Search found 35 matches

by AJForte-2C
Sun Nov 22, 2020 11:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: NO2- Bent Molecular Geometry
Replies: 6
Views: 21

Re: NO2- Bent Molecular Geometry

Because a lone pair has more repulsion power than a bonding pair, you would end up with a bent shape with either one or two lone pairs on the central atom.
by AJForte-2C
Sun Nov 22, 2020 10:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: How to determine/remember molecular shape?
Replies: 4
Views: 45

Re: How to determine/remember molecular shape?

Hi! I would really recommend using the website below. Its an interactive simulation where you can play around with adding different combinations of single, double, and tripple bonds, and lone lone pairs. It gives you molecular, and electron geometry. Hope this helps! https://phet.colorado.edu/sims/h...
by AJForte-2C
Sun Nov 22, 2020 10:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pair E-
Replies: 37
Views: 126

Re: Lone Pair E-

lone pair e- do count as their own regions of electron density, including when you are creating a VSPER model. In addition, e- are more repulsive compared to bound atoms, which in turn affects the bound angles of a molecule.
by AJForte-2C
Sun Nov 22, 2020 10:07 pm
Forum: Hybridization
Topic: Hybrid Orbitals
Replies: 3
Views: 28

Re: Hybrid Orbitals

Hello! I think that was just an example of one of the different ways that orbitals are hybridized when bonding in order to "free up" electrons. Im pretty sure it can happen with other orbitals as well.
by AJForte-2C
Sun Nov 22, 2020 10:02 pm
Forum: Hybridization
Topic: Determining Hybridization
Replies: 4
Views: 28

Re: Determining Hybridization

Do you need to create an afbau diagram in order to properly determine hybridization, or is it not necessary?
by AJForte-2C
Sun Nov 15, 2020 3:03 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sapling #17: BF3 & NF3
Replies: 3
Views: 14

Re: Sapling #17: BF3 & NF3

Yes, I think because NF3 has the lone pair in addition to three bonds it occupies another axis. Whereas BF3 only has the the three bonds, so it only occupies one axis.
by AJForte-2C
Sun Nov 15, 2020 2:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: bond angles
Replies: 16
Views: 219

Re: bond angles

If lone pairs have more repulsion power than a bond, how does a lone pair affect the bonding angles of a molecule? How would we calculate it?
by AJForte-2C
Sun Nov 15, 2020 2:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent Shape
Replies: 31
Views: 819

Re: Bent Shape

A bent shape can have either one or two lone pairs on central atom.
by AJForte-2C
Sun Nov 15, 2020 2:18 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sapling HW Q17
Replies: 5
Views: 41

Re: Sapling HW Q17

Hi, it confuses me too. Can anyone tell me how to determine the electronegativity of atoms? Electronegativity is really just determined by periodic trends. Meaning the farther right you go in period, the more electronegative and atom will be, and the farther you go down a group the less electronega...
by AJForte-2C
Sun Nov 15, 2020 1:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Midterm #2
Replies: 14
Views: 68

Re: Midterm #2

I thinks this midterm is going to be less math based, so how are you guys studying for it?
by AJForte-2C
Sun Nov 08, 2020 12:47 pm
Forum: Coordinate Covalent Bonds
Topic: coordinate covalent bond
Replies: 7
Views: 531

Re: coordinate covalent bond

A coordinate covalent bond is formed when one atom donates a lone pair of electrons to another, essentially providing both necessary electrons for the covalent bond.
by AJForte-2C
Sun Nov 08, 2020 12:44 pm
Forum: Coordinate Covalent Bonds
Topic: carbon monoxide formal charges
Replies: 5
Views: 176

Re: carbon monoxide formal charges

This is because this is the only way for the molecule to achieve a charge of 0, which is the most stable state.
by AJForte-2C
Sun Nov 08, 2020 12:42 pm
Forum: Coordinate Covalent Bonds
Topic: Just to clear it up
Replies: 13
Views: 211

