Search found 31 matches

by Jeremy Wei 2K
Mon Nov 23, 2020 5:19 pm
Forum: Electronegativity
Topic: determining electronegativity
Replies: 30
Views: 208

Re: determining electronegativity

The trend in the periodic table is that electronegativity increases left to right in periods / top to bottom in groups!
by Jeremy Wei 2K
Mon Nov 23, 2020 5:16 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: Vapor pressure
Replies: 2
Views: 9

Re: Vapor pressure

Vapor pressure I believe is correlated with evaporation rate (higher vapor pressure indicates higher evaporation rate), so stronger intermolecular forces would result in a lower vapor pressure, since the stronger forces would make it harder for the substance to vaporize.
by Jeremy Wei 2K
Mon Nov 23, 2020 5:05 pm
Forum: Bond Lengths & Energies
Topic: Covalent Bond Length
Replies: 13
Views: 58

Re: Covalent Bond Length

Hi, bond length is affected by the atomic radius size, electronegativity, and whether it is a single/double/triple bond.
by Jeremy Wei 2K
Mon Nov 23, 2020 5:03 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Optimal Formal Charge Configuration
Replies: 3
Views: 18

Re: Optimal Formal Charge Configuration

Hi, the more electronegative atom should get the negative formal charge and the less electronegative atom should get the positive formal charge, as that would make the molecule more stable.
by Jeremy Wei 2K
Mon Nov 23, 2020 5:00 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 23
Views: 68

Re: Polarity

Polar bonds form due to the difference in electronegativities between the atom but these bonds can cancel out due to the orientation of the molecule as a whole.
by Jeremy Wei 2K
Mon Nov 23, 2020 4:54 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Oxidations Numbers
Replies: 4
Views: 27

Re: Oxidations Numbers

Thanks for the explanation! He didn't go over it really and I was also stuck on oxidation numbers.
by Jeremy Wei 2K
Mon Nov 23, 2020 4:50 pm
Forum: Electronegativity
Topic: How to memorize
Replies: 6
Views: 31

Re: How to memorize

I think for this class we dont necessarily need to memorize the actual electronegativity numerical values, but just the trends in electronegativity in elements. So just how electronegativity increases left to right in periods / top to bottom in groups and how electronegativity is generally greater i...
by Jeremy Wei 2K
Mon Nov 23, 2020 4:36 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Best Formal Charge Equations
Replies: 23
Views: 68

Re: Best Formal Charge Equations

Hi, for formal charge I also use the lines/dots way FC = valence electrons - # dots - # bonds/lines since it gives me more of a visual picture that helps me with picturing the charge.
by Jeremy Wei 2K
Mon Nov 23, 2020 4:33 pm
Forum: Octet Exceptions
Topic: Expansion for 3s?
Replies: 2
Views: 12

Re: Expansion for 3s?

Hi, I'm pretty sure that atoms with 3s valence e- can't expand into 3d for ground state. I think the expanded octet concept mostly applies to the p-orbital if I'm not wrong.
by Jeremy Wei 2K
Sat Nov 14, 2020 10:50 am
Forum: Resonance Structures
Topic: Delocalized Electrons
Replies: 7
Views: 21

Re: Delocalized Electrons

Hi, delocalized electrons from what I know are electrons that are not just shared between a pair of atoms, but can be found in different positions (resonance).
by Jeremy Wei 2K
Sun Nov 08, 2020 12:49 am
Forum: Ionic & Covalent Bonds
Topic: Atomic Radius
Replies: 38
Views: 141

Re: Atomic Radius

Hi, the atomic radius in the top right is related to the complete octet of the elements because as the octet starts to fill up, there are more valence electrons for the protons in the nucleus to interact with, the attraction being stronger.
by Jeremy Wei 2K
Sun Nov 01, 2020 3:55 pm
Forum: Administrative Questions and Class Announcements
Topic: Participation Points [ENDORSED]
Replies: 62
Views: 888

Re: Participation Points [ENDORSED]

I was also wondering the same, thanks for clarifying!
by Jeremy Wei 2K
Sun Nov 01, 2020 3:53 pm
Forum: Quantum Numbers and The H-Atom
Topic: wavelength
Replies: 13
Views: 43

Re: wavelength

Hi, because wavelength is a measure of the distance between two adjacent points in a wave, wavelength can't be negative. Hope it helps!
by Jeremy Wei 2K
Sun Nov 01, 2020 3:50 pm
Forum: Trends in The Periodic Table
Topic: Atomic Radius
Replies: 30
Views: 331

Re: Atomic Radius

Hi, the atomic radius decreases as you go across the period from left to right because of the increase in valence electrons, while it increases when you go down the groups because there's more subshells. Hope this helps!
by Jeremy Wei 2K
Sat Oct 31, 2020 8:49 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Sapling Homework
Replies: 8
Views: 53

Re: Sapling Homework

Hi, that electron configuration looks correct but I'd say maybe take out the commas and spaces? You can also try writing the full electron configuration if that doesn't work. Hope you figure it out!
by Jeremy Wei 2K
Sat Oct 31, 2020 8:44 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 4s and 3d
Replies: 14
Views: 60

Re: 4s and 3d

Hi, so in this case 3d comes first because the 3d orbital has lower energy when compared to the 4s orbital. Hope this helps! This is one of the main exceptions talked about because it seems out of order.
by Jeremy Wei 2K
Sun Oct 25, 2020 7:12 pm
Forum: *Black Body Radiation
Topic: What is Black Body?
Replies: 35
Views: 478

Re: What is Black Body?

