Search found 104 matches
- Wed Mar 09, 2022 7:04 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Log Properties
- Replies: 9
- Views: 510
Re: Log Properties
In this case, when you subtract ln[A]o from both sides of the equation ln[A]=-kt+ln[A]o, you get ln[A]-ln[A]o=-kt. One of the fundamental log properties is that lnx-lny=ln(x/y), so you would get the final equation ln [A]/[A]o = -kt using this property
- Wed Mar 09, 2022 7:01 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalyst vs intermediates
- Replies: 17
- Views: 611
Re: Catalyst vs intermediates
In the solutions for the Achieve assignment it said somewhere that catalysts are consumed and then produced, while intermediates are produced and then consumed
- Wed Mar 09, 2022 6:56 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Material on final
- Replies: 18
- Views: 707
Re: Material on final
I would definitely focus your studying primarily on thermodynamics and kinetics!
- Wed Mar 09, 2022 6:48 pm
- Forum: First Order Reactions
- Topic: half life units
- Replies: 13
- Views: 552
Re: half life units
I generally use seconds in the equation and then convert to whatever units the question is asking for afterward
- Wed Mar 09, 2022 6:45 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Achieve Hw WK 9/10 #3
- Replies: 14
- Views: 571
Re: Achieve Hw WK 9/10 #3
The rate of the reaction should be expressed as a positive value!
- Wed Mar 09, 2022 6:37 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Why isn't there a bigger effect of the presence of a catalyst at HIGHER temperatures?
- Replies: 8
- Views: 530
Re: Why isn't there a bigger effect of the presence of a catalyst at HIGHER temperatures?
Since catalysts are enzymes, they have a specific range where they function most efficiently and denature once they reach a certain higher temperature.
- Wed Mar 09, 2022 6:35 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Achieve w 9 q 4
- Replies: 6
- Views: 317
Re: Achieve w 9 q 4
Just replace the units with the position of the variable and cancel out on both side: Rate = mol/L*s []= mol/L zero: Rate = k[A] 0 mol/L*s = k first: Rate = k[A] 1 mol/L*s = k (mol/L) 1/s or s -1 = k second: Rate = k[A] 2 mol/L*s = k (mol/L)(mol/L) **this one was a little harder to do but if you cr...
- Wed Mar 09, 2022 6:31 pm
- Forum: *Enzyme Kinetics
- Topic: Achieve W9/10 #19
- Replies: 8
- Views: 392
Re: Achieve W9/10 #19
Hello! So a catalyst will decrease the activation energy and increase the rate of the forward reaction. The same applies to the reverse reaction. The overall reaction remains the same with the addition of a catalyst, it is the mechanism (or path taken) that changes. Delta H is a state function, so i...
- Wed Mar 09, 2022 6:27 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: chem community credit
- Replies: 8
- Views: 444
Re: chem community credit
Don't worry, all it was saying is that 2/5 of your posts for this week have to answer questions so that you aren't just asking 5 questions!
- Mon Mar 07, 2022 4:09 pm
- Forum: Second Order Reactions
- Topic: Final
- Replies: 32
- Views: 2532
Re: Final
Hello! I'm assuming it will be very similar to the 14A final, which had questions from all of the outlines
- Mon Mar 07, 2022 4:06 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: achieve week 9 and 10 question 5
- Replies: 6
- Views: 365
Re: achieve week 9 and 10 question 5
The rate law tells us that A is first order and B is second order, so [A]=(1/2)^1=1/2 and [B]=3^2=9. You then multiply 0.0840*(1/2)*9 to get your final answer. You can apply the same technique to the second half of the problem.
