Search found 100 matches
- Sat Mar 14, 2020 7:11 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: endgame 5
- Replies: 1
- Views: 235
endgame 5
For number 5, why is the first reaction flipped if it has a higher standard cell potential? Doesn't that mean it's the cathode?
- Sat Mar 14, 2020 4:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Submission
- Replies: 8
- Views: 736
Re: Final Submission
Lavelle just sent an email out about the format of the test and it's going to be through CCLE!
- Sat Mar 14, 2020 2:52 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Printing for Final
- Replies: 9
- Views: 721
Re: Printing for Final
We probably would have to print out the exam once Dr. Lavelle emails us with more information.
- Fri Mar 13, 2020 7:48 pm
- Forum: Administrative Questions and Class Announcements
- Topic: take home FINAL DEADLINE
- Replies: 15
- Views: 1054
Re: take home FINAL DEADLINE
He said he was going to send more detailed instructions on Saturday, but the time frame is probably going to be 3 hours since it's going to be short, but he may give us another hour to prep the exam, etc.
- Thu Mar 12, 2020 9:58 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: midterm q3c
- Replies: 3
- Views: 337
Re: midterm q3c
For this one, I had to think about it logically like the person above said. If you want to lower the pH, you have to add an acid. That's why A and C were the answers since they were both acidic.
- Wed Mar 11, 2020 3:29 pm
- Forum: Balancing Redox Reactions
- Topic: Ecell values
- Replies: 12
- Views: 790
Re: Ecell values
the one that has a higher (more positive) value is usually the one that is reduced aka the cathode
- Wed Mar 11, 2020 3:24 pm
- Forum: General Rate Laws
- Topic: 7A.9
- Replies: 4
- Views: 380
7A.9
Dinitrogen pentoxide, N2O5, decomposes by a first-order reaction. What is the initial rate of decomposition of N2O5 when 3.45 g of N2O5 is confined in a container of volume 0.750 L and heated to 65 8C? For this reaction, k1= 5.2x10^-3 s^-1 in the rate law (for the rate of decomposition of N2O5). How...
- Wed Mar 11, 2020 3:13 pm
- Forum: General Science Questions
- Topic: Final
- Replies: 7
- Views: 565
Re: Final
I would probably still study it a little bit, but there might not be a heavy emphasis because, in the email, he did say it was going to be shorter so that might mean he'll focus more on the new material.
- Wed Mar 11, 2020 3:05 pm
- Forum: Student Social/Study Group
- Topic: discussion
- Replies: 3
- Views: 364
discussion
Are the rest of the discussions going to be on Zoom or are they just canceled?
- Wed Mar 11, 2020 3:04 pm
- Forum: General Rate Laws
- Topic: Rate limiting step
- Replies: 13
- Views: 740
Rate limiting step
What is the rate-limiting step?
- Tue Mar 10, 2020 5:54 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2
- Replies: 5
- Views: 476
Test 2
How will Test 2 be distributed back if classes are online?
- Tue Mar 10, 2020 5:52 pm
- Forum: Administrative Questions and Class Announcements
- Topic: ENDGAME Review Session
- Replies: 71
- Views: 5467
Re: ENDGAME Review Session
thank you Lyndon for your service and help!!! i was wondering if there is any way you could do a live stream or Zoom this session.
- Sun Mar 08, 2020 11:04 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: kinetics vs thermo
- Replies: 3
- Views: 391
kinetics vs thermo
How do you determine whether it's kinetics or thermodynamics in regard to controlling a reaction? Is there a "hack" or a quick way to determine?
- Sun Mar 08, 2020 10:56 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Application
- Replies: 6
- Views: 461
Re: Application
G=-nFE
G=-RTlnK
These are the 2 equations you'll use.
G=-RTlnK
These are the 2 equations you'll use.
- Sun Mar 08, 2020 10:48 pm
- Forum: Van't Hoff Equation
- Topic: deriving
- Replies: 3
- Views: 352
deriving
I know on Test 2 we didn't need to know how to derive it, but do you think we will have to know how to derive it for the final?
