Search found 51 matches
- Sat Mar 14, 2020 5:49 pm
- Forum: General Science Questions
- Topic: Final Overview
- Replies: 5
- Views: 468
Re: Final Overview
definitely thermodynamics and chemical kinetics. Thermodynamics is what I personally struggled with the most and chemical kinetics hasn't been tested on before so you can expect to see some potentially unfamiliar material there on the test. Good luck!
- Sat Mar 14, 2020 5:45 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grading Scale
- Replies: 16
- Views: 1029
Re: Grading Scale
Alfred Barrion 2H wrote:I think its really similar to Chem 14A, 50% is a C-, and he will scale depending on class performance, but it will not hurt you.
phew, glad to know the curve won't work against us! Thanks!
- Sat Mar 14, 2020 5:44 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: What was your favorite chem topic?
- Replies: 137
- Views: 8565
Re: What was your favorite chem topic?
once I got the hang of it, Electrochemistry was by far my favorite!
- Sat Mar 14, 2020 5:39 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Activation energy
- Replies: 7
- Views: 433
Re: Activation energy
As far as I know, it is measured in J/M or kJ/M
- Sat Mar 14, 2020 5:37 pm
- Forum: Student Social/Study Group
- Topic: Coronavirus Joke
- Replies: 14
- Views: 1757
Re: Coronavirus Joke
this is a good one! Like, WHO is flying the plane?? haha!
- Sat Mar 14, 2020 5:35 pm
- Forum: Administrative Questions and Class Announcements
- Topic: final exam - question
- Replies: 6
- Views: 653
Re: final exam - question
omg I was wondering the same thing. Can anyone clarify?
- Fri Mar 13, 2020 7:56 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 11
- Views: 701
Re: Final
So are we going to have 4 hours or 3 hours on the final? I know its not a super pressing matter, but I am curious
- Fri Mar 13, 2020 4:33 pm
- Forum: Administrative Questions and Class Announcements
- Topic: "Open Book" Final?
- Replies: 30
- Views: 1946
Re: "Open Book" Final?
I believe that pretty much anything goes at this point as long as you aren't plagiarizing
- Fri Mar 13, 2020 4:31 pm
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: 3rd law
- Replies: 3
- Views: 341
Re: 3rd law
"The entropy of a system approaches a constant value as its temperature approaches absolute zero."
- Fri Mar 13, 2020 4:30 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 11
- Views: 701
Re: Final
yeah, he's been providing information on finals in his emails
- Fri Mar 13, 2020 4:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 513187
Re: Saying Thank You to Dr. Lavelle
I know with the whole Coronavirus situation things must be incredibly stressful for Lavelle and all UCLA professors, so I just wanted to say thank you to Lavelle for working diligently to ensure finals are administrated in as fair a manner as possible and for keeping us students updated
- Tue Mar 10, 2020 7:35 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Situation for Lecture, Discussion, and Final
- Replies: 3
- Views: 331
Re: Situation for Lecture, Discussion, and Final
Yeah, Lavelle is supposed to send out an Email
- Tue Mar 10, 2020 7:34 pm
- Forum: Student Social/Study Group
- Topic: The Final
- Replies: 5
- Views: 484
Re: The Final
yeah, it will probably be online. I'm assuming the review sessions will be canceled though which is kind of a bummer
- Sun Mar 08, 2020 11:45 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Notation Layout
- Replies: 7
- Views: 401
Re: Cell Notation Layout
thank you for the responses! I will make sure to keep the anode on the left when writing in cell notation! :)
- Sun Mar 08, 2020 11:42 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Formula Sheet
- Replies: 7
- Views: 514
Re: Formula Sheet
I think its the same one that we're always given, right?
- Sun Mar 08, 2020 11:41 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Calculating ln Q
- Replies: 20
- Views: 1449
Re: Calculating ln Q
Q is the concentration of the products of your balanced reaction divided by the concentration of the reactants. It is important to note that the concentrations are raised to the power of the coefficient value in front of a species.
- Sun Mar 08, 2020 11:40 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: galvanic vs electrolytic
- Replies: 12
- Views: 811
Re: galvanic vs electrolytic
In a electrolytic cell, energy from an external power source is used to drive a normally non-spontaneous reaction. In a galvanic cell, chemical energy is converted into electrical energy. The redox reaction is spontaneous and the anode is negative and the cathode is the positive electrode.
