Search found 103 matches
- Sat Mar 13, 2021 10:16 pm
- Forum: *Electrophiles
- Topic: Sapling Week 7/8: Question 7
- Replies: 4
- Views: 1373
Re: Sapling Week 7/8: Question 7
And remember that the oxidation reaction is in the anode and the reduction is the cathode.
- Sat Mar 13, 2021 10:12 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Sapling Question week 9/10
- Replies: 5
- Views: 1709
Re: Sapling Question week 9/10
I will try and give an analogy that helps me visualize this. Think about a very wealthy community. Imagine giving each individual $2000. Now think about a much poorer community. Imagine giving each individual $2000. The money will have a much greater impact on the poorer community than the wealthier...
- Sat Mar 13, 2021 10:03 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Changing k
- Replies: 3
- Views: 303
Re: Changing k
That about covers it!
- Sat Mar 13, 2021 10:00 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Determining slow step
- Replies: 5
- Views: 484
Determining slow step
How do you guys go a out determining the speed when given various mechanisms.
- Sat Mar 13, 2021 9:58 pm
- Forum: Student Social/Study Group
- Topic: Sapling good to review for final?
- Replies: 16
- Views: 972
Re: Sapling good to review for final?
Due to the fact that I don't recall Lavelle putting any Spaling questions on past exams and that he put a good amount from the textbook, I would prioritize that.
- Sat Mar 13, 2021 9:54 pm
- Forum: General Science Questions
- Topic: Pn ∝ e(-En/kBT)
- Replies: 3
- Views: 3004
Re: Pn ∝ e(-En/kBT)
Have you asked a TA about this?
- Sat Mar 13, 2021 9:48 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Sapling HW Week 9/10 #17
- Replies: 9
- Views: 519
Re: Sapling HW Week 9/10 #17
Dear Kyle Walsh,
Do not fret if you had troubles starting this problem, all you have to do is add 48 and 49. Hope you well on the final tmr!
Do not fret if you had troubles starting this problem, all you have to do is add 48 and 49. Hope you well on the final tmr!
- Sat Mar 13, 2021 9:43 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: What was your favorite chem topic?
- Replies: 137
- Views: 11756
Re: What was your favorite chem topic?
Acid and Bases!
- Sat Mar 13, 2021 9:38 pm
- Forum: Student Social/Study Group
- Topic: Spring Quarter
- Replies: 60
- Views: 3591
Re: Spring Quarter
I'm taking chem 14BL in summer and chem 14c in spring!
- Fri Mar 12, 2021 9:58 am
- Forum: Balancing Redox Reactions
- Topic: determing n (moles of e)
- Replies: 12
- Views: 625
determing n (moles of e)
When i intially did this i thought n would equal 5 since that's the charge of the equation, but now i am seeing that is wrong. Now realizing n= 2, anyone have quick tricks to figuring out n.
- Fri Mar 12, 2021 9:53 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Integrated rate laws
- Replies: 4
- Views: 278
Re: Integrated rate laws
Example: First order reaction
rate law: rate = k [A]
integrated rate law : ln[A] = -kt+ ln[A]
rate law: rate = k [A]
integrated rate law : ln[A] = -kt+ ln[A]
- Fri Mar 12, 2021 9:47 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Sapling Week 9/10 #16
- Replies: 13
- Views: 709
Re: Sapling Week 9/10 #16
I will try and give an analogy that helps me visualize this. Think about a very wealthy community. Imagine giving each individual $2000. Now think about a much poorer community. Imagine giving each individual $2000. The money will have a much greater impact on the poorer community than the wealthie...
- Fri Mar 12, 2021 9:45 am
- Forum: Administrative Questions and Class Announcements
- Topic: Solutions Manual
- Replies: 4
- Views: 391
Re: Solutions Manual
I tried circling it, sorry if its hard to see but on the home page of sapling, where you access textbook. hope this helps.
- Fri Mar 12, 2021 9:42 am
- Forum: Student Social/Study Group
- Topic: Planning on dorming in the Fall?
- Replies: 61
- Views: 3728
Re: Planning on dorming in the Fall?
I'm living in an apartment right now and totally love it, but i think i would be nice to be on campus next year especially if class is going to be in person. I have friends in the dorms right now who absolutely love it too, and nothing beats our meal plan.
