Search found 28 matches
- Sat Dec 08, 2018 10:18 pm
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: Final Exam
- Replies: 8
- Views: 2371
Re: Final Exam
pKA is the constant for acid dissociation and pKB has to do with base dissociation
- Fri Nov 30, 2018 2:53 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: 7th edition 3F. Question 3 part d.
- Replies: 2
- Views: 379
Re: 7th edition 3F. Question 3 part d.
It's probably just a mistake, since yes, LDF is an intermolecular force that always exists.
- Fri Nov 30, 2018 2:51 pm
- Forum: Air Pollution & Acid Rain
- Topic: Acid Rain on the Final
- Replies: 4
- Views: 712
Re: Acid Rain on the Final
We'll most likely go over it on Monday or Wednesday of next week since Lavelle wants to complete all the content by then.
- Fri Nov 30, 2018 2:49 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Cis and Trans
- Replies: 10
- Views: 957
Re: Cis and Trans
It's all situational and depends on the molecule's purpose.
- Sat Nov 24, 2018 2:02 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: double and triple bonds
- Replies: 10
- Views: 1090
Re: double and triple bonds
Whether it’s single, double, or triple, it is still one region of e- density so there is no change. Lone pairs, however, do affect bond angles of the VSEPR structure.
- Sat Nov 24, 2018 1:22 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: vsepr shape
- Replies: 6
- Views: 668
Re: vsepr shape
Taking into account formal charge and drawing out the correct Lewis structure will help you find the VSEPR model that corresponds to it. Finding a chart online or even making one on your own can help you memorize the bond angles, # lone pairs, etc. that are needed in each model.
- Sat Nov 24, 2018 1:16 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Seesaw bond angles
- Replies: 3
- Views: 409
Re: Seesaw bond angles
I believe there would be two <120 degree angles. The angle between the lone pair and each of the two bonding pairs that lie on the same plane as that lone pair is <120 degrees.
- Thu Nov 15, 2018 8:52 pm
- Forum: SI Units, Unit Conversions
- Topic: lewis structure shape
- Replies: 6
- Views: 903
Re: lewis structure shape
There are technically 12 from the 7th E textbook including pentagonal bipyramidal, though I don't think that shape would come up often compared to the other 11.
- Thu Nov 15, 2018 8:45 pm
- Forum: Electronegativity
- Topic: Is it best to memorize electronegativity?
- Replies: 8
- Views: 1926
Re: Is it best to memorize electronegativity?
I remember Professor Lavelle saying in class we did not need to know exact the exact values of electronegativity, but as long as we have an idea of them we should be absolutely fine.
- Thu Nov 15, 2018 8:40 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Memorizing the VSPER Models
- Replies: 4
- Views: 465
Re: Memorizing the VSPER Models
I feel like if you know the angles of the models or at least know the names, it is easier to visualize the shape just from that info alone. If you take, for example, square planar...the angles are 90 degrees and a model being "planar" implies it can only lie on one "plane"/be fla...
- Mon Nov 05, 2018 1:26 am
- Forum: Trends in The Periodic Table
- Topic: Higher Electron Affinity Nitrogen or Carbon
- Replies: 4
- Views: 1080
Re: Higher Electron Affinity Nitrogen or Carbon
Carbon; the half-filled shell is stabler than nitrogen's.
- Mon Nov 05, 2018 1:23 am
- Forum: Lewis Structures
- Topic: Acids and Bases
- Replies: 3
- Views: 390
Re: Acids and Bases
Species that donate e= are Lewis bases (e.g. NH3, F-, -OH) and species that accept e= are Lewis acids (e.g. BF3, H+).
- Mon Nov 05, 2018 1:17 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Heisenberg and Wavelength
- Replies: 11
- Views: 1681
Re: Heisenberg and Wavelength
wavelength=planck's constant/momentum, so wavelength and momentum do affect each other. However, I believe the question is looking for the answer explaining how the less we know about uncertainty in momentum, the less we know about uncertainty in position and vice-versa.
- Tue Oct 30, 2018 5:31 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Selling textbook?
- Replies: 2
- Views: 379
Re: Selling textbook?
I'm sure someone would buy, if not the entire set, one or two parts of it! You wouldn't get all your money back, but people next quarter could definitely use it and would prefer to purchase it if it is a lower price. Sorry if that isn't much help! Best of luck to you :)
- Tue Oct 30, 2018 5:25 pm
- Forum: Resonance Structures
- Topic: Resonance hybrids on the test?
- Replies: 2
- Views: 344
Re: Resonance hybrids on the test?
It's best to be prepared! Know how to do them, and unless otherwise specified on the test, go ahead and do it to ensure full points. Or, one of the midterm review sessions might be the best place to know for sure.
