Search found 60 matches

by 505352202
Sat Dec 12, 2020 10:56 am
Forum: Calculating the pH of Salt Solutions
Topic: Nuetralization example
Replies: 2
Views: 19

Re: Nuetralization example

It is still an acid-base reaction since there is an acid and base for the reaction, however, I am not sure if it's a neutralization reaction since the product is neither water nor salt.
by 505352202
Sat Dec 12, 2020 10:42 am
Forum: Hybridization
Topic: Double Pi Bonds
Replies: 6
Views: 80

Re: Double Pi Bonds

The triple bond is composed of one σ bond and two π bonds. The sigma bond is formed from head-to-head overlap of the sp hybrid orbitals from the C and N atoms. The two π bonds in the triple bond are formed from overlap of the two unhybridized p atomic orbitals on each C and N atom.
by 505352202
Sat Dec 12, 2020 10:41 am
Forum: Bronsted Acids & Bases
Topic: Bronsted Acids and Bases
Replies: 6
Views: 50

Re: Bronsted Acids and Bases

I use this to help me remember: Bronsted Acid is Proton Donor (BAPD) Bronsted Base is Proton Acceptor (BBPA) and then for Lewis definitions: Lewis Acids are Electron Acceptors (LAEA) Lewis Bases are Electron Donors (LBED) *I put weird words to help me remember like Los Angeles Electron Asooscation a...
by 505352202
Tue Dec 08, 2020 1:57 pm
Forum: Administrative Questions and Class Announcements
Topic: Ebook/Textbook problems
Replies: 9
Views: 115

Re: Ebook/Textbook problems

I have the same issue, and it's really frustrating. I refresh the page, and sometimes it works. Thank you for voicing this. I thought I was the only one.
by 505352202
Tue Dec 08, 2020 1:57 pm
Forum: Administrative Questions and Class Announcements
Topic: Ebook/Textbook problems
Replies: 9
Views: 115

Re: Ebook/Textbook problems

I have the same issue, and it's really frustrating. I refresh the page, and sometimes it works. Thank you for voicing this. I thought I was the only one.
by 505352202
Tue Dec 08, 2020 1:54 pm
Forum: Student Social/Study Group
Topic: Finals Review
Replies: 4
Views: 52

Re: Finals Review

You should email them because they don't always post them.
by 505352202
Tue Dec 08, 2020 1:54 pm
Forum: Bond Lengths & Energies
Topic: Compound stability
Replies: 5
Views: 38

Re: Compound stability

I think you need to take both of them into consideration and resonance since resonance provides stability aswell. I wonder if we can choose just one of those characteristics and base our answers on that.
by 505352202
Mon Dec 07, 2020 10:58 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Why is HF not classified as a strong acid?
Replies: 19
Views: 160

Re: Why is HF not classified as a strong acid?

I am not sure if this was already mentioned, but the bond length of HF is pretty short, so it makes it harder to break that bond. Shorter bonds = stronger bonds = weaker acids.
by 505352202
Mon Dec 07, 2020 10:50 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: H3O+ versus H+
Replies: 16
Views: 125

Re: H3O+ versus H+

Most of the time, H+ is referring to H3O+. It is just a shorter way to write it. You have to remember that there is interaction with water H2O, so when you have that additional H+, you get H3O+ Hydronium.
by 505352202
Mon Dec 07, 2020 10:45 pm
Forum: Calculating the pH of Salt Solutions
Topic: -OH vs OH-
Replies: 13
Views: 93

Re: -OH vs OH-

It does not really matter. When he puts the - before like -OH, he is trying to emphasize that the oxygen is the atom with the negative charge and not the hydrogen.

I hope this helps!
by 505352202
Mon Nov 30, 2020 12:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 231
Views: 118114

Re: Advice from a Medical Student [ENDORSED]

Thank you for this. It is easy to lose sight of the bigger picture (the bigger goal) when there is so much work to do.
by 505352202
Mon Nov 30, 2020 12:00 pm
Forum: Student Social/Study Group
Topic: Final Exam Structure
Replies: 12
Views: 121

Re: Final Exam Structure

Constance Newell wrote:Is our exam still on the weekend? Or did the date change?