- Fri Mar 12, 2021 9:39 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Sapling #17
- Replies: 4
- Views: 335
Re: Sapling #17
Heres mine too. same concept but i was given an exothermic reaction.
- Fri Mar 12, 2021 9:32 am
- Forum: Student Social/Study Group
- Topic: It is possible to study for the final in one day?
- Replies: 44
- Views: 4315
Re: It is possible to study for the final in one day?
I would either spend all day Saturday doing textbook problems or weeks 1-10 of matt, kate, or michaels worksheet from their review sessions or both. The UAs pull the questions on their worksheets from past midterms/finals (although they did not have a 14B final due to covid). But keep in mind Lavell...
- Fri Mar 12, 2021 9:30 am
- Forum: General Rate Laws
- Topic: Sapling #5
- Replies: 8
- Views: 464
Re: Sapling #5
Yes you do not need values it more just conceptual. If a species is first order, what happens to the concentration of that also happens to the rate. If a species is second order, what happens to the concentration of that is squared to the rate. So as stated above is B is tripled (3^2)=9, the rate mu...
- Fri Mar 12, 2021 9:27 am
- Forum: General Rate Laws
- Topic: Sapling 9/10 #7
- Replies: 6
- Views: 364
Re: Sapling 9/10 #7
Same thing is happening to me too. Someone on my chem community post about it said to add decimal values after (bc i just left it as 2 x 10^-6) so that might work for you too, didn't really work for me though.
- Wed Mar 10, 2021 9:38 pm
- Forum: Calculating Work of Expansion
- Topic: Michael Nguyen
- Replies: 1
- Views: 304
Michael Nguyen
Does anyone regularly attend Michael's UA review sessions? I'm working through all of his worksheets and cannot figure a question on his thermodynamic worksheet (week 6) out and his answer key doesn't have work. If anybody could help me out that would be amazing.
- Wed Mar 10, 2021 2:17 pm
- Forum: *Enzyme Kinetics
- Topic: catalyst vs intermediate
- Replies: 13
- Views: 1002
Re: catalyst vs intermediate
So for example
A + B --> C + D
C + D + E--> B +F
Overall: A + E--> F
Intermediates: C, D
Catalysts: B
A + B --> C + D
C + D + E--> B +F
Overall: A + E--> F
Intermediates: C, D
Catalysts: B
- Wed Mar 10, 2021 2:16 pm
- Forum: *Enzyme Kinetics
- Topic: catalyst vs intermediate
- Replies: 13
- Views: 1002
Re: catalyst vs intermediate
Another easy way to tell I learned in highschool is that catalysts are on the reactant side of Step 1 and intermediates are on the product side.
- Wed Mar 10, 2021 2:11 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Reaction type
- Replies: 2
- Views: 157
Reaction type
How can you tell if a reaction is exothermic or endothermic without a reaction profile?
- Wed Mar 10, 2021 1:51 pm
- Forum: Student Social/Study Group
- Topic: chem community points
- Replies: 23
- Views: 1174
Re: chem community points
in 14A we had a grace period after the final i think to get more posts in but Lavelle confirmed sunday of week 10.
- Wed Mar 10, 2021 1:48 pm
- Forum: First Order Reactions
- Topic: Sapling Week 9/10 #11, Part 2 [ENDORSED]
- Replies: 3
- Views: 306
Re: Sapling Week 9/10 #11, Part 2 [ENDORSED]
I got the same thing as Sid, the exponentials do get tricky and annoying to juggle but just double check u have enough parentheses.
- Wed Mar 10, 2021 1:44 pm
- Forum: General Rate Laws
- Topic: Final Exam
- Replies: 19
- Views: 823
Re: Final Exam
Yeah the tests is cumulative from this quarter so i will sadly be redoing every textbook problem from all the outlines
- Wed Mar 10, 2021 1:43 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Reaction Profile
- Replies: 6
- Views: 328
Re: Reaction Profile
Yes, these are important to also show how steep the activation energy is.
- Wed Mar 10, 2021 1:37 pm
- Forum: Student Social/Study Group
- Topic: Exam Review
- Replies: 10
- Views: 612
Re: Exam Review
You can go to any TA, they all have access to our midterms.