- Sun Mar 08, 2020 11:33 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: largeness of species and molar entropy
- Replies: 3
- Views: 319
Re: largeness of species and molar entropy
Is it just because larger species are more prone to disorder?
- Sun Mar 08, 2020 11:33 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: largeness of species and molar entropy
- Replies: 3
- Views: 319
largeness of species and molar entropy
can someone explain why exactly a larger species has greater molar entropy?
- Sun Mar 08, 2020 11:28 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Figuring out n
- Replies: 15
- Views: 925
Re: Figuring out n
n is the number of electrons needed to balance the reaction
- Sun Mar 08, 2020 11:27 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram
- Replies: 6
- Views: 430
Re: Cell Diagram
You represent all states of matter in a cell diagram
- Sun Mar 08, 2020 11:23 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Study Advice
- Replies: 73
- Views: 6749
Re: Study Advice
I usually do all the homework problems and before every lecture or review session, I will watch a video related to what I'm going to be learning about to refresh my memory if it has been a while since going over that topic. I tend to learn things really well auditorily so videos are helpful for me.
- Sun Mar 08, 2020 11:20 pm
- Forum: Balancing Redox Reactions
- Topic: Why do we flip E for oxidation?
- Replies: 13
- Views: 1068
Re: Why do we flip E for oxidation?
flipping E simply changes it from reduction to oxidation
- Sun Mar 08, 2020 11:19 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Notation commas
- Replies: 4
- Views: 308
Re: Cell Notation commas
Thank you for the replies! I get it now :)
- Sun Mar 08, 2020 11:18 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 333913
Re: Final Jitters
I usually focus on anxiety-preventive behaviors before my anxiety has the opportunity to come at me full force. I study early on to prevent cramming and take frequent breaks during long study sessions. Also, calling a trustworthy friend or a family member is a good way to calm down. Hope this helps ...
- Fri Mar 06, 2020 8:11 am
- Forum: Administrative Questions and Class Announcements
- Topic: Excellence in Chemistry Award!
- Replies: 27
- Views: 9816
Re: Excellence in Chemistry Award!
Congratulations!
- Mon Mar 02, 2020 10:26 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Notation Layout
- Replies: 7
- Views: 401
Cell Notation Layout
Does it matter which side you write the oxidation and reduction reactions for cell notation?
- Mon Mar 02, 2020 10:25 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Notation commas
- Replies: 4
- Views: 308
Cell Notation commas
What exactly do the commas between species indicate in cell notation?
- Sun Feb 23, 2020 4:24 pm
- Forum: General Science Questions
- Topic: Organic Chemistry Tutor?
- Replies: 6
- Views: 1923
Re: Organic Chemistry Tutor?
Also, just as a note: I have watched Lavelle's videos on his site and they were pretty helpful, but I'm looking for more online resources.
- Sun Feb 23, 2020 4:23 pm
- Forum: General Science Questions
- Topic: Organic Chemistry Tutor?
- Replies: 6
- Views: 1923
Organic Chemistry Tutor?
Hello, is anyone familiar with Organic Chem Tutor on Youtube? One of my friends swears by his videos but I don't want to sit through this 3-hour Thermodynamics video if it isn't super relevant to the course content. If Organic Chem Tutor isn't so great, does anyone know of other *free* online videos...
- Sun Feb 23, 2020 4:20 pm
- Forum: Balancing Redox Reactions
- Topic: Basic and Acidic Conditions
- Replies: 5
- Views: 380
Basic and Acidic Conditions
What is the difference between balancing a half-reaction "under basic conditions" and balancing one "under acidic conditions?"
- Sun Feb 23, 2020 4:19 pm
- Forum: Balancing Redox Reactions
- Topic: Adding H2O and OH- to Balance
- Replies: 5
- Views: 304
Re: Adding H2O and OH- to Balance
Additional Q: Are you trying to balance the charges on both sides of the half-reaction?
- Sun Feb 23, 2020 4:18 pm
- Forum: Balancing Redox Reactions
- Topic: Adding H2O and OH- to Balance
- Replies: 5
- Views: 304
Adding H2O and OH- to Balance
Can someone explain how adding H2O and OH- to balance a half-reaction works?
- Sun Feb 23, 2020 4:15 pm
- Forum: Balancing Redox Reactions
- Topic: Cell Potential Determining Strongest Agents
- Replies: 1
- Views: 104
Cell Potential Determining Strongest Agents
Based on the cell potential, how do you determine which species are the strongest reducing/oxidizing agents? I understand that it has to do with the highest cell potential for the forward and reverse reactions but which one is which and how come? Thanks!
