Search found 11 matches
- Wed Nov 21, 2018 11:09 am
- Forum: Hybridization
- Topic: Electron Density vs Shape?
- Replies: 6
- Views: 715
Re: Electron Density vs Shape?
Electron density is about the forces of the bonding and lone pairs and how they repel each other. Electron density determines the shape. There atomic structure tells us the shape of the electron densities, but the molecular shape, which is what we mainly focus on, is the structure of just the atoms ...
- Fri Nov 16, 2018 2:42 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Linear Example
- Replies: 4
- Views: 555
Re: Linear Example
Be doesn't have lone pair electrons because it is an exception to the octet rule so it cannot take anymore valence electrons. Plus Cl-Be-Cl with three lone pairs around each Cl is already balanced.
- Fri Nov 16, 2018 2:36 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 4
- Views: 516
Re: Bond Angles
You would have to search up the exact degree of the angle since it is very particular. I believe for the test you would not need to know the exact angle, just that it is less than the typical given angle degree in an all atom structure.
- Fri Nov 16, 2018 2:34 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pairs in Molecular Shape
- Replies: 4
- Views: 514
Re: Lone Pairs in Molecular Shape
Yes, lone pairs repel other atoms. However they do have different repelling force than other atoms, so the bond angles of the other atoms are smaller than if the lone pair were just another atom.
- Wed Oct 31, 2018 3:46 pm
- Forum: Octet Exceptions
- Topic: Valence Electrons for Exceptions to Octets
- Replies: 2
- Views: 441
Valence Electrons for Exceptions to Octets
In lecture today Prof Lavelle used BF3 as an example for an exception to the octet guideline. How did he reach that conclusion that there are only 6 valence electrons in BF3?
- Tue Oct 23, 2018 6:08 pm
- Forum: Properties of Electrons
- Topic: Speed of an Electron (hw 1.43)
- Replies: 8
- Views: 4572
Re: Speed of an Electron (hw 1.43)
What would be the mass for delta p = mass * delta v??
- Mon Oct 22, 2018 8:28 pm
- Forum: DeBroglie Equation
- Topic: HW Help 1.25
- Replies: 4
- Views: 562
HW Help 1.25
Hi can someone help me with this question? Sodium vapor lamps, used for public lighting, emit yellow light of wavelength 589 nm. How much energy is emitted by (b) 5.00 mg of sodium atoms emitting light at this wavelength I solved (a) already, but got stuck on (b). What equation should I use consider...
- Thu Oct 11, 2018 9:27 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Tutoring? [ENDORSED]
- Replies: 121
- Views: 265262
Re: Tutoring? [ENDORSED]
There a lot of office hours, lots of workshops, and step ups! If anything it is also helpful to find a study group to help each other out!
- Thu Oct 11, 2018 9:24 pm
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 150643
Re: Reading the textbook
I think it's helpful reading the textbook for example problems. Usually I would go over my notes from lecture and watch the modules and take notes. The textbook is really helpful for homework help because the textbook gives step by step answers to different types of homework problems. Basically focu...
- Thu Oct 11, 2018 9:21 pm
- Forum: Significant Figures
- Topic: Rounding Using Significant Figures
- Replies: 10
- Views: 1538
Re: Rounding Using Significant Figures
Hi Caitlin! I heard from my TA that it is best to use all the digits while doing the problem to ensure the most accurate answer and then round the final answer at the end. And you round to the least number of sig figs in the given digits. For example, for 2.55 x 3.5 the answer would be 8.9 and not 8...
- Sun Oct 07, 2018 8:55 pm
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 347
- Views: 435338
Re: Rusty on High School Chem [ENDORSED]
I am also super rusty in chemistry! The last I took chem was my sophomore year of high school and even then it wasn’t my best subject. However I’ve been feeling better about chemistry because Prof Lavelle has given us so many resources! There’s his modules which are practice problems and videos of h...