Search found 60 matches

by Charlie Russell 2L
Thu Jan 14, 2021 11:02 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Differences in Rotation between σ-Bonds and π-Bonds
Replies: 5
Views: 53

Re: Differences in Rotation between σ-Bonds and π-Bonds

Sorry for the late response but I figured I would answer, regardless:

Yes, you are correct the the same logic does apply and the triple will have, in total 5 "points of contact."
by Charlie Russell 2L
Thu Jan 14, 2021 10:54 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Pure Liquids [ENDORSED]
Replies: 3
Views: 53

Re: Pure Liquids [ENDORSED]

Chem_Mod wrote:They are present in large excess compared to reactant concentration.
I'll review this again in Wednesday's class.


Okay yes, I now understand after last Wednesday's lecture, thank you!
by Charlie Russell 2L
Thu Jan 14, 2021 10:50 pm
Forum: Administrative Questions and Class Announcements
Topic: More Audio Visual Focus Topics
Replies: 8
Views: 22

Re: More Audio Visual Focus Topics

Probably not, I'm curious though that Dr. Lavelle might consider making his prerecorded lectures the modules for next year.

I think that would be smart since pre-recorded lectures/modules certainly have their benefits!
by Charlie Russell 2L
Thu Jan 14, 2021 10:48 pm
Forum: Administrative Questions and Class Announcements
Topic: midterms
Replies: 7
Views: 41

Re: midterms

No, I think it will actually be during Friday lecture time of I am not mistaken.
by Charlie Russell 2L
Thu Jan 14, 2021 10:46 pm
Forum: Administrative Questions and Class Announcements
Topic: Calculator for exams
Replies: 22
Views: 63

Re: Calculator for exams

Since everyone has the required calculator which would have that program on it, I would say it is fine but that's a good question for Lavelle!
by Charlie Russell 2L
Thu Jan 14, 2021 10:43 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6D.5 Textbook problem
Replies: 2
Views: 26

Re: 6D.5 Textbook problem

You have forgotten to balance your equation: 2OH!!!
by Charlie Russell 2L
Thu Jan 14, 2021 10:41 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Change in Partial Pressure
Replies: 2
Views: 24

Re: Change in Partial Pressure

Yes, I believe you are correct in saying that in the reactants, their total pressure does not change because, as mentioned, the partial pressures of the reactants have a direct relationship with each other, and an inverse relationship with the product partial pressures!
by Charlie Russell 2L
Thu Jan 14, 2021 9:23 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling week1/2 question #10
Replies: 2
Views: 36

Re: Sapling week1/2 question #10

1. To determine K c : K c = each concentration of product divided by each concentration of reactant ***remember put these values to the power of their stoichiometric coefficients*** Example: 2H 2 O <---> OH - + H 3 O + K c = [OH - ][H 3 O + ] / [H 2 O] 2 Just plug n chug to get K c ! 2. Q is the val...
by Charlie Russell 2L
Mon Jan 04, 2021 1:58 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Pure Liquids [ENDORSED]
Replies: 3
Views: 53

Pure Liquids [ENDORSED]

Wait... so why do pure liquids experience basically no change in concentration during a chemical reaction? I understand that pure solids do not have the "liter" aspect of molarity = mol/L thus a "solid concentration" does not exist but I am getting tripped up by the concepts surr...
by Charlie Russell 2L
Sun Dec 13, 2020 2:43 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Textbook Problem 9C.5
Replies: 5
Views: 36

Re: Textbook Problem 9C.5

The single bonded oxygen atoms can make a coordinate covalent bond to another transition metal. It would make their formal charge zero if they did, as well, thus making this bidentate because of those two single bond atoms.
by Charlie Russell 2L
Mon Dec 07, 2020 6:36 pm
Forum: Administrative Questions and Class Announcements
Topic: REMINDERS!
Replies: 2
Views: 39

Re: REMINDERS!

AHHH LOVE THIS! We all got this, we have to finish strong. Thank you for the reminder! Everybody remember to eat, sleep, stay hydrated and just take care of yourself (I know we can all get caught up studying and grinding during week 10 and finals week.) Good luck to everybody. So true, Meredith! Ev...
by Charlie Russell 2L
Mon Dec 07, 2020 6:22 pm
Forum: Administrative Questions and Class Announcements
Topic: REMINDERS!
Replies: 2
Views: 39

REMINDERS!

