Search found 35 matches

by BeylemZ-4A
Wed Nov 20, 2019 4:13 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: T-Shaped ??
Replies: 9
Views: 54

T-Shaped ??

What are the VSEPR formulas (e.g. AX2E) for the two different types of molecules that are T-Shaped?
by BeylemZ-4A
Wed Nov 20, 2019 4:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.25
Replies: 3
Views: 13

Re: 2E.25

The question is: Draw the Lewis structure and predict whether each of the following molecules is polar or nonpolar. The molecule I am confused about is CH2Cl2 because I put the two hydrogens on opposite sides of the carbon atom and the two chlorines on the other two sides on the carbon, which cance...
by BeylemZ-4A
Wed Nov 20, 2019 3:36 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: electron cloud distortion
Replies: 3
Views: 24

Re: electron cloud distortion

to add to the person above, the highly polarizable atom is typically a very large anion. when polarizability is high, typically it means the anion is extremely large, with electrons distant to the nucleus. When you mix a very large anion with a very small highly charged cation, you get strong forces...
by BeylemZ-4A
Wed Nov 20, 2019 3:33 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: polarizability
Replies: 4
Views: 17

Re: polarizability

to add on, typically, the larger the molecule, the larger the polarizability. this is because the electrons are farther away from the nucleus and the valence electrons are more shielded from the pulling power of the nucleus.
by BeylemZ-4A
Wed Nov 20, 2019 3:30 pm
Forum: Sigma & Pi Bonds
Topic: Resonance and Sigma/Pi Bonds
Replies: 2
Views: 24

Re: Resonance and Sigma/Pi Bonds

Typically, you look at the molecule as a whole when describing pi and sigma bonds. So every resonance structure would have the same number of sigma and pi bonds. But as the response above has stated, I would just draw in the specific pi and sigma bonds for each resonance structure if a test or homew...
by BeylemZ-4A
Wed Nov 20, 2019 3:23 pm
Forum: Octet Exceptions
Topic: Antioxidants
Replies: 9
Views: 44

Re: Antioxidants

Rita Chen 1C wrote:What happens to the antioxidants afterward?

Afterwards, the antioxidants are simply excreted from the body! typically in the form of urination
by BeylemZ-4A
Wed Nov 20, 2019 3:20 pm
Forum: Resonance Structures
Topic: Bond length
Replies: 4
Views: 19

Re: Bond length

Also keep in mind that bond length has an inversely proportional relationship with bond strength.

As bond length increases, bond strength decreases. (vice versa)
by BeylemZ-4A
Fri Nov 01, 2019 3:18 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizing Power: Size vs. Charge
Replies: 4
Views: 273

Re: Polarizing Power: Size vs. Charge

So revisiting the original question, does one play a more significant role than the other (size or charge?). If so, why?
by BeylemZ-4A
Fri Nov 01, 2019 3:17 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability
Replies: 3
Views: 18

Re: Polarizability

can someone explain why the size of the cation plays a role in how polarizing it can be?
by BeylemZ-4A
Fri Nov 01, 2019 3:13 pm
Forum: Octet Exceptions
Topic: 2C.5
Replies: 4
Views: 39

Re: 2C.5

First, I just set up the molecule as described in the problem. From there, I added all of the 22 other electrons onto the atoms to give them octets. At first I gave Cl 6 free electrons, Oxygen 4, Nitrogen 0 and each of the oxygens 6. However, with this setup, nitrogen didn't have an octet. So, I mo...
by BeylemZ-4A
Fri Nov 01, 2019 3:11 pm
Forum: Octet Exceptions
Topic: 2C.9
Replies: 4
Views: 28

Re: 2C.9

If your lewis structure is correct, there will be a double bond between Xe and O, single bonds between each F and the Xe, and a lone pair on the central atom, Xe. Now you take the equation for formal charge = V - (L + 1/2*B) Since Xe is in the very last group it has a value of V = 8. There are 2 lon...
by BeylemZ-4A
Fri Nov 01, 2019 3:03 pm
Forum: Dipole Moments
Topic: van der waal
Replies: 4
Views: 44

