Search found 41 matches

by Andy Hernandez
Sun Nov 29, 2020 11:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Easiest Way to Memorize Shape Names
Replies: 9
Views: 18

Re: Easiest Way to Memorize Shape Names

I think just doing a lot of practice problems is beneficial in memorizing the shapes and bond angles and becoming more familiar with the molecules. I also think that being able to visualize the 3D shape of the molecule is helpful. One of the UA's shared this website with us: http://intro.chem.oksta...
by Andy Hernandez
Sun Nov 29, 2020 11:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: H2O VSEPR
Replies: 27
Views: 67

Re: H2O VSEPR

Although there are 4 bonding regions for H20, there are still 2 lone pairs, makes the shape of molecule bent since the two lone pairs are pushing the electrons from the two bonded atoms
by Andy Hernandez
Sun Nov 29, 2020 11:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pair E-
Replies: 47
Views: 155

Re: Lone Pair E-

Lone pair electrons do count as their own region of electron density
by Andy Hernandez
Sun Nov 29, 2020 11:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Equatorial/ Axial Planes
Replies: 14
Views: 33

Re: Equatorial/ Axial Planes

Equitorial planes are basically side to side while axial is up and down. so like in an xy graph, y is axial, and x is equitorial
by Andy Hernandez
Sun Nov 29, 2020 11:35 pm
Forum: Hybridization
Topic: How to find the hybridization
Replies: 12
Views: 42

Re: How to find the hybridization

count the regions of e- density which is the number of bonds and lone pairs
by Andy Hernandez
Sun Nov 29, 2020 11:34 pm
Forum: Hybridization
Topic: Sapling Week 7/8 HW #11
Replies: 13
Views: 38

Re: Sapling Week 7/8 HW #11

sp3 bc regions of e- density equals the number of hybrid orbitals. 1 LP plus 3 bonds equal 4 areas of e- density so its sp3
by Andy Hernandez
Sun Nov 29, 2020 11:32 pm
Forum: Hybridization
Topic: Sigma and Pi bonds
Replies: 19
Views: 48

Re: Sigma and Pi bonds

sigma bonds are just single bonds and pi bonds are in triple and double bonds. However, in a double bond, one is a sigma bond and the other is a pi bond. And in triple there are 2 pi bonds and one sigma bond
by Andy Hernandez
Sun Nov 29, 2020 11:30 pm
Forum: Hybridization
Topic: Confused on hybridization conceptually
Replies: 9
Views: 35

Re: Confused on hybridization conceptually

Its easier if you write down the notes he gave in the lecture and have them at hand to refer to. Like by figuring out the regions of e- density you can figure out # of hybrid orbitals, and what I do is just have my notes to refer to, to figure out the hybridization formula. Gonna take some memorizat...
by Andy Hernandez
Sun Nov 29, 2020 11:28 pm
Forum: Hybridization
Topic: How to simply determine hybridization
Replies: 18
Views: 54

Re: How to simply determine hybridization

You calculate the regions of e- density to get the number of hybrid orbitals
by Andy Hernandez
Sun Nov 29, 2020 11:20 pm
Forum: Hybridization
Topic: Sapling #11
Replies: 19
Views: 54

Re: Sapling #11

its sp3 bc the number of regions of e- density is 4, 1 lone pair and 3 bonds
by Andy Hernandez
Sun Nov 29, 2020 11:13 pm
Forum: Hybridization
Topic: Sapling #12
Replies: 27
Views: 105

Re: Sapling #12

When trying to find the hybridization orbitals look for the regions of e- density. C and O in that problem have 4 areas, u get sp3, S P P P being the 4 different orbitals that can have electrons.
by Andy Hernandez
Sun Nov 15, 2020 8:53 pm
Forum: Student Social/Study Group
Topic: Class grade
Replies: 18
Views: 96

Re: Class grade

What are the negative impacts of changing it to pass/ no pass?
by Andy Hernandez
Sun Nov 15, 2020 8:46 pm
Forum: Student Social/Study Group
Topic: Post Midterm Blues
Replies: 71
Views: 452

