Search found 100 matches
- Wed Mar 10, 2021 1:35 pm
- Forum: Student Social/Study Group
- Topic: Exam Review
- Replies: 10
- Views: 529
Re: Exam Review
Their office hours are especially busy the week before finals, so your best bet would be to email them and work out a separate time.
- Wed Mar 10, 2021 1:32 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Adsorption
- Replies: 5
- Views: 274
Re: Adsorption
Adsorption is the adhesion of a gas or liquid to the surface of a solid. The catalyst is the adsorbent and the reactants are the adsorbate.
- Wed Mar 10, 2021 9:34 am
- Forum: Student Social/Study Group
- Topic: Clubs/Organizations
- Replies: 9
- Views: 618
Re: Clubs/Organizations
I was waiting until we are on campus to join clubs as well. There will still be plenty of time to get involved after we get back (:
- Wed Mar 10, 2021 9:32 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Is there a catalyst in this mechanism? [ENDORSED]
- Replies: 6
- Views: 316
Re: Is there a catalyst in this mechanism? [ENDORSED]
It helps me to think that a catalyst is used and then later produced.
- Wed Mar 10, 2021 9:29 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Sapling Homework #14
- Replies: 4
- Views: 232
Re: Sapling Homework #14
The equation to use is ln(K2/K1)=( Ea/R)(1/T1 - 1/T2)
K2/K1 is equal to "how many times faster" that the problem gives you.
K2/K1 is equal to "how many times faster" that the problem gives you.
- Sun Mar 07, 2021 8:58 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Slowest step
- Replies: 38
- Views: 1376
Re: Slowest step
A good way to think about this is a group race. The teams final time is determined by the last person to cross the finish line aka the slowest member.
- Sat Mar 06, 2021 8:34 pm
- Forum: Administrative Questions and Class Announcements
- Topic: [CHEM 14B KARAOKE]
- Replies: 68
- Views: 5699
Re: [CHEM 14B KARAOKE]
Thank you to all of the organizers! That was a great idea and executed very well (:
- Sat Mar 06, 2021 8:32 pm
- Forum: Student Social/Study Group
- Topic: Ebook isn't working for me
- Replies: 6
- Views: 349
Re: Ebook isn't working for me
This happens to me every once in awhile but I can usually resolve it by closing down the tab restarting my computer.
- Fri Mar 05, 2021 7:27 pm
- Forum: Student Social/Study Group
- Topic: 14B Final
- Replies: 22
- Views: 952
Re: 14B Final
Last quarter, there were a certain percentage of questions based on how much time we spent on that topic. I am sure it will be the same.
- Mon Mar 01, 2021 9:17 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grades
- Replies: 7
- Views: 421
Re: Grades
If you are trying to determine what grade you need on the final, multiply 400 by the percentage you want, then subtract the points you have already earned and the points you expect to earn from sapling and chem community.
- Mon Mar 01, 2021 9:15 pm
- Forum: Student Social/Study Group
- Topic: Spring Break
- Replies: 53
- Views: 3154
Re: Spring Break
I will definitely be soaking up some sun at the beach after spending this quarter cooped up doing online classes.
- Mon Mar 01, 2021 9:14 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Week 9 Sapling?
- Replies: 6
- Views: 406
Re: Week 9 Sapling?
He will most likely post it by Wednesday at the latest
- Sun Feb 28, 2021 8:48 pm
- Forum: General Science Questions
- Topic: Midterm 2 Reactions
- Replies: 79
- Views: 5117
Re: Midterm 2 Reactions
In regards to this, I think that everyone stressed about their midterms grade and the final come up should meet with their TA to see where they went wrong. Sometimes they reveal silly mistakes that could save you some points on the final.
- Sun Feb 28, 2021 8:46 pm
- Forum: Balancing Redox Reactions
- Topic: Sapling #1 Glitch
- Replies: 16
- Views: 792
Re: Sapling #1 Glitch
I had the same problem but I quit safari and then re-opened sapling and that fixed it(:
- Mon Feb 22, 2021 6:36 pm
- Forum: Student Social/Study Group
- Topic: Students Who Have a Job
- Replies: 103
- Views: 8964
Re: Students Who Have a Job
I work roughly the same amount of hours. It is definitely hard to manage time, but in some ways I like the break from thinking about school. Time management is super important.
