Search found 31 matches

by Kaylee Sepulveda 3C
Sun Nov 10, 2019 9:40 pm
Forum: Sigma & Pi Bonds
Topic: Sigma vs pi bond
Replies: 3
Views: 11

Re: Sigma vs pi bond

Only p orbitals can form π bonds and σ bonds are formed by the overlap of atomic orbitals over the internuclear axis. π bonds are oriented perpendicularly to the internuclear axis. S and P orbitals can form different hybridizations, s + p → sp s + p + p → sp² s + p + p + p → sp³ Overlapping hybridiz...
by Kaylee Sepulveda 3C
Sun Nov 10, 2019 9:16 pm
Forum: Octet Exceptions
Topic: incomplete octet
Replies: 4
Views: 16

Re: incomplete octet

Usually, the elements that do this are B, Al, Li, and H. B and Al will usually form compounds where they only have six electrons instead of a complete octet.
by Kaylee Sepulveda 3C
Mon Nov 04, 2019 5:41 pm
Forum: Ionic & Covalent Bonds
Topic: Names and chemical formulas
Replies: 5
Views: 24

Re: Names and chemical formulas

It is possible that we will encounter common molecules and the formula will not be given.

Here is a helpful Quizlet to memorize them: https://quizlet.com/_3rd3b
by Kaylee Sepulveda 3C
Mon Nov 04, 2019 5:31 pm
Forum: *Shrodinger Equation
Topic: Shrodinger equation
Replies: 7
Views: 50

Re: Shrodinger equation

I believe the reason we covered the Schrödinger equation so briefly is that Dr. Lavelle doesn't really like this equation (I'm pretty sure one of the UA's said that) so we most likely won't encounter any problems where it will be necessary. Also, any equation we need will be given on the equation co...
by Kaylee Sepulveda 3C
Mon Nov 04, 2019 5:19 pm
Forum: Lewis Structures
Topic: Homework 2C3
Replies: 1
Views: 25

Re: Homework 2C3

When I asked an undergraduate assistant about this, they said that typically the chemical formula would be given, and on the rare occasion you get a question where the name is given and the formula is not, it will either be a very common compound or it will be obvious from the name. For example, pho...
by Kaylee Sepulveda 3C
Sun Nov 03, 2019 10:20 pm
Forum: Bond Lengths & Energies
Topic: Dino Nugget Mini review
Replies: 2
Views: 30

Re: Dino Nugget Mini review

They posted the answers on the original Dino Nugget thread but here

dino nugget answer.PNG
by Kaylee Sepulveda 3C
Sun Nov 03, 2019 10:11 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent Character
Replies: 3
Views: 10

Re: Covalent Character

Covalent character is referring to when an ionic bond takes on some covalent characteristics because electron distortion pulls electrons into the bonding area, so they are partially shared. I don't think we've discussed Fajan's rule yet but this explains the reasoning behind the phenomenon more (it ...
by Kaylee Sepulveda 3C
Sun Nov 03, 2019 10:03 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability and Covalent Character
Replies: 5
Views: 38

Re: Polarizability and Covalent Character

Polarizability is referring to how easily displaced an atom's electrons are by neighboring atoms. In an ionic bond, ions which cause large distortions are referred to as having 'high polarizing power'. This distorts the electron density of an ion, so the electrons are being pulled into the bonding r...
by Kaylee Sepulveda 3C
Sun Nov 03, 2019 9:49 pm
Forum: Dipole Moments
Topic: Dipole
Replies: 1
Views: 11

Re: Dipole

It's basically when the atoms in a molecule share electrons unequally.

μ = Q d
measured in debyes.

This video explains very nicely: https://www.youtube.com/watch?v=TyFd94TbdXU
by Kaylee Sepulveda 3C
Sun Nov 03, 2019 9:44 pm
Forum: Lewis Structures
Topic: "Most favorable" Diagram
Replies: 4
Views: 19

Re: "Most favorable" Diagram

When referring to "most favorable", you want as many formal charges to = 0 as possible. Also, for instance, if you're drawing an ion with a net charge that is, for example, -1, your formal charges should add up to the net charge of the ion. Formal charges of 0 would indicate a more stable,...
by Kaylee Sepulveda 3C
Sun Oct 27, 2019 9:19 pm
Forum: Lewis Structures
Topic: 2 Odd Configurations
Replies: 4
Views: 17

Re: 2 Odd Configurations

It's best to memorize exceptions to the rule because during the test you can use the rule to figure out every other answer. If we covered it in lecture, there is a good chance we will encounter it on a future test.
by Kaylee Sepulveda 3C
Sun Oct 27, 2019 9:14 pm
Forum: Ionic & Covalent Bonds
Topic: 2A 15
Replies: 2
Views: 11

Re: 2A 15

Yes, you're on the right track
by Kaylee Sepulveda 3C
Sun Oct 27, 2019 9:02 pm
Forum: Resonance Structures
Topic: Resonance Structures
Replies: 4
Views: 24

Re: Resonance Structures

I don't believe there is a particular formula for determining the number of resonance structures, so you would count the number of possible resonance structures by drawing every valid lewis structure until there aren't any possible alternative configurations.
by Kaylee Sepulveda 3C
Sun Oct 27, 2019 8:38 pm
Forum: Bond Lengths & Energies
Topic: bond lengths
Replies: 1
Views: 16

Re: bond lengths

You can estimate bond lengths by adding the covalent radii of the two atoms, but this is not entirely accurate and experimental observation is always the better option.
by Kaylee Sepulveda 3C
Sun Oct 27, 2019 8:25 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures
Replies: 5
Views: 18

Re: Drawing Lewis Structures

This video explains the idea very simply: https://www.youtube.com/watch?v=cIuXl7o6mAw
by Kaylee Sepulveda 3C
Sun Oct 20, 2019 11:59 pm
Forum: Quantum Numbers and The H-Atom
Topic: orientation of orbitals
Replies: 4
Views: 30

Re: orientation of orbitals

Does this image help?

