Search found 29 matches

by Julia Jones 1G
Thu Dec 06, 2018 10:40 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent Structures
Replies: 12
Views: 113

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.
by Julia Jones 1G
Thu Dec 06, 2018 10:38 am
Forum: Determining Molecular Shape (VSEPR)
Topic: AX3E
Replies: 18
Views: 123

Re: AX3E

Because of the lone pair, AX3E would be trigonal pyramidal and not tetrahedral.
by Julia Jones 1G
Thu Dec 06, 2018 10:36 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Notation
Replies: 10
Views: 60

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.
by Julia Jones 1G
Sat Dec 01, 2018 1:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam
Replies: 22
Views: 291

Re: Final Exam

The final is cumulative, Dr. Lavelle said it will cover everything on the syllabus.
by Julia Jones 1G
Sat Dec 01, 2018 1:46 pm
Forum: Hybridization
Topic: Difference between hybridization and hybrid orbitals
Replies: 4
Views: 80

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.
by Julia Jones 1G
Fri Nov 23, 2018 1:07 am
Forum: Administrative Questions and Class Announcements
Topic: Test 3 Question
Replies: 4
Views: 91

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!
by Julia Jones 1G
Fri Nov 23, 2018 1:05 am
Forum: Dipole Moments
Topic: Canceling?
Replies: 3
Views: 37

Re: Canceling?

yes, the dipole vectors can cancel eachother which causes the molecule to be nonpolar.
by Julia Jones 1G
Fri Nov 23, 2018 1:03 am
Forum: Dipole Moments
Topic: Chemistry Community
Replies: 5
Views: 39

Re: Chemistry Community

You can get points for creating your own question, replying to other questions, and asking a question on another thread
by Julia Jones 1G
Fri Nov 16, 2018 9:57 am
Forum: Administrative Questions and Class Announcements
Topic: 14B Co-Requisites
Replies: 4
Views: 94

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...
by Julia Jones 1G
Fri Nov 16, 2018 9:54 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Linear Shape of O2
Replies: 4
Views: 49

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.
by Julia Jones 1G
Fri Nov 16, 2018 9:49 am
Forum: Administrative Questions and Class Announcements
Topic: Homework Due Week 7
Replies: 10
Views: 167

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.
by Julia Jones 1G
Fri Nov 09, 2018 9:49 am
Forum: Dipole Moments
Topic: HCl
Replies: 6
Views: 63

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
by Julia Jones 1G
Fri Nov 09, 2018 9:46 am
Forum: Electronegativity
Topic: electronegativity trends
Replies: 6
Views: 69

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.
by Julia Jones 1G
Fri Nov 09, 2018 9:41 am
Forum: Bond Lengths & Energies
Topic: MIDTERM Bond Length Question
Replies: 15
Views: 193

Re: MIDTERM Bond Length Question

In discussion, our TA said they would be accepting any answer in between 120 and 140.
by Julia Jones 1G
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: 322

Re: Is electron removed from 3d or 4s first?

Electrons are first removed from the 4s orbital befofe the 3d orbital.
by Julia Jones 1G
Fri Nov 02, 2018 10:13 am
Forum: Administrative Questions and Class Announcements
Topic: Blue Book Midterm
Replies: 4
Views: 95

Re: Blue Book Midterm

We do not need a blue book for the midterm
by Julia Jones 1G
Tue Oct 23, 2018 5:36 pm
Forum: Administrative Questions and Class Announcements
Topic: Test On Tuesday
Replies: 10
Views: 369

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 ...
by Julia Jones 1G
Tue Oct 23, 2018 5:30 pm
Forum: *Particle in a Box
Topic: Test 2
Replies: 9
Views: 226

Re: Test 2

I believe we need to know what n,l,ml, and s means and how we can find those numbers
by Julia Jones 1G
Tue Oct 23, 2018 5:27 pm
Forum: Administrative Questions and Class Announcements
Topic: test 2
Replies: 5
Views: 196

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.
by Julia Jones 1G
Thu Oct 18, 2018 7:05 pm
Forum: Properties of Light
Topic: Wavelength and frequency proportions [ENDORSED]
Replies: 5
Views: 116

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
by Julia Jones 1G
Thu Oct 18, 2018 6:57 pm
Forum: Photoelectric Effect
Topic: units
Replies: 12
Views: 126

Re: units

When measuring wavelength, the standard unit is meters so make sure you convert it. For energy, the standard until is Joules.
by Julia Jones 1G
Tue Oct 16, 2018 7:54 pm
Forum: DeBroglie Equation
Topic: Formulas
Replies: 5
Views: 49

Re: Formulas

We are given a cover sheet on the test that gives us all the formulas and constants we need!
by Julia Jones 1G
Thu Oct 11, 2018 10:23 am
Forum: Significant Figures
Topic: Calculators
Replies: 16
Views: 266

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.
by Julia Jones 1G
Thu Oct 11, 2018 10:21 am
Forum: Empirical & Molecular Formulas
Topic: Naming Compounds on Test?
Replies: 5
Views: 135

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
by Julia Jones 1G
Thu Oct 11, 2018 10:20 am
Forum: Empirical & Molecular Formulas
Topic: when to multiply empirical formula [ENDORSED]
Replies: 9
Views: 209

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)
by Julia Jones 1G
Thu Oct 04, 2018 9:30 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Problem E7 converting atoms to moles
Replies: 4
Views: 40

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
by Julia Jones 1G
Thu Oct 04, 2018 9:27 am
Forum: Empirical & Molecular Formulas
Topic: Definition of Empirical Formula
Replies: 8
Views: 111

Re: Definition of Empirical Formula

The empirical formula represents the ratios of the atoms in their simplest form
by Julia Jones 1G
Wed Oct 03, 2018 1:18 pm
Forum: SI Units, Unit Conversions
Topic: SI Units
Replies: 10
Views: 171

Re: SI Units

For the test will we be expected to know the various SI unit prefixes and their meaning?

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