- Thu Feb 18, 2021 10:32 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Office Hours 2/19
- Replies: 5
- Views: 295
Re: Office Hours 2/19
In my case, my TA sent an email rescheduling the office hours to an earlier date. If you didn't get an email like this, I would assume you still have office hours.
- Thu Feb 18, 2021 10:27 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Perfect System
- Replies: 3
- Views: 203
Re: Perfect System
Most(if not all) of the problems in this class deal with perfect systems. I would assume this is the case unless otherwise stated.
- Thu Feb 18, 2021 11:17 am
- Forum: General Science Questions
- Topic: Careless Mistakes
- Replies: 54
- Views: 3308
Re: Careless Mistakes
It is easier to make careless mistakes if you are stressed and nervous. Take a deep breath during the exam and be confident that you know your stuff. If you have time at the end, go through the problems again and see if you get the same answer.
- Thu Feb 18, 2021 11:14 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Transition Temperature
- Replies: 2
- Views: 135
Re: Transition Temperature
All of the heat going into the system is used to break the bonds to change the phase.
- Thu Feb 18, 2021 11:13 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: 4J.13 Textbook Problem
- Replies: 2
- Views: 182
Re: 4J.13 Textbook Problem
Delta G being negative means the reaction is spontaneous, and if it is spontaneous the product will be more stable than the reactants.
- Sat Feb 13, 2021 4:57 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: higer molar entropy
- Replies: 13
- Views: 576
Re: higer molar entropy
A good way to think about this is gas in a piston. When the ATM is high, that means the piston is condensed which leaves less room for the gas to be in. When the ATM is lower, the piston is less condensed which means there is more room for the gas to spread around in, making the entropy higher.
- Sat Feb 13, 2021 4:55 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Relationship between K and deltaGº
- Replies: 4
- Views: 236
Re: Relationship between K and deltaGº
When Delta G is negative, the reaction is spontaneous. Therefore more product is produced, causing K to be greater than one.
- Sat Feb 13, 2021 4:52 pm
- Forum: Student Social/Study Group
- Topic: Balance / Self Care Tips
- Replies: 62
- Views: 2893
Re: Balance / Self Care Tips
This class has definitely forced me to change my study habits. I plan my studying much further in advance so I am not cramming at the end. Separating the studying and problems out also allows you to take breaks in between to do something else and get your mind off of chemistry.
- Thu Feb 11, 2021 11:07 pm
- Forum: Student Social/Study Group
- Topic: Thoughts on Upcoming Midterm 2
- Replies: 41
- Views: 1581
Re: Thoughts on Upcoming Midterm 2
Check out YouTube videos for thermodynamics. I recommend the organic chemistry tutor. He breaks the concepts and formulas down in a clear and concise way that helped my understanding.
- Thu Feb 11, 2021 11:04 pm
- Forum: Student Social/Study Group
- Topic: Chem 14BL Workload
- Replies: 22
- Views: 1172
Re: Chem 14BL Workload
Also note that if you are deciding between taking BL or C in the summer, the six week pace for 14C may be more rough than it would be for 14BL.
- Fri Feb 05, 2021 11:48 am
- Forum: Calculating Work of Expansion
- Topic: Reversible Expansion
- Replies: 7
- Views: 267
Re: Reversible Expansion
A reversible expansion with constant pressure would just then be considered an irreversible equation.
- Fri Feb 05, 2021 11:38 am
- Forum: Student Social/Study Group
- Topic: Studying When You Don't Want to
- Replies: 48
- Views: 2492
Re: Studying When You Don't Want to
Making a list or organizer always helps. It helps to break down each activity into small steps, and then you feel like you are not facing such a daunting activity.
- Fri Feb 05, 2021 11:35 am
- Forum: Phase Changes & Related Calculations
- Topic: Reversible and Irreversible
- Replies: 6
- Views: 278
Re: Reversible and Irreversible
arisawaters2D wrote:are reversible expansion pathways always isothermic?
A quick google search led me to find out that there are reversible pathways that are NOT isothermic.
- Wed Feb 03, 2021 1:54 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Outlines for Midterm 2
- Replies: 4
- Views: 222
Re: Outlines for Midterm 2
I'm not sure, but if I had to guess I would say that 3,4, & part of 5 sounds reasonable.