Just a quick reminder that Lavelle would like us to do the class evaluations ! You can find them in an email sent to your school Gmail account. Also, make sure to take advantage of the review sessions this week: - The review schedules can be found in your school email, in several messages from Lavel...
by Charlie Russell 2L
Sun Dec 06, 2020 10:34 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Differences in Rotation between σ-Bonds and π-Bonds
Replies: 5
Views: 53

Re: Differences in Rotation between σ-Bonds and π-Bonds

Pi-bonds have 2 areas of contact (the 2 p orbitals line up side to side!). Think of a ladder. If you try to move 1 ring but not the other, the ladder (bond) will break. For sigma bonds, they have 1 point of contact (end to end), think about wringing out a towel (lol), you can twist either way withou...
by Charlie Russell 2L
Sun Dec 06, 2020 10:30 pm
Forum: Administrative Questions and Class Announcements
Topic: Extra Credit
Replies: 13
Views: 122

Re: Extra Credit

I've heard TA's talking about Lavelle considering making the exam more difficult because the grades were too high (dear [censored], I hope that's a rumor or scare tactic to make us study and not reality). I've heard nothing about extra credit but I'm sure he knows everyone would deeply appreciate it...
by Charlie Russell 2L
Sun Dec 06, 2020 10:23 pm
Forum: Hybridization
Topic: Pi Bonds Cannot Rotate
Replies: 23
Views: 159

Re: Pi Bonds Cannot Rotate

The two p-orbitals overlap. Think of a LADDER. You cannot move 1 ring of the ladder without moving the other unless you break it (the bond breaks).
by Charlie Russell 2L
Sun Dec 06, 2020 10:21 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Definition of Ligand
Replies: 8
Views: 53

Re: Definition of Ligand

Any "lewis base" that is directly bound to a transition metal is what I consider to be a ligand.
by Charlie Russell 2L
Sun Dec 06, 2020 10:18 pm
Forum: Student Social/Study Group
Topic: Evaluations
Replies: 17
Views: 91

Re: Evaluations

I hope Lavelle offers some EC, it would give me a little room to breathe for this final as every single question counts! So nervous!

Also, some instructors, in fact, HAVE offered extra credit for the evaluations. They're anonymous BUT I think professors can see who completed them.
by Charlie Russell 2L
Sun Dec 06, 2020 10:16 pm
Forum: Administrative Questions and Class Announcements
Topic: last day of lecture
Replies: 12
Views: 98

Re: last day of lecture

Oh dang, this is good to know!

I'm excited and scared for 14B tbh!!!
by Charlie Russell 2L
Sun Dec 06, 2020 10:15 pm
Forum: Student Social/Study Group
Topic: finals
Replies: 4
Views: 45

Re: finals

Go to Lavelle's review sessions this week, he sent them in an email and they are flexible timing. Also, I would study the older material first, theoretically, if you did well on midterm two then you shouldn't have to worry about that as much! Whatever you feel weakest in, that's what you study. Take...
by Charlie Russell 2L
Sun Dec 06, 2020 10:12 pm
Forum: Administrative Questions and Class Announcements
Topic: CCLE Lectures
Replies: 9
Views: 62

Re: CCLE Lectures

Me too! I thought it was my wifi or something so I'm happy to know I'm not alone!
by Charlie Russell 2L
Sun Dec 06, 2020 10:11 pm
Forum: Naming
Topic: naming chart
Replies: 4
Views: 38

Re: naming chart

The one in the textbook is useful, as well.
by Charlie Russell 2L
Mon Nov 23, 2020 5:32 pm
Forum: Photoelectric Effect
Topic: Experimental specifics
Replies: 1
Views: 37

Re: Experimental specifics

The photoelectric effect proved that light can act as particles! This was really a revolutionizing discovery about light. So just also know that this experiment contributes to the particle part of the wave-particle duality of light!
by Charlie Russell 2L
Mon Nov 23, 2020 5:18 pm
Forum: Significant Figures
Topic: Multiplying versus adding
Replies: 5
Views: 70

Re: Multiplying versus adding

The given number (in the question) with the LEAST significant figures is the number of significant figures that you use in your answer. This applies to any sort of question.

The second example you gave should have 2 sig figs for this reason.
by Charlie Russell 2L
Mon Nov 23, 2020 5:13 pm
Forum: Student Social/Study Group
Topic: Favorite TV shows
Replies: 176
Views: 868

Re: Favorite TV shows

Marco Vivar 3G wrote:My favorite tv show to watch on Netflix is Avatar The Last Airbender. I know this show is popular but it has so much rewatchability!


