Search found 35 matches
- Sat Dec 08, 2018 4:58 pm
- Forum: Bond Lengths & Energies
- Topic: Review question
- Replies: 3
- Views: 659
Re: Review question
the answer key says c-o, but the explanation doesn't sound right. It says that since o is the smallest, but both n and c are smaller, so I really don't know.
- Sat Dec 08, 2018 4:07 pm
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
- Replies: 118
- Views: 20168
Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Can someone explain 33b?
- Thu Dec 06, 2018 10:08 pm
- Forum: Bronsted Acids & Bases
- Topic: donating or accepting proton
- Replies: 2
- Views: 320
donating or accepting proton
is donating or accepting proton same as donating and accepting h+?
- Tue Dec 04, 2018 4:32 pm
- Forum: Naming
- Topic: Prefix bis, tris, tetrakis, etc. [ENDORSED]
- Replies: 5
- Views: 723
Re: Prefix bis, tris, tetrakis, etc. [ENDORSED]
Di-, tri-, and tetra- should be used for multiple monodentate ligands while bis-, tris-, tetrakis- would be used for for multiple polydentate ligands. What is a monodentate ligand and what's a polydentate ligand? I don't understand the difference. Monodentate ligands have one e- donor to bind with ...
- Tue Dec 04, 2018 4:24 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Why is water monodentate?
- Replies: 2
- Views: 317
Re: Why is water monodentate?
I found this on a an earlier chemistry community post, here is the link:
viewtopic.php?t=783#p1602
viewtopic.php?t=783#p1602
- Tue Dec 04, 2018 4:19 pm
- Forum: General Science Questions
- Topic: Chemistry Community [ENDORSED]
- Replies: 7
- Views: 788
Chemistry Community [ENDORSED]
Is this the last week of chemistry community questions, or do we have to ask questions during the finals week(even though our final is on a sunday)?
- Wed Nov 28, 2018 7:45 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Square Pyramidal
- Replies: 2
- Views: 324
Square Pyramidal
How do we get the square pyramidal shape?
- Wed Nov 28, 2018 7:44 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz
- Replies: 1
- Views: 266
Quiz
What topics to study for Quiz 3?
- Wed Nov 28, 2018 7:43 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 11
- Views: 1258
Final
Will the final be on everything we've learned since the beginning of the quarter or everything after midterm?
- Mon Nov 19, 2018 7:17 pm
- Forum: Hybridization
- Topic: Unhybridized orbitals
- Replies: 10
- Views: 1340
Re: Unhybridized orbitals
The hybridized and unhybridized bonds also help with the shape. Not the shape of the molecule per se but the shape including the electrons (lone pairs and shared)
- Mon Nov 19, 2018 7:14 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sigma vs. Pi Bonds (What's the difference?)
- Replies: 4
- Views: 334
Re: Sigma vs. Pi Bonds (What's the difference?)
Every bond consists of a sigma bond, but double or triple bonds have one sigma and rest pi bonds
- Mon Nov 19, 2018 6:27 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem 14B
- Replies: 2
- Views: 294
Chem 14B
This quarter, I didn't take any math class - including LS series - (3A, 30A, 32A), and for Chem 14B, they are requisites that are not enforced but has a warning. Can I still take Chem 14B, even though there is a warning, because I heard some people that you can still enroll in the class without the ...
- Thu Nov 15, 2018 10:16 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Single Regions?
- Replies: 8
- Views: 746
Re: Single Regions?
I was looking through the notes and I wrote that single, double, and triple bonds are considered single regions of electron density in VSEPR model, but what does single regions mean in terms of electron density? I think a single region is just a bond (doesn't matter single, double, or triple bond) ...
- Thu Nov 15, 2018 10:13 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Double/Triple Bonds
- Replies: 5
- Views: 971
Double/Triple Bonds
Do double or triple bonds affect the shape or bond angles? I know that they are treated the same electron density, but does the angles change even a little?
- Thu Nov 15, 2018 10:09 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Trigonal Pyramidal
- Replies: 10
- Views: 447
Re: Trigonal Pyramidal
Is it because the electrons are so small (er than atoms), they don't get to be part of the naming? Because I know that only atoms are used in the naming.
- Thu Nov 08, 2018 6:29 pm
- Forum: Resonance Structures
- Topic: Resonance Structures
- Replies: 3
- Views: 482
Re: Resonance Structures
Some molecules or ions cannot be expressed by a single Lewis structure, so we must draw the resonance in order to show the variety and they are all correct.
- Thu Nov 08, 2018 6:25 pm
- Forum: Lewis Structures
- Topic: Radicals 3.55
- Replies: 3
- Views: 344
Re: Radicals 3.55
The two or three examples given in class also included b and c
- Thu Nov 08, 2018 6:23 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Which chapters can we do for homework?
- Replies: 3
- Views: 503
Re: Which chapters can we do for homework?
You should do the second half of Chapter 3, the most of first half was done last week
- Thu Nov 01, 2018 9:11 pm
- Forum: Ionic & Covalent Bonds
- Topic: 6th edition, 3.19b
- Replies: 1
- Views: 78
Re: 6th edition, 3.19b
That is 3.19e but to answer your question, we need to look at Hund's Rule. We need to fill each orbital one by one, so: In d orbital, there are 5 orbitals, so the first 5 electrons go to each orbital, then the remaining 3 goes to the first 3 orbitals. The last two orbitals are left with a single ele...