Our exam is scheduled for Sunday, December 13 from 11:30 am-2:30 pm
by 505352202
Mon Nov 30, 2020 11:59 am
Forum: Student Social/Study Group
Topic: Final Exam Structure
Replies: 12
Views: 121

Re: Final Exam Structure

Constance Newell wrote:Is our exam still on the weekend? Or did the date change?

Our exam is scheduled for Sunday, December 13 from 11:30 am-2:30 pm
by 505352202
Mon Nov 23, 2020 3:28 pm
Forum: Student Social/Study Group
Topic: How to relax after midterms
Replies: 54
Views: 306

Re: How to relax after midterms

I try not to think of the exam because it makes me feel worse, and there is nothing that you can do after the exam. I go for a long jog/walk/run after these exams and it helps (I do it for the endorphins lol)
by 505352202
Mon Nov 23, 2020 3:24 pm
Forum: Student Social/Study Group
Topic: How have your study habits changed?
Replies: 45
Views: 351

Re: How have your study habits changed?

I make review sheets after every lecture to make sure all the information I need is in a condensed format that I can look back at when I do my textbook problems.
by 505352202
Mon Nov 23, 2020 3:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Lectures Thanksgiving week
Replies: 8
Views: 74

Re: Lectures Thanksgiving week

Do all the other discussion sections meet this week? I have mine tomorrow at 9am and I am not sure.
by 505352202
Mon Nov 23, 2020 3:16 pm
Forum: Student Social/Study Group
Topic: Post Midterm Blues
Replies: 71
Views: 658

Re: Post Midterm Blues

Are the exam grades out yet? Does anyone know?
by 505352202
Mon Nov 23, 2020 3:14 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 2 Question
Replies: 12
Views: 151

Re: Midterm 2 Question

Make sure you have the latest version of respondus and zoom too if you had trouble before! I searched online for how to check if you have the most updated version and how to update, which was pretty simple. How did you update respondus? Hi, sorry for this late response! Basically you run Respondus ...
by 505352202
Mon Nov 16, 2020 5:04 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 2 Question
Replies: 12
Views: 151

Re: Midterm 2 Question

Kyla Villarama 3J wrote:Make sure you have the latest version of respondus and zoom too if you had trouble before! I searched online for how to check if you have the most updated version and how to update, which was pretty simple.

How did you update respondus?
by 505352202
Mon Nov 16, 2020 5:02 pm
Forum: Administrative Questions and Class Announcements
Topic: Updating Respondus Lockdown Browser
Replies: 8
Views: 229

Re: Updating Respondus Lockdown Browser

I don't know how to update either. I can't find that button. Is it maybe different for a mac laptop because that is what I am using.
by 505352202
Sun Nov 15, 2020 3:34 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Order of Intermolecular Forces
Replies: 5
Views: 56

Re: Order of Intermolecular Forces

LeanneBagood_2E wrote:adding on to this, where would van der waals be in the order?


Aren't van der waals and london dispersion the same force?
by 505352202
Sun Nov 15, 2020 3:28 pm
Forum: Ionic & Covalent Bonds
Topic: Periodic Table and Equation Sheet
Replies: 11
Views: 84

Re: Periodic Table and Equation Sheet

This is pretty off-topic, but I think I may have missed some information during the discussions... I don't know where to find the given periodic table and equations sheet to print. Can someone point me towards it? Thanks :) You can find it on the tops of the class website under "Constants and ...
by 505352202
Sun Nov 15, 2020 3:22 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Textbook Exercise 2D.11
Replies: 3
Views: 38

Re: Textbook Exercise 2D.11

I like to think of high polarizability for anions since they have more electrons and more electrons = further from the nucleus and aren't easily controlled by that positive charge (so more electrons or negative charge you have, the higher the polarizability) vs. high polarizing power for cations sin...
by 505352202
Sun Nov 15, 2020 3:13 pm
Forum: Bond Lengths & Energies
Topic: PCI5 lewis structure
Replies: 5
Views: 42

Re: PCI5 lewis structure

Crystal Odipo wrote:In last Friday's lecture when we draw the Lewis structure of PCI5, how do we determine which atom of CL gets the darker shaped wedge to show the atom is coming towards us and how do we decide which atom is the shaded wedge, pointing away from us?



