Search found 118 matches
- Fri Mar 12, 2021 12:20 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Lecture example?
- Replies: 5
- Views: 442
Re: Lecture example?
Thank you that makes sense!
- Fri Mar 12, 2021 12:18 pm
- Forum: Student Social/Study Group
- Topic: Planning on dorming in the Fall?
- Replies: 61
- Views: 4600
Re: Planning on dorming in the Fall?
I feel like I would only want to move back in the dorms if we were able to have roommates!
- Fri Mar 12, 2021 12:13 pm
- Forum: Student Social/Study Group
- Topic: How are y'all doing?
- Replies: 46
- Views: 3279
Re: How are y'all doing?
I'm not doing that well :'( I have very little motivation at this point.
- Fri Mar 12, 2021 12:11 pm
- Forum: Student Social/Study Group
- Topic: Classes for next quarter?
- Replies: 165
- Views: 22711
Re: Classes for next quarter?
I plan on taking ChemBL, Stats 13 and as of now Greek Mythology for a GE. I'm on the waitlist for Anthro.2 but I really hope I get into that class :'(
- Fri Mar 12, 2021 12:06 pm
- Forum: Student Social/Study Group
- Topic: Balance / Self Care Tips
- Replies: 62
- Views: 4396
Re: Balance / Self Care Tips
I try to go outside for a couple hours a day and just breathe fresh air and let the sun hit me :)
- Sun Mar 07, 2021 9:09 pm
- Forum: Ideal Gases
- Topic: gas constant R
- Replies: 18
- Views: 1814
Re: gas constant R
I'm pretty sure you would have to know the units for pressure.
- Sun Mar 07, 2021 9:05 pm
- Forum: General Rate Laws
- Topic: Units
- Replies: 10
- Views: 511
Re: Units
There are different units for each rate of law, this way the units can cancel out.
- Sun Mar 07, 2021 9:02 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Solutions of Galvanic Cells
- Replies: 2
- Views: 261
Re: Solutions of Galvanic Cells
I was wondering the same thing^
- Sun Mar 07, 2021 9:00 pm
- Forum: Administrative Questions and Class Announcements
- Topic: [CHEM 14B KARAOKE]
- Replies: 68
- Views: 7753
Re: [CHEM 14B KARAOKE]
There were so many great performances!
- Sun Mar 07, 2021 8:58 pm
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: pH
- Replies: 17
- Views: 1001
Re: pH
The pH measures the concentration of hydronium and it lets us know the pH level.
- Sun Feb 28, 2021 10:27 pm
- Forum: Student Social/Study Group
- Topic: Fave food
- Replies: 266
- Views: 52032
Re: Fave food
My go to snack is HOT chips!!
- Sun Feb 28, 2021 10:23 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Step up vs workshops
- Replies: 18
- Views: 1228
Re: Step up vs workshops
For step up sessions they are typically more thorough on the content taught in lecture and workshops are more for students who know the content they just want more practice.
- Sun Feb 28, 2021 10:01 pm
- Forum: Balancing Redox Reactions
- Topic: states of matter
- Replies: 58
- Views: 2951
Re: states of matter
Yes, I would include the states of matter.
- Sun Feb 28, 2021 9:59 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chemistry Community Points
- Replies: 24
- Views: 1314
Re: Chemistry Community Points
Yes, you can still post but you only get a maximum of 50 points :)
- Sun Feb 28, 2021 9:51 pm
- Forum: Ideal Gases
- Topic: Chem BL
- Replies: 107
- Views: 11839
Re: Chem BL
Im taking Chem BL next quarter and I'm a bit nervous!
- Thu Feb 18, 2021 12:42 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Relationship between Work and Entropy
- Replies: 4
- Views: 346
Re: Relationship between Work and Entropy
I'm not really sure but your assumption seems reasonable, hopefully someone else can answer this :)
- Thu Feb 18, 2021 12:40 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Bomb Calorimeter
- Replies: 14
- Views: 4961
Re: Bomb Calorimeter
Thats a good question! I would assume so because a bomb calorimeter is an isolated system therefore matter and energy cannot enter or leave.