- Tue Mar 09, 2021 6:07 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem Community Cut Off [ENDORSED]
- Replies: 1
- Views: 570
Chem Community Cut Off [ENDORSED]
Has it been announced when Chem community posts are due?
- Tue Mar 09, 2021 5:19 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Sapling #7
- Replies: 4
- Views: 324
Sapling #7
To solve this i just plugged in for rate=k[A][B]^2 and used the k i found above and the initial values given in the question and i seem to still be getting the wrong answer...is the something i'm missing? Also I dont know if its the same for everyone but my [C] was a zero order
- Fri Feb 26, 2021 3:14 pm
- Forum: Balancing Redox Reactions
- Topic: Sapling Week 7/8 #8
- Replies: 2
- Views: 206
Re: Sapling Week 7/8 #8
Just make sure
1. You are choosing the right species that are being oxidized/reduced
2. The molecules are balanced
3. Add electrons
4. Add charges onto species (if any)
1. You are choosing the right species that are being oxidized/reduced
2. The molecules are balanced
3. Add electrons
4. Add charges onto species (if any)
- Fri Feb 26, 2021 3:11 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Undergoing oxidation/reduction
- Replies: 9
- Views: 535
Re: Undergoing oxidation/reduction
^^ This concept is really important to understand because in Kate's review session she said that on her tests she had to order the strength of reducing/oxidizing power.
- Fri Feb 26, 2021 3:04 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing Redox/Oxd Equations
- Replies: 3
- Views: 219
Balancing Redox/Oxd Equations
Where can I find Lavelle's guide to balancing reactions?
- Fri Feb 26, 2021 3:01 pm
- Forum: Balancing Redox Reactions
- Topic: Sapling Learning Week 7 and 8 Homework Question 3
- Replies: 2
- Views: 161
Re: Sapling Learning Week 7 and 8 Homework Question 3
Do the NO have different charges or different amounts of O molecules?
- Fri Feb 26, 2021 2:57 pm
- Forum: Balancing Redox Reactions
- Topic: Sapling #4 Weeks 7/8
- Replies: 7
- Views: 1590
Re: Sapling #4 Weeks 7/8
I know it's not supposed to work, but I actually just balanced this equation as normal which got me the right answer. I think as long as charges and molecules are balanced on each side you're good.
- Fri Feb 26, 2021 2:50 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Writing cell diagrams
- Replies: 5
- Views: 276
Writing cell diagrams
What general tips/rules/tricks do i need to remember when writing cell diagrams
- Fri Feb 26, 2021 2:46 pm
- Forum: Balancing Redox Reactions
- Topic: Sapling Week 7/8 #1
- Replies: 3
- Views: 232
Re: Sapling Week 7/8 #1
Yes, Potassium cannot be reduced because its oxidation number does not change so it is neither gaining nor losing electrons.
- Thu Feb 18, 2021 11:56 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: ideal gas U
- Replies: 5
- Views: 540
ideal gas U
On the equation sheet we use Ideal gas, deltaU = 3/2nRdeltaT when there's constant volume, but when theres constant pressure can we use deltaU= 5/2nRdeltaT? Or can we only use the equation given.
- Thu Feb 18, 2021 11:31 pm
- Forum: Phase Changes & Related Calculations
- Topic: calculating phase change
- Replies: 6
- Views: 523
calculating phase change
Whats the general rule/equation for calculating heat required for a phase change? I think in a UA review session they added ndeltaH to q, is that what you guys are doing to or is there another way?
- Tue Feb 09, 2021 4:16 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: q equation
- Replies: 21
- Views: 3673
q equation
when do you use q=mcAT and when do you use q=ncAT
- Sun Feb 07, 2021 9:13 pm
- Forum: Calculating Work of Expansion
- Topic: Sapling #13
- Replies: 2
- Views: 204
Re: Sapling #13
Yes we are just looking at moles of gas in the problem!
- Fri Jan 29, 2021 10:33 am
- Forum: Student Social/Study Group
- Topic: Spring 2021
- Replies: 106
- Views: 16919
Re: Spring 2021
kind of a side question, is 14BL usually offered in summer as well? If so, is it being offered in sess A or C? Yes it is offered during summer, i think that prof got bad reviews on bruinwalk but i would double check. I think doing it over summer might be the best idea since people have said the wor...