- Sun Mar 08, 2020 10:45 pm
- Forum: Balancing Redox Reactions
- Topic: Why do we flip E for oxidation?
- Replies: 13
- Views: 1074
Re: Why do we flip E for oxidation?
Since it is given in cell potential, that means that it is a reduction. So, to get oxidation, you flip it.
- Sun Mar 08, 2020 10:42 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing a reaction
- Replies: 5
- Views: 366
Re: Balancing a reaction
1. find the half-reactions
2. balance O
3. balance H
4. balance the charges by adding electrons
If you go through the textbook, it has a really helpful example that shows you step by step!
2. balance O
3. balance H
4. balance the charges by adding electrons
If you go through the textbook, it has a really helpful example that shows you step by step!
- Sun Mar 08, 2020 10:34 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: test 1
- Replies: 2
- Views: 209
test 1
I was going over Test 1 to practice for the final and I was wondering if someone can help me solve this problem.
The pH of a 0.010 M solution of acetic acid is 3.37. What are Ka and percent ionization? I got the percent ionization right, but not the Ka.
The pH of a 0.010 M solution of acetic acid is 3.37. What are Ka and percent ionization? I got the percent ionization right, but not the Ka.
- Sun Mar 08, 2020 10:22 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: order
- Replies: 4
- Views: 381
order
How do I figure out the order of a reaction?
- Sun Mar 08, 2020 10:20 pm
- Forum: General Rate Laws
- Topic: arrhennius question
- Replies: 4
- Views: 278
arrhennius question
When do we use the Arrhenius equation? Like what are some keywords in a question to know whether or not to use this equation?
- Sun Mar 08, 2020 10:16 pm
- Forum: *Electrophiles
- Topic: final
- Replies: 7
- Views: 1822
Re: final
It's most likely going to cover all concepts, but there probably is going to be a heavier emphasis on kinetics and thermo.
- Sun Mar 08, 2020 8:04 pm
- Forum: Student Social/Study Group
- Topic: Test 2 Homework Problems, Etc
- Replies: 6
- Views: 399
Re: Test 2 Homework Problems, Etc
Sometimes, watching Youtube videos can be very helpful along with rereading the textbook.
- Sun Mar 08, 2020 4:30 pm
- Forum: Student Social/Study Group
- Topic: 03/06 Lecture
- Replies: 2
- Views: 223
Re: 03/06 Lecture
I can. What's your email?
- Wed Mar 04, 2020 10:43 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Units for G°
- Replies: 6
- Views: 403
Re: Units for G°
It's usually joules per mole
- Tue Mar 03, 2020 11:44 pm
- Forum: Balancing Redox Reactions
- Topic: Acidic and Basic Redox Reactions
- Replies: 9
- Views: 526
Re: Acidic and Basic Redox Reactions
I'm pretty sure it will tell us in the problem.
- Tue Mar 03, 2020 11:24 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: 6N.9
- Replies: 1
- Views: 176
6N.9
A tin electrode in 0.015 m Sn(NO3)2(aq) is connected to a hydrogen electrode in which the pressure of H2 is 1.0 bar. If the cell potential is 0.061 V at 25 8C, what is the pH of the electrolyte at the hydrogen electrode?
How do I derive an equation for the redox equation from this information?
How do I derive an equation for the redox equation from this information?
- Tue Mar 03, 2020 5:28 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: delta G=-nFE
- Replies: 1
- Views: 137
delta G=-nFE
How do you find the n in that equation?
- Tue Mar 03, 2020 5:22 pm
- Forum: Balancing Redox Reactions
- Topic: adding correct charge
- Replies: 4
- Views: 259
Re: adding correct charge
I think it's because you have to look at the net charge of the overall molecule instead of the charges of the components of the molecule.
- Tue Mar 03, 2020 5:20 pm
- Forum: Balancing Redox Reactions
- Topic: MnO4-
- Replies: 5
- Views: 358
Re: MnO4-
The overall molecule has a charge of -1 and we already know that oxygen has a charge of -2 and when you multiply by 4, you get a charge of -8. So, in order to get that -1 charge, Mn has to have a 7+ charge.