- Mon Mar 07, 2022 4:02 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Where is the solution Error Guide Manual
- Replies: 4
- Views: 363
Re: Where is the solution Error Guide Manual
Hello! You will be able to find it if you scroll down on the homepage of Lavelle's 14B website :)
- Mon Mar 07, 2022 3:59 pm
- Forum: Balancing Redox Reactions
- Topic: oxidation numbers
- Replies: 25
- Views: 1717
Re: oxidation numbers
Using the rules that others have posted in the comments, you can determine what the oxidation numbers of other molecules in a compound are to give the overall charge of the compound
- Mon Mar 07, 2022 3:56 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Kinetics vs. Thermodynamics
- Replies: 59
- Views: 2234
Re: Kinetics vs. Thermodynamics
Thermodynamics tells us about whether a reaction is likely to occur, while kinetics tells us how fast a reaction will occur
- Mon Mar 07, 2022 3:52 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Activation Energy
- Replies: 89
- Views: 3650
Re: Activation Energy
Adding a catalyst lowers the activation energy for both the forward and reverse reactions
- Mon Mar 07, 2022 3:51 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: zero order reaction
- Replies: 29
- Views: 1480
Re: zero order reaction
Hello! The intergrated equation for a zero-order reaction is A=-kt+A0. According to this equation, the slope of the line is -k
- Mon Mar 07, 2022 3:47 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Temp
- Replies: 56
- Views: 2219
Re: Temp
Hello! Yes, the equation only works in Kelvin. The conversion is Kelvin=Celsius+273.15
- Mon Mar 07, 2022 3:44 pm
- Forum: First Order Reactions
- Topic: graph
- Replies: 23
- Views: 778
Re: graph
The graph ln[A] vs. time should have a linear downward slope. The slope should be -k
- Mon Mar 07, 2022 3:43 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Checking-In :)
- Replies: 34
- Views: 1338
Re: Checking-In :)
I've found the content to be more difficult but also way more interesting so I've been doing better this quarter than in 14A
- Mon Mar 07, 2022 3:38 pm
- Forum: General Rate Laws
- Topic: spontaneity
- Replies: 36
- Views: 1175
Re: spontaneity
Hello! So spontaneity doesn't tell us about the speed of the reaction, only how likely it is to occur by itself, so fast doesn't equal spontaneous
- Mon Mar 07, 2022 3:36 pm
- Forum: General Rate Laws
- Topic: units
- Replies: 19
- Views: 744
Re: units
My thinking is that since the units for rate is always M/s (or m/L*s), what units for k do I need so that everything cancels out to M/s? For example, the rate equation is rate=k, so for that, the units of k would be M/s. For the 1st order, the equation is rate=k[A], so we know that k has to have se...
- Mon Feb 28, 2022 3:51 pm
- Forum: Phase Changes & Related Calculations
- Topic: delta H
- Replies: 98
- Views: 7518
Re: delta H
Delta H is referring to the change of heat in a system. A negative delta H means the system is losing heat, and a positive delta H means that the system is gaining heat
- Mon Feb 28, 2022 3:49 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Respondus Question
- Replies: 17
- Views: 798
Re: Respondus Question
All of the values listed are state functions
- Mon Feb 28, 2022 3:43 pm
- Forum: Balancing Redox Reactions
- Topic: anode vs cathode
- Replies: 77
- Views: 2834
Re: anode vs cathode
The anode (-) is on the left side and is the half of the reaction being oxidized, the cathode (+) is on the right side and is the half being reduced
- Mon Feb 28, 2022 3:41 pm
- Forum: Student Social/Study Group
- Topic: How do you deal with burnout?
- Replies: 144
- Views: 25354
Re: How do you deal with burnout?
For me, moving around throughout the day to different study spaces helps me stay focused and not fall asleep. But, it is really important to give yourself breaks! I know I can't go more than an hour and a half without a break, otherwise I end up getting absolutely nothing done.