- Thu Feb 18, 2021 12:37 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Irreversible vs. Reversible Work Functions
- Replies: 6
- Views: 545
Re: Irreversible vs. Reversible Work Functions
A reversible work is when there is an infinitely small change in a variable, which could be external pressure, you would use the equation w = nRTln(v2/v1). Irreversible work is when a variable does not go through infinitely small changes, so you would use the equation w = -P△V. This is helpful, tha...
- Thu Feb 18, 2021 12:18 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Constant Volume
- Replies: 15
- Views: 959
Re: Constant Volume
The difference between Cv and Cp is that Cv is when volume is constant and Cp is when pressure is constant.
- Thu Feb 18, 2021 12:16 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: degeneracy and entropy
- Replies: 5
- Views: 373
Re: degeneracy and entropy
^^Yes, Kb is on the constants and equations sheet!
- Sat Feb 13, 2021 2:46 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Can We Review our Exams?
- Replies: 69
- Views: 4428
Re: Can We Review our Exams?
You are able to review them with any TA.
- Sat Feb 13, 2021 2:45 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Gas Entropy
- Replies: 14
- Views: 956
Re: Gas Entropy
When going from a gas to a liquid there is "more order" therefore decreasing entropy.
- Sat Feb 13, 2021 2:42 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Is it necessary to memorize Cp,m or Cv,m values? [ENDORSED]
- Replies: 26
- Views: 1558
Re: Is it necessary to memorize Cp,m or Cv,m values? [ENDORSED]
These values are on the equation sheet :)
- Sat Feb 13, 2021 2:41 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Difference between ΔS° and ΔS
- Replies: 9
- Views: 3178
Re: Difference between ΔS° and ΔS
Thank you this makes sense!
- Sat Feb 13, 2021 2:39 pm
- Forum: Student Social/Study Group
- Topic: Thoughts on Upcoming Midterm 2
- Replies: 41
- Views: 2125
Re: Thoughts on Upcoming Midterm 2
I feel super nervous as well :'(
- Sun Feb 07, 2021 2:01 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Entropy
- Replies: 27
- Views: 1310
Re: Entropy
Mackenzie Stockton 2H wrote:entropy (S) ---> S= KblnW1W2
its helpful to think of entropy as a measure of the disorder of a system
Thank you for putting it simply! :)
- Sun Feb 07, 2021 1:52 am
- Forum: Student Social/Study Group
- Topic: Study tips for thermo
- Replies: 14
- Views: 1038
Re: Study tips for thermo
I recommended Professor Dave on YouTube!
- Sun Feb 07, 2021 1:50 am
- Forum: Administrative Questions and Class Announcements
- Topic: tips if you're struggling!
- Replies: 77
- Views: 6494
Re: tips if you're struggling!
Thank you for the tips!
- Sun Feb 07, 2021 1:45 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: R Constant
- Replies: 91
- Views: 8781
Re: R Constant
Yes, pay attention to the units and match them up!
- Sun Feb 07, 2021 1:41 am
- Forum: Ideal Gases
- Topic: Chem BL
- Replies: 107
- Views: 11839
Re: Chem BL
I'm also debating on taking Chem BL and C together.... I just don't want to take on more than I can handle and risk not doing well in either one.
- Sun Feb 07, 2021 1:35 am
- Forum: General Science Questions
- Topic: Careless Mistakes
- Replies: 54
- Views: 4490
Re: Careless Mistakes
This is totally understandable, especially since we have to make sure we have enough time to finish our exams because there is a time limit.
- Sun Feb 07, 2021 1:33 am
- Forum: Student Social/Study Group
- Topic: Study routine.
- Replies: 51
- Views: 3427
Re: Study routine.
Definitely attend as many UA session as possible!
- Sun Feb 07, 2021 1:32 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Closed Systems
- Replies: 14
- Views: 715
Re: Closed Systems
In a closed system, energy can be transferred into and out of the system, however, matter can cannot.
- Sun Feb 07, 2021 1:27 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: How to know the sign for work
- Replies: 26
- Views: 1115
Re: How to know the sign for work
When a work is done BY the system work is negative, when work is done ON the system work is positive.
- Mon Jan 25, 2021 6:15 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Enthalpy changes
- Replies: 6
- Views: 315
Re: Enthalpy changes
Just remember that Delta H = Delta H of products - Delta H of reactants, and if your answer ends up being a positive value the reaction is endothermic and if the value is negative it is exothermic.
