Search found 29 matches
- Thu Dec 06, 2018 10:40 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent Structures
- Replies: 12
- Views: 1320
Re: Bent Structures
I believe it is appropriate to saw all bent structures are polar due to their shape. There will always be a net electronegativity pointing in one direction since they cannot cancel each other due to the bond angle.
- Thu Dec 06, 2018 10:38 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: AX3E
- Replies: 18
- Views: 3303
Re: AX3E
Because of the lone pair, AX3E would be trigonal pyramidal and not tetrahedral.
- Thu Dec 06, 2018 10:36 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Notation
- Replies: 10
- Views: 1237
Re: VSEPR Notation
Recognizing the VSEPR formula is very helpful for naming the shapes of each molecule so I would recommend learning these. I'm sure this will pop up on the final so you should probably get used to giving the AXE(formula), bond angles, and shape for each molecule given.
- Sat Dec 01, 2018 1:51 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam
- Replies: 22
- Views: 1713
Re: Final Exam
The final is cumulative, Dr. Lavelle said it will cover everything on the syllabus.
- Sat Dec 01, 2018 1:46 pm
- Forum: Hybridization
- Topic: Difference between hybridization and hybrid orbitals
- Replies: 4
- Views: 755
Re: Difference between hybridization and hybrid orbitals
hybrid orbitals are orbitals created by the combination of atomic orbitals in the same atom. Hybridization happens when atomic orbitals mix to form a new atomic orbital.
- Fri Nov 23, 2018 1:07 am
- Forum: Administrative Questions and Class Announcements
- Topic: Test 3 Question
- Replies: 4
- Views: 523
Re: Test 3 Question
on the website, Dr. Lavelle does outline what is on every test so check out the syllabus for the topics for each test!
- Fri Nov 23, 2018 1:05 am
- Forum: Dipole Moments
- Topic: Canceling?
- Replies: 3
- Views: 409
Re: Canceling?
yes, the dipole vectors can cancel eachother which causes the molecule to be nonpolar.
- Fri Nov 23, 2018 1:03 am
- Forum: Dipole Moments
- Topic: Chemistry Community
- Replies: 5
- Views: 499
Re: Chemistry Community
You can get points for creating your own question, replying to other questions, and asking a question on another thread
- Fri Nov 16, 2018 9:57 am
- Forum: Administrative Questions and Class Announcements
- Topic: 14B Co-Requisites
- Replies: 4
- Views: 808
Re: 14B Co-Requisites
I know with writing classes, if you don’t fufill the prerequisites, Myucla doesn’t even allow you to enroll in the course. I’m not sure how it is for math and chem but maybe you could talk to lavelle and see if that would be acceptable. If you have AP credit for math that might also get you out of m...
- Fri Nov 16, 2018 9:54 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Linear Shape of O2
- Replies: 4
- Views: 1202
Re: Linear Shape of O2
Because the oxygen molecule has 2 oxygen molecules that are stuck together so they are non polar. They can’t have a dipole moment because they have the same electronegativity.
- Fri Nov 16, 2018 9:49 am
- Forum: Administrative Questions and Class Announcements
- Topic: Homework Due Week 7
- Replies: 10
- Views: 1228
Re: Homework Due Week 7
We can do homework from 3 and 4 because those are still the relavent topics. I believe they are also both on the test.
- Fri Nov 09, 2018 9:49 am
- Forum: Dipole Moments
- Topic: HCl
- Replies: 6
- Views: 588
Re: HCl
Chlorine is electronegative and H gives it an electron, making it slightly more positive and thus chlorine is more negative, creating a dipole moment
- Fri Nov 09, 2018 9:46 am
- Forum: Electronegativity
- Topic: electronegativity trends
- Replies: 6
- Views: 653
Re: electronegativity trends
across the period, the nuclear charge and ability of the atom to pull electrons increases. As you go down, the atoms attract electrons less.
- Fri Nov 09, 2018 9:41 am
- Forum: Bond Lengths & Energies
- Topic: MIDTERM Bond Length Question
- Replies: 15
- Views: 1613
Re: MIDTERM Bond Length Question
In discussion, our TA said they would be accepting any answer in between 120 and 140.