- Tue Oct 30, 2018 5:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Study Guide
- Replies: 1
- Views: 383
Re: Midterm Study Guide
I don't think there is a midterm study guide; maybe during one of the midterm review sessions you would be able to get a worksheet, paper, or just an idea of what exactly will be on the midterm.
- Tue Oct 23, 2018 12:23 am
- Forum: Properties of Electrons
- Topic: Nodal surfaces
- Replies: 3
- Views: 469
Re: Nodal surfaces
Radial nodes are spherical and angular nodes are flat
- Tue Oct 23, 2018 12:17 am
- Forum: Properties of Light
- Topic: SI Units
- Replies: 6
- Views: 584
Re: SI Units
Study the prefixes for sure, just so you recognize things such as picometer (pm) and any other more uncommon ones, not just nm and m. Know how to convert from kg to g to mg too, as well as remembering SI units from the previous section we covered
- Tue Oct 23, 2018 12:08 am
- Forum: Trends in The Periodic Table
- Topic: Properties of metal
- Replies: 1
- Views: 250
Re: Properties of metal
S-block metals have lower ionization energy, meaning that it takes up less energy for them to lose electrons. However, for p-block, they have higher ionization energies and more filled shells, requiring more energy to lose those additional electrons.
- Sun Oct 14, 2018 9:29 pm
- Forum: Properties of Electrons
- Topic: Diffraction patterns
- Replies: 9
- Views: 1063
Re: Diffraction patterns
An easy way to remember the difference between constructive (in phase) and destructive (out of phase) waves is that, in constructive waves, the peaks interact with the peaks and troughs interact with the troughs. Because of this interaction, they're in phase with each other. Deconstructive waves' pe...
- Sun Oct 14, 2018 9:16 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Homework Week 2
- Replies: 5
- Views: 461
Re: Homework Week 3
Is the week three homework strictly Quantum World? I know last week was flexible on which section to do problems for so I was wondering about this week. Yeah...it was never mentioned so I'm assuming it should be from Quantum World. Just to be safe, I'd do the 7 problems strictly from what we've cov...
- Sun Oct 14, 2018 9:11 pm
- Forum: Student Social/Study Group
- Topic: Studying techniques
- Replies: 12
- Views: 801
Re: Studying techniques
Taking notes while you watch the modules can help a lot; even though Lavelle goes over the same topics in lecture, it helps to have the content available to watch as many times as you want. And as people have said before me, there are tons of YouTube channels that help a lot. Watching videos is a lo...
- Tue Oct 09, 2018 10:45 pm
- Forum: SI Units, Unit Conversions
- Topic: Atoms and Molecules
- Replies: 5
- Views: 378
Re: Atoms and Molecules
As long as the problem does say you can use either atoms OR molecules as the unit, I'm sure they are interchangeable depending on context. Of course, if it specifies one rather than the other, then use that unit instead.
- Tue Oct 09, 2018 10:43 pm
- Forum: SI Units, Unit Conversions
- Topic: Ways to remember prefixes
- Replies: 7
- Views: 4833
Re: Ways to remember prefixes
I don't think there's an easy method to learn prefixes...Encountering problems with prefixes definitely help you to become familiar with them, but just as you would study vocabulary you could probably apply those studying methods to studying prefixes and their meanings.
- Tue Oct 09, 2018 10:40 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: E.23
- Replies: 2
- Views: 624
Re: E.23
You want to convert the grams given of each compound into the moles of each element/compound it asks you to calculate for. So, for example, in part a you're given 3.00g CuBr2; find its molar mass. Then to convert to moles of of Cu^2+ you have to know the mole-to-mole ratio of Cu^2+ and CuBr2. For ev...
- Wed Oct 03, 2018 2:44 pm
- Forum: Significant Figures
- Topic: Sig Figs when finding Mol
- Replies: 4
- Views: 9090
Re: Sig Figs when finding Mol
As long as your work is shown to lead to the answer with the correct number of sig figs, I don't think getting points docked would be an issue :)
- Wed Oct 03, 2018 2:29 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: mixtures and separation terminology
- Replies: 2
- Views: 232
Re: mixtures and separation terminology
I think just to be safe, it might help to understand the context of those vocab terms and it'll make sense later on if/when we do encounter them in problems.
- Wed Oct 03, 2018 2:18 pm
- Forum: Balancing Chemical Reactions
- Topic: Example H1, seventh edition.
- Replies: 2
- Views: 241
Re: Example H1, seventh edition.
Dr. Lavelle said we'd kind of become familiar with uncommon compounds as we go along, so I don't think we're expected to know them- at least, not right away.