- Mon Jan 25, 2021 6:12 am
- Forum: Student Social/Study Group
- Topic: UA Sessions
- Replies: 2
- Views: 222
Re: UA Sessions
You can find the UA sessions on Lavelle's website under "Peer Learning Sessions and Step-Up Program".
- Mon Jan 25, 2021 6:11 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Hess's Law
- Replies: 58
- Views: 3607
Re: Hess's Law
Hess's Law just states that enthalpy is a state property and therefore is additive.
- Mon Jan 25, 2021 6:07 am
- Forum: Phase Changes & Related Calculations
- Topic: Sublimation
- Replies: 13
- Views: 1799
Re: Sublimation
Since sublimation is a solid changing into a gas, you need to add heat to break those bonds in order for it to become a gas, therefore making this reaction endothermic because heat is being absorbed by the solid.
- Mon Jan 25, 2021 6:01 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ICE Chart Question
- Replies: 26
- Views: 1702
Re: ICE Chart Question
You would still have to include the coefficient 2 as an exponent so it would be [-2x]^2 in your equilibrium equation.
I know it seems like it is taking it into account two times but I'm honestly not sure exactly why...
I know it seems like it is taking it into account two times but I'm honestly not sure exactly why...
- Mon Jan 25, 2021 5:56 am
- Forum: Phase Changes & Related Calculations
- Topic: Endothermic v. Exothermic
- Replies: 139
- Views: 19748
Re: Endothermic v. Exothermic
Endothermic will always be a positive enthalpy value and exothermic will always be a negative enthalpy value.
- Mon Jan 18, 2021 4:25 pm
- Forum: Ideal Gases
- Topic: reversing reactions
- Replies: 83
- Views: 6646
Re: reversing reactions
When you reverse the reaction, K simply becomes the inverse of itself (1/K).
- Mon Jan 18, 2021 4:22 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: How to Determine acidic/basic/neutral salts
- Replies: 2
- Views: 387
Re: How to Determine acidic/basic/neutral salts
A salt can have acidic or basic properties if it is dissolved in water. Since the salt is made up of a cation and an anion, they both can be either conjugate bases or conjugate acids that, when dissolved in water, will affect the pH. For example, with NaF, it is made up of Na+ and F-. Na+ is the co...
- Mon Jan 18, 2021 4:20 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q and K
- Replies: 46
- Views: 2123
Re: Q and K
K is calculated when the reaction is at equilibrium at a certain temperature, while Q can be calculated at anytime when the reaction is not at equilibrium at that same temperature . By solving for Q and comparing it to K you can determine which way the reaction needs to shift, if there is more react...
- Mon Jan 18, 2021 4:16 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Moles vs Concentrations in ICE Box
- Replies: 21
- Views: 1061
Re: Moles vs Concentrations in ICE Box
I think it's just easier to put in Moles in the beginning when doing an ICE Box, just so you don't forget to convert the concentrations in the end.
- Mon Jan 18, 2021 4:13 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Sapling week2 Q9/10
- Replies: 3
- Views: 149
Re: Sapling week2 Q9/10
Yes can someone please help explain this, I had a hard time understanding this as well.
- Mon Jan 18, 2021 4:12 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Week 2 Sapling Hw #2
- Replies: 8
- Views: 517
Re: Week 2 Sapling Hw #2
Xinying Wang_3C wrote:Basically, the percentage ionized is the [dissociated]/[original reactant]. So you would use the ICE Table to solve for the [ H+] as usual. and just use that value to calculate [H+]/0.121 M. Hope this helps.
Yes you would do this and then multiply by 100 to get the percent ionization.
- Wed Jan 13, 2021 8:18 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Increase in Pressure
- Replies: 31
- Views: 966
Re: Increase in Pressure
I believe this only applies to gases.
- Wed Jan 13, 2021 8:16 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Class on 1/18/21 Holiday
- Replies: 9
- Views: 539
Re: Class on 1/18/21 Holiday
I will assume no because in fall quarter we didn't have the veteran's day off. If your discussion is that day though it might be cancelled. I agree^ He still posted a lecture under the media tab for Veteran's Day since we do not have live lectures I don't think he'll give us the day off from a lect...
