Search found 134 matches
- Mon Mar 08, 2021 11:36 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Access to accounts
- Replies: 10
- Views: 734
Re: Access to accounts
i think we can still see all the posts and threads, but i'm not sure if we are still allowed/able to post. hope this helps!
- Mon Mar 08, 2021 11:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final on 3/13
- Replies: 18
- Views: 934
Re: Final on 3/13
the final starts at 9:30 am. hope this helps!
- Mon Mar 08, 2021 11:28 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 9
- Views: 554
Re: Final
the final is cumulative. hope this helps!
- Mon Mar 08, 2021 11:28 pm
- Forum: Administrative Questions and Class Announcements
- Topic: The Final
- Replies: 17
- Views: 893
Re: The Final
i would assume this would be the case. hope this helps!
- Mon Mar 08, 2021 11:26 pm
- Forum: Administrative Questions and Class Announcements
- Topic: week 10 lectures?
- Replies: 15
- Views: 945
Re: week 10 lectures?
i think we will be ending new material on wednesday and having a review lecture on friday. hope this helps!
- Sun Mar 07, 2021 10:27 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 9 Sapling
- Replies: 11
- Views: 657
Re: Week 9 Sapling
yup, it's combined with week 10 and will be due the friday of week 10 (3/12). hope this helps!
- Sun Mar 07, 2021 10:26 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam Time
- Replies: 47
- Views: 2568
Re: Final Exam Time
the final is from 9:30 am to 11 am! hope this helps!
- Sun Mar 07, 2021 10:24 pm
- Forum: Administrative Questions and Class Announcements
- Topic: 14B final date and time?
- Replies: 9
- Views: 586
Re: 14B final date and time?
it's on sunday, march 14th at 9:30 am! hope this helps!
- Sun Mar 07, 2021 10:23 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 2 grade
- Replies: 7
- Views: 452
Re: Midterm 2 grade
i see my grade on ccle! hope this helps!
- Sun Mar 07, 2021 10:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: lectures
- Replies: 22
- Views: 1146
Re: lectures
Hi Monica! I think we should be finished with new material by Wednesday. Hope this helps!
- Wed Feb 24, 2021 9:15 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Summer Session Chem 14BL
- Replies: 2
- Views: 249
Summer Session Chem 14BL
Hi! I know this is question is geared towards 14BL rather than B, but does anyone know the likelihood of getting off the waitlist for Chem 14BL during Summer Session A? or if they will be adding more spots to the class to accommodate the waitlist? Thanks for the help!
- Wed Feb 24, 2021 9:13 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem 14 B Final
- Replies: 34
- Views: 1670
Re: Chem 14 B Final
it is cumulative! but i am assuming that the number of questions regarding each section will vary depending on how much time we spent on that section. hope this helps!
- Wed Feb 24, 2021 9:12 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem community points
- Replies: 15
- Views: 716
Re: Chem community points
i think it depends on your TA, so to be safe maybe continue the 5 posts a week. hope this helps!
- Wed Feb 24, 2021 9:11 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chemistry Enrollment
- Replies: 5
- Views: 388
Re: Chemistry Enrollment
i believe those in over-enrollment have priority over waitlist. I am currently waitlisted for a class and this is what MyUCLA told me regarding positions on the waitlist: "For example, if a class has an enrollment capacity of 30 and there are 35 enrolled and there are 5 on the waitlist, your ef...
- Mon Feb 22, 2021 9:13 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 48
- Views: 2971
Re: Final
i would review textbook problems and make sure you really understand why certain steps are taken in solving. also youtube videos are really helpful for review!
- Mon Feb 15, 2021 11:10 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Extra homework problems on Midterm 2
- Replies: 14
- Views: 806
Re: Extra homework problems on Midterm 2
check outline 3 and 4 on Lavelle's website! they have a bunch of specific textbook problems that he picked out. hope this helps!
- Mon Feb 15, 2021 11:09 pm
- Forum: Administrative Questions and Class Announcements
- Topic: cc update
- Replies: 23
- Views: 1270
Re: cc update
I would just wait it out to see updates, but make sure you're still posting consistently!