Re: van der waal

are we supposed to know this already??? This type of bonding was just touched on in lecture recently, so its ok if youre not extremely familiar with it. These four types of interactions are all pretty much the same if I am not mistaken: 1. dispersion = 2. induced dipole - induced dipole = 3. London...
by BeylemZ-4A
Fri Nov 01, 2019 3:00 pm
Forum: Ionic & Covalent Bonds
Topic: Distorted e- with Ionic Bonds
Replies: 5
Views: 29

Distorted e- with Ionic Bonds

Can someone explain how the anions distortion somehow makes the ionic bond now have covalent characteristics?
by BeylemZ-4A
Mon Oct 21, 2019 4:27 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity
Replies: 4
Views: 30

Electron Affinity

Can someone describe the trends in the periodic table referring to Electron Affinity? I understand that it is the energy released when an electron is added, but i do not quite understand how i would be able to qualitatively decide which elements have a higher E(ea) value.
by BeylemZ-4A
Mon Oct 21, 2019 4:24 pm
Forum: Trends in The Periodic Table
Topic: 1st and 2nd Ionization
Replies: 5
Views: 41

Re: 1st and 2nd Ionization

What is the difference between 1st ionization energy and second ionization energy? As discussed in a previous lecture, removing a second electron always requires more energy than removing the first electron. looking at this example of Copper: Cu(g) --> Cu+(g) and e-(g) with a first ionization energ...
by BeylemZ-4A
Mon Oct 21, 2019 4:19 pm
Forum: Quantum Numbers and The H-Atom
Topic: Electron spin
Replies: 5
Views: 37

Re: Electron spin

What is the significance of the direction in which an electron spins? the directions an electron spins is merely for the purpose of qualitatively analyzing. the "spin up" and "spin down" don't literally mean the electrons are spinning in a clockwise or counterclockwise direction...
by BeylemZ-4A
Mon Oct 21, 2019 4:12 pm
Forum: Quantum Numbers and The H-Atom
Topic: f- orbitals?
Replies: 4
Views: 21

f- orbitals?

in lecture, lavelle really only said we needed to be familiar with s, p, and d blocks when writing electron configurations . but in homework problem 1D.21 part C, the answer was in terms of the f orbital. do we still only need to know the s, p, and d blocks, or should i familiarize myself with "...
by BeylemZ-4A
Mon Oct 21, 2019 4:12 pm
Forum: Quantum Numbers and The H-Atom
Topic: f- orbitals?
Replies: 7
Views: 36

f- orbitals?

in lecture, lavelle really only said we needed to be familiar with s, p, and d blocks when writing electron configurations . but in homework problem 1D.21 part C, the answer was in terms of the f orbital. do we still only need to know the s, p, and d blocks, or should i familiarize myself with "...
by BeylemZ-4A
Mon Oct 21, 2019 4:05 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Homework Question 1E.9
Replies: 3
Views: 34

Homework Question 1E.9

Can someone explain to me why the quantum numbers for 1E.9 part B are not possible? I understand part A and C, but something about B is really throwing me off.
Thanks so much!
by BeylemZ-4A
Fri Oct 18, 2019 3:32 pm
Forum: *Black Body Radiation
Topic: Will this concept be tested
Replies: 8
Views: 404

Re: Will this concept be tested

nicknavejas1B wrote:I heard Professor Lavelle mention that we wont need to prepared to be tested on this concept, can anyone confirm?

it will not be tested, but i read over it in the textbook because i feel the information provided was interesting, yet very confusing.
by BeylemZ-4A
Fri Oct 18, 2019 3:29 pm
Forum: Trends in The Periodic Table
Topic: Bond Lenghts
Replies: 7
Views: 371

Re: Bond Lenghts

Rithana Srikanth 3L wrote:I think you would have to draw the Lewis structure to figure it out.


do we need to know how to draw lewis structures for our test over the quantum world?
I would need to brush up on that (even though it is literally so simple haha)
by BeylemZ-4A
Fri Oct 18, 2019 3:24 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: removing electrons
Replies: 5
Views: 212

Re: removing electrons

You always remove electrons from the highest energy orbital As an example, you would remove electrons from 4p before you would pull from 4s.
by BeylemZ-4A
Fri Oct 18, 2019 3:21 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: how to prepare
Replies: 22
Views: 103

Re: how to prepare

I'm really stressed out right now. The textbook is a lot of information with lots of formulas to know. Any advice for understanding the material better & to help me feel more prepared & confident? if you are referring to the section in the textbook 1D that has the chart of all the formulas,...
by BeylemZ-4A
Mon Oct 14, 2019 6:00 pm
Forum: *Shrodinger Equation
Topic: More Modules coming?...
Replies: 3
Views: 34

More Modules coming?...