YES! ngl this show slappppppssssss!!!
by Charlie Russell 2L
Mon Nov 23, 2020 5:12 pm
Forum: Student Social/Study Group
Topic: Favorite TV shows
Replies: 176
Views: 868

Re: Favorite TV shows

Killing Eve is very, very good. I highly recommend that one!

Also, Game of Thrones (I started watching but then school started so I had to stop) is also very good.

Rick and Morty omfg, so funny imo.

These are all great shows, I promise you will enjoy!
by Charlie Russell 2L
Mon Nov 23, 2020 5:08 pm
Forum: SI Units, Unit Conversions
Topic: How to memorize prefixes
Replies: 22
Views: 204

Re: How to memorize prefixes

You just gotta Quizlet those out, I think that's the best way and it took me maybe 5 minutes/day for two days until I had them down.
by Charlie Russell 2L
Mon Nov 23, 2020 5:06 pm
Forum: Electronegativity
Topic: How to memorize
Replies: 6
Views: 67

Re: How to memorize

Another thing to remember is that elements right next to each other will have closer electronegativity than those directly below elements. So two elements touching in different periods will have greater electronegativity than that element touching one of the same period.
by Charlie Russell 2L
Mon Nov 23, 2020 5:03 pm
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: Relation to type of bond
Replies: 3
Views: 39

Re: Relation to type of bond

Yes, both viscosity and surface tension directly relate to increasing intermolecular forces.
by Charlie Russell 2L
Tue Nov 17, 2020 8:52 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Effective Nuclear Charge
Replies: 3
Views: 62

Effective Nuclear Charge

Could someone interpret this statement from 1E.5 in the textbook: "Electrons in an s-orbital are more effective than those in other orbitals at shielding other electrons from the nuclear charge because an electron in an s-orbital can penetrate to the nucleus of the atom." I understand that...
by Charlie Russell 2L
Sun Nov 15, 2020 11:04 pm
Forum: Lewis Structures
Topic: Lewis Acids and Bases VS Cations and Anions
Replies: 3
Views: 34

Re: Lewis Acids and Bases VS Cations and Anions

No, not interchangeable terms. Lewis acids and bases are when one atom or compound (a Lewis base) can donate to another atom or compound (Lewis acid). Cations and anions when bonded are electrostatically attracted enough for an electron to get transferred over in an ionic bond (ion-ion bond).
by Charlie Russell 2L
Sun Nov 15, 2020 10:46 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Oxidations Numbers
Replies: 4
Views: 50

Re: Oxidations Numbers

Hey, I just answered a question similar to this one! Here was my answer: Oxidation numbers, also called oxidation states, are the total number of electrons that an atom either gains or loses in order to form a chemical bond with another atom. An oxidation number can be assigned to a given element or...
by Charlie Russell 2L
Sun Nov 15, 2020 10:43 pm
Forum: Ionic & Covalent Bonds
Topic: Hydrogen Bonding in Water
Replies: 2
Views: 31

Re: Hydrogen Bonding in Water

Because the difference in electronegativity between H and the electronegative atom (N, O, F) must be strong enough to keep them together, I am assuming. So before the bond, the H has a high positive delta (because if is covalently bonded to a strongly electronegative atom N, O, F) and this H can for...
by Charlie Russell 2L
Sun Nov 15, 2020 10:32 pm
Forum: Formal Charge and Oxidation Numbers
Topic: oxidation numbers
Replies: 4
Views: 54

Re: oxidation numbers

Oxidation numbers, also called oxidation states, are the total number of electrons that an atom either gains or loses in order to form a chemical bond with another atom. An oxidation number can be assigned to a given element or compound by following the following rules: - The oxidation number of a f...
by Charlie Russell 2L
Sun Nov 15, 2020 10:10 pm
Forum: Coordinate Covalent Bonds
Topic: Sapling Week 5/6 #13
Replies: 5
Views: 38

Re: Sapling Week 5/6 #13

He's right, there are 8. In addition to what he explained, I would simply offer the advice to draw out both structures next to each other and keep in mind the H-Bond rules, it should make it a lot more intuitive and easier!
by Charlie Russell 2L
Sun Nov 15, 2020 10:07 pm
Forum: Electronegativity
Topic: London Dispersion Forces
Replies: 9
Views: 87

