Search found 50 matches

by Jagveer 2L
Wed Dec 02, 2020 1:32 pm
Forum: Hybridization
Topic: Pi Bonds Cannot Rotate
Replies: 7
Views: 25

Re: Pi Bonds Cannot Rotate

To add on, for the molecule to rotate about the double bond, the π-bond would need to break and then reform. It is not possible for a π-bond to remain intact and rotate.
by Jagveer 2L
Wed Dec 02, 2020 1:13 pm
Forum: Administrative Questions and Class Announcements
Topic: UA vs Step-Up Sessions [ENDORSED]
Replies: 2
Views: 17

Re: UA vs Step-Up Sessions [ENDORSED]

Both UA and step-up sessions are great ways to get extra help and practice, but step-up sessions are more detailed and slower paced than UA sessions. If you need more help in understanding a concept, step-up sessions are recommended since they go step by step through explanations.
by Jagveer 2L
Mon Nov 30, 2020 1:43 pm
Forum: Naming
Topic: Textbook 9C.3
Replies: 3
Views: 19

Re: Textbook 9C.3

Yes you are correct that prefixes are not taken into account when looking at alphabetical order, so we can ignore tetra and di. Since it is ammine and aqua and m comes before q in the alphabet, ammine is before aqua. Hope this helps.
by Jagveer 2L
Mon Nov 30, 2020 1:27 pm
Forum: Hybridization
Topic: Pi Bonds break
Replies: 8
Views: 33

Re: Pi Bonds break

In the textbook it was mentioned that for a molecule to rotate about the double bond, the π-bond would need to first break and then re-form. So, I believe that this is the only way that the central atom can rotate with π-bonds.
by Jagveer 2L
Mon Nov 30, 2020 1:19 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: polydentate
Replies: 4
Views: 19

Re: polydentate

Just to add on, a polydentate is a ligand that can attatch to more than one binding site simultaneously and the prefix used is bis-, tris-, or tetrakis- to define that polydentate. An example of a polydentate is bidentate ethylenediamine, where each end of the molecule has a nitrogen atom with a lon...
by Jagveer 2L
Mon Nov 23, 2020 5:14 pm
Forum: Significant Figures
Topic: 40. versus 40
Replies: 23
Views: 60

Re: 40. versus 40

Yes, the decimal point makes the first one 2 sig figs and the lack of it makes the second one one sig fig.
by Jagveer 2L
Mon Nov 23, 2020 5:02 pm
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: Relation to type of bond
Replies: 3
Views: 12

Re: Relation to type of bond

Yes, generally the stronger the intermolecular forces are, the higher the surface tension is.
by Jagveer 2L
Mon Nov 23, 2020 3:55 pm
Forum: Electronegativity
Topic: How is electronegativity calculated?
Replies: 4
Views: 29

Re: How is electronegativity calculated?

I found this information in the textbook under topic 2D. The electronegativity is the average of the ionization energy (I) and electron affinity (E_a) of the element. So, the formula given was X=(1/2)(I+E_a). Hope this helps.
by Jagveer 2L
Mon Nov 23, 2020 12:53 pm
Forum: Administrative Questions and Class Announcements
Topic: Thanksgiving Lectures
Replies: 1
Views: 51

Re: Thanksgiving Lectures

I think that we will have a lecture on Friday since we had lecture on Veteran's day, but I am not completely sure on that. For discussion sections, it is probably best to email your TA and check in with them to see what their plans are.
by Jagveer 2L
Mon Nov 23, 2020 12:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Why is CH2Cl2 polar?
Replies: 6
Views: 34

Re: Why is CH2Cl2 polar?

CH2Cl2 is polar because Cl is more electronegative than H, therefore pulling the electrons towards it. Since the electrons are not shared equally by the atoms, there is a dipole moment that does not cancel and therefore the molecule is polar. On the other hand, CH4 is nonpolar because all of the bon...
by Jagveer 2L
Wed Nov 18, 2020 1:50 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizing Power/Polarizability Trend?
Replies: 4
Views: 19

Re: Polarizing Power/Polarizability Trend?