- Mon Feb 15, 2021 11:07 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 2 Coverage
- Replies: 6
- Views: 405
Re: Midterm 2 Coverage
Midterm 2 covers until week 6, so it partially covers outline 3 and the entirety of outline 4. hope this helps!
- Mon Feb 15, 2021 11:05 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MT2 Outline 3 Content
- Replies: 3
- Views: 294
MT2 Outline 3 Content
Hi! What bullet point on Outline 3 starts what we need to know for MT2? Thanks for the help!
- Mon Feb 15, 2021 11:04 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 2
- Replies: 14
- Views: 671
Re: Midterm 2
He said that "8 point questions and 4 point questions, 8 point questions have 4 point partial credit answers" Hope this helps!
- Thu Feb 11, 2021 12:20 am
- Forum: Administrative Questions and Class Announcements
- Topic: CC points, where to find?
- Replies: 12
- Views: 714
Re: CC points, where to find?
it's under grades on CCLE. hope this helps!
- Thu Feb 11, 2021 12:19 am
- Forum: Administrative Questions and Class Announcements
- Topic: Can We Review our Exams?
- Replies: 69
- Views: 3529
Re: Can We Review our Exams?
I would ask your TA during their OH to review with you as that's how it was for 14a. hope this helps!
- Thu Feb 11, 2021 12:18 am
- Forum: Administrative Questions and Class Announcements
- Topic: MyUCLA Grade
- Replies: 27
- Views: 1547
Re: MyUCLA Grade
they're all updated on CCLE! hope this helps!
- Thu Feb 11, 2021 12:17 am
- Forum: Administrative Questions and Class Announcements
- Topic: midterm 2
- Replies: 12
- Views: 689
Re: midterm 2
i'm assuming it'll just be stuff after midterm one like it was for 14a. hope this helps!
- Thu Feb 11, 2021 12:16 am
- Forum: Administrative Questions and Class Announcements
- Topic: tips if you're struggling!
- Replies: 77
- Views: 5221
Re: tips if you're struggling!
thanks for all the tips y'all! definitely will be using them :) good luck!
- Mon Feb 08, 2021 7:28 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Positive and Negative q Value
- Replies: 19
- Views: 13457
Re: Positive and Negative q Value
Hi! q is negative when the reaction is exothermic (releasing heat) and positive when the reaction is endothermic (heat is added). hope this helps!
- Thu Feb 04, 2021 9:38 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Work
- Replies: 39
- Views: 1583
Re: Work
Work is negative when a system does work on its surroundings. A larger negative number means more work was done. Hope this helps!
- Thu Feb 04, 2021 9:37 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: closed system
- Replies: 43
- Views: 1642
Re: closed system
Closed systems don't allow for the exchange of matter. hope this helps!
- Thu Feb 04, 2021 9:36 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: W
- Replies: 14
- Views: 590
Re: W
Hi! N is the number of molecules in the system. Hope this helps!
- Thu Feb 04, 2021 9:35 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Work Definition
- Replies: 33
- Views: 1185
Re: Work Definition
Hi! From what I understand, Work is the energy transferred between a system and its surroundings. Hope this helps!
- Wed Feb 03, 2021 12:42 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: R Constant
- Replies: 91
- Views: 6781
Re: R Constant
I would use the R constant that matches the units given in the problem. Hope this helps!
- Mon Feb 01, 2021 9:03 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Definition of Open, Closed, and Isolated Systems
- Replies: 5
- Views: 1471
Definition of Open, Closed, and Isolated Systems
Hi! Can anyone explain the definition/differences of open, closed, and isolated systems? Thanks so much for the help!
- Sun Jan 31, 2021 7:34 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chemistry Community Quota
- Replies: 16
- Views: 1136
Re: Chemistry Community Quota
since you’re from a different class last quarter, you only have to do the 50 for this quarter. hope this helps!
