Search found 34 matches
- Sun Dec 09, 2018 11:55 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: tetrahedral or square planar?
- Replies: 5
- Views: 841
Re: tetrahedral or square planar?
I don't think we are responsible for that distinction, at least for this class! 14B tho...
- Sun Dec 09, 2018 11:54 pm
- Forum: Biological Examples
- Topic: Cisplatin
- Replies: 4
- Views: 722
Re: Cisplatin
Its because of the way the chlorines are oriented! They are able to bind to two relatively close guanines on DNA and bind at TWO sites, which blocks dna replication mechanisms. Transplatin isn't able to complex twice and so the one bond it makes is not enough to block replication
- Sun Dec 09, 2018 11:52 pm
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
- Replies: 135
- Views: 37537
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Thank you so much for everything!! These worksheets were a life saver
- Sun Dec 02, 2018 11:32 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentate
- Replies: 2
- Views: 293
Re: Polydentate
Yeah I'm also confused about this...
- Sun Dec 02, 2018 11:31 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Calculating
- Replies: 2
- Views: 299
Re: Calculating
I think we'll be covering that next class! My TA said in OH that its a detailed calculation but we'll do it step by step and it's more or less straight forward.
- Sun Dec 02, 2018 11:30 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligands
- Replies: 2
- Views: 297
Re: Ligands
Im not positive but I think we would have to either have a picture or be told.
- Sun Dec 02, 2018 11:29 pm
- Forum: Biological Examples
- Topic: Cisplatin Example
- Replies: 5
- Views: 595
Re: Cisplatin Example
Yeah, like people are saying, one bond with DNA is not enough to block the DNA replication machinery. If its a trans molecule, there would only be one bond available to be made. In a cis molecule, two bonds are available to be made, and so those two bonds are what is necessary to disrupt DNA replica...
- Sun Nov 25, 2018 11:05 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Covalent Character
- Replies: 1
- Views: 230
Re: Covalent Character
So covalent character is between atoms closer together on the table (that are most willing to SHARE their electron), whereas ionic character is between elements further apart (that are more willing to entirely donate their electrons). Between O and S, which are in the same group, but different perio...
- Sun Nov 25, 2018 11:01 pm
- Forum: Hybridization
- Topic: pi bonds and rotation
- Replies: 3
- Views: 448
Re: pi bonds and rotation
Yeah, so pi bonds don't allow any rotation at all. An easy way to visualize this is to think of how sigma bonds are arranged tip to tip, so theres only one area of overlap between them (so they can rotate) but pi bonds are arranged side to side, so there are two areas of overlap between them. If a p...
- Sun Nov 25, 2018 10:59 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Unhybridized P orbital
- Replies: 2
- Views: 194
Re: Unhybridized P orbital
Yes, to the best of my understanding, this unhybridized p orbital does contain electrons, they're just not involved in the hybridization bonding. They're the ones that are involved in double and triple bonding!
- Sun Nov 18, 2018 12:11 am
- Forum: General Science Questions
- Topic: Exciting Chemistry News!
- Replies: 2
- Views: 514
Re: Exciting Chemistry News!
So interesting! Thanks
- Sun Nov 18, 2018 12:10 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 3
- Views: 468
Re: Bond Angles
Well I think one of the main things is that one involves only 3 atoms, whereas the other involves 4. So the overall molecular shape will be different because of the 3 bonding pairs vs 4 bonding pairs
- Sun Nov 18, 2018 12:08 am
- Forum: Student Social/Study Group
- Topic: Sick the last 2 weeks and need lecture notes
- Replies: 1
- Views: 306
Re: Sick the last 2 weeks and need lecture notes
Yeah for sure! My email is avagordon93@gmail.com
- Fri Nov 16, 2018 3:23 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Tetrahedral shape
- Replies: 5
- Views: 413
Re: Tetrahedral shape
Distortion in a tetrahedral molecule can also be due to the size of the atoms involved in the bonding interactions. If all of the surrounding atoms are the same element, then the bond angles will all be the same because the bonded atoms will all have the same atomic radius. If they're different, the...
- Fri Nov 16, 2018 3:11 pm
- Forum: Student Social/Study Group
- Topic: Study Group
- Replies: 1
- Views: 267
Re: Study Group
I'd be very interested!
- Sun Nov 11, 2018 11:59 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Why do the orbitals of an atom only hold a certain amount of electrons?
- Replies: 7
- Views: 972
Re: Why do the orbitals of an atom only hold a certain amount of electrons?
I think it's related to their shape
- Fri Nov 02, 2018 8:15 pm
- Forum: DeBroglie Equation
- Topic: De Broglie Equation
- Replies: 2
- Views: 581
Re: De Broglie Equation
De Broglie basically was saying that all objects in our world have a wavelength, but that the more massive the object, the smaller the wavelength. Essentially we can only observe the wavelengths of an object when it's tiny enough (ie an electron or atom). So when we're talking about a baseball and w...
- Fri Nov 02, 2018 7:47 pm
- Forum: Trends in The Periodic Table
- Topic: Will we need to calculate the effective nuclear charge for the midterm?
- Replies: 1
- Views: 230
Re: Will we need to calculate the effective nuclear charge for the midterm?
I went to dr. lavelle's OH to ask him about that a week or so ago and he mentioned that it was more a conceptual thing we need to know, in terms of shielding etc, but tbh for the midterm I'm not sure. Don't want to give u a wrong answer.
- Fri Nov 02, 2018 7:45 pm
- Forum: Photoelectric Effect
- Topic: Chem Test 2, #5 b
- Replies: 4
- Views: 595
Re: Chem Test 2, #5 b
I had a differently worded question but I also think what they're asking for in your case was for you to say that energy levels are quantized in the atom. Meaning that the energy (and therefore frequency) of light that is emitted corresponds to the specific amounts of energy necessary to move an ato...