- Wed Jan 13, 2021 8:14 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Participation
- Replies: 18
- Views: 1072
Re: Participation
We get points for both!
- Wed Jan 13, 2021 8:13 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Lecture Question
- Replies: 9
- Views: 589
Re: Lecture Question
I was honestly confused by that too because he then goes on by saying that the equilibrium constant for this reaction is Ka because we have a weak acid in our reaction.
- Wed Jan 13, 2021 8:11 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Distinguishing weak acids and weak bases
- Replies: 3
- Views: 286
Re: Distinguishing weak acids and weak bases
How I think of its is "Bases want H's" so when a base reacts with water, that reaction's product will include an OH- because "the base wanted the H and took it from the water" and therefore forms hydroxide(OH-). When thinking of acids I just think acids donate protons so when an ...
- Wed Jan 13, 2021 8:05 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kw= 1.0 x 10^-14
- Replies: 11
- Views: 1777
Re: Kw= 1.0 x 10^-14
This value is a constant and is given to us because like everyone else has said, it is a value that was experimentally determined.
- Wed Jan 06, 2021 8:56 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Difference between "sits" and "shifts"
- Replies: 5
- Views: 322
Re: Difference between "sits" and "shifts"
I believe you are correct I was wondering the same thing because I ran into another post that confused me because of the wording that was used, but I do believe yo0u are correct!
- Wed Jan 06, 2021 8:46 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sapling Homework
- Replies: 6
- Views: 345
Re: Sapling Homework
Yes homework is on Sapling and there are unlimited tries for each problem!!
- Wed Jan 06, 2021 8:45 pm
- Forum: Ideal Gases
- Topic: Sapling Homework
- Replies: 22
- Views: 1076
Re: Sapling Homework
This is also a sapling related question but I'm having trouble figuring out where to go for the Chem14B homework... I took 14A last quarter so all I see is my work from Chem14A. Does anyone know how to access the Chem14B homework?
- Wed Jan 06, 2021 8:31 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q and K trend/similarity
- Replies: 8
- Views: 382
Re: Q and K trend/similarity
Do the Q and the K values follow the same trend/pattern when describing on whether a system will favor reactants/products? For example in the lecture, it states if K is small, then it would favor the products (shift right) since there's more reactants at equilibrium. And if Q is smaller than K, the...
- Wed Jan 06, 2021 8:23 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Equilibrium Constant
- Replies: 8
- Views: 677
Re: Equilibrium Constant
If K is less than 1 then that means at equilibrium the reactant is larger than the product. Therefore, the reactant is being favored.
- Tue Dec 15, 2020 6:06 pm
- Forum: Student Social/Study Group
- Topic: How are you?
- Replies: 154
- Views: 19705
Re: How are you?
I'm so happy the final for this class is over since its my hardest class!! I can't wait for Winter break so I can relax and not stress about school for 2 weeks!! :)
- Tue Dec 15, 2020 6:04 pm
- Forum: Student Social/Study Group
- Topic: Grades
- Replies: 29
- Views: 1636
Re: Grades
We have until Thursday morning to complete our Week 10 posts on Chemistry Community.
- Tue Dec 15, 2020 6:01 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 675871
Re: Saying Thank You to Dr. Lavelle
Thank you for setting up the many hours of review and study sessions that are SUPER helpful throughout the quarter, please keep doing this! :)
- Tue Dec 15, 2020 5:56 pm
- Forum: Student Social/Study Group
- Topic: Winter Break Plans
- Replies: 45
- Views: 2871
Re: Winter Break Plans
That sounds like it will be a blast!! I will be visiting my mom for Christmas in Texas and just relaxing as much as I can before I go back to stressing about school!
- Tue Dec 15, 2020 5:54 pm
- Forum: Student Social/Study Group
- Topic: Staying Motivated
- Replies: 38
- Views: 2193
Re: Staying Motivated
I’m very reward oriented, so to motivate yourself to watch the lectures or do homework I recommend giving yourself little gifts when you complete the tasks! For example if you watch a couple of lectures and do the work problems, then you get to order a pizza or do a facemask or something you enjoy....