Re: Just to clear it up

Yes, all coordinate covalent bonds involve Lewis bases, but not all Lewis bases involve coordinate covalent bonds. Hope this helps!
by AJForte-2C
Sun Nov 08, 2020 12:40 pm
Forum: Coordinate Covalent Bonds
Topic: H20 Example from Lecture today
Replies: 4
Views: 33

Re: H20 Example from Lecture today

although OH- is a Lewis base, it does not form a coordinate covalent bond when bonding with a H+ ion. This is because in order for a coordinate covalent bond to form the anion needs to have a lone pair that will bond to an empty bonding region of the cation.
by AJForte-2C
Sun Nov 08, 2020 12:33 pm
Forum: Student Social/Study Group
Topic: Midterm 2
Replies: 31
Views: 201

Re: Midterm 2

Midterm 2 will not be cumulative and will cover the rest of outline 2 and probably some or all of outline 3. It should be during week 3. Hope this helps!
by AJForte-2C
Sat Oct 31, 2020 6:56 pm
Forum: Trends in The Periodic Table
Topic: In class question
Replies: 8
Views: 59

Re: In class question

I don't think you would be able to calculate the radius of if you have just one atom, but i believe that you can find most single atoms' radius because they have already been experimentally determined i.e. they're already known.
by AJForte-2C
Sat Oct 31, 2020 6:53 pm
Forum: Trends in The Periodic Table
Topic: ionization trend
Replies: 3
Views: 39

Re: ionization trend

hello, im not totally sure, but what i remember form high school chem is that metals with a low ionization energy have electrons that are easier to move around, so in something like a galvanic cell the electrons can move around and be transferd easier, meaning it makes creating a current easier.
by AJForte-2C
Sat Oct 31, 2020 6:48 pm
Forum: Trends in The Periodic Table
Topic: Ionization energy
Replies: 4
Views: 40

Re: Ionization energy

Oxygen has a lower ionization energy than nitrogen and fluorine, because it has one unpaired electron that is being repelled by the other electrons. This means that it is more willing to give up its first valence electron than nitrogen and fluorine.
by AJForte-2C
Sat Oct 31, 2020 6:43 pm
Forum: Trends in The Periodic Table
Topic: d trends
Replies: 3
Views: 43

Re: d trends

the 3d level is a lower energy level than the 4s, because once the shells get farther from the nucleus and subsequently closer together the shells can kind of overlap in a way that makes the subshells of some of the shells in a lower energy higher than those of a subshell in a higher energy. Hope th...
by AJForte-2C
Sat Oct 31, 2020 6:37 pm
Forum: Trends in The Periodic Table
Topic: Lecture 10/28 Question about S-Block Elements
Replies: 5
Views: 56

Re: Lecture 10/28 Question about S-Block Elements

It's probably important to note that they are all metals just to remember that they all have very similar properties. I think this will become more important when we start talking about ionic bonds, because the metals in the first two groups will often form ionic bonds with elements in the p-block.
by AJForte-2C
Sat Oct 24, 2020 10:36 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Sampling 30
Replies: 3
Views: 20

Re: Sampling 30

[Ne} is just shorthand for 1s^2, 2s^2, 2p^6, if youre looking at a periodic table you can start at Neon and move your way down the periodic table, counting a new element for each electron. Hope this helps!
by AJForte-2C
Sat Oct 24, 2020 10:24 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Advice for studying
Replies: 92
Views: 1924

Re: Advice for studying

I like to do practice problems, re-writing notes, and making flashcards. These things tend to help me remember things best long-term.Hope this helps!
by AJForte-2C
Sat Oct 24, 2020 10:22 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: quantum numbers
Replies: 2
Views: 38

Re: quantum numbers

Something I find helpful is to use a periodic table when working with quantum numbers and orbitals. Each row on the periodic table represents a new quantum level (row one is n=1, row two is n=2, row three is n=3...etc) from there you can look at each block and figure out where the electron is based ...
by AJForte-2C
Sat Oct 24, 2020 10:16 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty equation with ±
Replies: 10
Views: 49

