion and according to my TA, trigonal-planar doesn't have a lone pair so the answer should be angular/bent. Im not sure why the book says that.

Carolina Lechuga

Lavelle hasn't mentioned anything about class on Wednesday? Does anyone know when he will reveal if we do have class or not ? Im trying to get my thanksgiving plans in order. Thanks

Carolina Lechuga

Hey, so my TA told us that following the octet rule is more important than getting a low formal charge. This is one of the biggest mistakes I did on the midterm so what exactly are the exceptions to the octet rule??

Carolina Lechuga

Hey y'all I know it's super early to be talking about this but I'm very confused as to what the next test may consist of? Will Lavelle post something about it when it gets closer?

Carolina Lechuga

I don't get the last 2 parts of this question. 3.23 Chlorine can exist in both positive and negative oxidation states. What is the maximum (a) positive and (b) negative oxidation number that chlorine can have? (c) Write the electron configuration for each of these states. (d) Explain how you arrived...

Carolina Lechuga

For the homework, is there homework due when we have tests, or do we turn it in on Friday or the following discussion?

Carolina Lechuga

hey, so if I didn't do too well on the first test and I mean not well at all, will getting good scores on the next tests improve my grade?

CHEMISTRY COMMUNITY

Search found 33 matches

VSEPR Shape vs Molecular Geometry

Ionic vs Covalent

Re: Polarizability and Polarizing Power

Re: cyano vs cyanido

Polarity

Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]

Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]

pH and pOH

Conjugate

KB values

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]

Re: Test 3

Final

Re: Polarizability vs Polar Power

Re: Test 3

Re: How to state bond angles.

Re: Steps to figure out hybridization

Re: Single, Double, Triple Bond Lengths

Re: Octet Expansion and d-Orbitals

Re: Octet Expansion and d-Orbitals

Test 3

Lecture VSEPR

Re: Lone Pairs

Re: Model formation

Re: Determining Shape

Lone Pairs of Electrons

Re: Trigonal planar and bent shape

Thanksgiving week

Octet Rule

Test 3

Re: 3.23 6th Edition

homework [ENDORSED]

Grade [ENDORSED]