- Thu Feb 20, 2020 11:08 pm
- Forum: Student Social/Study Group
- Topic: What Song Was Playing During Lecture?
- Replies: 2
- Views: 286
Re: What Song Was Playing During Lecture?
I'm pretty sure the song is "Whatever It Takes" by Imagine Dragons!
- Tue Feb 11, 2020 9:35 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: 4H.5
- Replies: 4
- Views: 555
4H.5
4H.5 Which substance in each of the following pairs would you expect to have the higher standard molar entropy at 298 K and 1 bar? Explain your reasoning. (a) Iodine vapor or bromine vapor; (b) the two liquids cyclopentane and 1-pentene (see structures); (c) ethene (ethylene) or an equivalent mass o...
- Tue Feb 11, 2020 6:31 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 4D.1 Part B
- Replies: 1
- Views: 115
4D.1 Part B
4D.1 Carbon disulfide can be prepared from coke (an impure form of carbon) and elemental sulfur: 4 C(s) + S8(s) -> 4 CS2(l) delta H° = 358.8 kJ Calculate the heat absorbed in the reaction of 197 g of carbon with an excess of sulfur. Can someone walk me through this and break it down conceptually?
- Tue Feb 11, 2020 6:11 pm
- Forum: Phase Changes & Related Calculations
- Topic: 4C.11
- Replies: 2
- Views: 300
4C.11
4C.11 How much heat is needed to convert 80.0 g of ice at 0.0 8C into liquid water at 20.0 8C (see Tables 4A.2 and 4C.1)?
Can someone explain this problem to me?
Can someone explain this problem to me?
- Tue Feb 11, 2020 3:28 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: 4A.7
- Replies: 4
- Views: 258
4A.7
(a) Calculate the heat that must be supplied to a copper kettle of mass 400.0 g containing 300.0 g of water to raise its temperature from 20.0 C to the boiling point of water, 100.0 C. (b) What percentage of the heat is used to raise the temperature of the water? (See Table 4A.2.) How do I solve this?
- Tue Feb 04, 2020 2:09 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: Lecture on Feb.3
- Replies: 1
- Views: 121
Re: Lecture on Feb.3
I can send you the notes! What's your email?
- Tue Feb 04, 2020 2:08 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Missing Notes
- Replies: 2
- Views: 108
Re: Missing Notes
Knowing both delta u or delta h and delta s of a system provides info on how the system will change
- Tue Feb 04, 2020 2:07 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: closed vs isolated
- Replies: 14
- Views: 439
closed vs isolated
Can someone explain the difference between a closed and isolated system?
- Sun Feb 02, 2020 4:57 pm
- Forum: Student Social/Study Group
- Topic: Any Worksheets from UA/TA/etc?
- Replies: 14
- Views: 610
Re: Any Worksheets from UA/TA/etc?
Some UA's post their worksheets on Chem Community, so you can probably search up worksheets or review to find them!
- Sun Feb 02, 2020 4:54 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Three Methods
- Replies: 3
- Views: 174
Three Methods
How do I know which method to use? Are there like key words/terms that will help me determine which method to use when it comes to solving the problem?
- Sun Feb 02, 2020 2:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 4 Friday Lecture
- Replies: 4
- Views: 124
Re: Week 4 Friday Lecture
Yeah, I can! What's your email?
- Tue Jan 21, 2020 6:40 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grading of Tests
- Replies: 18
- Views: 685
Re: Grading of Tests
Most times, you do get partial credit if it makes sense. But, it also depends on the grader.
- Tue Jan 21, 2020 6:22 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 6D.3
- Replies: 1
- Views: 129
6D.3
6D.3 (a) When the pH of 0.10 m HClO2(aq) was measured, it was found to be 1.2. What are the values of Ka and pKa of chlorous acid? (b) The pH of a 0.10 m propylamine, C3H7NH2, aqueous solution was measured as 11.86. What are the values of Kb and pKb of propylamine? How do you get the concentration o...