- Mon Feb 28, 2022 3:39 pm
- Forum: Student Social/Study Group
- Topic: New Chill Music :)
- Replies: 52
- Views: 3348
Re: New Chill Music :)
Phoebe Bridgers, Jhene Aiko, Lucy Dacus, Daniel Caeser, and Dominic Fike are some of my favorites
- Mon Feb 28, 2022 3:35 pm
- Forum: Student Social/Study Group
- Topic: Study Tips
- Replies: 35
- Views: 1896
Re: Study Tips
Doing the assigned problems from the textbook is super helpful, especially since some of them show up on the exams! It also just helps you feel more prepared since you know what kinds of problems you are going to have to do
- Mon Feb 28, 2022 3:34 pm
- Forum: Student Social/Study Group
- Topic: Places to visit in Westwood
- Replies: 18
- Views: 1217
Re: Places to visit in Westwood
Definitely check out the Hammer museum! Also, Espresso Profeta is a nice study spot
- Mon Feb 28, 2022 3:32 pm
- Forum: Student Social/Study Group
- Topic: Fun Activities for Free Time
- Replies: 12
- Views: 772
Re: Fun Activities for Free Time
You can take the bus to Santa Monica, or go to the Getty, or check out the Hammer museum!
- Mon Feb 28, 2022 3:31 pm
- Forum: Student Social/Study Group
- Topic: Exercising Mind and Body
- Replies: 15
- Views: 839
Re: Exercising Mind and Body
I like to go for walks around campus!
- Sun Feb 27, 2022 9:04 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: calculating entropy using degeneracy
- Replies: 1
- Views: 139
Re: calculating entropy using degeneracy
There was a problem using degeneracy in the homework problems on the syllabus, and the first two learning outcomes on outline 4 had to do with this, but I don't know if we would be tested on it.
- Sun Feb 27, 2022 9:00 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: HW WEEK 7/8 #7
- Replies: 7
- Views: 321
Re: HW WEEK 7/8 #7
For the line diagram, Cl- is closest to the double lines on both sides. You don't need to include stoichiometric coefficients in the cell diagram, and the anode (oxidation half) goes on the left and the cathode (reduction half) goes on the right!
- Sun Feb 27, 2022 8:58 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: 4I.9, free expansion
- Replies: 3
- Views: 208
Re: 4I.9, free expansion
There is no work being done, so delta U is zero and so is q. Delta Ssurr=-q/T=0
- Sun Feb 27, 2022 8:56 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Reducing Agent Vs Oxidizing Agent
- Replies: 14
- Views: 537
Re: Reducing Agent Vs Oxidizing Agent
The molecule being oxidized is losing electrons and giving them to the molecule being reduced, so it is acting as the reducing agent, and vice versa for oxidizing agent. Oxidized=Reducing agent, Reduced=Oxidizing agent
- Sun Feb 27, 2022 8:54 pm
- Forum: Balancing Redox Reactions
- Topic: Achieve week 7/8 #5
- Replies: 7
- Views: 418
Re: Achieve week 7/8 #5
Once you separate the reaction into the reduction and oxidation halves, add H2O and OH- as necessary to balance it. Also, check out this document for help when balancing in basic conditions! https://lavelle.chem.ucla.edu/wp-content/supporting-files/Chem14B/Balancing_Redox_Reactions_Basic_Conditions....
- Sun Feb 27, 2022 8:51 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Achieve week 7&8 Q7
- Replies: 5
- Views: 503
Re: Achieve week 7&8 Q7
In the cathode half of the reaction you need 2Ag!
- Sun Feb 27, 2022 8:51 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Oxidizing Agent
- Replies: 35
- Views: 1370
Re: Oxidizing Agent
Correct, the higher the standard reduction potential, the better the oxidizing agent
- Sun Feb 27, 2022 8:50 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Achieve #18
- Replies: 4
- Views: 259
Re: Achieve #18
Your reactants in this case are Fe, O2, and H2O. To balance the products, any coefficient you put in front of the Fe will apply to both sides of the black circle
- Sun Feb 27, 2022 8:48 pm
- Forum: Balancing Redox Reactions
- Topic: Achieve #5
- Replies: 5
- Views: 343
Re: Achieve #5
I don't know if you put that OH- was aqueous in your answer or not, but make sure to include the phases or achieve will mark it incorrect!
