Search found 40 matches

by ColmConnolly1E
Sun Nov 29, 2020 8:39 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 4
Views: 24

Re: Bond Angles

Those are the only factors I consider and I did OK on the sapling problems. I would make sure you had all the shape angles memorized as they are somewhat counterintuitive for me.
by ColmConnolly1E
Sun Nov 29, 2020 8:34 pm
Forum: Sigma & Pi Bonds
Topic: Rotation
Replies: 9
Views: 34

Re: Rotation

Yes I would say that that makes sense
by ColmConnolly1E
Sun Nov 29, 2020 8:33 pm
Forum: Sigma & Pi Bonds
Topic: Pi vs Delocalized Pi Bonds
Replies: 3
Views: 16

Re: Pi vs Delocalized Pi Bonds

A delocalized pi bond is a resonant pi bond, basically, if you could write a resonant structure where a double or triple bond would take the place of a single bond, that would represent a delocalized pi bond.
Hope this helps!
Colm
by ColmConnolly1E
Sun Nov 29, 2020 8:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: ions
Replies: 8
Views: 31

Re: ions

Hi Augustina, hope your first year of college is going well! If atoms have a negative charge, they should repel any lone pair/bonded electrons around them while if they had a positive charge they would attract these regions of high electron density. This should also hold true for dipoles and other p...
by ColmConnolly1E
Sun Nov 29, 2020 8:19 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration for Transition Metals
Replies: 3
Views: 32

Re: Electron Configuration for Transition Metals

The key things for me are when you count up, you start with the s orbitals and when you count down, like with ions, those are the first to go. You also need to remember the exceptions to this general rule with chromium (3d5 4s1) and copper (3d10 4s1) both moving an s orbital electron to the d orbita...
by ColmConnolly1E
Sun Nov 22, 2020 10:05 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 2 Scores
Replies: 28
Views: 138

Re: Midterm 2 Scores

I’m not trying to rush him, just speculating on when we might have our scores back, I know a lot of people stress about not knowing how they did and not knowing when they will find out
by ColmConnolly1E
Sun Nov 22, 2020 10:00 pm
Forum: Octet Exceptions
Topic: Textbook 2C7 Iodine
Replies: 2
Views: 13

Re: Textbook 2C7 Iodine

I just want to add that for most molecules it would be good to make use of the octet rule first, iodine is kind of an exception to the standard operating procedure
by ColmConnolly1E
Sun Nov 22, 2020 9:49 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: Hydrogen Bonding Confusion
Replies: 3
Views: 30

Re: Hydrogen Bonding Confusion

I think it can also cause conformational changes in large molecules, like I know for a fact that some proteins shapes depend on hydrogen bonding, and it is the breakage of these hydrogen bonds that leads to protein denaturation at high temperature.
by ColmConnolly1E
Sun Nov 22, 2020 9:41 pm
Forum: Administrative Questions and Class Announcements
Topic: Thanksgiving
Replies: 26
Views: 98

Re: Thanksgiving

I imagine we will still have a lecture but I would wait for word from up top before jumping to conclusions.
by ColmConnolly1E
Sun Nov 22, 2020 9:39 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 2 Scores
Replies: 28
Views: 138

Re: Midterm 2 Scores

There was also a problem with the last midterm that extended the grading time iirc, so I think it might be faster this time around.
by ColmConnolly1E
Sun Nov 15, 2020 11:47 pm
Forum: Ionic & Covalent Bonds
Topic: Workshop Hydrogen Bonding Question
Replies: 4
Views: 15

Re: Workshop Hydrogen Bonding Question

Yes, this compound can serve as the lone pair side of hydrogen bonding, but not as the hydrogen-attached-to-electronegative-atom side of it.
by ColmConnolly1E
Sun Nov 15, 2020 11:44 pm
Forum: Lewis Structures
Topic: Coordinate Covalent Bond vs Lewis Acid/Base
Replies: 2
Views: 9