- Tue Jan 21, 2020 4:03 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 5I.33
- Replies: 1
- Views: 117
5I.33
5I.33 A sample of ammonium carbamate, NH4(NH2CO2), of mass 25.0 g was placed in an evacuated flask of volume 0.250 L and kept at 25 8C. At equilibrium, 17.4 mg of CO2 was present. What is the value of Kc for the decomposition of ammonium carbamate into ammonia and carbon dioxide? The reaction is NH4...
- Tue Jan 21, 2020 1:50 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 51.13 Part C
- Replies: 1
- Views: 105
51.13 Part C
5I.13 (a) In an experiment, 2.0 mmol Cl2(g) was sealed into a reaction vessel of volume 2.0 L and heated to 1000. K to study its dissociation into Cl atoms. Use the information in Table 5G.2 to calculate the equilibrium composition of the mixture. (b) If 2.0 mmol F2 was placed into the reaction vess...
- Tue Jan 21, 2020 12:10 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: partial pressure vs concentrations
- Replies: 3
- Views: 104
partial pressure vs concentrations
When a problem is asking to write an expression for K, how do I know whether to use concentration or partial pressure?
- Sun Jan 12, 2020 11:44 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K and Q
- Replies: 6
- Views: 319
K and Q
I know that they are solved the same way but what is the difference between solving for K and solving for Q?
- Sun Jan 12, 2020 11:40 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Homogenous Equilibrium
- Replies: 13
- Views: 351
Re: Homogenous Equilibrium
it's when all reactants and products are in the same phase.
- Sun Jan 12, 2020 11:39 pm
- Forum: Ideal Gases
- Topic: ICE Table
- Replies: 11
- Views: 774
ICE Table
How do you use an ICE table?
- Sun Jan 12, 2020 11:32 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K's
- Replies: 3
- Views: 125
K's
What is the difference between Kc and Kp?
- Thu Jan 09, 2020 1:19 pm
- Forum: Student Social/Study Group
- Topic: Chemistry Community
- Replies: 8
- Views: 1291
Re: Chemistry Community
I'm pretty sure they count at the end, but it might depend on your TA.
- Sat Dec 07, 2019 10:36 pm
- Forum: Bronsted Acids & Bases
- Topic: Amphoteric
- Replies: 2
- Views: 220
Re: Amphoteric
You have to draw it out to figure out where the lone pairs are.
- Sat Dec 07, 2019 10:32 pm
- Forum: Naming
- Topic: Numerical Prefixes
- Replies: 2
- Views: 193
Re: Numerical Prefixes
You use bis, tris, etc when it comes to en and dien and edta.
- Sat Dec 07, 2019 6:30 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: pH sig figs
- Replies: 11
- Views: 612
pH sig figs
Do sig figs only count after the decimal when it comes to pH?
- Thu Dec 05, 2019 6:14 pm
- Forum: Naming
- Topic: Name --> formula
- Replies: 2
- Views: 208
Re: Name --> formula
I'm pretty sure both forms are acceptable, but I would probably do it alphabetically just in case.
- Thu Dec 05, 2019 6:13 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Determining Polarity
- Replies: 2
- Views: 94
Re: Determining Polarity
it's polar
hacks
Does anyone have a good way of memorizing the order of naming?
- Sun Dec 01, 2019 7:32 pm
- Forum: Student Social/Study Group
- Topic: Final Studying
- Replies: 8
- Views: 339
Re: Final Studying
The organic chemistry tutor is really good at explaining concepts.
- Sun Dec 01, 2019 7:29 pm
- Forum: Biological Examples
- Topic: Cisplatin
- Replies: 5
- Views: 294
Re: Cisplatin
There is a possibility we might have to know the structure of it as well because I think I read it somewhere on Bruinwalk.
- Sun Dec 01, 2019 5:12 pm
- Forum: Student Social/Study Group
- Topic: final
- Replies: 4
- Views: 307
final
Does anyone know what topics will be strongly emphasized on the final?
- Sun Dec 01, 2019 4:04 pm
- Forum: Student Social/Study Group
- Topic: readings
- Replies: 13
- Views: 876
Re: readings
I would read the sections that the homework problems are from. I think sections are also listed on the syllabus and the outlines. For studying, I recommend doing the homework problems and Youtube videos for extra practice!