- Tue Jan 26, 2021 5:03 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: KA2 Help
- Replies: 3
- Views: 255
Re: KA2 Help
I believe you are able to ignore the second ionization constant when KA2 is less than KA1
- Tue Jan 26, 2021 5:01 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Discussion Section on day of Midterm
- Replies: 6
- Views: 286
Re: Discussion Section on day of Midterm
My discussion section is still scheduled to happen on Friday before the exam. I am assuming we are going to be using it for review.
- Mon Jan 25, 2021 11:29 pm
- Forum: Student Social/Study Group
- Topic: Favorite Music
- Replies: 113
- Views: 9781
Re: Favorite Music
Lo Fi playlists are really great for studying/homwork
- Mon Jan 25, 2021 1:43 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Class Website Password
- Replies: 2
- Views: 195
Re: Class Website Password
^^If you forget again, you can always check the email he sent just before classes started. It is stated in there.
- Mon Jan 25, 2021 1:42 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard Enthalpy of Formation
- Replies: 10
- Views: 415
Re: Standard Enthalpy of Formation
In his examples he mentions a standard enthalpy chart, so I am assuming if you are not given the specific values, you will be given a chart or table from which to find them.
- Mon Jan 25, 2021 1:40 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Catalysts and equilibrium
- Replies: 4
- Views: 86
Re: Catalysts and equilibrium
No. The reason for this being that a catalyst speeds up the forward and reverse reaction by the exact same rate, keeping the equilibrium the same.
- Thu Jan 21, 2021 8:36 pm
- Forum: Phase Changes & Related Calculations
- Topic: Heat and temperature change
- Replies: 6
- Views: 168
Re: Heat and temperature change
The added energy (heat) goes straight to breaking the hydrogen bonds.
- Thu Jan 21, 2021 8:30 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 1: Lecture cutoff
- Replies: 8
- Views: 268
Re: Midterm 1: Lecture cutoff
I'm sure he will clarify this tomorrow in lecture or send out an email closer to the exam date.
- Thu Jan 21, 2021 8:27 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Buffers?
- Replies: 3
- Views: 121
Re: Buffers?
I was wondering the same thing. I am assuming that he will either mention them or go over them in his next few lectures.
- Thu Jan 21, 2021 8:26 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Studying for Midterm #1
- Replies: 63
- Views: 2406
Re: Studying for Midterm #1
He usually mentions before exams that some questions were pulled from the textbook as an incentive to go through the textbook questions. I would highly recommend doing them.
- Thu Jan 21, 2021 8:23 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Sapling Week 2 #5 Explanation
- Replies: 5
- Views: 232
Re: Sapling Week 2 #5 Explanation
The way I saw this was that by solving for B with the Kb equation, you found B at equilibrium, however we needed the initial value for B to get the correct % protonated. B+X= initial value of B
- Thu Jan 21, 2021 8:21 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Strong acids & bases
- Replies: 4
- Views: 204
Re: Strong acids & bases
This is where the Ka/Kb values come into play. You can tell you have a strong acid because the Ka or Kb value will be large. It is vice versa for weak acids and bases.
- Thu Jan 21, 2021 8:18 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Week 2 Sapling #5
- Replies: 9
- Views: 248
Re: Week 2 Sapling #5
You will not get the correct answer if you disregard x. You need to add the x value to the equilibrium value of B ti find the initial value of b. If you disregard x, your percent protonation will be thrown off.
- Wed Jan 20, 2021 4:21 pm
- Forum: Student Social/Study Group
- Topic: Calculators
- Replies: 52
- Views: 3064
Re: Calculators
I would try to get a scientific calculator because it is preferred, but if graphing calculator is your only option then it is acceptable. They are mainly just worried about students storing information in the calculator before the exam.
- Sun Jan 17, 2021 10:17 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Total Pressure
- Replies: 26
- Views: 1830
Re: Total Pressure
^^^ to find this just solve the ice table and add up all of the pressures
- Fri Jan 15, 2021 12:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Discussion section for Week 3
- Replies: 2
- Views: 116
Re: Discussion section for Week 3
Last quarter when there was a holiday(if I remember correctly) discussion sections were still held except for the ones scheduled for on that holiday.