Professor Lavelle has not taught us about any polarizability trends, but the general rule is that the bigger the molecule, the bigger the polarizability. So, I would assume that the polarizability trend would be similar to the trend of atomic radius, decreasing across a period and increasing down a ...
by Jagveer 2L
Tue Nov 17, 2020 10:16 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E.5 b
Replies: 2
Views: 18

Re: 1E.5 b

Yes you are correct. The electrons in the s-orbital are very close to the nucleus, which is why they are able to penetrate through the inner shells. On the other hand, electrons in the p-orbital do not penetrate the nucleus as much as electrons in the s-orbital because they have orbital angular mome...
by Jagveer 2L
Tue Nov 17, 2020 10:10 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability and Polarizing Power
Replies: 5
Views: 24

Re: Polarizability and Polarizing Power

Polarizability is the ability to which a species of electrons can be distorted. If they can be easily distorted, they have a higher polarizability. Polarizability depends on the size of the molecule and therefore the number of electrons. The less tightly the electrons are held, the more polarizable ...
by Jagveer 2L
Mon Nov 16, 2020 4:45 pm
Forum: Student Social/Study Group
Topic: Favorite TV shows
Replies: 142
Views: 488

Re: Favorite TV shows

I have recently started watching Superstore and it is very funny and reminded me of The Office.
by Jagveer 2L
Mon Nov 16, 2020 4:40 pm
Forum: General Science Questions
Topic: midterm 2
Replies: 6
Views: 62

Re: midterm 2

There is no designated review session, but worksheets and other resources have been posted that are helpful review materials.
by Jagveer 2L
Mon Nov 16, 2020 4:31 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Homework 1D #5
Replies: 2
Views: 20

Re: Homework 1D #5

We are not expected to know that. The questions on the midterm are going to be modeled after the problems given in the syllabus and 1D#5 was not on the syllabus, so I do not think that we will be quizzed on it.
by Jagveer 2L
Sat Nov 14, 2020 1:23 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8245
Views: 1440238

Re: Post All Chemistry Jokes Here

What should you do is no one laughs at your chemistry jokes?
Keep telling them until you get a reaction.
by Jagveer 2L
Fri Nov 13, 2020 2:26 am
Forum: Student Social/Study Group
Topic: Studying From Home
Replies: 91
Views: 293

Re: Studying From Home

I have lots of distractions at home, so the best way that I can study from home is to completely isolate myself. I take only the things I need for schoolwork and head to my room and do my work. I also occasionally take breaks so that I do not burn myself out.
by Jagveer 2L
Fri Nov 13, 2020 2:23 am
Forum: Student Social/Study Group
Topic: grade worries
Replies: 100
Views: 623

Re: grade worries

I am also worried about my grade and I am not feeling as confident for this midterm, but I am constantly calculating my grade and this kind of destressed me. The final will probably be the most stressful since all of the other grades are final and our total grade solely depends on how we perform on ...
by Jagveer 2L
Fri Nov 13, 2020 2:13 am
Forum: Student Social/Study Group
Topic: Test Anxiety
Replies: 62
Views: 230

Re: Test Anxiety

I always panic whenever I click the start button, so the first thing I do is take a deep breath and then I try to calmly proceed and slow down so that I do not miss something or misread the question. Whenever I do not understand a question I move on and come back to it when I feel ready.
by Jagveer 2L
Mon Nov 02, 2020 8:20 pm
Forum: Administrative Questions and Class Announcements
Topic: Accessing the E-textbook [ENDORSED]
Replies: 58
Views: 6377

Re: Accessing the E-textbook [ENDORSED]