- Sun Jan 31, 2021 7:32 pm
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL EXAM QUESTIONS
- Replies: 40
- Views: 2793
Re: FINAL EXAM QUESTIONS
i believe some will come from the textbook but not all. hope this helps!
- Sun Jan 31, 2021 7:31 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sapling Reset?
- Replies: 17
- Views: 1521
Re: Sapling Reset?
i do not believe there is a reset button, but you can look at your previous attempts. hope this helps!
- Sun Jan 31, 2021 7:30 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grading scale
- Replies: 29
- Views: 3351
Re: Grading scale
i think an A is 93-96% while A- is 90-92%
- Sun Jan 31, 2021 7:28 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grading for Chemistry Community Posts
- Replies: 13
- Views: 1107
Re: Grading for Chemistry Community Posts
only the amount of posts!
- Wed Jan 27, 2021 11:13 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Lecture Content for MT1
- Replies: 4
- Views: 231
Lecture Content for MT1
Hi! Up to which lecture number is going to be on midterm 1? Thanks for the help!
- Wed Jan 27, 2021 12:40 am
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 1 Zoom Proctoring
- Replies: 14
- Views: 756
Re: Midterm 1 Zoom Proctoring
Yes, I think it is the same procedure as 14a. Hope this helps!
- Wed Jan 27, 2021 12:38 am
- Forum: Administrative Questions and Class Announcements
- Topic: Partial Credit on MT 1
- Replies: 15
- Views: 822
Re: Partial Credit on MT 1
I think the closer you are to the correct answer, the more partial credit you will receive. Hope this helps!
- Wed Jan 27, 2021 12:35 am
- Forum: Phase Changes & Related Calculations
- Topic: when to assume x is insignificant
- Replies: 86
- Views: 7808
Re: when to assume x is insignificant
Dr. Lavelle said x is assumed insignificant when it is less than 10^-4. Hope this helps!
- Wed Jan 27, 2021 12:32 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Correct units for Standard Reaction Enthalpy
- Replies: 7
- Views: 276
Re: Correct units for Standard Reaction Enthalpy
I think it is kj/mol. Hope this helps!
- Tue Jan 26, 2021 5:12 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Memorize bond enthalpies / standard enthalpies of formation?
- Replies: 39
- Views: 1416
Re: Memorize bond enthalpies / standard enthalpies of formation?
As everyone already said, I don't think we'll have to memorize them considering Dr. Lavelle looked them up during lecture, so I am assuming they will be given during the exam. Also, this link from the Chempendix was given while I was working on Sapling homework: https://sites.google.com/site/chempen...
- Tue Jan 26, 2021 5:08 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Sapling #5 Reverse Equation
- Replies: 2
- Views: 164
Sapling #5 Reverse Equation
Hi! For #5 on Sapling, I was confused on why we flip equation 4? Is it simply because the MCL3(s) is needed on the product side rather than MCl3(aq) in the final reaction? I hope this make sense, thanks for the help!
- Tue Jan 19, 2021 3:01 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem Community and Sapling Grades
- Replies: 25
- Views: 1271
Re: Chem Community and Sapling Grades
They are on CCLE and MyUCLA, however, I think chemistry community grades are updated just at the end of the week unlike Sapling, which tracks your progress as you do it. Hope this helps!
- Tue Jan 19, 2021 3:00 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Lavelle's Class Website
- Replies: 11
- Views: 386
Re: Lavelle's Class Website
Maybe the way you input the password was wrong? LL14B21 is the password for his site, hope this helps and you are able to get in!
- Tue Jan 19, 2021 2:58 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Seeing replies on Chemistry Community
- Replies: 10
- Views: 577
Re: Seeing replies on Chemistry Community
You can click quick links on the upper left corner and check "your posts" to see if people have replied to your questions. Also, under the submit button for a question/response, there is a box for options where you can click "notify me when a reply is posted." Hope this helps!
- Tue Jan 19, 2021 2:55 pm
- Forum: Ideal Gases
- Topic: R Value
- Replies: 17
- Views: 741
Re: R Value
The different gas constants are given on the constants and equations sheet that we are allowed to use for tests, and I would decide from there which constant to use by looking for the relevant units. Hope this helps!