Re: London Dispersion Forces

I have found the answer to be A, B, and E. I understand I2 but I don't understand C2H6 or BF3. How do C and H not have a difference in electronegativity and why would BF3 and NF3 have similar forces applied to them? They both have different electronegativity between the atoms in their molecules and...
by Charlie Russell 2L
Tue Nov 10, 2020 11:16 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Ionic Structures
Replies: 6
Views: 35

Re: Ionic Structures

For Lewis Structures, we TYPICALLY try to get as many formal charges to 0 as possible, as this is the most stable, so if a double bond allows most of the atoms to have a formal charge of zero, we will "exchange" a lone pair for a double bond. But be careful for atoms like F- (fluorine) bec...
by Charlie Russell 2L
Mon Nov 09, 2020 10:30 pm
Forum: Bond Lengths & Energies
Topic: Electron Pairs Interacting
Replies: 3
Views: 26

Re: Electron Pairs Interacting

Coulomb's Law shows that like charges repel and opposite charges attract. If F in the Coulomb's Law Equation is negative, then the charges are attracting and vice versa.
by Charlie Russell 2L
Mon Nov 09, 2020 10:26 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic/Covalent
Replies: 8
Views: 43

Re: Ionic/Covalent

Because a compound can be made up of covalently bonded molecules the bind, ionically, to eachother.
by Charlie Russell 2L
Fri Oct 30, 2020 4:33 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Score
Replies: 1
Views: 33

Midterm Score

Will the Midterm scores be posted under "Grades" on CCLE?
by Charlie Russell 2L
Thu Oct 29, 2020 8:58 pm
Forum: Student Social/Study Group
Topic: How to relax
Replies: 113
Views: 593

Re: How to relax

I like everything music: listening, singing, even making music in my head can be fun. Studying con be relaxing too if you're not studying or cramming under a deadline!
by Charlie Russell 2L
Thu Oct 29, 2020 8:56 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: h vs. ħ?
Replies: 11
Views: 119

Re: h vs. ħ?

ħ is not h/4pi!!! It is h/2pi. 4pi was only in the equation used for the midterm because there was a 2 in the denominator to multiply!
by Charlie Russell 2L
Thu Oct 29, 2020 8:53 pm
Forum: Student Social/Study Group
Topic: Test Scored for Midterm 1
Replies: 49
Views: 381

Re: Test Scored for Midterm 1

In our workshop, the TA said that the midterm was technically supposed to get graded after the last discussion section takes it on Friday, but he also told us to not be surprised if it takes a little longer!
by Charlie Russell 2L
Thu Oct 29, 2020 8:48 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: position units
Replies: 19
Views: 116

Re: position units

Since m is the SI unit, ALWAYS convert to the SI unit unless the problem asks for a different unit.
by Charlie Russell 2L
Thu Oct 29, 2020 8:45 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8503
Views: 1469672

Re: Post All Chemistry Jokes Here

What did the thermometer say to the measuring cylinder?
“You may be graduated, but I have several degrees.”
by Charlie Russell 2L
Thu Oct 29, 2020 8:42 pm
Forum: Photoelectric Effect
Topic: Electron Properties
Replies: 4
Views: 58

Re: Electron Properties

Could you clarify the question?

You can use a spectrometer to find wavelengths of spectra, the spectra would detail wavelengths it could pick up, presumably.
by Charlie Russell 2L
Thu Oct 29, 2020 8:24 pm
Forum: Student Social/Study Group
Topic: Post Midterm Blues
Replies: 71
Views: 606

Re: Post Midterm Blues

You'll be okay, its only one class! And think of how stressful this whole year has been!
by Charlie Russell 2L
Thu Oct 29, 2020 8:22 pm
Forum: Student Social/Study Group
Topic: review sessions
Replies: 3
Views: 42

Re: review sessions

I went to the workshops this week (week of midterm) and they were all about Week 4. Be aware of this for next final that material is covered week by week in workshops, just like discussion sections. Drop-in sessions should be good for any individual questions you may have.
by Charlie Russell 2L
Thu Oct 29, 2020 8:19 pm
Forum: Photoelectric Effect
Topic: Kinetic Energy
Replies: 10
Views: 106

Re: Kinetic Energy

True because higher frequency has a direct relationship with kinetic energy, after threshold is met!
by Charlie Russell 2L
Thu Oct 29, 2020 8:16 pm
Forum: Properties of Electrons
Topic: Photon/ Electron Interaction
Replies: 5
Views: 51

Re: Photon/ Electron Interaction

The energy (photon) just passes through is what my TA said.
by Charlie Russell 2L
Tue Oct 20, 2020 11:20 am
Forum: *Black Body Radiation
Topic: What is Black Body?
Replies: 35
Views: 563

Re: What is Black Body?