- Fri Dec 11, 2020 1:49 am
- Forum: Administrative Questions and Class Announcements
- Topic: Unable to view the lectures
- Replies: 12
- Views: 763
Re: Unable to view the lectures
I had the same problem, I just waited it out :/
- Fri Dec 11, 2020 1:48 am
- Forum: Student Social/Study Group
- Topic: Studying
- Replies: 13
- Views: 1032
Re: Studying
Professor Dave really helped me! :)
- Fri Dec 11, 2020 1:47 am
- Forum: Student Social/Study Group
- Topic: Studying
- Replies: 13
- Views: 1032
Re: Studying
Ryan_Page_1J wrote:Fun Fact: The organic chemistry tutor on YouTube got his bachelors degree here at UCLA :)
All the more reason to watch him
Wow really?! Great fun fact lol!
- Fri Dec 11, 2020 1:46 am
- Forum: Polyprotic Acids & Bases
- Topic: How can you tell
- Replies: 18
- Views: 1083
Re: How can you tell
Shail Avasthi 2C wrote:If an acid has more than one hydrogen which it can dissociate, it is polyprotic.
This makes sense, thank you!
- Fri Dec 11, 2020 1:43 am
- Forum: Polyprotic Acids & Bases
- Topic: Which one is more acidic: H3PO3 or H3PO4
- Replies: 17
- Views: 1369
Re: Which one is more acidic: H3PO3 or H3PO4
Haochen He 3L wrote:Hi! I am not sure how to determine and compare the acidic strength between H3PO3 and H3PO4.
Could someone explain it?
H3PO4 is more acidic since this compound has an extra O and resonance, therefore it is more stable meaning it is more acidic.
- Fri Dec 11, 2020 1:39 am
- Forum: Conjugate Acids & Bases
- Topic: Sapling #3
- Replies: 14
- Views: 1012
Re: Sapling #3
Hello! For the conjugate acid of HSO4- I put H3O+. Is that not the conjugate acid? When thinking about what it is asking for, the conjugate acid, first think about what that means. A base turns into a conjugate acid because when doing the reverse of the chemical reaction it would go back to being a...
- Fri Dec 11, 2020 1:34 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Sapling #5
- Replies: 5
- Views: 393
Re: Sapling #5
It's okay, its totally understandable!
pH=-log([H+])...so to find [H+] when given pH you do the reverse which would be...[H+]=10^-pH
pH=-log([H+])...so to find [H+] when given pH you do the reverse which would be...[H+]=10^-pH
- Thu Dec 03, 2020 3:01 pm
- Forum: General Science Questions
- Topic: study methods/recs
- Replies: 37
- Views: 2690
Re: study methods/recs
Lea Ozdere 1A wrote:Does anyone have good studying tips for the final? Other than the sapling and textbook problems. Any methods or sites that are really helpful?
UA Sessions are SUPER helpful, HIGHLY recommended!!! I would also recommend the review session Professor Lavelle recently organized.
- Thu Dec 03, 2020 2:59 pm
- Forum: Student Social/Study Group
- Topic: Big Sad: Midterm 2
- Replies: 86
- Views: 9530
Re: Big Sad: Midterm 2
After taking the second midterm, I just realized how many mistakes I made and how probable it is that I am not going to pass it haha. While there are students worried about getting an A-, I am worried about getting a passing grade haha. For those of us who have taken it, how are you feeling? I feel...
- Thu Dec 03, 2020 2:51 pm
- Forum: Naming
- Topic: Oxidation State
- Replies: 16
- Views: 785
Re: Oxidation State
The oxidation state is the number of electrons lost or gained in a chemical compound.
- Thu Dec 03, 2020 2:47 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: homework 9 #5
- Replies: 6
- Views: 401
Re: homework 9 #5
I'm having the same problem! If anyone would mind explaining that would be super helpful! I thought it was 4, but it says it is incorrect.
- Thu Dec 03, 2020 2:45 pm
- Forum: Naming
- Topic: Sapling Q1
- Replies: 20
- Views: 1109
Re: Sapling Q1
From what you gave it seems like there are three chlorides so maybe the oxidation state of Cobalt is (III) and not (II). So it would be tetraaminechlorocobalt(III) chloride. For example, [Co(NH3)6] Cl3 which is HexaammineCobalt(III) Chloride. I also had an issue with this problem, make sure you use...