- Fri Jan 29, 2021 10:31 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Textbook problem 6.61
- Replies: 7
- Views: 313
Textbook problem 6.61
Why doesn't water effect the equilibrium? I understand the addition of water doesn't have an effect on gases, but since there is an aqueous species doesn't liquid impact that?
- Thu Jan 28, 2021 10:04 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: textbook problem 6D.19
- Replies: 2
- Views: 149
textbook problem 6D.19
So for this problem you are given 15.5 g CH3NH3Cl and then you have to convert to moles. I understand once you write the balanced equation you disregard Cl because it does not affect pH but do I still calculate it in when converting to moles?
- Wed Jan 27, 2021 6:06 pm
- Forum: Student Social/Study Group
- Topic: Spring 2021
- Replies: 106
- Views: 16919
Spring 2021
Are you guys taking Chem 14BL or waiting for it to possibly be inperson in the Fall next year? And if so, what are you taking next quarter?
- Wed Jan 27, 2021 6:05 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: textbook problem 5.39
- Replies: 1
- Views: 93
textbook problem 5.39
How did you guys calculate Kc? I saw the chart had the K value 0.15 and since you reverse the reaction you have to manipulate it by doing 1/K, but thats wrong...so what did you guys do?
- Wed Jan 27, 2021 6:03 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: textbook problem 5.35
- Replies: 1
- Views: 91
textbook problem 5.35
For part a, how did you guys know the balanced equation is 2A--->B + 2C?
- Mon Jan 18, 2021 12:09 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: finding conc. from Kc
- Replies: 3
- Views: 112
finding conc. from Kc
So this is a problem from UA Matthew Tran's week 1 worksheet. The number in red is the answer and I can't figure out what is wrong with my work. Any sugguestions?
- Mon Jan 18, 2021 10:06 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sapling Week 1 #9
- Replies: 3
- Views: 259
Re: Sapling Week 1 #9
And make sure when you are making your ICE table, you are subtracting X from the product side and adding to the reactant side. This is because when you add to the products the reaction shifts left. Then plug into Kc equation and square roots both sides to find x! Then dont forget to plug x value bac...
- Mon Jan 18, 2021 9:57 am
- Forum: Student Social/Study Group
- Topic: ua matt tran
- Replies: 2
- Views: 294
ua matt tran
Hey guys i was wondering what tab Matthew posts his workshop worksheets under because I want to go back and review them. Thanks!
- Sat Jan 16, 2021 7:22 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE box for partial pressures
- Replies: 10
- Views: 404
Re: ICE box for partial pressures
Hey! It is the same as calculating concentration.
- Sat Jan 16, 2021 7:04 pm
- Forum: Ideal Gases
- Topic: Hw Question #4
- Replies: 5
- Views: 292
Re: Hw Question #4
Once you make the ICE table and get an X value, plug it back into your ICE table equations and add those values together to get P-Total. I hope that helps.
- Sat Jan 16, 2021 6:37 pm
- Forum: Student Social/Study Group
- Topic: Best Workshops
- Replies: 8
- Views: 357
Re: Best Workshops
So far I've only been to Matthew Tran's, Justin Sarquiz's, and Rosa Munoz's, and I love them all! They are all really good at explaining concepts and use past exam questions which i really appreciate.
- Sat Dec 12, 2020 10:30 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Finding Bond Angle
- Replies: 3
- Views: 235
Finding Bond Angle
How are the bond angles in this molecule 107?
- Sat Dec 12, 2020 10:13 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond angles
- Replies: 12
- Views: 876
Re: Bond angles
From the review sessions I went to, one example problem the TAs thought would be important to be able to do is draw a lewis structure, then describe IMF, and describe shape/bond angle. So, I think it we need to understand all aspects for the final. Online charts + book examples are really helpful.
- Sat Dec 12, 2020 10:09 am
- Forum: Bronsted Acids & Bases
- Topic: Bronsted Acids and Bases
- Replies: 7
- Views: 538
Re: Bronsted Acids and Bases
I really like this visualization!
- Sat Dec 12, 2020 10:07 am
- Forum: Administrative Questions and Class Announcements
- Topic: Course Evaluations
- Replies: 9
- Views: 939
Re: Course Evaluations
Is the course evaluation the one we were emailed, or can it be found somewhere else?
