CHEMISTRY COMMUNITY

Elizabeth Parker 1K

You just pick one of the N's and do the VSEPR for that molecule because it would be the same and they are both central. This video helps. https://www.youtube.com/watch?v=beA1lEDKSlQ

Elizabeth Parker 1K

Yeah do the Lewis structure first and then write out the VSEPR formula to help with the shape. The easiest way to get it is to just create a chart with all of the VSEPR formulas and shapes and commit it to memory so when you get a formula you know what shape. But you should be able to infer from the...

Elizabeth Parker 1K

Yeah for the VSEPR model the best way is just to memorize the shapes and know the difference between the ones with lone pairs and how that changes the angle and subsequently the shape. Make a chart with all of the VSEPR formulas and the shapes and angles and that should help.

Elizabeth Parker 1K

Hybridization is the concept that orbitals fuse to make new hybridized orbitals. This table might help. But you can use the VSEPR to get the hybridized formula.

Elizabeth Parker 1K

I was told that angular is for one lone pair and bent is for two lone pairs because it is closer together. Is that not true?

Elizabeth Parker 1K

You draw the Lewis structure still!

Elizabeth Parker 1K

What other things do we just need to know conceptually?

Elizabeth Parker 1K

Can someone please explain delocalization?

Elizabeth Parker 1K

This video had a couple of examples that helped me.
https://www.youtube.com/watch?v=96L6_IwyHRM

Elizabeth Parker 1K

Would we need to show every step on the test or just the final molecule with the lowest formal charge?

Elizabeth Parker 1K

Going off of that, when do we know to give a double bond and a lone pair versus a triple bond?

Elizabeth Parker 1K

I'm not sure if it will be provided but I would memorize it just in case. Formal charge = [# of valence electrons] – [electrons in lone pairs + 1/2 the number of bonding electrons]

Elizabeth Parker 1K

It doesn't matter right now because it just makes resonance structures. But I think it might change things for three dimensional forms.

Elizabeth Parker 1K

Do we always need to find formal charge?

Elizabeth Parker 1K

This site was really helpful for me in making it clear when to recognize an exception. https://chem.libretexts.org/Core/Physic ... Octet_Rule

Elizabeth Parker 1K

Yea I'm not sure how you could match those up, but I could send you the pdf of the sixth edition if you want, that way you can study the same thing. Just send your email!

Elizabeth Parker 1K

Hi! I asked this same question and I was told that you have to ask in office hours with your TA because there were so many versions of the tests.

Elizabeth Parker 1K

Was there ever a key posted for test #1? Or does anyone know where I could find the solutions?

Elizabeth Parker 1K

Yeah it will never be more than two electrons in a single orbital, it will just start to fill another.

Elizabeth Parker 1K

If an electron absorbs energy from a photon, it could get excited and move up to a higher energy shell. If an electron drops down to a lower energy shell it loses energy. So if an electron is moving up to a higher subshell then it is absorbing/gaining energy.

Elizabeth Parker 1K

Hi! Someone answered this question really well. Just search "2.1" in the chemistry community search. It was really detailed and he linked a video that was also helpful.

Elizabeth Parker 1K

Yeah there are so many variances when it comes to equations. I think if you know how to derive them you should be okay. But a sheet would be helpful!

Elizabeth Parker 1K

Quanta are just the small packets of energy. They are the discrete packets that Lavelle talked about in class.

Elizabeth Parker 1K

Yes, technically both are determining wave length. The De Broglie wavelength just relates wavelength to speed.

Elizabeth Parker 1K

Constructive interference is waves in phase and they have the same sign for amplitude and thus when the waves meet they line up at the crests and create a wave with higher amplitude. Destructive interference is waves out of phase and the crest of one wave meets the trough of another, essentially dis...

Elizabeth Parker 1K

Hi! You don't necessarily need to know the exact lengths, just the order of which have higher energy and lower energy and the differences between them in terms of properties.

Elizabeth Parker 1K

Discrete just means that there is a finite number as opposed to a continuous amount. In regards to chemistry, we describe energy as being transferred in discrete units or packets.

Elizabeth Parker 1K

Frequency is how many waves pass by in a second while wavelength is the distance between two crests. Amplitude is related to how much energy a wave has. High energy waves have high amplitude and low energy waves have low amplitude.

Elizabeth Parker 1K

Hi! Plancks constant describes the behavior of particles and waves on an atomic scale. This makes it easier to describe the discrete units of energy and links frequency with total energy.

Elizabeth Parker 1K

Yea I’m down too! Let me know when the groupme is set up please!

Elizabeth Parker 1K

Hi! So this question is a determining solute concentration, so you will start by using the equation M(initial)*V(initial) = M(final)*V(final). With the measurements that you are given, plug in the values and then use systems of equations to get the mass of silver nitrate.

Elizabeth Parker 1K

Yea just think of it as being a simple algebraic problem. You distribute and then you can continue the problem.

Elizabeth Parker 1K

Hi! For this problem you convert the percentages to grams and then divide by the mass of each element. For example 5.19 g H * 1 mol H/1.008 g H.

CHEMISTRY COMMUNITY

Search found 33 matches

Re: VSEPR formula with 2 central atoms

Re: Molecular shape

Re: Naming Structures

Re: hybridization

Re: Bent vs. Angular

Re: 4.3 Structure and Shape [ENDORSED]

Re: Dissociation Energy

Re: Resonance

Re: Confusion on exceptions to the octet rule

Re: Reducing formal charge number

Re: Double Bond vs Triple Bond

Re: Formula Provided

Re: Drawing Lewis Structures

Re: Formal Charge: Lewis dot structures

Re: Exceptions [ENDORSED]

Re: Issues with 7th Edition Textbook

Re: test 2 solutions

Key for Test #1

Re: # of electrons for a given orbital (homework 2.25)

Re: HW Problem 2.2 [ENDORSED]

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Re: Application of different formulas [ENDORSED]

Re: Quanta

Re: Wavelength and De Broglie Equation [ENDORSED]

Re: Wave properties of electrons

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Re: wave length

Re: plancks constant

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