- Sun Feb 27, 2022 8:46 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Finding Q
- Replies: 47
- Views: 1944
Re: Finding Q
Q is the concentration of products over the concentration in reactants, in this problem it would be 0.824/0.0190M
- Sun Feb 27, 2022 8:45 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cannot add/subtract E values
- Replies: 1
- Views: 139
Re: Cannot add/subtract E values
Yes, you can use Gnaught=-nFEnaught to relate them
- Sun Feb 27, 2022 8:41 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Nernst Equation (K Set Up)
- Replies: 1
- Views: 142
Re: Nernst Equation (K Set Up)
I was also really confused about this, since the cathode is on the right side of the electrode I figured it would be the product
- Sun Feb 27, 2022 8:39 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: entropy
- Replies: 6
- Views: 314
Re: entropy
The greater the number of atoms, the more positions they are capable of occupying, and the higher the entropy
- Sun Feb 27, 2022 8:38 pm
- Forum: Balancing Redox Reactions
- Topic: Achieve #3 (Week 7/8)
- Replies: 3
- Views: 208
Re: Achieve #3 (Week 7/8)
For the Ag half of the reaction, all you need to do is add electrons to the more positive side to balance the charges. For the oxidation half, add OH- and H2O molecules to balance the equation
- Sun Feb 27, 2022 8:35 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Finding n
- Replies: 50
- Views: 1796
Re: Finding n
Hello! n is the number of electrons being transferred from the reduction half of the reaction to the oxidation half of the reaction. You can find n by balancing both halves of the redox reaction
- Sun Feb 27, 2022 8:31 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Cell Potentials
- Replies: 6
- Views: 331
Re: Cell Potentials
Hello! The cell here is basically referring to the two halves of the reaction together, so the oxidation (anode) and reduction (cathode)
- Sun Feb 27, 2022 8:30 pm
- Forum: Balancing Redox Reactions
- Topic: Clarification on writing separated redox reactions
- Replies: 6
- Views: 370
Re: Clarification on writing separated redox reactions
We are adding the electrons to show how much the charge of the oxidized/reduced molecule is changing. We also need to make sure that the charge is balanced between both half reactions
- Sun Feb 27, 2022 8:28 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Help on Achieve Homework #9
- Replies: 1
- Views: 194
Re: Help on Achieve Homework #9
You can determine which one to subtract by calculating which way makes E positive!
- Sun Feb 27, 2022 8:26 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: E cell and concentration
- Replies: 7
- Views: 372
Re: E cell and concentration
You can use the Nernst equation, Ecell=Ecell naught-(RT/nF)lnQ
- Sun Feb 27, 2022 8:23 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Achieve HW #12
- Replies: 5
- Views: 350
Re: Achieve HW #12
Hi! You first separate it into two half reactions, then use the chart to find the standard reduction potential of each half, then use delta G naught = -nFE to calculate the free energy change. In this case, n is the number of electrons transferred, which you can find using your half reactions
- Sat Jan 22, 2022 8:23 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Amine
- Replies: 2
- Views: 182
Amine
On the homework, there was a question about calculating the Kb for an amine, but I wasn't sure what an amine is. Could someone explain?
- Sat Jan 22, 2022 8:21 pm
- Forum: Conjugate Acids & Bases
- Topic: Monoprotic
- Replies: 5
- Views: 719
Monoprotic
Could someone define what a monoprotic weak acid is? I wasn't sure what this meant on the homework
- Sat Jan 22, 2022 8:18 pm
- Forum: General Science Questions
- Topic: Midterm 1 [ENDORSED]
- Replies: 69
- Views: 5232
Re: Midterm 1 [ENDORSED]
February 2nd! I hope it is announced whether its going to be online or not soon, but I would assume it's going to be in person
- Sat Jan 22, 2022 8:16 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: pKa and pH [ENDORSED]
- Replies: 33
- Views: 4051
Re: pKa and pH [ENDORSED]
I was also confused about this! For weak acids, if pH is greater than pKa, there is more of the charged species; if pKa is greater than pH, there is more of the neutral species. For weak bases, the opposite is true.
- Mon Jan 03, 2022 4:46 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kc or Kp
- Replies: 5
- Views: 322
Kc or Kp
I'm a little confused about when to use Kc vs Kp since Dr. Lavelle said we don't need to include solids or liquids when solving for the equilibrium constant?
- Fri Dec 03, 2021 10:56 am
- Forum: Student Social/Study Group
- Topic: How was your Thanksgiving break?