Re: Post Midterm Blues

Sameeee. Before he posted the grades i knew for a fact i missed five questions and im [censored] bruh there goes my grade. I ended getting a 76% and im not proud of it but I'l take it. Now to grind for the next one ye
by Andy Hernandez
Sun Nov 15, 2020 8:31 pm
Forum: Student Social/Study Group
Topic: Positive Encouragement for Midterm Week
Replies: 14
Views: 44

Re: Positive Encouragement for Midterm Week

Not me barely catching up on lectures and sapling haha. I kinda like the last minute study grind but its very stressful
by Andy Hernandez
Sun Nov 15, 2020 8:20 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Importance of anions and cations
Replies: 15
Views: 49

Re: Importance of anions and cations

The way I remember cations and anions is that cations have a "t" which closely resembles a "+" sign. So elements with the "+" are cations which means an e- was removed. And basically once you know what a cation is, one can deduce that an anion is the opposite.
by Andy Hernandez
Sun Nov 15, 2020 8:20 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Importance of anions and cations
Replies: 15
Views: 49

Re: Importance of anions and cations

The way I remember cations and anions is that cations have a "t" which closely resembles a "+" sign. So elements with the "+" are cations which means an e- was removed. And basically once you know what a cation is, one can deduce that an anion is the opposite.
by Andy Hernandez
Sun Nov 15, 2020 8:17 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: polarizing power
Replies: 3
Views: 18

Re: polarizing power

Polarizability is how easily an electron cloud is distorted by an electric field. E- disortion is proportional to the polarizability of e-
by Andy Hernandez
Sun Nov 08, 2020 10:47 pm
Forum: Student Social/Study Group
Topic: Studying From Home
Replies: 91
Views: 294

Re: Studying From Home

I throw my phone against the wall and attempt to not touch it for at least an hour. If you're stuck, try to have a couple people you can ask questions to and hopefully they can explain it to you.
by Andy Hernandez
Sun Nov 08, 2020 10:45 pm
Forum: Student Social/Study Group
Topic: Mid-quarter Check in
Replies: 67
Views: 209

Re: Mid-quarter Check in

I want to be in in-person classes :(. Harder for me to concentrate online and it's harder to make friends to study with. Got LS30 midterm this upcoming week and im nervous.
by Andy Hernandez
Sun Nov 08, 2020 10:24 pm
Forum: Bond Lengths & Energies
Topic: Delocalized Electrons
Replies: 5
Views: 33

Re: Delocalized Electrons

resonance means electrons are delocalized which means it's more stable.
by Andy Hernandez
Sun Nov 08, 2020 10:10 pm
Forum: Bond Lengths & Energies
Topic: Bond length
Replies: 11
Views: 39

Re: Bond length

triple bonds are the shortest, next is second, finally single bonds r the longest
by Andy Hernandez
Sun Nov 08, 2020 9:53 pm
Forum: Ionic & Covalent Bonds
Topic: Atomic Radius
Replies: 38
Views: 145

Re: Atomic Radius

As we go across a period, the number of protons increase one by one, it results in a progressively higher electrostatic attraction
by Andy Hernandez
Sun Nov 01, 2020 11:44 pm
Forum: Administrative Questions and Class Announcements
Topic: Textbook solutions
Replies: 3
Views: 45

Re: Textbook solutions

thanks this helped so much!!!
by Andy Hernandez
Sun Nov 01, 2020 11:35 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Sapling HW Q17
Replies: 18
Views: 102

Re: Sapling HW Q17

Atomic radius increases as we move along the periodic table
by Andy Hernandez
Sun Nov 01, 2020 11:33 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration
Replies: 8
Views: 47

Re: Electron Configuration

Why is 4s filled first?
by Andy Hernandez
Sun Nov 01, 2020 11:23 pm
Forum: Properties of Light
Topic: Electromagnetic Spectrum
Replies: 7
Views: 46