Will this topic be in our 2nd midterm?
by 505352202
Sun Nov 15, 2020 3:10 pm
Forum: Electronegativity
Topic: Electronegativity v Electron Affinity
Replies: 4
Views: 58

Re: Electronegativity v Electron Affinity

The other difference that I think helps distinguish them is that electronegativity is a chemical property of electron attraction vs. electron affinity, which is the amount of energy released when an electron is gained.
by 505352202
Sat Nov 14, 2020 4:19 pm
Forum: Octet Exceptions
Topic: Radicals
Replies: 7
Views: 103

Re: Radicals

Is there a way to predict which element in an atom will have the radical? this came up in textbook problem 2C.5. The radical went with Cl rather than O, and I can't explain why except for that Cl has an odd number of valence electrons to start with. Hi! I believe that the placement of the lone elec...
by 505352202
Sat Nov 14, 2020 3:51 pm
Forum: Student Social/Study Group
Topic: Midterm and Compound Memorization
Replies: 6
Views: 78

Re: Midterm and Compound Memorization

We haven't had a lecture on naming compounds so I hope he provides us with the chemical formulas.
by 505352202
Sat Nov 14, 2020 3:31 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Textbook Problem 1.E.25
Replies: 7
Views: 77

Re: Textbook Problem 1.E.25

Hi! The solutions manual on sapling says that the answer to C) is (n-1)d3ns2 for group 5 transition metals, which is correct because group 5 metals have 3 valence electrons in the d orbital and 2 valence electrons in the s orbital (maybe you were looking at the wrong question possibly?) Hope this c...
by 505352202
Fri Nov 13, 2020 6:27 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Textbook Problem 1.E.25
Replies: 7
Views: 77

Re: Textbook Problem 1.E.25

The alkali metals have a valence shell with the configuration ns 1 , with n being the principal quantum number of the atom. Similarly, a valence shell for a group 15 atom would have the configuration ns 2 np 3 . A group 5 transition metal would have a configuration of (n-1)d 3 ns 2 . The coinage me...
by 505352202
Fri Nov 13, 2020 1:43 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Textbook Problem 1.E.25
Replies: 7
Views: 77

Re: Textbook Problem 1.E.25

The alkali metals have a valence shell with the configuration ns 1 , with n being the principal quantum number of the atom. Similarly, a valence shell for a group 15 atom would have the configuration ns 2 np 3 . A group 5 transition metal would have a configuration of (n-1)d 3 ns 2 . The coinage me...
by 505352202
Sun Nov 08, 2020 10:41 am
Forum: Determining Molecular Shape (VSEPR)
Topic: n, l, mi
Replies: 8
Views: 63

Re: n, l, mi

https://www.youtube.com/watch?v=Aoi4j8es4gQ

This video helped me conceptualize this topic. I hope it helps you!
by 505352202
Sun Nov 08, 2020 10:34 am
Forum: Trends in The Periodic Table
Topic: Period Trends
Replies: 8
Views: 41

Re: Period Trends

I really love this video because it discusses the rends very clearly: https://www.youtube.com/watch?v=hePb00CqvP0

Hope it helps!
by 505352202
Sun Nov 08, 2020 9:34 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8812
Views: 1496174

Re: Post All Chemistry Jokes Here

Logan Wiedemann 3J wrote:Two atoms are walking down the street. One atom says to the other, "Hey! I think I lost an electron!" The other asks, "Are you sure?" "Yes, I'm positive!"

Lose and electron? Gotta keep an ion it.
by 505352202
Sun Nov 08, 2020 9:28 am
Forum: Ionic & Covalent Bonds
Topic: atomic radius
Replies: 7
Views: 49

Re: atomic radius

Jasmine Ho 2H wrote:I believe neighboring atoms just means 2 of the same atoms that are directly next to each other with no space in between.

I don't think they have to be the same atoms, or do they?
by 505352202
Sun Nov 08, 2020 9:24 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: F orbitals?
Replies: 21
Views: 136

Re: F orbitals?