Re: Coordinate Covalent Bond vs Lewis Acid/Base

I think this is a case of set subset interaction, where all coordinate covalent bonding is Lewis Acid-Base bonding but not vice versa, or I could be confised. This is a bit of a tricky topic for me but I thought I would throw in my two cents. Please correct me if I am mistaken!
by ColmConnolly1E
Sun Nov 15, 2020 11:42 pm
Forum: Resonance Structures
Topic: Maximum
Replies: 3
Views: 30

Re: Maximum

Google is a good shortcut for the real world, but unfortunately, it won't help you on the test. If you are given the bond lengths though, we can see what resonance structures will be favored based on experimental evidence.
by ColmConnolly1E
Sun Nov 15, 2020 11:40 pm
Forum: Bond Lengths & Energies
Topic: Bonds and Accepting Electrons
Replies: 2
Views: 22

Re: Bonds and Accepting Electrons

Just to add on a bit I believe it has to be a double bond due to the magnitude of the dipole involved. A polar double bond will have more of a charge disparity than a polar single bond, and therefore more of an ability to accept electrons.
by ColmConnolly1E
Sun Nov 15, 2020 11:32 pm
Forum: Bond Lengths & Energies
Topic: Question 3 F.15
Replies: 1
Views: 11

Re: Question 3 F.15

The boiling points of these molecules will be different based on the strength of the intermolecular interactions that they experience. Their relative molecular weight also plays a part as compounds with heavier molar masses will take more energy to vaporize than lighter ones. CF 2 H 2 does not have ...
by ColmConnolly1E
Sun Nov 08, 2020 11:55 pm
Forum: Electronegativity
Topic: Fluorine and Helium
Replies: 6
Views: 24

Re: Fluorine and Helium

I think so, especially since Noble gasses are the exception to so many rules. But there is also some argument that He should be next to H I think? Like this is one of the arguments for why it belongs on the left side of the table iirc.
by ColmConnolly1E
Sun Nov 08, 2020 11:53 pm
Forum: Resonance Structures
Topic: formal charge
Replies: 3
Views: 15

Re: formal charge

I'm pretty sure it is because the form with the lowest formal charge would also be the most stable! So it is naturally going to be favored due to the 2nd law of thermodynamics. Hope that helps!
by ColmConnolly1E
Sun Nov 08, 2020 11:51 pm
Forum: Lewis Structures
Topic: Sapling Week 5-6 HW Question 6
Replies: 7
Views: 49

Re: Sapling Week 5-6 HW Question 6

Yeah, I'm pretty sure CO2 would have a resonant structure with one C=O bond and one C-O bond.
Just for a bit more clarity.
by ColmConnolly1E
Thu Nov 05, 2020 1:22 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 1 Review
Replies: 7
Views: 56

Midterm 1 Review

Hi All, As the scores are now in CCLE, I was wondering if there will be any way for us to review our tests and see what we did wrong. I'd like to learn from my mistakes, but I understand that the online environment does not always permit this. Perhaps we could schedule a meeting with our TAs 1on1 to...
by ColmConnolly1E
Thu Nov 05, 2020 1:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 1
Replies: 9
Views: 108

Re: Midterm 1

They are in! Go and check if you dare.
by ColmConnolly1E
Sun Nov 01, 2020 7:47 pm
Forum: Administrative Questions and Class Announcements
Topic: Curve on Midterm
Replies: 9
Views: 114

Re: Curve on Midterm

My TA told us that the test will be graded on a straight scale with partial credit awarded for some wrong answers on certain questions to make up for the fact that they can't see our thought process. In another thread, someone mentioned that we should expect to have our scores in hand at the end of ...
by ColmConnolly1E
Sun Nov 01, 2020 7:42 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity
Replies: 2
Views: 26