Hey, so I just researched this question and thought I would come on Chem Comm and help some peers out. "An example of a black body is a cavity with a small hole in it. Any light incident upon the hole goes into the cavity and is essentially never reflected out since it would have to undergo a ...
by Charlie Russell 2L
Mon Oct 19, 2020 2:59 pm
Forum: *Black Body Radiation
Topic: What is Black Body?
Replies: 35
Views: 563

Re: What is Black Body?

Hey, so I just researched this question and thought I would come on Chem Comm and help some peers out. "An example of a black body is a cavity with a small hole in it. Any light incident upon the hole goes into the cavity and is essentially never reflected out since it would have to undergo a v...
by Charlie Russell 2L
Sun Oct 18, 2020 10:09 pm
Forum: Administrative Questions and Class Announcements
Topic: Petition to Bring Music Back To Lectures [ENDORSED]
Replies: 34
Views: 537

Re: Petition to Bring Music Back To Lectures [ENDORSED]

Hahaha I love that this is one of the topics for Chemistry Community!
by Charlie Russell 2L
Sun Oct 18, 2020 10:07 pm
Forum: Student Social/Study Group
Topic: Midterm 1
Replies: 8
Views: 64

Re: Midterm 1

Weeks 1 - 3 and make sure to really get into some of those topics that may have been a weakness for you! Do some of the modules maybe!
by Charlie Russell 2L
Sun Oct 18, 2020 10:04 pm
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 203
Views: 1269

Re: How are you studying?

BruinWalk reviews of this course mentioned that there are some unemphasized material that can show up on later tests. For this reason, I think you should try to get well written notes down of the lecture and highlight problem areas as you go. Also, what's YOUR best time to study. Might it be the mor...
by Charlie Russell 2L
Sun Oct 18, 2020 9:56 pm
Forum: Administrative Questions and Class Announcements
Topic: Where can I buy a webcam for a reasonable price?
Replies: 60
Views: 1099

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

I would check eBay bc everything on Amazon is bound to be more expensive, OR you could use you phone cam (and prop it up around workspace and/or your computer cam for tests. Hope this clears it up!
by Charlie Russell 2L
Sun Oct 11, 2020 10:14 pm
Forum: Student Social/Study Group
Topic: High School Chemistry Review/Resources
Replies: 6
Views: 68

Re: High School Chemistry Review/Resources

Other people already said this one but ABSOLUTELY CHECK OUT KHAN ACADEMY. It is very step-by-step, very easy to follow, and broken down with the natural flow of the curriculum!
by Charlie Russell 2L
Sun Oct 11, 2020 10:12 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test Accuracy
Replies: 13
Views: 154

Re: Test Accuracy

The amount of significant figures used in the numerical data of the question will be the amount of sig figs you should use in your answer!
by Charlie Russell 2L
Sun Oct 11, 2020 10:10 pm
Forum: Limiting Reactant Calculations
Topic: Theoretical Yield/ Percent Yield
Replies: 5
Views: 62

Re: Theoretical Yield/ Percent Yield

Yes, because the limiting reactant will be the same same amount of MOLES as the product!
by Charlie Russell 2L
Sun Oct 11, 2020 10:08 pm
Forum: SI Units, Unit Conversions
Topic: Avogadro's Constant
Replies: 12
Views: 105

Re: Avogadro's Constant

I agree with the above responses.

One thing that could help is to research or watch a Youtube video on how Avogadro's number came to be. We did this in my highschool chemistry class and it definitely cleared things up!
by Charlie Russell 2L
Sun Oct 11, 2020 10:06 pm
Forum: Balancing Chemical Reactions
Topic: Molar Mass
Replies: 23
Views: 185

Re: Molar Mass

Don't consider significant figures until you have your final answer. You will use the number of sig figs of the numerical data provided in the question, using THAT number of sig figs for your final answer. Be as precise as possible during computation ex. using the detailed molar masses provided on t...

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