- Fri Jan 08, 2021 1:48 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sapling Glitch
- Replies: 1
- Views: 108
Re: Sapling Glitch
Same thing happened to me, so definitely check.
- Fri Jan 08, 2021 1:46 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Change in Pressure
- Replies: 9
- Views: 193
Re: Change in Pressure
Picture the equation C=n/v When you are increasing pressure you are essentially decreasing the volume(picture the piston he used as an example) So because the denominator (volume) decreases, the concentration(C) will increase. Keep in mind that this is not the case when adding an inert gas, the way ...
- Fri Jan 08, 2021 1:42 pm
- Forum: Ideal Gases
- Topic: Reviewing PV=NRT
- Replies: 7
- Views: 327
Re: Reviewing PV=NRT
If you click on the table of contents on the online textbook and navigate to the part "odd numbered exercises" you will find the answers. I am not sure if he provides answers for the even numbered exercises.
- Fri Jan 08, 2021 1:40 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Increasing Volume in Change of Pressure
- Replies: 7
- Views: 139
Re: Increasing Volume in Change of Pressure
The picture of a piston Lavelle provided and imagining what it will do to the concentration really helped me in grasping this.
- Fri Jan 08, 2021 1:37 pm
- Forum: Ideal Gases
- Topic: Units of Temperature
- Replies: 82
- Views: 3343
Re: Units of Temperature
Javier Perez M 1H wrote:So when using PV=NRT temperature is supposed to be inputted in Kelvin? How come though fro most of the questions so far we are being given temperature in Celcius?
I have noticed this as well...maybe it's just good conversion practice.
- Thu Dec 10, 2020 11:13 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted vs Lewis Acids and Bases
- Replies: 8
- Views: 539
Re: Bronsted vs Lewis Acids and Bases
Almost all of the textbook questions regarding this asked specifically for you to identify the Bronsted version or specifically for you to identify the Lewis version, so I think this is the typical format. You can do either by examining the reaction, but I would respond with what the question asks.
- Thu Dec 10, 2020 10:15 pm
- Forum: Student Social/Study Group
- Topic: Anxiety
- Replies: 109
- Views: 6858
Re: Anxiety
EXCERCISE! I know you have seen Lavelle advocate for this, but it is super important and helpful. Exercising releases feel-good endorphins that help ease anxiety. It also helps your brain study and retain information...the more oxygen and blood that the brain gets, the better it will perform. Gettin...
- Thu Dec 10, 2020 10:11 pm
- Forum: Student Social/Study Group
- Topic: Studying
- Replies: 13
- Views: 799
Re: Studying
Fun Fact: The organic chemistry tutor on YouTube got his bachelors degree here at UCLA :)
All the more reason to watch him
All the more reason to watch him
- Wed Dec 09, 2020 11:50 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Bruin Cast Lectures
- Replies: 5
- Views: 296
Re: Bruin Cast Lectures
Sometimes the lectures decide to just give me an error code right in the middle of them. First I try the other link(lower bitrate) and if that doesn't work I use the UCLA VPN which tends to work.
- Wed Dec 09, 2020 11:46 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Question
- Replies: 6
- Views: 297
Re: Final Question
Most of what we covered on acids and bases should be fair game...I'd say the only parts that aren't are the ones he prefaced with "we'll cover this in 14b" in the lectures.
- Wed Dec 09, 2020 2:53 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Chem Final
- Replies: 7
- Views: 340
Re: Chem Final
Does anyone know what the format of the test is going to be like as well as how long the test is going to be? It is going to follow the same format of the previous midterms. It will be 30 multiple choice questions, and it will be 1 hour and 30 minutes (plus 5 extra minutes). To go off of this, Lave...
- Wed Dec 09, 2020 2:50 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted Classification
- Replies: 2
- Views: 126
Re: Bronsted Classification
A bronsted acid donates proton, a Lewis acid accepts electrons.
A bronsted base accepts proton, a Lewis base donates electrons.
A bronsted base accepts proton, a Lewis base donates electrons.
- Tue Dec 08, 2020 1:41 pm
- Forum: Significant Figures
- Topic: sig fig
- Replies: 20
- Views: 985
Re: sig fig
Will sig figs be important on the final? Hi! They will be included in the final since it is cumulative and they take an important part on some of the calculations. I am not sure how prominent they will be on the final, but I would recommend going over it. Hope this helps! My TA mentioned that they ...