- Tue Jan 19, 2021 2:53 pm
- Forum: Ideal Gases
- Topic: Omitting solid/liquid
- Replies: 19
- Views: 789
Re: Omitting solid/liquid
Hi! the concentrations of solids and liquids do not change, therefore we omit them. Hope this helps!
- Tue Jan 19, 2021 2:52 pm
- Forum: Ideal Gases
- Topic: Gas Constant Value
- Replies: 43
- Views: 1751
Re: Gas Constant Value
Hi! the gas constants are on the constants and equations sheet found on Lavelle's website, and we can use that sheet during tests. therefore, you don't necessarily have to memorize all of them if they are on the sheet, but I guess use the one that has the correct units for the problem. Hope this hel...
- Wed Jan 13, 2021 11:28 pm
- Forum: Ideal Gases
- Topic: Non-Ideal gases?
- Replies: 26
- Views: 1017
Re: Non-Ideal gases?
I don't think they will be covered in this class, but maybe in other future classes or series. Hope this helps!
- Wed Jan 13, 2021 11:27 pm
- Forum: Ideal Gases
- Topic: Does temperature matter?
- Replies: 19
- Views: 606
Re: Does temperature matter?
Temperature is important, but I think it'll matter more as we move onto more complicated questions. If a temperature is not stated, my TA said to assume it is at room temp which is 25 degrees C. Hope this helps!
- Wed Jan 13, 2021 11:23 pm
- Forum: Ideal Gases
- Topic: Inert Gas
- Replies: 20
- Views: 688
Re: Inert Gas
Inert gases are non-reactive gases, such as noble gases. Hope this helps!
- Wed Jan 13, 2021 11:22 pm
- Forum: Ideal Gases
- Topic: reversing reactions
- Replies: 83
- Views: 5577
Re: reversing reactions
When K is reversed, it becomes the inverse of the forward reaction, therefore 1/K. Hope this helps!
- Wed Jan 13, 2021 11:21 pm
- Forum: Ideal Gases
- Topic: Kc vs Kp
- Replies: 109
- Views: 5071
Re: Kc vs Kp
Kc is used for concentrations while Kp is used for partial pressures. Hope this helps!
- Mon Jan 11, 2021 11:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Question about 14B Exams
- Replies: 38
- Views: 1514
Re: Question about 14B Exams
yes! we will take our midterms during our lecture time that we picked when signing up for classes. hope this helps!
- Mon Jan 11, 2021 11:27 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Participation
- Replies: 18
- Views: 953
Re: Participation
we get points for both posting and responding! hope this helps :)
- Mon Jan 11, 2021 11:20 pm
- Forum: Ideal Gases
- Topic: Temperature in Ideal Gas Law
- Replies: 14
- Views: 437
Re: Temperature in Ideal Gas Law
we use kelvin when plugging in for the ideal gas law! hope this helps :)
- Wed Jan 06, 2021 12:34 am
- Forum: Administrative Questions and Class Announcements
- Topic: Lecture Format
- Replies: 22
- Views: 907
Re: Lecture Format
all lectures are asynchronous, and discussions are live (so they are unfortunately are not recorded) but not mandatory. they are pretty helpful though in going over practice problems from the homework! hope this helps!
- Wed Jan 06, 2021 12:28 am
- Forum: Administrative Questions and Class Announcements
- Topic: Question about sapling homework
- Replies: 5
- Views: 333
Re: Question about sapling homework
nope! you are not penalized for incorrect answers, and we have unlimited tries to get the right one. hope this helps!
- Wed Jan 06, 2021 12:27 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Forward vs Reverse Reactions
- Replies: 3
- Views: 183
Forward vs Reverse Reactions
Hi! How do we know whether to use the forward or reverse reaction and K-forward or K-reverse? I'm not sure if this question is too vague/confusing, but the best example I can give is this question from Sapling: "At equilibrium, the concentrations in this system were found to be [N2]=[02]=0.300 ...