- Replies: 17
- Views: 1560
Re: How was your Thanksgiving break?
Mine was really good! I got to see my dogs and my little brother :) I'm really excited to go back for winter break!
- Fri Dec 03, 2021 10:55 am
- Forum: Student Social/Study Group
- Topic: Anxiety
- Replies: 109
- Views: 11023
Re: Anxiety
With this class, I try to spread out my studying as much as possible. I do one topic a day so I don't get too overwhelmed and try to do practice problems. Mostly just remember that chemistry is a difficult subject, and don't be afraid to ask for help when you need it!
- Fri Dec 03, 2021 10:52 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polarity [ENDORSED]
- Replies: 8
- Views: 581
Re: Polarity [ENDORSED]
once you draw the lewis structure, pay attention to where the dipole moments are pointing. If they're in opposite directions, they cancel out and the molecule is nonpolar
- Fri Dec 03, 2021 10:50 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular Geometry Angles [ENDORSED]
- Replies: 12
- Views: 633
Re: Molecular Geometry Angles [ENDORSED]
I believe the main angles we have to know are 180, 120, 109.5, and 90
- Fri Dec 03, 2021 10:49 am
- Forum: Student Social/Study Group
- Topic: Lavelle’s Intro Songs
- Replies: 22
- Views: 2060
Re: Lavelle’s Intro Songs
Hahahah this is incredible thank you!!
- Fri Dec 03, 2021 10:47 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR [ENDORSED]
- Replies: 73
- Views: 6213
Re: VSEPR [ENDORSED]
VSEPR=valence shell electron pair repulsion theory, it tells us about the molecular geometry of a molecule based on the number of bonds and lone pairs
- Thu Dec 02, 2021 10:26 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4061206
Re: Post All Chemistry Jokes Here
Kayla Ziebell 1H wrote:Anyone heard any good jokes about sodium . . .
Na
This actually made me laugh
- Thu Dec 02, 2021 10:25 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4061206
Re: Post All Chemistry Jokes Here
what is the second-best public university's favorite element?
Berkelium
Berkelium
- Thu Dec 02, 2021 10:23 am
- Forum: Resonance Structures
- Topic: favorable resonance structures
- Replies: 46
- Views: 2904
Re: favorable resonance structures
You should calculate the formal charge for each atom and determine which structure has the lowest overall formal charge
- Thu Dec 02, 2021 10:22 am
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 1
- Views: 188
Final
How is everyone planning on studying for the final these last couple days?
- Thu Dec 02, 2021 10:20 am
- Forum: *Black Body Radiation
- Topic: What is black body radiation?
- Replies: 10
- Views: 821
Re: What is black body radiation?
Will we need to know this on the final?
- Thu Dec 02, 2021 10:17 am
- Forum: Administrative Questions and Class Announcements
- Topic: Textbook Inquiry [ENDORSED]
- Replies: 29
- Views: 69146
Re: Textbook Inquiry [ENDORSED]
Yes, it's available for download on the chem 14a website!
- Thu Dec 02, 2021 10:16 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: chelating ligands [ENDORSED]
- Replies: 51
- Views: 102750
Re: chelating ligands [ENDORSED]
Sigma bonds can rotate, pi bonds can't!
- Thu Dec 02, 2021 10:15 am
- Forum: Student Social/Study Group
- Topic: Culinary Chemistry
- Replies: 239
- Views: 46424
Re: Culinary Chemistry
This is such a cool thread, thank you!!!
- Thu Dec 02, 2021 10:13 am
- Forum: Administrative Questions and Class Announcements
- Topic: Accessing the E-textbook [ENDORSED]
- Replies: 125
- Views: 37383
Re: Accessing the E-textbook [ENDORSED]
Currently, you get access to the E-textbook automatically because you need to access achieve to complete the homework assignments
- Thu Dec 02, 2021 10:11 am
- Forum: Administrative Questions and Class Announcements
- Topic: Tutoring? [ENDORSED]
- Replies: 121
- Views: 320244
Re: Tutoring? [ENDORSED]
The peer learning sessions are also super helpful if you can't get a private tutor!