- Sun Nov 24, 2019 11:07 pm
- Forum: Student Social/Study Group
- Topic: Any tips on how to catch up in this class?
- Replies: 16
- Views: 918
Re: Any tips on how to catch up in this class?
Youtube videos are super helpful and so are the step-up sessions! The UA's are really good at explaining concepts and they usually go through practice problems as well.
- Sun Nov 24, 2019 11:02 pm
- Forum: Hybridization
- Topic: octet expansion
- Replies: 1
- Views: 131
Re: octet expansion
Yes. Typically, elements in period 3 and above are able to have an expanded octet.
- Sun Nov 24, 2019 10:55 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3006894
Re: Post All Chemistry Jokes Here
I'm sad. All of the good chemistry jokes argon :(
- Sun Nov 24, 2019 10:52 pm
- Forum: Student Social/Study Group
- Topic: test 2
- Replies: 2
- Views: 251
test 2
When will test 2 scores be out on myucla? Are we getting our tests back this week?
- Sun Nov 24, 2019 10:50 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligands
- Replies: 4
- Views: 224
Ligands
What exactly is a ligand?
- Mon Nov 18, 2019 12:04 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR
- Replies: 2
- Views: 122
Re: VSEPR
valence shell electron pair repulsion model
- Sun Nov 17, 2019 5:31 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: 3F.3
- Replies: 1
- Views: 95
3F.3
Can someone explain this problem to me?
3F.3 For which of the following molecules will dipole–dipole interactions be important: (a) CH4; (b) CH3Cl; (c) CH2Cl2; (d) CHCl3; (e) CCl4?
3F.3 For which of the following molecules will dipole–dipole interactions be important: (a) CH4; (b) CH3Cl; (c) CH2Cl2; (d) CHCl3; (e) CCl4?
- Sun Nov 17, 2019 5:26 pm
- Forum: Student Social/Study Group
- Topic: test 2
- Replies: 8
- Views: 352
Re: test 2
Also, does anyone know how many questions will be on the test?
- Sun Nov 17, 2019 5:12 pm
- Forum: Student Social/Study Group
- Topic: test 2
- Replies: 8
- Views: 352
test 2
Does anyone know how many points test 2 will be worth?
- Sun Nov 17, 2019 5:03 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: identifying forces
- Replies: 2
- Views: 75
identifying forces
How do you identify the different forces between molecules?
- Sun Nov 10, 2019 7:55 pm
- Forum: Student Social/Study Group
- Topic: chem 14b + cehm14bl
- Replies: 9
- Views: 668
chem 14b + cehm14bl
Hi,
Does anyone know if it is better to take Chem 14B and Chem 14BL together or Chem14C and Chem14BL together? Or does it not really matter?
Does anyone know if it is better to take Chem 14B and Chem 14BL together or Chem14C and Chem14BL together? Or does it not really matter?
- Sun Nov 10, 2019 7:51 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: polarizability
- Replies: 2
- Views: 141
polarizability
Hi,
How can I use the periodic table to determine whether one element has higher polarizability compared to another element?
How can I use the periodic table to determine whether one element has higher polarizability compared to another element?
- Fri Nov 08, 2019 9:40 pm
- Forum: Student Social/Study Group
- Topic: midterm grades
- Replies: 8
- Views: 481
midterm grades
Will we be getting our tests back in our discussion section next week?
- Wed Nov 06, 2019 11:38 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Rydberg equation
- Replies: 9
- Views: 507
Re: Rydberg equation
It's preferred because it is easier to understand conceptually with the way he taught us in class.
- Wed Nov 06, 2019 11:34 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3006894
Re: Post All Chemistry Jokes Here
So... when's the midterm?
- Sun Nov 03, 2019 11:19 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: rydberg equation
- Replies: 2
- Views: 135
rydberg equation
Hi,
Are we allowed to actually use Rydbreg's equation or do we have to solve these types of problems the way Lavelle taught us in class?