- Wed Jan 06, 2021 12:07 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE Box
- Replies: 4
- Views: 250
ICE Box
Hi! How do we know whether the change in the C part of the ICE is negative or positive? Like how do we know whether the x (or 2x etc.) is positive or negative? I thought the general trend would be that the reactants have a negative change while products are positive, but I am not sure if I am correc...
- Mon Jan 04, 2021 9:54 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem Community Username
- Replies: 10
- Views: 350
Re: Chem Community Username
you don't have to change the username itself, just your alias that you use so that it has your updated discussion section! just click "register alias and password" on the top and the only thing you have to change is your alias. hope this helps :)
- Wed Dec 16, 2020 11:42 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chemistry Community posts after this quarter [ENDORSED]
- Replies: 7
- Views: 1048
Re: Chemistry Community posts after this quarter [ENDORSED]
Hi! Our posts stay up as long as chem community stays up! Hope this helps :)
- Fri Dec 11, 2020 10:08 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: pKa and Ka
- Replies: 2
- Views: 209
Re: pKa and Ka
Ka is the measure of the strength of a weak acid. That is, it measures the amount a weak acid will dissociate. The higher your Ka, the stronger your acid and the lower your pH (they're inversely related). pKa is the negative log of Ka just as pH is the negative log of [H3O+]. They too are inversely...
- Fri Dec 11, 2020 9:46 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: pKa and Ka
- Replies: 2
- Views: 209
pKa and Ka
What are pKa and Ka, as in the actual definition of them? Also, how would we calculate them?
- Thu Dec 10, 2020 11:24 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Partial Credit?
- Replies: 3
- Views: 201
Re: Final Partial Credit?
Chem_Mod wrote:Only 12 pt questions in MT 1 had partial credit.
8 pt questions in MT 1 did not.
7 pt questions in MT 2 did not.
The final has only 6pt questions.
All the best with finals.
Thank you so much!
- Thu Dec 10, 2020 11:22 pm
- Forum: Lewis Acids & Bases
- Topic: lewis vs bronsted
- Replies: 10
- Views: 460
Re: lewis vs bronsted
Hi! Lewis acids/bases and Bronsted acids/bases are basically saying the same thing but just have two different focuses. Bronsted acids/bases focus on protons, where the acids donate protons and the bases accept protons. Lewis acids/bases however focus on electrons, where the acids accept electrons a...
- Wed Dec 09, 2020 9:59 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Bruin Cast Lectures
- Replies: 5
- Views: 331
Re: Bruin Cast Lectures
Hi! This happened to me with the Week 10 Monday lecture, but I was able to instead watch the video 2 option and it worked. Hope this helps!
- Wed Dec 09, 2020 9:57 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Partial Credit?
- Replies: 3
- Views: 201
Final Partial Credit?
Hi, does anyone know if we will be receiving partial credit for questions for the final like we did for midterm 1? I remember this being brought up to various TAs for the past couple weeks, but I do not remember if they or Dr. Lavelle ever confirmed nor denied it. Thanks for the help!
- Wed Dec 09, 2020 9:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: last day of lecture
- Replies: 12
- Views: 678
Re: last day of lecture
wednesday is the last lecture for new content but the friday lecture will be all review. hope this helps!
- Wed Dec 09, 2020 9:48 pm
- Forum: Conjugate Acids & Bases
- Topic: Alkaline
- Replies: 16
- Views: 806
Re: Alkaline
Yes! If a solution is alkaline, it means it is basic and therefore a pH higher than 7. Hope this helps!
- Tue Dec 08, 2020 5:32 pm
- Forum: Lewis Acids & Bases
- Topic: Water
- Replies: 63
- Views: 3017
Re: Water
Water can act as both. Hope this helps!
- Mon Dec 07, 2020 11:55 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: Midterm 3C
- Replies: 9
- Views: 847
Re: Midterm 3C
NH4Cl is a salt that can lower the pH by dissociating and donating a proton to H2O. Hope this helps!