- Wed Oct 31, 2018 12:16 pm
- Forum: Lewis Structures
- Topic: D orbital
- Replies: 4
- Views: 380
D orbital
What is the maximum number of electrons can an element with a d-orbital hold, since they can hold more than 8
Like Cl, and P
Like Cl, and P
- Mon Oct 29, 2018 10:54 pm
- Forum: DeBroglie Equation
- Topic: Uncertainty
- Replies: 4
- Views: 528
Re: Uncertainty
Heisenberg's Uncertainty Principle was created for very small masses, such as atoms and electrons. For example, in the example he gave us with sensors, the photons thrown changes the direction of an electron, but a photon cannot move you, or a baseball, or a fly.
- Fri Oct 26, 2018 12:35 am
- Forum: Photoelectric Effect
- Topic: HW Question 1.57
- Replies: 4
- Views: 633
Re: HW Question 1.57
Here's my work. What I did makes sense to me but I didn't know where to look for the solution so I don't know for sure that it's right. Hope it helps :)1.57Solution.JPG Hi, I couldn't understand how n2 = 7 I also looked it up online, and they also give n2 = 7 I used n2 = 7 in my homework as well bu...
- Wed Oct 24, 2018 12:23 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Spins
- Replies: 4
- Views: 348
Spins
Can someone explain spin ups and downs? And how they’re represented?
- Wed Oct 24, 2018 12:10 pm
- Forum: Trends in The Periodic Table
- Topic: Helium
- Replies: 2
- Views: 284
Helium
Is Helium in P-block or S-block? It appears on top of P-block with the noble gases, but has the electron configuration 1s2?
- Tue Oct 16, 2018 11:10 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Wavelengths
- Replies: 5
- Views: 338
Re: Wavelengths
Wavelengths are lengths, so if there is a direction given, they could have a negative value but distance-wise no. It is the same for every length.
Example: You can say -10 meters east (10 meters west)
Example: You cannot say I walked -10 meters.
Same goes for wavelengths.
Example: You can say -10 meters east (10 meters west)
Example: You cannot say I walked -10 meters.
Same goes for wavelengths.
- Mon Oct 15, 2018 8:01 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Textbook pages
- Replies: 3
- Views: 342
Re: Textbook pages
I have the 6th edition so all the pages and chapters are based on that.
De Broglie's equation is covered in 1.5 (pages 15-17)
Heisenberg's principle is covered in 1.6 (pages 17-19)
The exercises could be found on pages 25-29
De Broglie's equation is covered in 1.5 (pages 15-17)
Heisenberg's principle is covered in 1.6 (pages 17-19)
The exercises could be found on pages 25-29
- Mon Oct 15, 2018 7:55 pm
- Forum: Properties of Light
- Topic: Lecture
- Replies: 1
- Views: 102
Lecture
Hello, I was wondering if all of his lectures on the same day are the same? I might have to miss my lecture and is it ok if I go to a different one for that day? If it is, could anyone write the lecture times? Thanks
- Thu Oct 11, 2018 7:30 pm
- Forum: Properties of Light
- Topic: Homework for Week 2 [ENDORSED]
- Replies: 3
- Views: 247
Homework for Week 2 [ENDORSED]
Hello, my discussion session is on Friday, and I was wondering if we can turn in questions from Review of Chemical & Physical Principals (the fundamentals chapter), since the questions from The Quantum World are very difficult and there are only 4 questions before we get to the Atomic Spectra Se...
- Tue Oct 09, 2018 7:00 pm
- Forum: Photoelectric Effect
- Topic: post assessment
- Replies: 2
- Views: 214
Re: post assessment
I think larger means higher frequency. Based on what I think, it should be C, but that is just what I think.
- Mon Oct 08, 2018 7:56 pm
- Forum: Properties of Light
- Topic: Wavelength vs Frequency
- Replies: 7
- Views: 571
Re: Wavelength vs Frequency
I know that frequency and intensity are different but that's not the question. A wave has a frequency (time needed) and a wavelength, so they are related to each other; The distance between peaks of a wave is its wavelength. Frequency (unit = hertz) is the number of waves that pass in a given time. ...
- Mon Oct 08, 2018 7:37 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Periodic Table
- Replies: 6
- Views: 499
Re: Periodic Table
I know that in the tests, they are given to us, but will periodic tables be provided in the Mid-Term or the Final? Sorry to answer your question with another one.
- Wed Oct 03, 2018 8:52 pm
- Forum: SI Units, Unit Conversions
- Topic: Homework Questions [ENDORSED]
- Replies: 14
- Views: 1147
Homework Questions [ENDORSED]
I know that the homework is just 7 questions of our choice but I was wondering if we have to answer a question from every topic. For example, this week, there is E, F, G, H, L, and M, so do we have to do one from each or can I turn in all 7 from E.
- Wed Oct 03, 2018 8:41 pm
- Forum: SI Units, Unit Conversions
- Topic: Naming Compounds
- Replies: 9
- Views: 799
Re: Naming Compounds
Can someone explain how to write the formula of compounds. For example, in question E9 it asks you to write the formula for magnesium sulfate heptahydrate. You need to know the basic formulas. Some names give you clues such as ending with -ate or -ite means there is oxygen in the compound. There are...
- Wed Oct 03, 2018 8:23 pm
- Forum: General Science Questions
- Topic: Turning in Homework
- Replies: 4
- Views: 468
Re: Turning in Homework
The homework is just seven questions, but I still did most of them on my notebook, then chose the 7 that is correct for sure and write it on a separate sheet of paper. I think that helps me because I go and look over the questions I did, which is a great practice. But you don't need to do all the qu...
- Mon Oct 01, 2018 10:01 pm
- Forum: General Science Questions
- Topic: Periodic Table
- Replies: 16
- Views: 1558
Re: Periodic Table
Usually, the question or the previous questions should give you an idea of how much you should round. When I round, I look at the previous questions and if they rounded to the nearest hundredth than I round to the nearest hundredth. If they do it to the thousandth than I do it to the thousandth, and...