Re: Electron Affinity

Hi Lily, could you clarify your question a little bit? I'll do my best with what you have but I'm a touch unsure what I am answering. Electron affinity won't itself determine whether energy is released or absorbed, that has to do with what is happening to the electron. We would need to add energy to...
by ColmConnolly1E
Sun Nov 01, 2020 6:58 pm
Forum: Trends in The Periodic Table
Topic: Sapling question 24
Replies: 3
Views: 26

Re: Sapling question 24

Effective nuclear charge refers to the net positive charge an electron experiences in an atom. Since the only positive component of an atom of matter is a proton, and a fluorine atom would have 1 more proton than an oxygen atom, a fluorine atom would have more total positive charge to distribute amo...
by ColmConnolly1E
Mon Oct 26, 2020 11:29 pm
Forum: DeBroglie Equation
Topic: Sapling Week 2 HW_problem #22
Replies: 7
Views: 51

Re: Sapling Week 2 HW_problem #22

^^for the person who asked for my solution, sapling said this was correct
by ColmConnolly1E
Mon Oct 26, 2020 11:28 pm
Forum: DeBroglie Equation
Topic: Sapling Week 2 HW_problem #22
Replies: 7
Views: 51

Re: Sapling Week 2 HW_problem #22

Constants: λ=0.0197nm=(1.97*10^-11)m, h=(6.63*10^-34) J*s, m(electron)=(9.11*10^-31) kg λ=h/mv -> v=h/mλ -> v=(6.63*10^-34)/((1.97*10^-11)(9.11*10^-31))=(3.69427248464*10^7)m/s Ek = 1/2(m)(v)^2 -> Ek=(0.5)(9.11*10^-31)((3.69427248464*10^7)^2)=6.2165042e-16 J Then you just convert J to eV (6.2165042*...
by ColmConnolly1E
Sun Oct 25, 2020 11:50 pm
Forum: DeBroglie Equation
Topic: Any tips for using a TI-83 Calculator?
Replies: 4
Views: 21

Re: Any tips for using a TI-83 Calculator?

I think a good tip is to use the function buttons. It is just a lot easier for me to keep track of like fractions and stuff when I use f1 to make them more clear.
Hope this helps!
by ColmConnolly1E
Sun Oct 25, 2020 11:41 pm
Forum: DeBroglie Equation
Topic: Sapling Week 2 HW_problem #22
Replies: 7
Views: 51

Re: Sapling Week 2 HW_problem #22

So for this problem, we are given the wavelength of the matter-wave and asked to calculate the energy it outputs. To find the total kinetic energy of an electron from its wave-like properties, we need to use the Kinetic Energy equation, however, this equation requires the velocity of the particle wh...
by ColmConnolly1E
Sun Oct 25, 2020 11:19 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: d orbitals
Replies: 17
Views: 65

Re: d orbitals

According to his lecture on the topic, this would mean that the wave function for the electrons in a given atom would have experimentally verifiable solutions that fall into 5 distinct patterns or "lobes". As I understand it, this would be one function that could have 5 general areas of so...
by ColmConnolly1E
Sun Oct 25, 2020 11:13 pm
Forum: *Shrodinger Equation
Topic: Clarrification of EΨ
Replies: 5
Views: 93

Re: Clarrification of EΨ

Are the Hamiltonian functions something that would be unique to each atom, or will all atoms share a set of wave functions?
by ColmConnolly1E
Sun Oct 25, 2020 11:10 pm
Forum: *Shrodinger Equation
Topic: Additional Audio-Visual Modules
Replies: 2
Views: 22

Re: Additional Audio-Visual Modules

I do not believe that there will be any more Audio-Visual Modules, as from Outline 3 onward they are no longer present in the outlines. However, I don't think that this is conclusive it's just my best guess with the information available. Hope this helps!
by ColmConnolly1E
Sun Oct 18, 2020 10:55 pm
Forum: Properties of Light
Topic: Intensity of light
Replies: 2
Views: 26

Re: Intensity of light

I don't know specifically what kind of questions we might be asked on intensity, but it should factor into the wave equations as amplitude. From what I remember from calc, this should be a constant multiplying the rest of the wave equation, but it would be great if someone could give a more mathemat...
by ColmConnolly1E
Sun Oct 18, 2020 10:51 pm
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 196
Views: 905

Re: How are you studying?