- Thu Dec 02, 2021 10:11 am
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 347
- Views: 495035
Re: Rusty on High School Chem [ENDORSED]
Dr. Lavelle has been really understanding about this, starting each new section of the class (each outline) with a review of the topics you need to know from high school!
- Thu Dec 02, 2021 10:09 am
- Forum: Student Social/Study Group
- Topic: Chemistry News
- Replies: 135
- Views: 181066
Re: Chemistry News
Thank you for starting this thread, everything here is super interesting!!
- Thu Dec 02, 2021 10:09 am
- Forum: Administrative Questions and Class Announcements
- Topic: How to list Chem_Mod posts
- Replies: 25
- Views: 94905
Re: How to list Chem_Mod posts
Thank you!!!
- Thu Dec 02, 2021 10:08 am
- Forum: Administrative Questions and Class Announcements
- Topic: How to find my posts
- Replies: 163
- Views: 184366
Re: How to find my posts
The way I usually do it is the "your posts" link under quick links
- Thu Dec 02, 2021 10:07 am
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 695266
Re: Saying Thank You to Dr. Lavelle
Thank you Dr. Lavelle!
It has been a great quarter even in an online class. I'm excited to get to attend lectures in person next quarter!
It has been a great quarter even in an online class. I'm excited to get to attend lectures in person next quarter!
- Thu Dec 02, 2021 10:05 am
- Forum: Hybridization
- Topic: Delocalized vs. Localized
- Replies: 14
- Views: 3055
Re: Delocalized vs. Localized
I'm pretty localized electrons stay associated with only one atom, while delocalized electrons are spread out throughout the molecule
- Thu Dec 02, 2021 10:04 am
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 161557
Re: Reading the textbook
I try to only go to the textbook when I'm really confused on a topic, otherwise, TAs are generally more helpful for specific questions. I also get stressed out by the language in the textbook
- Thu Dec 02, 2021 10:02 am
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student [ENDORSED]
- Replies: 297
- Views: 495053
Re: Advice from a Medical Student [ENDORSED]
Thank you so much, this was really helpful to read!
- Thu Dec 02, 2021 10:02 am
- Forum: Hybridization
- Topic: Pi Bonds [ENDORSED]
- Replies: 38
- Views: 1826
Re: Pi Bonds [ENDORSED]
So pi bonds only form when there are double and triple bonds forming?
- Thu Dec 02, 2021 10:01 am
- Forum: Hybridization
- Topic: Hybridization
- Replies: 7
- Views: 719
Hybridization
Hi! I'm pretty confused about how you determine the type of hybridization that is occurring, could someone explain?
- Thu Dec 02, 2021 9:56 am
- Forum: Lewis Acids & Bases
- Topic: H vs H3O
- Replies: 70
- Views: 4678
Re: H vs H3O
They are the same! H+ is just a simplified way to write H3O+
- Thu Dec 02, 2021 9:55 am
- Forum: Electronegativity
- Topic: Shape
- Replies: 20
- Views: 1275
Re: Shape
VSEPR charts are super helpful for determining shape based on the number of bonds and lone pairs!
- Thu Dec 02, 2021 9:53 am
- Forum: Conjugate Acids & Bases
- Topic: what's the difference?
- Replies: 14
- Views: 800
Re: what's the difference?
Hi! When a base accepts a proton, it forms a conjugate acid, and when an acid donates a proton, it forms a conjugate base
- Thu Dec 02, 2021 9:51 am
- Forum: Bronsted Acids & Bases
- Topic: Bronsted vs Lewis
- Replies: 7
- Views: 390
Re: Bronsted vs Lewis
Thank you for the explanations, can a base be both a lewis base and a bronsted base?
- Thu Dec 02, 2021 9:48 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligand names
- Replies: 7
- Views: 848
Re: Ligand names
Thank you for the quizlet!
- Thu Dec 02, 2021 9:46 am
- Forum: Lewis Acids & Bases
- Topic: Classifying Salts as acid, base, or neutral
- Replies: 3
- Views: 438
Re: Classifying Salts as acid, base, or neutral
So it depends on both the charges of the ions and the strength of the positive or negative charges?