- Thu Oct 25, 2018 12:24 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Question about H electron configuration
- Replies: 3
- Views: 462
Re: Question about H electron configuration
I am also confused about this. When the single electron in an H atom is excited up to, say, 5p, does it just bypass all the intermediate shells and subshells? Does it drop immediately down? Can it exist in that excited state for long? I'm just not sure I'm conceptualizing this properly...
- Thu Oct 25, 2018 12:19 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Bohr Frequency Condition
- Replies: 1
- Views: 272
Re: Bohr Frequency Condition
Basically, Bohr frequency says that the frequency of the light emitted from any substance (visualized as a line on an emission spectroscopy) is directly related to the change in energy that it was responsible for enacting (ie a jump from n=2 --> n=1). So: frequency of emitted light = (deltaE)/planck...
- Thu Oct 25, 2018 12:15 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Everyday objects and Heisenberg's uncertainty
- Replies: 3
- Views: 1583
Re: Everyday objects and Heisenberg's uncertainty
Wasn't the whole thing about Heisenberg Indeterminacy the fact that at such a small level (the atomic level) our tools of measurement for position and momentum are not effective enough to not influence the measurements they take? Because I remember the professor (or maybe my TA) mentioning that its ...
- Wed Oct 24, 2018 8:58 pm
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
- Replies: 135
- Views: 37537
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
I'm a little confused on #7 in the Quantum World Part 1 worksheet. I just can't seem to come up with (1/ni)=0.0278 and I'm not sure why. Could someone explain it to me possibly? I follow her formulas and rationale, I'm just not getting the right numbers...
- Fri Oct 19, 2018 7:32 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Uncertainty in the velocity
- Replies: 1
- Views: 193
Re: Uncertainty in the velocity
I think I remember this... Do you mean the delta V answer we got from the problem we did in class? Because if so, that was a sample problem he did to show us that electrons could not be confined to the diameter of the nucleus. They have to exist outside of it. Because if we set our delta X value to ...
- Fri Oct 19, 2018 7:25 pm
- Forum: Properties of Light
- Topic: Wave-Particle Duality [ENDORSED]
- Replies: 1
- Views: 188
Re: Wave-Particle Duality [ENDORSED]
The photoelectric effect is the experiment that shows that light has particle qualities. They noticed that whether or not an electron was ejected from a metal had to do with the frequency of the light that was shone on it, not the intensity of that light. This showed that light was made of photons b...
- Fri Oct 19, 2018 7:17 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electrostatic Attraction
- Replies: 5
- Views: 4828
Re: Electrostatic Attraction
From what I understand that's just the attraction between positive and negatively charged things.
- Wed Oct 10, 2018 12:45 am
- Forum: Significant Figures
- Topic: Calculators
- Replies: 20
- Views: 1691
Re: Calculators
Honestly not sure... Maybe email your TA? They're probably not going to provide calculators, so if they say you can't use yours that would be awful. Definitely borrow one to be safe.
- Wed Oct 10, 2018 12:40 am
- Forum: Significant Figures
- Topic: Calculators
- Replies: 20
- Views: 1691
Re: Calculators
You'll need to buy a scientific calculator for the midterm and final, I believe. On the syllabus it says that "only non-programmable, non-graphing calculators are allowed".
- Wed Oct 10, 2018 12:33 am
- Forum: Balancing Chemical Reactions
- Topic: Chemical compounds
- Replies: 3
- Views: 415
Re: Chemical compounds
I also was wondering this. My TA said that we would not be expected to translate from written word --> formula but several UAs have said otherwise.
- Wed Oct 10, 2018 12:24 am
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Periodic Table
- Replies: 3
- Views: 326
Re: Periodic Table
Hi! So I had the same question and my TA (Anton) said that whenever doing calculations using molar masses, it's best to uses the entire number, including all of the decimals listed. He said it's because depending on what calculations you're doing, it may impact your final answer, and you'll never be...
- Fri Oct 05, 2018 12:27 pm
- Forum: SI Units, Unit Conversions
- Topic: How does grading for discussion posts work?
- Replies: 80
- Views: 7647
Re: How does grading for discussion posts work?
Does anyone know when (if?) the audio-visual focus topics are due? I switched into this class a few days ago and I'm a little confused. Thank you!!
- Fri Oct 05, 2018 12:12 pm
- Forum: Significant Figures
- Topic: Zeros in sig figs
- Replies: 4
- Views: 550
Re: Zeros in sig figs
If you'd like, Dr. Lavelle also put up a great resource that explains how to use Sig Figs. It's super comprehensive and it walks you through all the rules (even the weird ones, like the ones about zeros) kind of painlessly! I'll link it below! There is also another one that is more of a formula shee...
- Fri Oct 05, 2018 12:05 pm
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 347
- Views: 410631
Re: Rusty on High School Chem [ENDORSED]
Not sure if anyone else has mentioned this but I've found that studying in groups is really a great way to get a better grasp on the material. Not only will you feel less alone while you're grappling with the new material, but its also an objective fact that teaching a concept to someone is the best...
- Fri Oct 05, 2018 11:55 am
- Forum: Empirical & Molecular Formulas
- Topic: When finding empirical formula
- Replies: 4
- Views: 455
Re: When finding empirical formula
I believe so, yes! You need to calculate mass percentage composition and get a percentage for every element involved, because that is the crucial information you need to do the rest of the problem. Once you have that, you can proceed with solving the rest (by assuming you have 100 g of the compound,...