I honestly think one of the best ways to study is to teach others. I have a friend in this class, and we take turns explaining how to do difficult problems to each other in theory, then the other person follows the steps laid out and sees if they got the right answer according to the SSM on sapling....
by ColmConnolly1E
Sun Oct 18, 2020 10:45 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra
Replies: 3
Views: 27

Re: Atomic Spectra

The first line of the question tells us that 1 meter will contain 1,650,763.73 waves of the radiation being emitted. We can flip this on its head to say that 1 wave will have a length of 1 meter / 1,650,763.73 or 6.05780211×10^-7m (605.8 nm). Since visible light ranges from about 400-700nm, we know ...
by ColmConnolly1E
Sun Oct 18, 2020 10:24 pm
Forum: *Black Body Radiation
Topic: Black Body Radiation
Replies: 13
Views: 71

Re: Black Body Radiation

Just as a fun aside, the closest we have come to making a black body material is a set of vertically aligned carbon nanotubes. These allow EM radiation in which then can bounce around in the tubes and get absorbed by the carbon at near-perfect levels. Their unique structure allowed a Japanese team i...
by ColmConnolly1E
Sun Oct 18, 2020 10:13 pm
Forum: Administrative Questions and Class Announcements
Topic: Where can I buy a webcam for a reasonable price?
Replies: 60
Views: 951

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

My TA told us that using our phone would not be acceptable but that seems to contradict what others are saying in this thread. In any case, I got this webcam https://www.amazon.com/gp/product/B089NWSGDR/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1 used off of amazon for dirt cheap (<$10). I'...
by ColmConnolly1E
Sun Oct 11, 2020 6:13 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 205
Views: 141609

Re: Rusty on High School Chem [ENDORSED]

I found that the Audio-Visual Focus topics really helped me to shake off the rust I felt after not taking chem for a year. Even though the first couple seem a little basic, they are a great way to get your mind thinking about chemistry and get those neural networks firing! Besides that, everything w...
by ColmConnolly1E
Sun Oct 11, 2020 6:06 pm
Forum: Empirical & Molecular Formulas
Topic: Stoichiometric Coefficients
Replies: 3
Views: 58

Re: Stoichiometric Coefficients

I would just like to add that stoichiometric coefficients do not necessarily represent the number of moles being used in a problem, but the ratios of the number of moles of various compounds in relation to each other. For example, if I was using electrolysis to separate water into hydrogen and oxyge...
by ColmConnolly1E
Sun Oct 11, 2020 5:57 pm
Forum: Significant Figures
Topic: Sapling #4
Replies: 10
Views: 68

Re: Sapling #4

If you think about it, 3000 only has one numerical value and 3 placeholder digits. For example, you would be just as accurate saying 3 x 10^3 or 3000. 3200 on the other hand would necessitate 3.2 x 10^3 to maintain the same level of accuracy. To some extent, this is just a convention of science as w...
by ColmConnolly1E
Mon Oct 05, 2020 10:53 am
Forum: Administrative Questions and Class Announcements
Topic: Structure of Lectures
Replies: 9
Views: 176

Re: Structure of Lectures

Good to know, I watched the new lecture I was just thrown off at first because the music at the beginning was the same. Thanks for all the help guys!
Colm
by ColmConnolly1E
Mon Oct 05, 2020 10:19 am
Forum: Administrative Questions and Class Announcements
Topic: Structure of Lectures
Replies: 9
Views: 176

Re: Structure of Lectures

I think there is some problem with today's lecture then? The only things that show up in my media resources tab are two bruincasted lectures. Is anybody able to watch live?

Colm

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