- Tue Dec 08, 2020 1:37 pm
- Forum: Student Social/Study Group
- Topic: Finals Review
- Replies: 4
- Views: 297
Re: Finals Review
Sometimes they are posted on here, sometimes on their TA site, if not you can contact them and ask for it.
- Tue Dec 08, 2020 1:36 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Ebook/Textbook problems
- Replies: 9
- Views: 608
Re: Ebook/Textbook problems
The textbook is glitchy for me too. If I wait a little it comes back, if not then I close the browser and go through ccle -> sapling -> textbook and that seems to load it.
- Tue Dec 08, 2020 1:34 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Shape
- Replies: 6
- Views: 416
Re: Shape
I think it will be made clear in the question what they are specifically asking for.
- Mon Dec 07, 2020 10:26 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: -OH vs OH-
- Replies: 36
- Views: 1227
Re: -OH vs OH-
I have noticed that he uses them interchangeably as well.
- Mon Dec 07, 2020 10:24 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 10 Review Sessions
- Replies: 7
- Views: 382
Re: Week 10 Review Sessions
I believe they are all shooting for an hour but I'm assuming it depends.
- Mon Nov 23, 2020 8:46 pm
- Forum: *Particle in a Box
- Topic: Video explanation for people interested?
- Replies: 1
- Views: 429
- Mon Nov 23, 2020 8:42 pm
- Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
- Topic: ionic liquids
- Replies: 8
- Views: 902
Re: ionic liquids
An ionic liquid is a salt in the liquid state that are liquid at unusually low temperatures.
- Mon Nov 23, 2020 8:39 pm
- Forum: Hybridization
- Topic: Hybridization Application
- Replies: 2
- Views: 65
Re: Hybridization Application
If a central atom has to bond to more than one outer atom, especially if more than one outer atom is different, it has to hybridize.
- Fri Nov 20, 2020 7:28 am
- Forum: Student Social/Study Group
- Topic: grade worries
- Replies: 119
- Views: 14555
Re: grade worries
Also... give yourself a break. We all made it to UCLA so we are of course going to be super concerned with grades and such, but we're going through a big transition and learning how college, quarter system, etc. works. Being online doesn't help either.
- Thu Nov 19, 2020 11:34 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Exercise 2A. 3b
- Replies: 2
- Views: 190
Re: Exercise 2A. 3b
Correct. Or, without the [Ar], it is 1s2 2s2 2p6 3s2 3p6 3d10 4s2
- Thu Nov 19, 2020 9:27 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles (<109 or 104.5, etc)
- Replies: 8
- Views: 237
Re: Bond Angles (<109 or 104.5, etc)
He mentioned in lectures that it is not necessarily important to memorize/calculate these bond angles, but rather be able to predict how they change depending on structure.
- Thu Nov 19, 2020 9:26 am
- Forum: Lewis Structures
- Topic: Textbook 2B.1
- Replies: 4
- Views: 227
Re: Textbook 2B.1
It minimizes formal charges and thus is more stable.
- Thu Nov 19, 2020 9:24 am
- Forum: Student Social/Study Group
- Topic: CHEM 14B Time Conflict
- Replies: 13
- Views: 622
Re: CHEM 14B Time Conflict
Another option is if the lectures do end up being live and/or exams are during lecture time, you can ask around and see if there is anyone willing to switch with you.
- Sun Nov 15, 2020 9:52 pm
- Forum: Dipole Moments
- Topic: 3F Exercises Question 5
- Replies: 2
- Views: 32
Re: 3F Exercises Question 5
CHI3 is a bigger atom compared to CHF3. That makes it more polarizable and thus has a stronger London Dispersion Force.
- Sun Nov 15, 2020 3:16 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: London dispersion forces for larger atoms
- Replies: 1
- Views: 40
Re: London dispersion forces for larger atoms
This is because in bigger atoms the valence electrons are less tightly held and can therefore more easily form temporary dipoles. Bigger Atoms=Higher polarizability=more distortions=more London dispersion
- Sun Nov 15, 2020 3:08 pm
- Forum: Electronegativity
- Topic: Electronegativity v Electron Affinity
- Replies: 4
- Views: 223
Re: Electronegativity v Electron Affinity
Electronegativity is a property of an atom that shows how well it can attract electrons. Electron affinity is the energy released when an electron is added to a neutral atom. They are loosely related and have the same trend on the periodic table but can not be used interchangeably.
