Search found 33 matches

by Carolina Lechuga
Sat Dec 08, 2018 4:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Shape vs Molecular Geometry
Replies: 3
Views: 118

VSEPR Shape vs Molecular Geometry

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.
by Carolina Lechuga
Sat Dec 08, 2018 11:56 am
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent
Replies: 2
Views: 227

Ionic vs Covalent

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...
by Carolina Lechuga
Sat Dec 08, 2018 11:24 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polarizability and Polarizing Power
Replies: 3
Views: 122

Re: Polarizability and Polarizing Power

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...
by Carolina Lechuga
Fri Dec 07, 2018 11:20 am
Forum: Naming
Topic: cyano vs cyanido
Replies: 3
Views: 62

Re: cyano vs cyanido

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.
by Carolina Lechuga
Thu Dec 06, 2018 4:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 2
Views: 72

Polarity

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?
by Carolina Lechuga
Thu Dec 06, 2018 4:03 pm
Forum: Administrative Questions and Class Announcements
Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Replies: 118
Views: 5124

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

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?
by Carolina Lechuga
Thu Dec 06, 2018 3:17 pm
Forum: Administrative Questions and Class Announcements
Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Replies: 118
Views: 5124

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

These practice worksheets are my fave !! Everyone I know is going to your review session! You really clear things up.
by Carolina Lechuga
Mon Dec 03, 2018 12:57 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH and pOH
Replies: 1
Views: 40

pH and pOH

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?
by Carolina Lechuga
Mon Dec 03, 2018 12:48 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Conjugate
Replies: 2
Views: 70

Conjugate

Can someone explain to me further what the conjugate seesaw is ??
by Carolina Lechuga
Mon Dec 03, 2018 12:47 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: KB values
Replies: 1
Views: 47

KB values

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 ?
by Carolina Lechuga
Mon Nov 26, 2018 1:33 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Replies: 135
Views: 28599

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

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...
by Carolina Lechuga
Mon Nov 26, 2018 1:29 pm
Forum: Hybridization
Topic: Test 3
Replies: 13
Views: 224

Re: Test 3

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!
by Carolina Lechuga
Mon Nov 26, 2018 1:28 pm
Forum: Administrative Questions and Class Announcements
Topic: Final
Replies: 5
Views: 153

Final

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) ?
by Carolina Lechuga
Sat Nov 24, 2018 9:20 pm
Forum: Ionic & Covalent Bonds
Topic: Polarizability vs Polar Power
Replies: 1
Views: 63

Re: Polarizability vs Polar Power

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 ...
by Carolina Lechuga
Sat Nov 24, 2018 3:18 pm
Forum: Hybridization
Topic: Test 3
Replies: 13
Views: 224

Re: Test 3

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.
by Carolina Lechuga
Sat Nov 24, 2018 3:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: How to state bond angles.
Replies: 7
Views: 153

Re: How to state bond angles.

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
by Carolina Lechuga
Sat Nov 24, 2018 3:13 pm
Forum: Hybridization
Topic: Steps to figure out hybridization
Replies: 3
Views: 70

Re: Steps to figure out hybridization

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...
by Carolina Lechuga
Sat Nov 24, 2018 3:05 pm
Forum: Bond Lengths & Energies
Topic: Single, Double, Triple Bond Lengths
Replies: 5
Views: 118

Re: Single, Double, Triple Bond Lengths

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
by Carolina Lechuga
Sat Nov 24, 2018 3:04 pm
Forum: Hybridization
Topic: Octet Expansion and d-Orbitals
Replies: 8
Views: 172

Re: Octet Expansion and d-Orbitals

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
by Carolina Lechuga
Sat Nov 24, 2018 3:03 pm
Forum: Hybridization
Topic: Octet Expansion and d-Orbitals
Replies: 8
Views: 172

Re: Octet Expansion and d-Orbitals

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
by Carolina Lechuga
Sat Nov 24, 2018 2:53 pm
Forum: Hybridization
Topic: Test 3
Replies: 13
Views: 224

Test 3

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?
by Carolina Lechuga
Sun Nov 18, 2018 8:02 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lecture VSEPR
Replies: 2
Views: 82

Lecture VSEPR

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!
by Carolina Lechuga
Sun Nov 18, 2018 7:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 3
Views: 61

Re: Lone Pairs

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...
by Carolina Lechuga
Sun Nov 18, 2018 7:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Model formation
Replies: 2
Views: 52

Re: Model formation

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.
by Carolina Lechuga
Sun Nov 18, 2018 7:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Shape
Replies: 5
Views: 101

Re: Determining Shape

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.
by Carolina Lechuga
Sat Nov 17, 2018 2:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs of Electrons
Replies: 1
Views: 46

Lone Pairs of Electrons

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 )
by Carolina Lechuga
Wed Nov 14, 2018 11:59 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal planar and bent shape
Replies: 2
Views: 56

Re: Trigonal planar and bent shape

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.
by Carolina Lechuga
Wed Nov 14, 2018 11:54 am
Forum: Administrative Questions and Class Announcements
Topic: Thanksgiving week
Replies: 10
Views: 302

Thanksgiving week

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
by Carolina Lechuga
Wed Nov 14, 2018 11:50 am
Forum: Administrative Questions and Class Announcements
Topic: Octet Rule
Replies: 6
Views: 176

Octet Rule

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??
by Carolina Lechuga
Wed Nov 14, 2018 11:44 am
Forum: Student Social/Study Group
Topic: Test 3
Replies: 6
Views: 388

Test 3

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?
by Carolina Lechuga
Sat Nov 03, 2018 10:49 am
Forum: Ionic & Covalent Bonds
Topic: 3.23 6th Edition
Replies: 3
Views: 44

Re: 3.23 6th Edition

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...
by Carolina Lechuga
Thu Oct 18, 2018 11:17 pm
Forum: Administrative Questions and Class Announcements
Topic: Required knowledge for test/midterm [ENDORSED]
Replies: 13
Views: 309

homework [ENDORSED]

For the homework, is there homework due when we have tests, or do we turn it in on Friday or the following discussion?
by Carolina Lechuga
Wed Oct 17, 2018 12:09 pm
Forum: Administrative Questions and Class Announcements
Topic: Required knowledge for test/midterm [ENDORSED]
Replies: 13
Views: 309

Grade [ENDORSED]

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?

Go to advanced search