I also remember him saying in lecture not to worry about f orbitals and that we would focus primarily on s,p, and d orbitals. I wonder why he gave us a problem with an f orbital if we didn't need to "worry about it."
by 505352202
Sun Nov 08, 2020 9:21 am
Forum: Lewis Structures
Topic: Expanded octet
Replies: 4
Views: 21

Re: Expanded octet

No, we don't always make expanded octets even if they are possible on our lewis structure. Sulfur was the example given in the lecture, but other elements with an expanded octet include Chlorine, Silicon, and Phosphorus. All these elements contain d-orbitals, and that's why they can have more than 8...
by 505352202
Sun Nov 08, 2020 9:15 am
Forum: Student Social/Study Group
Topic: Studying From Home
Replies: 91
Views: 597

Re: Studying From Home

I like to study outside and get some sunlight. It easy to forget about breaks and your health when you have multiple classes to worry about. I take multiple mental breaks when I study, and sometimes when things are not clicking, I go for a walk/jog to clear my mind before coming back to the problem.
by 505352202
Sun Nov 08, 2020 9:03 am
Forum: Ionic & Covalent Bonds
Topic: Octet rule exceptions
Replies: 15
Views: 77

Re: Octet rule exceptions

Sulfur is also part of this group of exceptions. It can hold 10 electrons, and that is why we refer to it as an expanded octet.
by 505352202
Wed Oct 28, 2020 9:08 pm
Forum: Properties of Light
Topic: Midterm
Replies: 42
Views: 390

Re: Midterm

Does anyone know when we will get our exam results? And will the scores be curved? I believe we get our scores after all discussion sections have taken it and the exams closes, which is Friday - so, we should get our results by the end of the day on Friday. The course isn't curved, so I don't think...
by 505352202
Wed Oct 28, 2020 9:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Way to search posts for similarity?
Replies: 9
Views: 68

Re: Way to search posts for similarity?

Using the search bar is the easiest way for me.
by 505352202
Wed Oct 28, 2020 9:00 pm
Forum: Significant Figures
Topic: 0's
Replies: 21
Views: 205

Re: 0's

So if we wanted to write 20.00 in scientific notation taking into account sig figs would it be 2.000 x 10^1? I thought trailing zeros were not significant
by 505352202
Wed Oct 28, 2020 8:48 pm
Forum: Student Social/Study Group
Topic: Lavelle's Jokes
Replies: 18
Views: 252

Re: Lavelle's Jokes

Lose an electron? Gotta keep an ion it.
by 505352202
Wed Oct 28, 2020 8:44 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 2 and Final
Replies: 9
Views: 98

Re: Midterm 2 and Final

It does not say anything regarding this on the syllabus unless I missed it. I really hope the second midterm and final are not cumulative. That would be too many topics to remember.
by 505352202
Wed Oct 28, 2020 8:39 pm
Forum: Administrative Questions and Class Announcements
Topic: Audio-Visual Focus Topics
Replies: 14
Views: 103

Re: Audio-Visual Focus Topics

Can he maybe post videos that are shorter and have fewer questions on the assessments? They helped me so much with my studying for the midterm, especially because you could go at your own pace and rewatch/rewind them if you missed something. I hope he considers continuing this resource.
by 505352202
Wed Oct 28, 2020 8:29 pm
Forum: Properties of Light
Topic: Midterm
Replies: 42
Views: 390

Re: Midterm

Does anyone know when we will get our exam results? And will the scores be curved?
by 505352202
Tue Oct 20, 2020 9:23 pm
Forum: Student Social/Study Group
Topic: How to memorize formulas?
Replies: 4
Views: 28

Re: How to memorize formulas?

You don't have to memorize formulas since they will be provided to us for the exam. I try to see what the information is provided and understand what they are asking for us to solve for, then I try to use/find the equations that use that information we have and go from there.
by 505352202
Tue Oct 20, 2020 9:18 pm
Forum: DeBroglie Equation
Topic: DeBroglie Importance
Replies: 8
Views: 74

Re: DeBroglie Importance

Everything is a wave! This crash course video helped me understand this concept a bit better! https://www.youtube.com/watch?v=qO_W70VegbQ
Hope it helps!
by 505352202
Tue Oct 20, 2020 8:57 pm
Forum: Properties of Light
Topic: Midterm
Replies: 42
Views: 390

Re: Midterm

I had discussion today, and it will be multiple-choice, and you will need to have another device to access zoom as you take the exam since currently, Respondus kicks you out from Zoom when you open the quiz/midterm. You can use your phone as the second device and don't need an additional camera, as ...
by 505352202
Tue Oct 20, 2020 8:53 pm
Forum: Administrative Questions and Class Announcements
Topic: Video Learning Modules?
Replies: 5
Views: 32

Re: Video Learning Modules?

I hope he creates more modules for us to watch, as well. They are really useful!
by 505352202
Tue Oct 20, 2020 8:51 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Standard sig figs?
Replies: 3
Views: 32

Re: Standard sig figs?