Re: Electromagnetic Spectrum

400-700 visible light aka balmer series, 100-120, UV aka Lyman
by Andy Hernandez
Sun Nov 01, 2020 11:05 pm
Forum: Properties of Light
Topic: Speed of light
Replies: 25
Views: 139

Re: Speed of light

2.998*10^8
by Andy Hernandez
Sun Oct 25, 2020 10:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 291
Views: 136551

Re: Saying Thank You to Dr. Lavelle

Early appreciation post saying thanks for chem community bc this forum is saving me
by Andy Hernandez
Sun Oct 25, 2020 9:39 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Module Question
Replies: 4
Views: 60

Re: Photoelectric Effect Module Question

Hey, I have question from this same module. Question 30. "Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1. .... What is the frequency of the incident light on the sodium metal surface?" Are you ...
by Andy Hernandez
Sun Oct 25, 2020 9:12 pm
Forum: Einstein Equation
Topic: Post Assement audio visual
Replies: 3
Views: 39

Re: Post Assement audio visual

A tip for anyone seeing this. I kept getting the wrong answer bc i didn't put parantheses around (1mol/ Avogdro's constant) so make sure to do that. I was stuck on this problem for thirty minutes bc of this :(
by Andy Hernandez
Sun Oct 25, 2020 7:44 pm
Forum: SI Units, Unit Conversions
Topic: Help Understanding SI Units?
Replies: 7
Views: 108

Re: Help Understanding SI Units?

angstrom is 10^-10
by Andy Hernandez
Sun Oct 25, 2020 7:14 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Module #29
Replies: 9
Views: 78

Re: Photoelectric Effect Module #29

Wait, so what's the answer?
by Andy Hernandez
Sun Oct 18, 2020 10:37 pm
Forum: Student Social/Study Group
Topic: Midterm
Replies: 7
Views: 25

Re: Midterm

anyone want to form study groups for the midterm?
by Andy Hernandez
Sun Oct 18, 2020 10:34 pm
Forum: Administrative Questions and Class Announcements
Topic: Tutoring? [ENDORSED]
Replies: 77
Views: 73903

Re: Tutoring? [ENDORSED]

Im seeing this post from a few years ago and a reply said "I'm creating multiple review sessions for midterms/finals" and I assume it was Dr Lavelle or someone with the influence to create them. Will these session be created for the upcoming midterm in week 4?
by Andy Hernandez
Sun Oct 18, 2020 10:31 pm
Forum: Einstein Equation
Topic: m vs nm
Replies: 66
Views: 361

Re: m vs nm

Unless specified, its ok to write in either format
by Andy Hernandez
Sun Oct 18, 2020 10:28 pm
Forum: Administrative Questions and Class Announcements
Topic: Where can I buy a webcam for a reasonable price?
Replies: 60
Views: 949

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

I believe we can use our phones instead so maybe you can pursue that option instead of buying one.
by Andy Hernandez
Sun Oct 18, 2020 10:27 pm
Forum: Photoelectric Effect
Topic: photoelectric effect
Replies: 17
Views: 100

Re: photoelectric effect

yes, the threshold is the same thing as the work function
by Andy Hernandez
Sun Oct 11, 2020 8:09 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 191
Views: 14511

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

How did you figure out how to do homework problems you were confused on? with covid and all, I'm having trouble even figuring out the basics of chem.
by Andy Hernandez
Sun Oct 11, 2020 5:32 pm
Forum: Molarity, Solutions, Dilutions
Topic: Sapling HW Number 7
Replies: 12
Views: 119

Re: Sapling HW Number 7

That was very helpful, thanks for the help.
by Andy Hernandez
Sun Oct 11, 2020 4:25 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 205
Views: 141592

Re: Rusty on High School Chem [ENDORSED]

Coming from 2020 student, I'm semi-lost haha. Online is definitely not fun.
by Andy Hernandez
Sun Oct 11, 2020 4:25 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 205
Views: 141592

Re: Rusty on High School Chem [ENDORSED]

Coming from 2020 student, I'm semi-lost haha. Online is definitely not fun.

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