Is purchasing a hard copy of the textbook worth the $190? I have difficulty viewing the textbook well on Sapling's site and like have a physical copy, but it is expensive and if it helps with the exams it would be worth it. I have only used the e-book and it has been working for me, but if you woul...
by Jagveer 2L
Mon Nov 02, 2020 8:03 pm
Forum: Resonance Structures
Topic: Resonance Structure vs Resonance Hybrid
Replies: 2
Views: 32

Re: Resonance Structure vs Resonance Hybrid

I don't think that we have to draw the resonance hybrid for compounds, but we should understand what resonance hybrids are and how resonance structures relate to resonance hybrids. We should draw the resonance structures of compounds because they are easier to draw since we do not have to account fo...
by Jagveer 2L
Mon Nov 02, 2020 7:53 pm
Forum: Empirical & Molecular Formulas
Topic: Review for Midterm
Replies: 11
Views: 110

Re: Review for Midterm

Samin Kabir wrote:When do we get the midterms back?

I have heard that the scores will be released this Thursday, but I do not know if we will be able to see our responses for the midterm.
by Jagveer 2L
Mon Nov 02, 2020 7:50 pm
Forum: Administrative Questions and Class Announcements
Topic: Fall 2020 Midterm 1 Instructions
Replies: 20
Views: 1053

Re: Fall 2020 Midterm 1 Instructions

AlyssaMaynard1C wrote:Will each question be all or nothing for points? Or how could points be awarded if the answer was almost there?

My TA said that partial credit would be given on some questions, but I am not too sure about how many questions have the possibility of partial credit.
by Jagveer 2L
Mon Nov 02, 2020 7:29 pm
Forum: Administrative Questions and Class Announcements
Topic: Participation Points [ENDORSED]
Replies: 62
Views: 909

Re: Participation Points [ENDORSED]

lauren_tran_3J wrote:What is the day/time in PST when participation is counted? Thank you!

Participation is counted on Sunday at 11:59 pm PST.
by Jagveer 2L
Mon Oct 26, 2020 5:19 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: orbitals
Replies: 5
Views: 36

Re: orbitals

The [Ar] is the closest noble gas to Cr that has a lower energy than Cr. He did that so that you do not have to write out the electron configuration up to [Ar], so it was just to save time and make the process easier. He just showed us a different way to write the electron configuration for Cr and h...
by Jagveer 2L
Mon Oct 26, 2020 2:00 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Spectral Lines
Replies: 2
Views: 29

Re: Spectral Lines

The amount of spectral lines corresponds to the amount of transition that an electron goes through. If it is at the n=4 energy level, then it can have three spectral lines since it can transition from that energy level to the 3, 2, or 1 energy levels. So, each transition produces a spectral line.
by Jagveer 2L
Mon Oct 26, 2020 1:54 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm topics and information
Replies: 8
Views: 88

Re: Midterm topics and information

From what my TA told me, the midterm is going to resemble the textbook questions, so I do not think that questions will be specific to the lectures. The lectures cover what the book has, but they contain more examples and Professor Lavelle clarifies what we are expected to know and what we do not ne...
by Jagveer 2L
Mon Oct 26, 2020 1:50 pm
Forum: Administrative Questions and Class Announcements
Topic: Un-Randomize Sapling
Replies: 2
Views: 22

Re: Un-Randomize Sapling

I also tried to un-randomize sapling and I literally clicked all the buttons, but I couldn't figure it out, so maybe implementing this change is on the teacher's end.
by Jagveer 2L
Mon Oct 26, 2020 1:44 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Does 4s or 3d have more energy? Lec 11
Replies: 4
Views: 24

Re: Does 4s or 3d have more energy? Lec 11

3d has less energy than 4s. But, when there are elements that are not in the 3d block and only are in 4s, so calcium and potassium, then we do not write 3d, but when the element is in the 3d block, then we do write the 3d first and then 4s after. Hopefully this helps, but my wording may be a little ...
by Jagveer 2L
Mon Oct 19, 2020 10:04 pm
Forum: Molarity, Solutions, Dilutions
Topic: Photoelectric Effect
Replies: 6
Views: 106