- Fri Nov 02, 2018 10:16 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Is electron removed from 3d or 4s first?
- Replies: 5
- Views: 48313
Re: Is electron removed from 3d or 4s first?
Electrons are first removed from the 4s orbital befofe the 3d orbital.
- Fri Nov 02, 2018 10:13 am
- Forum: Administrative Questions and Class Announcements
- Topic: Blue Book Midterm
- Replies: 4
- Views: 558
Re: Blue Book Midterm
We do not need a blue book for the midterm
- Thu Nov 01, 2018 12:23 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
- Replies: 121
- Views: 21498
Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
Thanks for the midterm practice problems!
- Tue Oct 23, 2018 5:36 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test On Tuesday
- Replies: 10
- Views: 1079
Re: Test On Tuesday
Hi, I was wondering if chapter 1F will be included on the test on Tuesday because in class, Dr. Lavelle mentioned the test would only include information taught up to Friday's lecture, but the outline on his website shows that we should also know 1F. One of the TA also said we have to memorize the ...
- Tue Oct 23, 2018 5:30 pm
- Forum: *Particle in a Box
- Topic: Test 2
- Replies: 9
- Views: 1380
Re: Test 2
I believe we need to know what n,l,ml, and s means and how we can find those numbers
- Tue Oct 23, 2018 5:27 pm
- Forum: Administrative Questions and Class Announcements
- Topic: test 2
- Replies: 5
- Views: 716
Re: test 2
Test 2 is not technically on the material from the first unit but you still need to know how to covert within units and such. He does provide a really good outline explaining what will be on the test though on his Chem 14A website so check it out.
- Thu Oct 18, 2018 7:05 pm
- Forum: Properties of Light
- Topic: Wavelength and frequency proportions [ENDORSED]
- Replies: 5
- Views: 689
Re: Wavelength and frequency proportions [ENDORSED]
wavelength and frequency are inversely proportional but energy and frequency are proportional to each other. the frequency can be thought of as 1/wavelength
- Thu Oct 18, 2018 6:57 pm
- Forum: Photoelectric Effect
- Topic: units
- Replies: 12
- Views: 1145
Re: units
When measuring wavelength, the standard unit is meters so make sure you convert it. For energy, the standard until is Joules.
- Tue Oct 16, 2018 7:54 pm
- Forum: DeBroglie Equation
- Topic: Formulas
- Replies: 5
- Views: 529
Re: Formulas
We are given a cover sheet on the test that gives us all the formulas and constants we need!
- Thu Oct 11, 2018 10:23 am
- Forum: Significant Figures
- Topic: Calculators
- Replies: 20
- Views: 1952
Re: Calculators
You cannot use any form of graphing calculator on the test unfortunately so you will either need to borrow a scientific calculator or purchase one.
- Thu Oct 11, 2018 10:21 am
- Forum: Empirical & Molecular Formulas
- Topic: Naming Compounds on Test?
- Replies: 5
- Views: 517
Re: Naming Compounds on Test?
Lavelle and the TAs don't have to write the reaction equation without being given the name of the compound yet
- Thu Oct 11, 2018 10:20 am
- Forum: Empirical & Molecular Formulas
- Topic: when to multiply empirical formula [ENDORSED]
- Replies: 9
- Views: 4581
Re: when to multiply empirical formula [ENDORSED]
If you get a number like 3.5, multiply everything by 2 to get the whole number of 7 (this will be your subscript for the element in the molecular formula)
- Thu Oct 04, 2018 9:30 am
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Problem E7 converting atoms to moles
- Replies: 4
- Views: 372
Re: Problem E7 converting atoms to moles
Yes, all you have to do is convert the atoms to moles so you would divide 2.1x10^9 by 6.022x10^23 to get your final answer
- Thu Oct 04, 2018 9:27 am
- Forum: Empirical & Molecular Formulas
- Topic: Definition of Empirical Formula
- Replies: 8
- Views: 658
Re: Definition of Empirical Formula
The empirical formula represents the ratios of the atoms in their simplest form
- Wed Oct 03, 2018 1:18 pm
- Forum: SI Units, Unit Conversions
- Topic: SI Units
- Replies: 10
- Views: 778
Re: SI Units
For the test will we be expected to know the various SI unit prefixes and their meaning?