- Sun Nov 15, 2020 3:03 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Spherical Polar coordinates
- Replies: 1
- Views: 122
Re: Spherical Polar coordinates
I was wondering this too. I think I remember in one of his quantum mechanics lectures that we do not need to know this in detail. Does anyone else remember this or have a better answer?
- Sun Nov 15, 2020 2:57 pm
- Forum: Trends in The Periodic Table
- Topic: Trends in Periodic Table Tips
- Replies: 12
- Views: 686
Re: Trends in Periodic Table Tips
Instead of remembering the trends, I just try to remember the characteristics of the corner elements for that trend. For the size trend, I know bottom left is biggest and top right is smallest, so I can figure out that it increases down a group and decreases across a period. It works for me but ever...
- Sun Nov 15, 2020 11:22 am
- Forum: Student Social/Study Group
- Topic: Post Midterm Blues
- Replies: 71
- Views: 3211
Re: Post Midterm Blues
Now you know at what level you need to prepare for this coming midterm and future tests. As long as you know you're doing your best its the learning that counts and not the grade.
- Sun Nov 15, 2020 10:59 am
- Forum: Administrative Questions and Class Announcements
- Topic: #Questions on Midterm 2
- Replies: 6
- Views: 291
Re: #Questions on Midterm 2
I am not sure, but I am assuming it will be relatively the same as midterm 1. However, this unit involves less calculations so they might be able to squeeze more questions in the time frame.
- Sun Nov 15, 2020 10:58 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electrostatic Potential Energy
- Replies: 3
- Views: 191
Re: Electrostatic Potential Energy
It is the energy needed to move a charge against an electric field.
- Mon Nov 09, 2020 10:53 am
- Forum: Student Social/Study Group
- Topic: Mid-quarter Check in
- Replies: 67
- Views: 3162
Re: Mid-quarter Check in
The way Lavelle has organized this class makes online learning a little more manageable, however they were NOT kidding when they warned us that quarters are fast paced.
- Sun Nov 01, 2020 2:28 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Chem Community Posts
- Replies: 10
- Views: 242
Re: Chem Community Posts
As long as it relates to chemistry, any post is a valid post. This can include asking a question responding to a question, or adding onto somebody else's thoughts.
- Sun Nov 01, 2020 2:27 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: The equation
- Replies: 7
- Views: 652
Re: The equation
The Heisenberg equation relates to indeterminacy in position or momentum of objects. I think you are thinking of the Rydberg equation.
- Sun Nov 01, 2020 2:25 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Nodal planes
- Replies: 5
- Views: 217
Re: Nodal planes
A nodal plane is a region where the probability of finding an electron is 0.
- Sun Nov 01, 2020 2:23 pm
- Forum: Properties of Light
- Topic: How to remember what v is in equations
- Replies: 46
- Views: 7094
Re: How to remember what v is in equations
A normal v is velocity and an italicized v is frequency
- Thu Oct 29, 2020 12:28 pm
- Forum: DeBroglie Equation
- Topic: Problem 1B.5
- Replies: 3
- Views: 179
Re: Problem 1B.5
First convert KeV to J. I did this by multiplying 140.511 KeV by 1000 to get 140,511 eV. Then I converted that to J by multiplying by 1.602x10^-19. Now that you have energy in J, you can rearrange the equation E=HC/Lambda to make it Lambda=HC/E. Now just plug in your constants and your energy value ...
- Thu Oct 22, 2020 9:20 pm
- Forum: Student Social/Study Group
- Topic: How are you studying?
- Replies: 204
- Views: 17461
Re: How are you studying?
I rewatch lecturess, go through the focus modules, and work my way through the sapling and textbook problems addressing any concerns I may have.
- Thu Oct 22, 2020 9:18 pm
- Forum: Student Social/Study Group
- Topic: Midterm Grading and Scientific Notation
- Replies: 2
- Views: 161
Re: Midterm Grading and Scientific Notation
We will not be submitting written work for the exam. He stated that there will be certain questions broken down that will represent what would be partial credit ordinarily.