Re: Photoelectric Effect

I am also struggling with this topic in photoelectric effect, is there more review in the book? or is the sapling homework a better resource? The photoelectric effect is mentioned in the book under topic 1B, but I found the audio-visual topics for the photoelectric effect very helpful. This is loca...
by Jagveer 2L
Mon Oct 19, 2020 1:12 pm
Forum: Administrative Questions and Class Announcements
Topic: Question about Midterms
Replies: 9
Views: 83

Re: Question about Midterms

Does anyone know if we'll also be given the wavelengths corresponding to the different regions of the EM spectrum, or will we need to just know it? I think that we might need to remember the wavelengths corresponding to visible light, but that's about it. However, it might be helpful to know the or...
by Jagveer 2L
Mon Oct 19, 2020 1:09 pm
Forum: DeBroglie Equation
Topic: Deriving DeBroglie's Equation and Application to Photons
Replies: 1
Views: 20

Re: Deriving DeBroglie's Equation and Application to Photons

Photons do not have a rest mass, but they do have momentum. So the De Broglie equation does work for photons since they have a momentum and that is the requirement for the equation to apply.
by Jagveer 2L
Mon Oct 19, 2020 1:04 pm
Forum: DeBroglie Equation
Topic: E=pc Equation
Replies: 3
Views: 25

Re: E=pc Equation

He was just trying to show that from E=mc^2, you could get E=pc since p=mv and v=c as you stated, so E=m*c*c, or E=pc.
by Jagveer 2L
Mon Oct 19, 2020 12:50 pm
Forum: DeBroglie Equation
Topic: standing circular wave model
Replies: 7
Views: 80

Re: standing circular wave model

Is the standing circular wave model that shows waves out of phase (picture in lecture slides) inaccurate? Yes, it is inaccurate because that model shows what it would look like if you tried to model the electron in between energy levels, so you will get a circular standing wave that is not stationa...
by Jagveer 2L
Tue Oct 13, 2020 5:05 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Electromagnetic Spectrum
Replies: 5
Views: 25

Re: Electromagnetic Spectrum

I think that we will be provided with the frequencies/wavelengths, but we should probably know the wavelengths of visible light.
by Jagveer 2L
Tue Oct 13, 2020 4:58 pm
Forum: Properties of Light
Topic: Photoelectric Effect
Replies: 3
Views: 31

Re: Photoelectric Effect

For the wave model, the wave's amplitude represents the intensity of the wave, so according to this model, a wave with a higher amplitude has more energy to eject electrons. However, the photoelectric effect does not support this wave model and supports the particle model instead, where light is mad...
by Jagveer 2L
Mon Oct 12, 2020 1:00 pm
Forum: Photoelectric Effect
Topic: Where does photon energy go if it does not emit an electron?
Replies: 6
Views: 67

Re: Where does photon energy go if it does not emit an electron?

In today's lecture professor Lavelle said that if the energy of the photon is not greater than or equal to the threshold energy, then the metal still heats up, but no electrons are emitted. So some of the photon's energy is converted to heat energy.
by Jagveer 2L
Mon Oct 12, 2020 12:41 pm
Forum: Properties of Light
Topic: Changing Intensity vs Changing Wavelength
Replies: 7
Views: 44

Re: Changing Intensity vs Changing Wavelength

Yes, for example, doubling the intensity of the light is doubling the number of photons that make up the light. However, doubling the intensity of the light does not change the energy of the photon, it just changes the number of photons. You are correct about what changing the wavelength means.
by Jagveer 2L
Mon Oct 12, 2020 12:38 pm
Forum: Photoelectric Effect
Topic: How can kinetic energy be 0
Replies: 5
Views: 47

