Search found 11 matches

by Janelle Magaling 3L
Wed Nov 21, 2018 11:09 am
Forum: Hybridization
Topic: Electron Density vs Shape?
Replies: 6
Views: 123

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 ...
by Janelle Magaling 3L
Fri Nov 16, 2018 2:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Linear Example
Replies: 4
Views: 86

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.
by Janelle Magaling 3L
Fri Nov 16, 2018 2:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 4
Views: 96

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.
by Janelle Magaling 3L
Fri Nov 16, 2018 2:34 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs in Molecular Shape
Replies: 4
Views: 104

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.
by Janelle Magaling 3L
Wed Oct 31, 2018 3:46 pm
Forum: Octet Exceptions
Topic: Valence Electrons for Exceptions to Octets
Replies: 2
Views: 100

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?
by Janelle Magaling 3L
Tue Oct 23, 2018 6:08 pm
Forum: Properties of Electrons
Topic: Speed of an Electron (hw 1.43)
Replies: 5
Views: 2113

Re: Speed of an Electron (hw 1.43)

What would be the mass for delta p = mass * delta v??
by Janelle Magaling 3L
Mon Oct 22, 2018 8:28 pm
Forum: DeBroglie Equation
Topic: HW Help 1.25
Replies: 4
Views: 163

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...
by Janelle Magaling 3L
Thu Oct 11, 2018 9:27 pm
Forum: Administrative Questions and Class Announcements
Topic: Tutoring? [ENDORSED]
Replies: 61
Views: 53628

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!
by Janelle Magaling 3L
Thu Oct 11, 2018 9:24 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 127
Views: 74975

Re: Reading the textbook [ENDORSED]

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...
by Janelle Magaling 3L
Thu Oct 11, 2018 9:21 pm
Forum: Significant Figures
Topic: Rounding Using Significant Figures
Replies: 10
Views: 534

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...
by Janelle Magaling 3L
Sun Oct 07, 2018 8:55 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 166
Views: 100759

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...

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