- Sun Dec 06, 2020 8:09 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: strong vs weak
- Replies: 10
- Views: 369
Re: strong vs weak
A longer bond means that it is a weaker bond, thus making the acid stronger because the atoms dissociate the protons way easier. So basically, the longer the bond, the stronger the acid. Hope this helps!
- Fri Dec 04, 2020 1:57 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final exam (fall 2020 quarter)
- Replies: 20
- Views: 985
Re: Final exam (fall 2020 quarter)
It's cumulative! So everything we've learned in the course. Hope this helps!
- Fri Dec 04, 2020 1:52 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grade Cutoffs
- Replies: 4
- Views: 324
Grade Cutoffs
Hi! Does anyone know the cutoffs for letter grades in this class? The only one I know is that "50% or higher is required to pass with a C- or higher," as stated in the syllabus, however I do not know which other percentages correspond with the other letter grades. Any help is appreciated, ...
- Thu Dec 03, 2020 6:41 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Weak/strong acids/bases
- Replies: 2
- Views: 144
Weak/strong acids/bases
Hi! What is the difference between weak and strong acids and bases? Thanks!
- Wed Dec 02, 2020 11:43 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted Acids and Bases
- Replies: 7
- Views: 248
Bronsted Acids and Bases
Hi! I'm just a bit confused on exactly what a Bronsted acids and bases are? Any help is appreciated, thanks!
- Tue Dec 01, 2020 11:05 pm
- Forum: Hybridization
- Topic: Sigma and Pi bonds
- Replies: 29
- Views: 2815
Re: Sigma and Pi bonds
Sigma bonds are always single bonds while Pi bonds are always involved in double, triple, or more bonds. In a single bond, you only have a sigma bond. In a double bond, you have one sigma and one pi bond. In a triple bond, you have one sigma bond and two pi bonds. Hope this helps!
- Mon Nov 30, 2020 10:01 pm
- Forum: Naming
- Topic: Using ido or o
- Replies: 24
- Views: 964
Re: Using ido or o
Hi! Dr. Lavelle said that the textbook specifically uses -ido, and we are free to use either that or -o, but he will be using -o in class and for Sapling. Hope this helps!
- Thu Nov 26, 2020 11:25 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pair E-
- Replies: 47
- Views: 2137
Re: Lone Pair E-
Yes, a lone pair counts as a region of electron density. Hope this helps!
- Thu Nov 26, 2020 11:21 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 25
- Views: 1019
Re: Bond Angles
I'm pretty sure we will have to memorize the shapes as well as the bond angles. Hope this helps!
- Thu Nov 26, 2020 11:20 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Shape Names
- Replies: 50
- Views: 2590
Re: Shape Names
You can use bent or angular for the name. Hope this helps!
- Thu Nov 26, 2020 11:19 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Chart
- Replies: 18
- Views: 1017
Re: VSEPR Chart
I'm pretty sure we'll have to memorize the shapes and bond angles. Hope this helps!
- Tue Nov 24, 2020 7:04 pm
- Forum: Dipole Moments
- Topic: Polarity
- Replies: 30
- Views: 1496
Re: Polarity
The dipole moments cancel out. Hope this helps!
- Tue Nov 24, 2020 12:34 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sapling #17, Week 7/8
- Replies: 7
- Views: 297
Re: Sapling #17, Week 7/8
The 60 degree angle bond comes from the triangle that the 3 carbons make. Hope this helps!
- Fri Nov 20, 2020 1:06 am
- Forum: Bond Lengths & Energies
- Topic: Boiling/Melting Point
- Replies: 29
- Views: 1330
Re: Boiling/Melting Point
We would look at intermolecular forces in order to understand what is occuring between molecules. Hope this helps!
- Fri Nov 20, 2020 1:04 am
- Forum: Dipole Moments
- Topic: Midterm 2 Results
- Replies: 7
- Views: 446
Re: Midterm 2 Results
I'm assuming it'll take about the same amount of time as MT1, so hopefully we will get it by next week. Hope this helps!