- Wed Nov 25, 2020 9:13 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem 14B Lectures
- Replies: 15
- Views: 884
Re: Chem 14B Lectures
He stated in an email that he is not sure if he will be able to continue asynchronous lectures for Winter quarter like he has for this Fall quarter. He may not get approved to be on campus and/or have BruinCast to record his lectures. He also mentioned that students who plan on taking Chem14B this W...
- Wed Nov 25, 2020 9:08 pm
- Forum: Hybridization
- Topic: Sapling Week 7 & 8 HW Question 11
- Replies: 14
- Views: 913
Re: Sapling Week 7 & 8 HW Question 11
Since there are four regions of electron density, three bonds and one lone pair, this means that the hybridization of this molecule is sp^3 (s, p, p, p).
- Wed Nov 25, 2020 9:06 pm
- Forum: General Science Questions
- Topic: Grading Scale Chem 14A
- Replies: 11
- Views: 1218
Re: Grading Scale Chem 14A
I was also confused on the grading scale because I also saw that in the syllabus. Does anyone know what the in between grades are if a C- is 50%? Like what is the percentage gap between a B+ to a B- ?
- Wed Nov 25, 2020 9:02 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: H2O VSEPR
- Replies: 27
- Views: 1533
Re: H2O VSEPR
H20 would have a bent shape since there are 4 electron domains; 2 being lone pairs and the other two being bonds.
- Wed Nov 25, 2020 9:01 pm
- Forum: Student Social/Study Group
- Topic: Finals!
- Replies: 43
- Views: 2499
Re: Finals!
Since the final is cumulative, will the majority of the questions on the final be on the latest topics we've covered rather than content from midterm 1 and 2?
- Sat Nov 21, 2020 3:15 am
- Forum: Dipole Moments
- Topic: Polarity
- Replies: 30
- Views: 1662
Re: Polarity
A molecule can be polar because of the dipoles occurring between each atom, but when all the atoms have the same "pull", electronegativity difference, they can cancel out resulting in the whole molecule to be nonpolar.
- Sat Nov 21, 2020 3:13 am
- Forum: Lewis Acids & Bases
- Topic: Molecules With Polar Double Bonds
- Replies: 5
- Views: 402
Re: Molecules With Polar Double Bonds
I was having a hard time with the Lewis acids and bases too, can someone please explain the difference. it helps to have a visual structure of the molecules/atoms so you can see whether there are any lone pair electrons that can be shared (Lewis base) or if it's deficient in electrons (Lewis Acid)....
- Sat Nov 21, 2020 3:11 am
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Determining Polarity
- Replies: 6
- Views: 542
Re: Determining Polarity
How I think of polarity is that the atom with the more electronegativity is "hogging the electron" which results in a partial negative and partial positive.
- Sat Nov 21, 2020 12:18 am
- Forum: Student Social/Study Group
- Topic: Post Midterm Blues
- Replies: 71
- Views: 4884
Re: Post Midterm Blues
victoria_dao_3L wrote:This class gives a lot of stress considering that we basically only have three exams that determine the majority of our grade, but seriously no worries! We've all got this!
I know right! Midterms for this class are finally over and I'm already worried about the final for this class *crying emoji*
- Sat Nov 21, 2020 12:15 am
- Forum: Student Social/Study Group
- Topic: post midterm 2
- Replies: 27
- Views: 1462
Re: post midterm 2
I feel way better about this midterm but am really anxious for the final!!! Does anyone know when scores will be released?!
- Fri Nov 13, 2020 12:50 am
- Forum: Dipole Moments
- Topic: Boiling point of molecules
- Replies: 5
- Views: 366
Re: Boiling point of molecules
I believe this is because the stronger Intermolecular forces there are between molecules, the higher the boiling/melting point will be.
- Fri Nov 13, 2020 12:48 am
- Forum: Lewis Acids & Bases
- Topic: Molecules With Polar Double Bonds
- Replies: 5
- Views: 402
Re: Molecules With Polar Double Bonds
I was having a hard time with the Lewis acids and bases too, can someone please explain the difference.