- Thu Dec 02, 2021 9:43 am
- Forum: Polyprotic Acids & Bases
- Topic: Polyprotic Bases
- Replies: 3
- Views: 398
Re: Polyprotic Bases
I was also confused about this, thank you for the explanations!
- Thu Dec 02, 2021 9:41 am
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Achieve #12
- Replies: 5
- Views: 290
Re: Achieve #12
The more oxygen atoms there are, the more polar and more stable the compound is, making it a weak acid
- Thu Dec 02, 2021 9:39 am
- Forum: Lewis Structures
- Topic: Lewis Structure for Compounds
- Replies: 5
- Views: 411
Re: Lewis Structure for Compounds
as other people said, when the compound is covalent you draw lines for the bonds, but when it is ionic you draw the atoms separately with their charges indicated
- Thu Dec 02, 2021 9:35 am
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 479150
Re: Final Jitters
I'm also really nervous about this final, I feel super unprepared because I haven't taken chemistry since sophomore year of high school
- Thu Dec 02, 2021 9:34 am
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 479150
Re: Final Jitters
I usually try to finish my studying early the night before and don't do anymore the morning of the test, it only stresses me out more at that point. Eating a good breakfast the morning of the exam is super important!
- Mon Oct 18, 2021 10:33 am
- Forum: SI Units, Unit Conversions
- Topic: Achieve Due Dates [ENDORSED]
- Replies: 37
- Views: 2122
Re: Achieve Due Dates [ENDORSED]
Hello, I am a bit confused/overwhelmed with the achieve week 2,3,4. I have completed most with the exception of two problems I planned to go to an office hours to discuss over the course of this week. I went to office hours over the weekend and since the review sessions were midterm review, I was f...
- Mon Oct 18, 2021 10:31 am
- Forum: Significant Figures
- Topic: At what stage in your your work do you keep track of sig figs? [ENDORSED]
- Replies: 67
- Views: 5267
Re: At what stage in your your work do you keep track of sig figs? [ENDORSED]
I usually keep my full unrounded answers throughout the problem and state my final answer with the correct number of significant figures
- Sat Oct 09, 2021 5:12 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg Constant
- Replies: 4
- Views: 257
Re: Rydberg Constant
I was confused about what this constant actually was too, could someone also explain what Planck's constant is?
- Sat Oct 09, 2021 5:08 pm
- Forum: DeBroglie Equation
- Topic: Detectable wavelength
- Replies: 4
- Views: 281
Re: Detectable wavelength
If the wavelength is less that 10^-15 m it is too small to be detected, anything larger than this will be detectable in a lab
- Sat Oct 09, 2021 5:06 pm
- Forum: Properties of Light
- Topic: speed of light
- Replies: 15
- Views: 753
Re: speed of light
The speed of light is a constant, at least in this class! So yes we can always use 3.00x10^8
- Sat Oct 09, 2021 5:04 pm
- Forum: Limiting Reactant Calculations
- Topic: Discussion Calculation Question
- Replies: 5
- Views: 336
Re: Discussion Calculation Question
The two reagents are always present in a one to two ratio, so you have to multiply the amount of the limiting reactant by this ratio to determine how much of the excess reagent will be used
- Sat Oct 09, 2021 5:01 pm
- Forum: SI Units, Unit Conversions
- Topic: Molar Mass of Compounds with Coefficients
- Replies: 5
- Views: 356
Re: Molar Mass of Compounds with Coefficients
The molar mass of the compound remains the same, the coefficient just tells you that you have two moles of the substance
- Sun Oct 03, 2021 1:49 pm
- Forum: Limiting Reactant Calculations
- Topic: Setting up stoichiometry calculations (guide):
- Replies: 3
- Views: 226
Re: Setting up stoichiometry calculations (guide):
Thank you for sharing! I've been struggling to remember how to perform stoichiometry calculations and I was still a little confused about the molar ratio but this is super helpful for setting up the problems!