What about when we use known constants to solve for an answer, like for example c=3.0x10^8. Should we then have our final answer with only one sig figure or should we ignore that and follow the number of sig figs that the numbers provided to us in the problem have?
by 505352202
Sun Oct 18, 2020 8:20 am
Forum: Administrative Questions and Class Announcements
Topic: UCLA Store Updates on Ebook/Sapling access card
Replies: 16
Views: 156

Re: UCLA Store Updates on Ebook/Sapling access card

Ryan_Kien_1L wrote:I got my Sapling Access card maybe a week after I ordered mine for shipping, I would shoot them an email if you're getting worried, but I assume you should be able to just walk in and get it.

Thank you!
by 505352202
Sun Oct 18, 2020 8:17 am
Forum: Properties of Light
Topic: Study Advice
Replies: 50
Views: 308

Re: Study Advice

on the same topic, will there be an exam review or practice exams we can use to study?
by 505352202
Thu Oct 15, 2020 12:46 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Format
Replies: 12
Views: 144

Re: Midterm Format

On the same note, what formulas/information will be provided to us, and what are we expected to memorize?
by 505352202
Thu Oct 15, 2020 12:42 pm
Forum: Administrative Questions and Class Announcements
Topic: UCLA Store Updates on Ebook/Sapling access card
Replies: 16
Views: 156

UCLA Store Updates on Ebook/Sapling access card

Hello, has anyone received any updates on their Ebook/Sapling access card from the UCLA Store? I chose the pickup option to get it faster, but I still haven't received any notification.
by 505352202
Thu Oct 15, 2020 12:30 pm
Forum: Photoelectric Effect
Topic: External Camera
Replies: 11
Views: 118

Re: External Camera

no, I believe you can use any external camera that works with your computer. I think you can even use your phone camera for test purposes. "For midterms and final, joining the Zoom proctoring session using your cell phone is another option. The student needs to make sure they have Zoom set up o...
by 505352202
Sat Oct 10, 2020 9:08 pm
Forum: SI Units, Unit Conversions
Topic: Unit Rounding
Replies: 11
Views: 79

Re: Unit Rounding

RULES FOR ROUNDING OFF: • DO IT AT END OF CALCULATION IN ONE STEP • IF LAST DIGIT IS ABOVE 5: ROUND UP (2 sf then 2.36 is 2.4) • IF LAST DIGIT IS BELOW 5: ROUND DOWN (1sf then 2.36 is 2) • IF LAST DIGIT IS 5: ROUND TO NEAREST EVEN NUMBER (2 sf then 2.35 is 2.4 and 2.65 is 2.6) Note: Round to the nea...
by 505352202
Sat Oct 10, 2020 9:06 pm
Forum: SI Units, Unit Conversions
Topic: Unit Rounding
Replies: 11
Views: 79

Re: Unit Rounding

I usually don't round either. I keep the true values saved on my calculator to get the most accurate answer. I round until the very last step, usually to the number of places that the numbers on the problem used (to be consistent).
by 505352202
Wed Oct 07, 2020 9:31 pm
Forum: Molarity, Solutions, Dilutions
Topic: Dilution and Moles of Solutes
Replies: 4
Views: 40

Re: Dilution and Moles of Solutes

Maybe it helps if you think of it like this: diluting means to add a liquid or another solvent but not more solute (or what is being dissolved) that is why the moles don't change
by 505352202
Mon Oct 05, 2020 3:16 pm
Forum: Molarity, Solutions, Dilutions
Topic: Units for Dilution Equation [ENDORSED]
Replies: 23
Views: 216

Re: Units for Dilution Equation [ENDORSED]

DMaya_3C wrote:I noticed on the example in today's lecture that he keeps writing mol. L^-1. We can just write mol/L when completing a problem with the M1V1 = M2V2 equation right?



Yes, you can write it either way. They mean the same thing. It's just different notation.
by 505352202
Mon Oct 05, 2020 11:30 am
Forum: Balancing Chemical Reactions
Topic: Law of Conservation?
Replies: 16
Views: 152

Re: Law of Conservation?

Chemical equations obey the law of conservation of mass (matter cannot be created or destroyed). That is why we balance the equation to get the same number of atoms of each element on each side of a chemical equation. I think you might be confusing it with the number of moles.

Hope this helps!

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