- Fri Nov 13, 2020 12:44 am
- Forum: Resonance Structures
- Topic: Resonance Hybrid Structures
- Replies: 6
- Views: 392
Re: Resonance Hybrid Structures
Hi! I don't believe we would have to just because we didn't really go into resonance hybrid structures that much. As for drawing them for the midterm, I feel like we wouldn't have to since it is multiple choice, I could be wrong though.
- Fri Nov 13, 2020 12:40 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: H-F H-F Hydrogen Bonding vs Dipole-Dipole
- Replies: 11
- Views: 1555
Re: H-F H-F Hydrogen Bonding vs Dipole-Dipole
I believe since this is a dipole dipole force then it would also be a Hydrogen bond.
- Fri Nov 13, 2020 12:39 am
- Forum: Electronegativity
- Topic: Confusion between electronegativity and electron affinity
- Replies: 15
- Views: 859
Re: Confusion between electronegativity and electron affinity
Electronegativity and electron affinity have the same trend on the periodic table (increasing up and to the right), but they are different because electronegativity is the ability of an atom to hold onto their electrons tightly and electron affinity is how many electrons atoms want to gain.
- Fri Nov 13, 2020 12:34 am
- Forum: Formal Charge and Oxidation Numbers
- Topic: Oxidation Number
- Replies: 4
- Views: 414
Re: Oxidation Number
I had the same question! I'm still kind of confused, but does anyone know how to calculate the oxidation number?
- Mon Nov 02, 2020 2:30 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration
- Replies: 8
- Views: 426
Re: Electron Configuration
Andy Hernandez wrote:Why is 4s filled first?
4s is filled first only if the 3d orbitals are not being occupied.
- Mon Nov 02, 2020 2:22 am
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm grades
- Replies: 19
- Views: 982
Re: Midterm grades
905579227 wrote:Wait so we wont know until end of week five!? lowkey nervous. Does anyone know how it is actually graded because i have heard alot of mixed results.
I hope the midterm grade comes out soon, I'm also nervous!
- Mon Nov 02, 2020 2:19 am
- Forum: Student Social/Study Group
- Topic: How to relax
- Replies: 168
- Views: 41982
Re: How to relax
I enjoy going on drives while vibing to music and also just watching my show on Hulu :)
- Mon Nov 02, 2020 2:17 am
- Forum: Student Social/Study Group
- Topic: Halloween!!!
- Replies: 73
- Views: 4747
Re: Halloween!!!
Mahnoor_Wani_2F wrote:I did chemistry and LS30A homework for halloween
Me too lol!
- Mon Nov 02, 2020 2:16 am
- Forum: Empirical & Molecular Formulas
- Topic: Review for Midterm
- Replies: 11
- Views: 835
Re: Review for Midterm
Samin Kabir wrote:When do we get the midterms back?
I was also wondering the same thing...
- Wed Oct 28, 2020 11:37 am
- Forum: Quantum Numbers and The H-Atom
- Topic: Spin state
- Replies: 25
- Views: 1423
Re: Spin state
Funmi Baruwa wrote:What exactly does the spin state of an electron tell us about an electron?
I have the same question. ^
- Wed Oct 28, 2020 11:36 am
- Forum: General Science Questions
- Topic: Midterm Grades
- Replies: 30
- Views: 1570
Re: Midterm Grades
When will our final grades from the midterm be posted? Also, I heard someone say Lavelle may be offering partial credit? How would that be the case because they are multiple choice? My TA said probably after this Friday our midterm grades will be up. As for the partial credit, I feel like since som...
- Wed Oct 28, 2020 11:31 am
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Format
- Replies: 12
- Views: 698
Re: Midterm Format
Jacquelyn Challis 1H wrote:Does anyone know how many questions will be on the midterm and/or how much time we'll have to complete?
There are 12 questions and you will have 56 minutes.
- Wed Oct 28, 2020 11:30 am
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Format
- Replies: 12
- Views: 698
Re: Midterm Format
You are able to go back and review questions. Goodluck on all your midterms!
- Wed Oct 28, 2020 11:27 am
- Forum: Administrative Questions and Class Announcements
- Topic: Participation Points [ENDORSED]
- Replies: 62
- Views: 4858
Re: Participation Points [ENDORSED]
I also keep clicking on my name to view my points but it is not showing. Where do we click again to view our points?