- Wed Nov 18, 2020 9:25 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Notation
- Replies: 3
- Views: 212
Re: VSEPR Notation
Hi! The central atom is always the least electronegative and in this example it is carbon. Since Carbon in CH3CL is bonded to each atom, the molecule consequently has 4 bonding regions with no extra electrons/lone pairs. Therefore, its VSEPR notation must be AX4 since the structure describes a cent...
- Wed Nov 18, 2020 8:53 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Notation
- Replies: 3
- Views: 212
VSEPR Notation
Hi! Today in lecture, Dr. Lavelle said that VSEPR notation uses the letters A, X, and E meaning the central atom, bonded atom, and lone pair respectively. He said that both CH4 and CH3CL are AX4. I understand why CH4 is equal to AX4, but I'm confused as to how CH3CL is equal to AX4. I get that AX4 i...
- Wed Nov 18, 2020 2:02 am
- Forum: Dipole Moments
- Topic: Dipole representation on midterm 2
- Replies: 9
- Views: 469
Re: Dipole representation on midterm 2
I remember Dr. Lavelle only using the first diagram during the lecture so maybe that one? I could be wrong though. Hope this helps!
- Mon Nov 16, 2020 11:18 pm
- Forum: Octet Exceptions
- Topic: Exceptions/Expanded Octet
- Replies: 1
- Views: 125
Exceptions/Expanded Octet
Hi! Couple of questions: An expanded octet is an exception to the octet rule right? Is there a way for us to tell if an element has an expanded octet, or is that just something we kind of have to just memorize which atoms have it and which atoms do not? Also, does anyone have a list of elements that...
- Sun Nov 15, 2020 8:36 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Probability?
- Replies: 1
- Views: 88
Probability?
Hi! It says in the week 2 outline that we need to be able to " Describe the interpretation of atomic orbitals in terms of probability." Did Dr. Lavelle ever go over this in lecture? I feel like I don't remember probability being talked about at all this course. Thanks for the help!
- Sat Nov 14, 2020 9:04 pm
- Forum: Dipole Moments
- Topic: Dipole-Induced Dipole
- Replies: 2
- Views: 179
Dipole-Induced Dipole
Hi! Couple questions: What exactly are induced dipoles? Are dipole-induced dipole interactions the same as dispersion/London forces/Van der Waals, or does it have to be induced dipole-induced dipole to be considered the same as dispersion/London/Van der Waals? Thanks for the help!
- Fri Nov 13, 2020 2:58 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lecture Content for 11/13
- Replies: 3
- Views: 201
Lecture Content for 11/13
Hi! Is what was covered today (11/13) in lecture going to be included on MT2? Thanks for the help!
- Fri Nov 13, 2020 12:23 am
- Forum: Resonance Structures
- Topic: Resonance Hybrid Structures
- Replies: 6
- Views: 364
Resonance Hybrid Structures
Hi! Will we be asked to draw the resonance hybrid structures for this midterm, or this class in general? Thanks for the help!
- Thu Nov 12, 2020 10:19 pm
- Forum: Student Social/Study Group
- Topic: Midterm 2
- Replies: 31
- Views: 1405
Re: Midterm 2
Yes! The last 8 bullet points of outline 2 as well as all of outline 3.
- Thu Nov 12, 2020 10:15 pm
- Forum: Electronegativity
- Topic: Confusion between electronegativity and electron affinity
- Replies: 15
- Views: 821
Re: Confusion between electronegativity and electron affinity
Electronegativity and and electron affinity follow the same periodic trend where they increase as it goes up and across the periodic table. Electronegativity is the atom's ability to attract electrons while electron affinity is a neutral atom's likelihood of gaining an electron.
- Thu Nov 12, 2020 12:16 am
- Forum: Student Social/Study Group
- Topic: Conceptual Questions Resource?
- Replies: 8
- Views: 407
Conceptual Questions Resource?
Hi! Does anyone have like a good resource for conceptual questions for this class? I just wanted to know because I know our first midterm had conceptual questions that confused me for a little bit, and since our second midterm is going to mainly be conceptual (I'm assuming?? since there are less cal...