Re: How can kinetic energy be 0

The kinetic energy can be zero if the energy of the photon exactly equals the threshold energy. This would make it so that the electron is emitted, but there is no excess energy, or kinetic energy. Hopefully this helps.
by Jagveer 2L
Sat Oct 10, 2020 11:24 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular formulas for organic chemical structures
Replies: 3
Views: 31

Re: Molecular formulas for organic chemical structures

I also had to search up the formula for the structure and I think that we will be provided with the formula because of where we are in the class right now, but I am not completely sure if we would need to know the formulas in the future for this class.
by Jagveer 2L
Sat Oct 10, 2020 11:12 pm
Forum: Molarity, Solutions, Dilutions
Topic: Photoelectric Effect
Replies: 6
Views: 106

Re: Photoelectric Effect

So for this question they are providing you with the threshold energy, 3.607 x 10^-19 J, and the kinetic energy, 0 J. So using these givens we could solve for the energy of the photon by using the equation E(photon)-E(threshold energy)=kinetic energy, which in this case is just 3.607 x 10^-19. Now y...
by Jagveer 2L
Sat Oct 10, 2020 7:15 pm
Forum: Properties of Light
Topic: photoelectric effect
Replies: 5
Views: 62

Re: photoelectric effect

Yes, the light is acting like it is made up of individual photons instead of acting like a wave and it acts this way for both ineffective and effective light. Also, not all photons are equal, the amount of energy that each individual photon has depends on the light source. The light sources with sho...
by Jagveer 2L
Fri Oct 09, 2020 8:14 pm
Forum: Properties of Light
Topic: photoelectric effect
Replies: 5
Views: 62

Re: photoelectric effect

That is a great question. In the photoelectric experiment they observed that increasing the intensity of the light did not eject electrons and they concluded that light was not acting like a wave. Instead it was acting like it was made of individual photons, where the individual photon's energy must...
by Jagveer 2L
Wed Oct 07, 2020 7:14 pm
Forum: Administrative Questions and Class Announcements
Topic: How to find my posts
Replies: 78
Views: 49096

Re: How to find my posts

Hi Jamie, I feel the same way and I am gradually getting used to the format of this website and one thing that helped me skip a couple of steps when I want to click on a recent post is to go over to the right side of the home page where the last post is and click on the little icon that has a small ...
by Jagveer 2L
Wed Oct 07, 2020 12:29 am
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 205
Views: 141454

Re: Rusty on High School Chem [ENDORSED]

https://www.khanacademy.org/science/chemistry/periodic-table This link refreshes trends on the periodic table, such as ionization energy and electronegativity. https://www.khanacademy.org/science/ap-chemistry/periodic-table-ap/periodic-table-of-elements-ap/v/periodic-table-introduction This link goe...
by Jagveer 2L
Wed Oct 07, 2020 12:12 am
Forum: Significant Figures
Topic: Sig Figs Clarification on Exact Numbers
Replies: 5
Views: 59

Re: Sig Figs Clarification on Exact Numbers

For Avogadro's number I always use 6.022x10^23, but for molar masses and percentages I use the values on the periodic table or that are given in the question and I round to the exact number of sig figs at the very end, so it is the last step that I complete. This makes your answer more accurate and ...
by Jagveer 2L
Tue Oct 06, 2020 11:55 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8245
Views: 1440238

Re: Post All Chemistry Jokes Here

Why was the mole of oxygen molecules excited when he walked out of the singles bar?
He got Avogadro's number
by Jagveer 2L
Tue Oct 06, 2020 11:53 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8245
Views: 1440238

Re: Post All Chemistry Jokes Here

What did the scientist say when he found 2 isotopes of helium?
HeHe
by Jagveer 2L
Tue Oct 06, 2020 11:45 pm
Forum: General Science Questions
Topic: Textbook
Replies: 9
Views: 118

Re: Textbook

If you are still not able to access the textbook you may want to drop by Dr. Lavelle's office hours tomorrow from 9:30 am to 10:30 am so that you are able to quickly fix the problem.

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