- Sun Feb 23, 2020 4:11 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 513187
Re: Saying Thank You to Dr. Lavelle
I don't have a strong foundation in chemistry, but the extensive list of resources Dr. Lavelle has made available to us is saving my grade! Thank you for accommodating students from all chem backgrounds!
- Sun Feb 23, 2020 4:07 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Salt Bridge
- Replies: 9
- Views: 621
Re: Salt Bridge
the salt bridge transports electrons from the anode to the cathode
- Sun Feb 23, 2020 4:06 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Standard Cell Potential
- Replies: 4
- Views: 307
Re: Standard Cell Potential
yes, I believe flipping the reaction changes the sign of the cell potential
- Sun Feb 09, 2020 5:41 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Pizza Rolls - State Functions
- Replies: 5
- Views: 275
Pizza Rolls - State Functions
Does anyone remember the acronym that was used in the midterm review session to remember the state functions?
It was something like: "when you're Depressed watch TV..." ? ? ?
Or alternatively, does anyone have any other clever acronyms for state functions?
Thanks!
It was something like: "when you're Depressed watch TV..." ? ? ?
Or alternatively, does anyone have any other clever acronyms for state functions?
Thanks!
- Sun Feb 09, 2020 5:31 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2988722
Re: Post All Chemistry Jokes Here
Q: What did the photon say when it ran into the wall?
A: "Ow that hertz!"
A: "Ow that hertz!"
- Sun Feb 09, 2020 5:30 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2988722
Re: Post All Chemistry Jokes Here
Q: What kind of bear dissolves in water?
A: a POLAR bear!
A: a POLAR bear!
- Sat Feb 08, 2020 11:07 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Closed Systems
- Replies: 13
- Views: 649
Re: Closed Systems
Okay! That's what I thought. I know it was a simple question but I wanted to make sure. Thanks!
- Sat Feb 08, 2020 11:06 am
- Forum: Calculating Work of Expansion
- Topic: expansion vs nonexpansion
- Replies: 5
- Views: 186
Re: expansion vs nonexpansion
Thank you so much for the replies! It all makes sense now!
- Sat Feb 08, 2020 11:03 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Endothermic vs Exothermic
- Replies: 10
- Views: 509
Re: Endothermic vs Exothermic
wow! Thanks for the responses!
- Wed Jan 29, 2020 2:35 pm
- Forum: Calculating Work of Expansion
- Topic: expansion vs nonexpansion
- Replies: 5
- Views: 186
expansion vs nonexpansion
What was the difference between expansion work and nonexpansion work? In other words, what could create nonexpansion work? Compression?
- Wed Jan 29, 2020 2:33 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Endothermic vs Exothermic
- Replies: 10
- Views: 509
Endothermic vs Exothermic
can someone confirm whether this is true: in the delta U = q + w , a negative value for q indicates an exothermic reaction within the system and a positive value indicates an endothermic one
- Wed Jan 29, 2020 2:28 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Closed Systems
- Replies: 13
- Views: 649
Closed Systems
What were the ways that a closed system can be changed? Was it only by changing the temperature and/or volume?
- Wed Jan 29, 2020 2:21 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Changing Usernames on Chem Community
- Replies: 2
- Views: 132
Re: Changing Usernames on Chem Community
Thank you so much! Just changed my username
- Fri Jan 24, 2020 8:40 am
- Forum: Administrative Questions and Class Announcements
- Topic: Changing Usernames on Chem Community
- Replies: 2
- Views: 132
Changing Usernames on Chem Community
How do we change our usernames on chemistry community? Does it matter that mine isn't my real name/my section?
- Fri Jan 24, 2020 8:38 am
- Forum: Administrative Questions and Class Announcements
- Topic: Chemistry Community
- Replies: 1
- Views: 102
Chemistry Community
Are we able to make up lost points for posting on chem community by posting more than 5 posts the following week?
- Fri Jan 24, 2020 8:35 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Ka and Kb
- Replies: 10
- Views: 480
Re: Ka and Kb
yeah that's correct. Strong acids and bases also have Ka and Kb values
- Fri Jan 17, 2020 11:08 am
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student - Part II [ENDORSED]
- Replies: 298
- Views: 244828
Re: Advice from a Medical Student - Part II [ENDORSED]
Thank you for sharing! As someone who is on the fence about medicine, this was very inspiring!