- Sat Dec 12, 2020 9:53 am
- Forum: Lewis Structures
- Topic: Exception to Octet rule (Cl)
- Replies: 6
- Views: 410
Re: Exception to Octet rule (Cl)
Yes! All elements below row 3 can expand their octet.
- Sat Dec 12, 2020 9:50 am
- Forum: Naming
- Topic: oxidation number
- Replies: 9
- Views: 571
Re: oxidation number
To find oxidation number you have to look at the overall charge of the compound, charges of the compounds inside of the coordination sphere, and make a formula. For example [Co(CN)5(0H2)]2-, CN has an overall charge of (-1) and (OH2) is neutral so you’d make the equation X+5(-1)+0=-2 And solve for x...
- Sat Dec 12, 2020 9:40 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Textbook Problem 9C.5
- Replies: 5
- Views: 487
Re: Textbook Problem 9C.5
Which two oxygen atoms? Is it the ones with the single bonds?
- Fri Dec 11, 2020 12:52 pm
- Forum: Lewis Acids & Bases
- Topic: Stength of Acid
- Replies: 2
- Views: 284
Stength of Acid
So, in a review session I learned that a compound with a larger surface area contains stronger LDF. Translating that to the last topic we learned, would a compound with larger surface area be a weaker acid since it would be harder to give up electrons?
- Fri Dec 11, 2020 12:36 pm
- Forum: Conjugate Acids & Bases
- Topic: What is the difference between a lewis acid and bases and Bronsted acids and bases?
- Replies: 7
- Views: 560
Re: What is the difference between a lewis acid and bases and Bronsted acids and bases?
Yes, and all Bronsted-Lowry acid/bases are lewis acids and bases, but not all lewis acids/bases are bronsted lowry.
- Thu Dec 10, 2020 2:57 pm
- Forum: Trends in The Periodic Table
- Topic: Finding Charge
- Replies: 4
- Views: 440
Finding Charge
How do you determine charge for the d-block elements?
- Thu Dec 10, 2020 2:56 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: TA Review
- Replies: 3
- Views: 307
Re: TA Review
anikamenon1L wrote:Did he ever respond to you because I still haven't heard back
No he did not
- Wed Dec 09, 2020 9:31 am
- Forum: Identifying Acidic & Basic Salts
- Topic: week 10 Sapling Q7
- Replies: 5
- Views: 437
Re: week 10 Sapling Q7
k2s03 is actually basic too. since the anion is derived from a weak acid, it will pull an H+
- Wed Dec 09, 2020 9:25 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: TA Review
- Replies: 3
- Views: 307
TA Review
Does anyone know where Andrew Salmon ended up posting the recording to his review session?
- Wed Dec 09, 2020 9:08 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Determining Shape
- Replies: 10
- Views: 752
Determining Shape
What is the difference between molecular shape and electron geometry?
- Wed Dec 09, 2020 9:07 am
- Forum: Administrative Questions and Class Announcements
- Topic: Week 10
- Replies: 3
- Views: 126
Week 10
Do we only have a lecture on Monday this week?
- Wed Dec 09, 2020 9:05 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: calculating pH using sig figs
- Replies: 3
- Views: 219
Re: calculating pH using sig figs
I always play it safe and use two places after the decimal point to insure accuracy
- Wed Dec 09, 2020 9:01 am
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL EXAM QUESTIONS
- Replies: 40
- Views: 2799
Re: FINAL EXAM QUESTIONS
I also heard a TA say that textbook problems will be most helpful in preparation for the final!
- Sat Dec 05, 2020 11:38 pm
- Forum: Student Social/Study Group
- Topic: Evaluations
- Replies: 17
- Views: 879
Re: Evaluations
I'm pretty sure the answer is no, but one could hope.
- Sat Dec 05, 2020 11:17 pm
- Forum: Bronsted Acids & Bases
- Topic: Strong acids
- Replies: 7
- Views: 491
Re: Strong acids
And if you are ever asked which acid is stronger than another, remember the elements with a smaller atomic radii is stronger since it has a shorter bond with H, which is requires more energy to break.
- Sat Dec 05, 2020 11:13 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Sapling W9 #3
- Replies: 6
- Views: 367
Sapling W9 #3
How come hexagonal planar is not a possible geometry for a compound with a coordination number of 6?
