Search found 28 matches

by 705152867
Sat Dec 08, 2018 10:18 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Final Exam
Replies: 8
Views: 887

Re: Final Exam

pKA is the constant for acid dissociation and pKB has to do with base dissociation
by 705152867
Fri Nov 30, 2018 2:51 pm
Forum: Air Pollution & Acid Rain
Topic: Acid Rain on the Final
Replies: 4
Views: 259

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.
by 705152867
Fri Nov 30, 2018 2:49 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Cis and Trans
Replies: 10
Views: 183

Re: Cis and Trans

It's all situational and depends on the molecule's purpose.
by 705152867
Sat Nov 24, 2018 2:02 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: double and triple bonds
Replies: 10
Views: 186

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.
by 705152867
Sat Nov 24, 2018 1:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: vsepr shape
Replies: 6
Views: 120

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.
by 705152867
Sat Nov 24, 2018 1:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Seesaw bond angles
Replies: 3
Views: 118

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.
by 705152867
Thu Nov 15, 2018 8:52 pm
Forum: SI Units, Unit Conversions
Topic: lewis structure shape
Replies: 6
Views: 382

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.
by 705152867
Thu Nov 15, 2018 8:45 pm
Forum: Electronegativity
Topic: Is it best to memorize electronegativity?
Replies: 8
Views: 390

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.
by 705152867
Thu Nov 15, 2018 8:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Memorizing the VSPER Models
Replies: 4
Views: 139

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...
by 705152867
Mon Nov 05, 2018 1:26 am
Forum: Trends in The Periodic Table
Topic: Higher Electron Affinity Nitrogen or Carbon
Replies: 4
Views: 305

Re: Higher Electron Affinity Nitrogen or Carbon

Carbon; the half-filled shell is stabler than nitrogen's.
by 705152867
Mon Nov 05, 2018 1:23 am
Forum: Lewis Structures
Topic: Acids and Bases
Replies: 3
Views: 86

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+).
by 705152867
Mon Nov 05, 2018 1:17 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg and Wavelength
Replies: 11
Views: 534

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.
by 705152867
Tue Oct 30, 2018 5:31 pm
Forum: Administrative Questions and Class Announcements
Topic: Selling textbook?
Replies: 2
Views: 109

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 :)
by 705152867
Tue Oct 30, 2018 5:25 pm
Forum: Resonance Structures
Topic: Resonance hybrids on the test?
Replies: 2
Views: 114

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.
by 705152867
Tue Oct 30, 2018 5:22 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Study Guide
Replies: 1
Views: 115

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.
by 705152867
Tue Oct 23, 2018 12:23 am
Forum: Properties of Electrons
Topic: Nodal surfaces
Replies: 3
Views: 160

Re: Nodal surfaces

Radial nodes are spherical and angular nodes are flat
by 705152867
Tue Oct 23, 2018 12:17 am
Forum: Properties of Light
Topic: SI Units
Replies: 6
Views: 181

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
by 705152867
Tue Oct 23, 2018 12:08 am
Forum: Trends in The Periodic Table
Topic: Properties of metal
Replies: 1
Views: 83

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.
by 705152867
Sun Oct 14, 2018 9:29 pm
Forum: Properties of Electrons
Topic: Diffraction patterns
Replies: 9
Views: 200

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...
by 705152867
Sun Oct 14, 2018 9:16 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework Week 2
Replies: 5
Views: 139

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...
by 705152867
Sun Oct 14, 2018 9:11 pm
Forum: Student Social/Study Group
Topic: Studying techniques
Replies: 12
Views: 275

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...
by 705152867
Tue Oct 09, 2018 10:45 pm
Forum: SI Units, Unit Conversions
Topic: Atoms and Molecules
Replies: 5
Views: 130

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.
by 705152867
Tue Oct 09, 2018 10:43 pm
Forum: SI Units, Unit Conversions
Topic: Ways to remember prefixes
Replies: 7
Views: 762

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.
by 705152867
Tue Oct 09, 2018 10:40 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E.23
Replies: 2
Views: 138

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...
by 705152867
Wed Oct 03, 2018 2:44 pm
Forum: Significant Figures
Topic: Sig Figs when finding Mol
Replies: 4
Views: 202

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 :)
by 705152867
Wed Oct 03, 2018 2:29 pm
Forum: Molarity, Solutions, Dilutions
Topic: mixtures and separation terminology
Replies: 2
Views: 67

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.
by 705152867
Wed Oct 03, 2018 2:18 pm
Forum: Balancing Chemical Reactions
Topic: Example H1, seventh edition.
Replies: 2
Views: 81

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.

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