Hi, Lavelle went over this briefly during lecture, but essentially black body is a theoretical concept where a material would absorb all forms of wavelengths/frequencies of EM radiation, making it appear "black" (it would be invisible to our eyes).
by Jeremy Wei 2K
Sun Oct 25, 2020 7:08 pm
Forum: Properties of Light
Topic: Light spectrum
Replies: 8
Views: 54

Re: Light spectrum

Hi, like everyone has said above, because the wavelengths aren't provided on the constants sheet it's a good idea to memorize at least the general order of wavelengths associated with the EM radiation. Probably wouldn't hurt to know the wavelengths outside the visible light spectrum as well.
by Jeremy Wei 2K
Sun Oct 25, 2020 6:06 pm
Forum: Photoelectric Effect
Topic: Mass of atoms
Replies: 18
Views: 92

Re: Mass of atoms

Hi, when using mass of electrons or protons or whatever you’d be using the standard SI units in the problem so yes, you’ll be using kg. Also Lavelle sent out a constants sheet with all the masses that you’ll be able to use on the exam so no need to memorize them!
by Jeremy Wei 2K
Sun Oct 25, 2020 5:00 pm
Forum: Properties of Electrons
Topic: intensity vs energy
Replies: 24
Views: 124

Re: intensity vs energy

Hi, personally I think this statement is false as it doesn’t take into account the different views on light. On the quantum view, increasing the intensity does not increase the energy of the individual protons (you’d have to increase frequency in order to do that)
by Jeremy Wei 2K
Sat Oct 24, 2020 1:07 am
Forum: DeBroglie Equation
Topic: Practice Problem
Replies: 7
Views: 44

Re: Practice Problem

Hi, just make sure to read the problem very carefully and make note of the units you are working with before you start. For this problem, make sure you convert the mass into kg and convert the final answer wavelength to nm (as the problem asks). Also it's useful to include units while you're solving...
by Jeremy Wei 2K
Fri Oct 23, 2020 11:04 pm
Forum: Properties of Light
Topic: Wavelength
Replies: 14
Views: 58

Re: Wavelength

Hi, even though the SI units is meters, I normally would convert my final answer to nm. I think when it comes to the final answer, either m or nm should be fine (I don't think you'll be penalized if you use either). It's just that make sure use meters for wavelength while you're solving for the answ...
by Jeremy Wei 2K
Sat Oct 17, 2020 2:17 pm
Forum: Einstein Equation
Topic: m vs nm
Replies: 66
Views: 350

Re: m vs nm

Either should be fine as long as the conversions are done correctly, but personally I prefer to use nm in my final answer.
by Jeremy Wei 2K
Sat Oct 17, 2020 2:12 pm
Forum: Administrative Questions and Class Announcements
Topic: Built-in webcams/Equipment request [ENDORSED]
Replies: 22
Views: 698

Re: Built-in webcams/Equipment request [ENDORSED]

Hi, you can just use a second device like a phone or iPad if you have one that you can use to show your workspace. That way you don't have to spend extra money and buy an external separate external webcam!
by Jeremy Wei 2K
Sat Oct 17, 2020 2:08 pm
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 196
Views: 829

Re: How are you studying?

Hi, personally I find just doing the textbook review questions to be very helpful as well as taking notes on the Audio-Visual Focus-Topics modules + the assessments are very useful too. Good luck!
by Jeremy Wei 2K
Sat Oct 17, 2020 2:04 pm
Forum: Significant Figures
Topic: Sig Figs and Constants on Exams
Replies: 9
Views: 79

Re: Sig Figs and Constants on Exams

Hi, I think it should be fine to round the constants (just not too much) as long as you keep the proper sig figs for the answer. I don't think it'll make that much of a difference :)
by Jeremy Wei 2K
Sat Oct 10, 2020 2:49 pm
Forum: Limiting Reactant Calculations
Topic: Best way to find limiting reactant
Replies: 5
Views: 74

Re: Best way to find limiting reactant

Hi! For me personally, I find myself using the first method (the one Lavelle used) much more often because I think it's simpler and easier to understand. But I think just use whatever method works best for you! Both ways lead to the answer, so I think it's just based on personal preference.
by Jeremy Wei 2K
Sat Oct 10, 2020 2:38 pm
Forum: Significant Figures
Topic: How many significant figures are in 7.00 x 10^2?
Replies: 25
Views: 517

Re: How many significant figures are in 7.00 x 10^2?

Hi! 700 only has 1 sig fig because there is no decimal but since 7.00 x 10^2 has a decimal with two trailing zeros behind it (zeros behind decimals are considered significant) it would have 3 sig figs.
by Jeremy Wei 2K
Thu Oct 08, 2020 11:56 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 221
Views: 116095

Re: Advice from a Medical Student [ENDORSED]

Ashley thank you so much for sharing your experiences and for your advice! Do you have any tips/strategies on how to study that helped you for this class?
by Jeremy Wei 2K
Thu Oct 08, 2020 11:41 pm
Forum: Significant Figures
Topic: Sig Figs for Molar Mass
Replies: 14
Views: 82

Re: Sig Figs for Molar Mass

Hi I normally would use 4 sig figs for the molar masses unless the problem includes specific molar masses (with different sig figs) for you to use.
by Jeremy Wei 2K
Tue Oct 06, 2020 8:56 pm
Forum: SI Units, Unit Conversions
Topic: Including the units when solving
Replies: 8
Views: 62

Re: Including the units when solving

Hi it's definitely helpful to include units during calculations especially problems that have a lot of conversions since you can follow your work step-by-step by I don't think it's required, just something you can use as a guide as you're solving.

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