- Sat Dec 05, 2020 11:08 pm
- Forum: Student Social/Study Group
- Topic: Grading Scale for Chem14A
- Replies: 29
- Views: 1682
Re: Grading Scale for Chem14A
So if all we know is that 50% is a passing grade, do we project that the passing range is larger or that the grade is going to be curved?
- Sat Dec 05, 2020 11:04 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Oxidation Number
- Replies: 4
- Views: 388
Oxidation Number
Does anyone have any quick.easy methods for calculating oxidation number? thanks.
- Fri Dec 04, 2020 12:25 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: HClO vs. HBrO vs. HIO example
- Replies: 3
- Views: 665
Re: HClO vs. HBrO vs. HIO example
While oxygen is more electronegative, it is not taken into account when comparing all 3 compounds because oxygen is present in each one.
- Fri Dec 04, 2020 12:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem 14A Final
- Replies: 21
- Views: 1218
Re: Chem 14A Final
95 minutes of 30 questions from the topics covered throughout the course so far!
- Fri Dec 04, 2020 12:12 pm
- Forum: Hybridization
- Topic: Sigma/pi bonds
- Replies: 6
- Views: 180
Sigma/pi bonds
I know that triple bonds are composed of 1 sigma bond and 2 pi bonds and since during Dr. Lavelle’s lecture, he drew one with the 2 pi bonds as the outer bonds and the sigma bond in the middle does that mean they need to be in that order or does it not matter?
- Tue Dec 01, 2020 12:11 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sapling #20 Week 8
- Replies: 2
- Views: 173
Sapling #20 Week 8
On #20 the compound [AsO4]3- the structure has 3 single bonds, and 1 double bond. Since the double bond is shorter, why is the shape still tetrahedral?
- Mon Nov 30, 2020 5:26 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Weekly discussion points
- Replies: 13
- Views: 766
Weekly discussion points
I noticed the previous weekly discussion point section of our grades changed, does that mean they will always update and we just need 50 by the last week?
- Sun Nov 22, 2020 11:15 pm
- Forum: Lewis Structures
- Topic: Dot stucture
- Replies: 11
- Views: 570
Re: Dot stucture
Yes, after you find the number of valance electrons you add bonds and lone pairs to the compound until each molecule has 8 electrons (except Hydrogen only requires 2). Also important to note, the central atom is the least electronegative one. There other exceptions to the octet rule for more complex...
- Sun Nov 22, 2020 11:09 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 2 Scores
- Replies: 28
- Views: 1518
Re: Midterm 2 Scores
On that same note, i do not remember what happens if you want to know which problems you answered incorrectly and was wondering if anyone knew. thx
- Wed Nov 18, 2020 1:59 pm
- Forum: Resonance Structures
- Topic: Resonance
- Replies: 11
- Views: 724
Re: Resonance
However, there are instances where the resonance structures are equal!
- Wed Nov 18, 2020 1:57 pm
- Forum: Lewis Structures
- Topic: Radicals
- Replies: 1
- Views: 90
Radicals
I thought I had read somewhere on period 3 elements can expand their valence shells, but on the book work for 2C, the central atom accepted more than 8 electrons, and I was wondering if anyone knew why or if there is a different rule for that?
- Sun Nov 15, 2020 8:57 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Sapling W6 #9
- Replies: 2
- Views: 93
Sapling W6 #9
How do you determine the oxidation number of chlorine in the perchlorate ion?
- Sun Nov 15, 2020 2:12 pm
- Forum: Student Social/Study Group
- Topic: Drawing Lewis Structures
- Replies: 4
- Views: 198
Re: Drawing Lewis Structures
We will probably be given a couple of choices of Lewis structures and then asked what is the correct one. Since it's on CCLE, there won't be a drawing feature I'm guessing. Wait is the 2nd midterm also all multiple choice? The second midterm is same format as the first one, but my TA said there's a...
- Sun Nov 15, 2020 2:08 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Sapling Homework #5
- Replies: 2
- Views: 161
Re: Sapling Homework #5
Here you go!