Re: Uncertainty equation with ±

the solution is 2, because the range of (+/-) 1 is the uncertainty, making 2 the uncertainty.
by AJForte-2C
Sat Oct 24, 2020 10:11 pm
Forum: Student Social/Study Group
Topic: Midterm topics
Replies: 2
Views: 24

Re: Midterm topics

I was not able to attend Dr.Lavelle's discussion sections. Could someone tell me what parts of the outline will be covered? Do we need to know stuffs about orbitals and Schrodinger's equation? Dr. Lavelle sent out an email on 10/21 that said: "Midterm 1 covers material up to Wednesday of Week ...
by AJForte-2C
Sun Oct 18, 2020 12:15 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: delta E
Replies: 10
Views: 57

Re: delta E

Delta E is always negative because you are measuring the change in energy of the excited electron not the initial energy of the photon that excites it, meaning that its change in energy is negative to show that the electron goes back to its ground state after being excited.
by AJForte-2C
Sun Oct 18, 2020 12:03 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Can an electron stay in its excited state? [ENDORSED]
Replies: 18
Views: 107

Re: Can an electron stay in its excited state? [ENDORSED]

No, when an electron is in an excited it state it is also unstable. Eventually the electron will have to revert to its more stable position.
by AJForte-2C
Sun Oct 18, 2020 11:59 am
Forum: Administrative Questions and Class Announcements
Topic: Where can I buy a webcam for a reasonable price?
Replies: 60
Views: 911

Re: Where can I buy a webcam for a reasonable price?

I ended up getting one on amazon for like $20. My TA also said that you can just join the zoom with another device instead of having a webcam.
by AJForte-2C
Sun Oct 18, 2020 11:40 am
Forum: Properties of Light
Topic: Intensity v Energy
Replies: 18
Views: 120

Re: Intensity v Energy

The intensity of light is determined by the amplitude of its wave (the higher the amplitude the higher the intensity). Where as the energy of a wave of EMR is determined by its frequency(the higher the frequency the more energy per photon the light has). The way I like to remember it is that the &qu...
by AJForte-2C
Sun Oct 18, 2020 11:35 am
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 196
Views: 814

Re: How are you studying?

I usually take notes on lecture and add to them when I read the book. The things that come up in both lecture and the textbook I usually make flashcards to help me study later on.
by AJForte-2C
Sat Oct 10, 2020 3:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Tutoring? [ENDORSED]
Replies: 75
Views: 72405

Re: Tutoring? [ENDORSED]

Does anyone have good tutoring options now that we're gonna be online for the rest of the semester and most likely the rest of the year? Preferably for students not in westwood/on campus.
by AJForte-2C
Sat Oct 10, 2020 2:55 pm
Forum: Administrative Questions and Class Announcements
Topic: How to find my posts
Replies: 74
Views: 48779

Re: How to find my posts

Is there any way to keep track of how many times you have posted on chemistry community? Also does anyone know if posts on chemistry community roll over to the next week, or do I need to post 5 new posts every week?
by AJForte-2C
Sat Oct 10, 2020 2:47 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 200
Views: 140742

Re: Rusty on High School Chem [ENDORSED]

How helpful are Dr.Lavelle's office hours for reviewing high school chem topics? What happens in them? Are there a lot of students in them?
by AJForte-2C
Thu Oct 08, 2020 9:25 pm
Forum: Administrative Questions and Class Announcements
Topic: Accessing the E-textbook [ENDORSED]
Replies: 58
Views: 6054

Re: Accessing the E-textbook [ENDORSED]

I'm still a bit confused on how we get the E-book. After ordering through the UCLA Store, and getting the access code for Sapling, is the E-book just a link for the pdf file that also comes in the mail (or through email in recent cases) or is it accessible through Sapling? Once you get your login f...
by AJForte-2C
Thu Oct 08, 2020 9:12 pm
Forum: Administrative Questions and Class Announcements
Topic: Step Up Sessions
Replies: 71
Views: 4352

Re: Step Up Sessions

haley f wrote:Who are the Step up Sessions taught by? And are they helpful?

I think the Step Up sessions are taught by undergrads who have taken the class, but I havent been to one yet so i'm not sure if they are helpful or not.

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