Are we allowed to actually use Rydbreg's equation or do we have to solve these types of problems the way Lavelle taught us in class?
- Sun Nov 03, 2019 6:19 pm
- Forum: Lewis Structures
- Topic: lowest energy
- Replies: 5
- Views: 246
lowest energy
Hi,
What does it mean when it says to draw the lowest energy lewis structure?
What does it mean when it says to draw the lowest energy lewis structure?
- Sun Nov 03, 2019 6:12 pm
- Forum: Lewis Structures
- Topic: formal charge
- Replies: 6
- Views: 244
formal charge
Hi,
Does anyone know we have to use formal charge to check every lewis structure diagram we do on the midterm?
Does anyone know we have to use formal charge to check every lewis structure diagram we do on the midterm?
- Sun Nov 03, 2019 3:16 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: 1B.26
- Replies: 4
- Views: 160
Re: 1B.26
it's 10 m/s because it's a range from -5 to 5 m/s
- Sun Nov 03, 2019 3:01 pm
- Forum: *Shrodinger Equation
- Topic: Review
- Replies: 4
- Views: 413
Re: Review
The TA's and UA's typically have a list of topics they are going to go over and they go over the concepts while including practice problems as well. They're very helpful! Highly recommend.
- Sun Oct 27, 2019 11:52 pm
- Forum: Administrative Questions and Class Announcements
- Topic: HW 4
- Replies: 2
- Views: 86
Re: HW 4
I think it can be from both chemical bonds and the quantum world, but I would suggest emailing your TA just to make sure.
- Sun Oct 27, 2019 11:49 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 1E #13
- Replies: 3
- Views: 310
1E #13
How come the electron configuration for tungsten is [Xe]4f14 5d4 6s2 and not [Xe]4f14 5d5 6s1? Why didn't it follow the same rule as silver did?
- Sun Oct 27, 2019 11:44 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Midterm
- Replies: 5
- Views: 251
Re: Midterm
Hi! There is also this Youtuber called Tyler Dewit who has a video about electron configurations that is very helpful as well!
- Sun Oct 27, 2019 3:05 pm
- Forum: Ionic & Covalent Bonds
- Topic: Week 5 HW
- Replies: 4
- Views: 146
Week 5 HW
Hi,
Is this week's homework on just chemical bonds or can it also be from the quantum world?
Is this week's homework on just chemical bonds or can it also be from the quantum world?
- Sat Oct 26, 2019 5:56 pm
- Forum: Ionic & Covalent Bonds
- Topic: + and - ions
- Replies: 3
- Views: 252
Re: + and - ions
1) move left
2) move right
3) If it has a positive charge (aka a cation), it loses an electron.
4) If it has a negative charge (aka an anion), it gains an electron.
2) move right
3) If it has a positive charge (aka a cation), it loses an electron.
4) If it has a negative charge (aka an anion), it gains an electron.
- Sun Oct 20, 2019 11:25 pm
- Forum: Trends in The Periodic Table
- Topic: memorization
- Replies: 3
- Views: 271
memorization
Hi,
Does anyone have any tricks or recommendations to help memorize the trends in the periodic table and also the characteristics of nonmetals/metals/metalloids?
Does anyone have any tricks or recommendations to help memorize the trends in the periodic table and also the characteristics of nonmetals/metals/metalloids?
- Sun Oct 20, 2019 11:08 pm
- Forum: Student Social/Study Group
- Topic: Midterm
- Replies: 17
- Views: 818
Midterm
Does anyone know if the Fundamentals section is going to be on our midterm?
- Sun Oct 20, 2019 11:00 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: spin
- Replies: 3
- Views: 116
spin
Hi,
Why can't there be parallel spins? Also, how do you know whether to start it up or down for the spins?
Why can't there be parallel spins? Also, how do you know whether to start it up or down for the spins?
- Sun Oct 20, 2019 4:56 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Orbitals
- Replies: 8
- Views: 272
Orbitals
Hi,
In class, Lavelle went over some examples for the orbitals and he did Scandium as an example, but I am still a little confused on how why it is [Ar] 3d1, 4s2 and not the other way around.