- Thu Oct 22, 2020 3:08 pm
- Forum: Einstein Equation
- Topic: Textbook problem B.7
- Replies: 2
- Views: 177
Re: Textbook problem B.7
Make sure to convert your nm units in problem A to get 5.89x10^-7 m
- Thu Oct 22, 2020 3:06 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Practice Problems in Outline 2
- Replies: 2
- Views: 81
Re: Practice Problems in Outline 2
He said it covers up to 1D.2 in the textbook, so I think you are right in your thinking.
- Thu Oct 22, 2020 3:04 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Where can I buy a webcam for a reasonable price?
- Replies: 60
- Views: 3522
Re: Where can I buy a webcam for a reasonable price?
I found one on amazon for $15 and free shipping with prime!
- Sun Oct 18, 2020 5:12 pm
- Forum: Significant Figures
- Topic: Sig Figs
- Replies: 5
- Views: 312
Re: Sig Figs
Another helpful hint is to not round to sig figs until you get the answer. This will keep the value of your answer as accurate as possible.
- Fri Oct 16, 2020 8:00 am
- Forum: Student Social/Study Group
- Topic: iPad vs Paper notes
- Replies: 32
- Views: 7536
Re: iPad vs Paper notes
I used to take notes on an iPad, however I didn't end up liking it. It was hard to get the pen and paper feel which for me is super important for memorization. I just stuck with a good ole fashion notebook.
- Wed Oct 14, 2020 12:18 pm
- Forum: Properties of Light
- Topic: 1st worked example in lecture
- Replies: 4
- Views: 124
Re: 1st worked example in lecture
Dr. Lavelle stated in the lecture that both the formulas and constants will be provided for us, however it is our job to know how to rearrange the formulas.
- Wed Oct 14, 2020 11:01 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Can an electron stay in its excited state? [ENDORSED]
- Replies: 18
- Views: 1646
Re: Can an electron stay in its excited state? [ENDORSED]
I don't believe so. Electrons only stay in an excited state for a very short amount of time. Usually a couple of nanoseconds.
- Wed Oct 14, 2020 10:08 am
- Forum: Administrative Questions and Class Announcements
- Topic: Petition to Bring Music Back To Lectures [ENDORSED]
- Replies: 34
- Views: 1276
Re: Petition to Bring Music Back To Lectures [ENDORSED]
Jack Johnson was a good touch today. Dr. Lavelle is a vibe.
- Thu Oct 08, 2020 9:30 pm
- Forum: Limiting Reactant Calculations
- Topic: L35 Fundamentals Textbook Problem
- Replies: 2
- Views: 116
Re: L35 Fundamentals Textbook Problem
Note: I researched this question and found this on this platform from 2015. First you convert the 2.50 t of NaBr to grams using the conversion factor 1.0 x 10^6 grams= 1 ton. Then you find the molar mass of NaBr (102.89g) and divide the grams of NaBr by NaBr's molar mass. Next, find the mole ration ...
- Thu Oct 08, 2020 9:24 pm
- Forum: SI Units, Unit Conversions
- Topic: Acronym for prefixes
- Replies: 7
- Views: 468
Re: Acronym for prefixes
That's great! I've also heard this one: Grandma Makes Kids Drink Cold Milk Until Night Passes
- Wed Oct 07, 2020 5:59 pm
- Forum: Limiting Reactant Calculations
- Topic: Actual and Theoretical yields
- Replies: 14
- Views: 432
Re: Actual and Theoretical yields
Another question regarding this, will the actual yield always be given when asking to calculate percentage yield?
- Tue Oct 06, 2020 8:50 pm
- Forum: Student Social/Study Group
- Topic: GroupMes for Chem 14A Fall 2020
- Replies: 24
- Views: 795
Re: GroupMes for Chem 14A Fall 2020
We also have a big discord!
https://discord.gg/qepmEn3
https://discord.gg/qepmEn3
- Tue Oct 06, 2020 8:48 pm
- Forum: Properties of Light
- Topic: Vaccum?
- Replies: 7
- Views: 173
Re: Vaccum?
"A vacuum can be created by removing air from a space using a vacuum pump or by reducing the pressure using a fast flow of fluid, as in Bernoulli's principle." It's a condition well below normal atmospheric pressure and is measured in units of pressure (pascal).