- Thu Nov 05, 2020 3:33 am
- Forum: Electronegativity
- Topic: Periodic Table Trend
- Replies: 40
- Views: 2573
Re: Periodic Table Trend
Increase across a period, decrease down a group
- Wed Nov 04, 2020 8:38 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: lecture 11/2 question
- Replies: 2
- Views: 105
Re: lecture 11/2 question
Hi, he explains in the lecture on 11/4 that P, S, and Cl are exceptions to the octet rule and can accommodate more than 8 electrons!
- Wed Nov 04, 2020 8:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: missing discussion
- Replies: 8
- Views: 308
Re: missing discussion
Definitely email your TA to get the missed material, and if you need more interactive learning stop by either a step up session or workshop. I found them super helpful :)
- Sun Nov 01, 2020 11:30 pm
- Forum: DeBroglie Equation
- Topic: When to use de Broglie and what numbers to use
- Replies: 8
- Views: 495
Re: When to use de Broglie and what numbers to use
They did that instead of using the Rydberg's equation on our formula sheet because they combined 2 equations. Normally you would do
lamda = c/v and then plug into Rydbergs equation, but they combined it and so the 1.0974 x 10^-7 is R constant divided by speed of light.
lamda = c/v and then plug into Rydbergs equation, but they combined it and so the 1.0974 x 10^-7 is R constant divided by speed of light.
- Sun Nov 01, 2020 11:17 pm
- Forum: *Shrodinger Equation
- Topic: Transitioning energy levels
- Replies: 2
- Views: 213
Transitioning energy levels
Hi, I'm still a little but confused on how to tell which numbers you plug into n2 and n1 when you use Rydberg's equation and was wondering if anyone could briefly explain? thanks.
- Sun Nov 01, 2020 11:02 pm
- Forum: Properties of Electrons
- Topic: Sapling #24
- Replies: 7
- Views: 527
Re: Sapling #24
Sinusoidal means that a FULL "sin" wavelength has been completed, so the examples that have half a cycle on the end are not compatible (even though they look uniform).
- Sun Nov 01, 2020 10:58 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Sapling HW #8
- Replies: 4
- Views: 303
Re: Sapling HW #8
Another good thing to keep you eye out for is key words like "observed" so you know right away it is visible light.
- Sun Nov 01, 2020 10:43 pm
- Forum: DeBroglie Equation
- Topic: sapling
- Replies: 4
- Views: 257
Re: sapling
So to help you with finding the electron, you need to start by finding the velocity using De Broglie's equation (v = h/(m*lamda). Once you get the velocity, you plug it into E = 1/2(m)(v^2) and you are left with the energy of the electron! Hope that helps.
- Sun Oct 18, 2020 7:16 pm
- Forum: Properties of Light
- Topic: energy level transfer
- Replies: 7
- Views: 214
energy level transfer
Can someone please explain the relationship "AS n --> infinity, E--> 0"
- Sat Oct 17, 2020 9:44 pm
- Forum: Properties of Light
- Topic: Study Advice
- Replies: 50
- Views: 2425
Study Advice
To those who are attending the step up sessions/workshops, do you recommend them or is doing the optional bookwork problems enough to understand the curriculum?
- Sat Oct 17, 2020 9:36 pm
- Forum: Properties of Light
- Topic: energy level transfer
- Replies: 4
- Views: 192
energy level transfer
I understand that when electrons transfer down level, light is then emitted. So does that mean that while the electrons are "excited" and is at a higher energy level is the atom not visible yet?
- Sat Oct 17, 2020 9:26 pm
- Forum: Photoelectric Effect
- Topic: Sapling clarification
- Replies: 15
- Views: 581
Re: Sapling clarification
Yes, I also just got an email saying he was going to bundle weeks 2, 3 and 4 all into 1 assignment due the Sunday of week 4.
- Sat Oct 17, 2020 9:20 pm
- Forum: Properties of Electrons
- Topic: Wave properties of elecrons
- Replies: 5
- Views: 429
Wave properties of elecrons
Can someone please explain the difference between the second graphs for the constructive and destructive waves? He went over them in Fridays lecture (10-16-20) but i still am not 100% sure.
- Sun Oct 11, 2020 2:49 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Textbook solutions
- Replies: 3
- Views: 164
Re: Textbook solutions
The link to the answers are on the class dashboard on Sapling/ebook, but they are only odd #. However, the do work through the problems and are extremely helpful!