In class, Lavelle went over some examples for the orbitals and he did Scandium as an example, but I am still a little confused on how why it is [Ar] 3d1, 4s2 and not the other way around.
- Sun Oct 20, 2019 4:53 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Advice for studying
- Replies: 92
- Views: 6502
Re: Advice for studying
Hi! I definitely recommend everything else everyone has said so far! For me, what works the best is doing everything he assigns and joining study groups! They are so helpful and collaborating with other students makes it easier to understand. I also watch Youtube videos; there is this one guy named ...
- Sun Oct 13, 2019 11:06 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: #1E 5
- Replies: 1
- Views: 87
#1E 5
Hi, Can someone explain why part a is false? I read the solutions manual, but I am still a little bit confused. Thank you! Which of the following statements are true for many-elec- tron atoms? If false, explain why. (a) The effective nuclear charge Zeffe is independent of the number of electrons pre...
- Sun Oct 13, 2019 10:04 pm
- Forum: *Black Body Radiation
- Topic: Will this concept be tested
- Replies: 8
- Views: 1173
Re: Will this concept be tested
No, it won't be tested.
- Sun Oct 13, 2019 10:00 pm
- Forum: DeBroglie Equation
- Topic: wavelike vs particle-like
- Replies: 2
- Views: 114
wavelike vs particle-like
Hi,
Can someone explain the difference between these two? Like what does it mean if something has wavelike properties but not particle-like and vice versa?
Can someone explain the difference between these two? Like what does it mean if something has wavelike properties but not particle-like and vice versa?
- Sun Oct 13, 2019 9:52 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: 1B #25
- Replies: 1
- Views: 114
1B #25
Hi,
Can someone please explain this problem to me? I don't understand it.
What is the minimum uncertainty in the speed of an electron confined within a lead atom of diameter 350. pm? Model the atom as a one-dimensional box with a length equal to the diameter of the actual atom.
Thank you!
Can someone please explain this problem to me? I don't understand it.
What is the minimum uncertainty in the speed of an electron confined within a lead atom of diameter 350. pm? Model the atom as a one-dimensional box with a length equal to the diameter of the actual atom.
Thank you!
- Sun Oct 13, 2019 9:38 pm
- Forum: Properties of Light
- Topic: 1B #5
- Replies: 1
- Views: 47
1B #5
I was just wondering if he expected us to know the constant in this problem or will he give it to us on tests?
- Sun Oct 06, 2019 4:18 pm
- Forum: Empirical & Molecular Formulas
- Topic: Polyatomic ions
- Replies: 2
- Views: 199
Re: Polyatomic ions
I'm not sure what exactly we have to know, but there is a table on F30 that has some common ones listed so I would probably want to know those.
- Sun Oct 06, 2019 2:18 pm
- Forum: Significant Figures
- Topic: Significant Figure numbers
- Replies: 2
- Views: 147
Re: Significant Figure numbers
it's the least amount of sigfigs that matter
- Sun Oct 06, 2019 2:16 pm
- Forum: SI Units, Unit Conversions
- Topic: Homework Vs. Test
- Replies: 3
- Views: 166
Re: Homework Vs. Test
Hi,
I'm pretty sure he is going to give us the formula, but I would brush up on the formulas for some basic compounds like nitric acid, etc just in case.
I'm pretty sure he is going to give us the formula, but I would brush up on the formulas for some basic compounds like nitric acid, etc just in case.
- Sun Oct 06, 2019 10:26 am
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: homework e9
- Replies: 1
- Views: 110
homework e9
Hi,
Can someone walk me through on finding the formula for magnesium sulfate heptahydrate and why 7 H2O is a part of the formula mass?
Can someone walk me through on finding the formula for magnesium sulfate heptahydrate and why 7 H2O is a part of the formula mass?
- Sun Oct 06, 2019 10:15 am
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Naming Formulas
- Replies: 3
- Views: 240
Naming Formulas
Hi, does anyone know if he expects us to know how to write formulas/compounds on the test? Was just wondering because some of the homework problems asked us to do so.