Does anyone know if Dr. Lavelle will be uploading any further modules on the rest of the Quantum Unit? I find them extremely helpful and would love to have more.
by BeylemZ-4A
Wed Oct 09, 2019 3:25 pm
Forum: Properties of Light
Topic: Light intensity
Replies: 6
Views: 41

Re: Light intensity

McKenna_4A wrote:When Dr. Lavelle states that light can be at "higher intensity," what does this mean with respect to wave properties?

Intensity can be found mathematically too! Intensity = (Amplitude)^2 if i am not mistaken.
by BeylemZ-4A
Wed Oct 09, 2019 3:23 pm
Forum: Einstein Equation
Topic: Numbers to memorize [ENDORSED]
Replies: 37
Views: 997

Re: Numbers to memorize [ENDORSED]

On tests (for Dr.Lavelle and I am sure all other professors) you are given both a formula chart AND periodic table to assist you.
by BeylemZ-4A
Wed Oct 09, 2019 3:21 pm
Forum: DeBroglie Equation
Topic: Units for DeBroglie
Replies: 4
Views: 52

Re: Units for DeBroglie

Yes! definitely would need to change from km*g to m*kg!! thanks to metric conversions the dimensional analysis is quite straightforward.
by BeylemZ-4A
Wed Oct 09, 2019 3:20 pm
Forum: DeBroglie Equation
Topic: How to know which equation to use
Replies: 9
Views: 102

Re: How to know which equation to use

When trying to find the velocity of an object, how do you know whether to use the equation v=c/(wavelength) or v=h/(mass x wavelength)? the "v" is not in reference to velocity as it would be in Physics. the "v" is the frequency of the light!! definitely a distinction that needs ...
by BeylemZ-4A
Wed Oct 09, 2019 3:15 pm
Forum: *Black Body Radiation
Topic: Black Bodies and Temperature
Replies: 2
Views: 247

Re: Black Bodies and Temperature

i think WHAT happens was explained, but i am still not understanding exactly WHY the temperature is seen to increase. Can anyone explain to me in a different light what is going on here?
by BeylemZ-4A
Wed Oct 09, 2019 3:12 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation [ENDORSED]
Replies: 70
Views: 981

Re: Rydberg equation [ENDORSED]

The rydberg equation, if i am correct, is derived from Bohr's equation. Dr. Lavelle prefers to use Bohr's over the Rydberg equation though.
by BeylemZ-4A
Wed Oct 02, 2019 3:21 pm
Forum: Properties of Light
Topic: Amplitude? [ENDORSED]
Replies: 8
Views: 66

Amplitude? [ENDORSED]

Can someone explain to me in more detail what amplitude is? I was not quite sure when it was explained in class.
by BeylemZ-4A
Wed Oct 02, 2019 3:20 pm
Forum: Empirical & Molecular Formulas
Topic: Mass Percent Composition
Replies: 5
Views: 46

Re: Mass Percent Composition

You only have to imagine there is 100 grams when %composistion is given but not the mass. (the number of grams you used is not fixed, you can use whatever you want as long as you keep the calculation simple and clear, but usually, 100 grams is the most straightforward and simple) I definitely agree...
by BeylemZ-4A
Wed Oct 02, 2019 3:18 pm
Forum: Properties of Light
Topic: Colors and Frequency
Replies: 14
Views: 523

Re: Colors and Frequency

I believe that is would be helpful to know the two opposing ends of the spectrum, with red and blue light, and where they fall into the entire Electromagnetic spectrum.
by BeylemZ-4A
Wed Oct 02, 2019 3:16 pm
Forum: Properties of Light
Topic: electromagnetic field and magnetic field
Replies: 3
Views: 37

Re: electromagnetic field and magnetic field

If i am not mistaken, the electric field no and magnetic field are perpendicular in a 3 dimensional space.
by BeylemZ-4A
Wed Oct 02, 2019 3:13 pm
Forum: Significant Figures
Topic: Sig Fig Decimal
Replies: 10
Views: 76

Re: Sig Fig Decimal

Does that mean 114.0 would be 4 sig figs?

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