Image
by Kaylee Sepulveda 3C
Sun Oct 20, 2019 11:56 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Nodal Planes
Replies: 2
Views: 16

Re: Nodal Planes

A nodal plane is a plane where the probability of finding an electron is zero. You can find the coordinates of these planes by solving the Schrödinger wave equation
by Kaylee Sepulveda 3C
Sun Oct 20, 2019 11:50 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers and Energy Levels
Replies: 2
Views: 24

Re: Quantum Numbers and Energy Levels

The value of the energy level is proportional to 1/n^2 which gives a series 1, 1/4, 1/9, 1/16, and so on
by Kaylee Sepulveda 3C
Sun Oct 20, 2019 11:41 pm
Forum: Trends in The Periodic Table
Topic: memorization
Replies: 3
Views: 29

Re: memorization

Here is a quick video that explains it:
https://youtu.be/XK-WTYncldA
by Kaylee Sepulveda 3C
Sun Oct 20, 2019 11:27 pm
Forum: Properties of Light
Topic: 1B. 9
Replies: 2
Views: 14

Re: 1B. 9

You find the Energy per photon with E = hc/λ, and divide the 64J by the energy per photon to find out the number of photons, then you can multiply by Planck's constant to find the mols of photons
by Kaylee Sepulveda 3C
Sun Oct 13, 2019 8:35 pm
Forum: Properties of Electrons
Topic: Mass of a neutron (1B.23)
Replies: 2
Views: 14

Re: Mass of a neutron (1B.23)

The mass of a neutron is 1.6749286*10^-27 kg
by Kaylee Sepulveda 3C
Sun Oct 13, 2019 8:17 pm
Forum: Properties of Light
Topic: Helpful videos
Replies: 1
Views: 10

Re: Helpful videos

Crash Course Part 1 [youtube]https://www.youtube.com/watch?v=7kb1VT0J3DE[/youtube]

Crash Course Part 2 [youtube]https://www.youtube.com/watch?v=qO_W70VegbQ[/youtube]

Introduction (pretty boring but covers basic concepts) [youtube]https://www.youtube.com/watch?v=HC81oYe43DI[/youtube]
by Kaylee Sepulveda 3C
Sun Oct 13, 2019 8:12 pm
Forum: Properties of Electrons
Topic: Photoelectric Effect
Replies: 3
Views: 18

Re: Photoelectric Effect

Electrons aren't emitted unless the energy of the photon is greater than or equal to the energy to remove an electron, even for high-intensity light. This outcome was unexpected, because the light was no longer behaving like a wave, otherwise simply raising the intensity would have been sufficient t...
by Kaylee Sepulveda 3C
Sun Oct 13, 2019 8:05 pm
Forum: Properties of Light
Topic: Intensity & Amplitude
Replies: 7
Views: 59

Re: Intensity & Amplitude

Intensity is proportional to the square of amplitude. So, as a general rule, as the amplitude of a wave increases, so will the intensity.
by Kaylee Sepulveda 3C
Sun Oct 13, 2019 7:58 pm
Forum: SI Units, Unit Conversions
Topic: knowing how many sig figs to use
Replies: 17
Views: 91

Re: knowing how many sig figs to use

To keep your work as accurate as possible, try not to round until the final answer. On the basis that you do round, keeping a certain number of significant figures should be enough to result in the final answer. For example, if the answer needs to have two significant figures, keeping four signific...
by Kaylee Sepulveda 3C
Sun Oct 06, 2019 9:18 pm
Forum: Administrative Questions and Class Announcements
Topic: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE
Replies: 44
Views: 1132

Re: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE

Do we have to sign up for your workshops or are students welcome to just show up?
by Kaylee Sepulveda 3C
Sun Oct 06, 2019 9:13 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 61
Views: 18351

Re: Final Jitters

Before the test, you definitely want to make sure you are in the right head space. If you know you have an exam coming up, make an effort to get sleep and eat a good breakfast. Give yourself adequate time to study in advance so you do not feel like you are cramming the night before. Some light revie...
by Kaylee Sepulveda 3C
Sun Oct 06, 2019 9:07 pm
Forum: Significant Figures
Topic: Reviewing Sig Figs
Replies: 3
Views: 25

Reviewing Sig Figs

I'm a bit rusty on sig figs since I haven't taken chem in a few years, does anybody have any specific resources for practicing that they found helpful? I learn better from practicing than memorizing rules and definitions.
by Kaylee Sepulveda 3C
Sun Oct 06, 2019 9:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 139
Views: 83803

Re: Advice from a Medical Student [ENDORSED]

Do you have any advice for professors who are not as accommodating as Lavelle? Did you ever struggle in a specific class because of a lack of resources/support?
by Kaylee Sepulveda 3C
Sun Oct 06, 2019 8:58 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 165
Views: 100732

Re: Rusty on High School Chem [ENDORSED]

Its been a while for me too! I know this is basic, but knowing the common ions and compounds is so important to setting up problems and writing equations, but our course reader doesn't include much about them. I have this review list that will totally help!Common Ions.docx Thank you, I have been st...
by Kaylee Sepulveda 3C
Sun Oct 06, 2019 8:50 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 117
Views: 1516

Re: Advice from a Medical Student - Part II [ENDORSED]

Thank you for sharing your experience. I am planning to go to medical school, and it is comforting to hear from people who have been in my situation and are doing well.

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