Search found 33 matches

by Elizabeth Parker 1K
Sun Jun 03, 2018 4:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR formula with 2 central atoms
Replies: 2
Views: 103

Re: VSEPR formula with 2 central atoms

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
by Elizabeth Parker 1K
Sun Jun 03, 2018 4:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular shape
Replies: 3
Views: 121

Re: Molecular shape

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...
by Elizabeth Parker 1K
Sun Jun 03, 2018 4:44 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Naming Structures
Replies: 8
Views: 226

Re: Naming Structures

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.
by Elizabeth Parker 1K
Fri Jun 01, 2018 10:28 am
Forum: Hybridization
Topic: hybridization
Replies: 2
Views: 114

Re: hybridization

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.
by Elizabeth Parker 1K
Fri Jun 01, 2018 10:21 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent vs. Angular
Replies: 11
Views: 318

Re: Bent vs. Angular

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?
by Elizabeth Parker 1K
Fri Jun 01, 2018 10:20 am
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.3 Structure and Shape [ENDORSED]
Replies: 4
Views: 103

Re: 4.3 Structure and Shape [ENDORSED]

You draw the Lewis structure still!
by Elizabeth Parker 1K
Thu May 24, 2018 5:34 pm
Forum: Bond Lengths & Energies
Topic: Dissociation Energy
Replies: 3
Views: 183

Re: Dissociation Energy

What other things do we just need to know conceptually?
by Elizabeth Parker 1K
Thu May 24, 2018 5:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Resonance
Replies: 7
Views: 238

Re: Resonance

Can someone please explain delocalization?
by Elizabeth Parker 1K
Thu May 24, 2018 5:24 pm
Forum: Octet Exceptions
Topic: Confusion on exceptions to the octet rule
Replies: 2
Views: 186

Re: Confusion on exceptions to the octet rule

This video had a couple of examples that helped me.
https://www.youtube.com/watch?v=96L6_IwyHRM
by Elizabeth Parker 1K
Wed May 16, 2018 2:12 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Reducing formal charge number
Replies: 3
Views: 136

Re: Reducing formal charge number

Would we need to show every step on the test or just the final molecule with the lowest formal charge?
by Elizabeth Parker 1K
Wed May 16, 2018 2:09 pm
Forum: Bond Lengths & Energies
Topic: Double Bond vs Triple Bond
Replies: 7
Views: 603

Re: Double Bond vs Triple Bond

Going off of that, when do we know to give a double bond and a lone pair versus a triple bond?
by Elizabeth Parker 1K
Wed May 16, 2018 2:06 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formula Provided
Replies: 6
Views: 246

Re: Formula Provided

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]
by Elizabeth Parker 1K
Fri May 11, 2018 12:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Drawing Lewis Structures
Replies: 5
Views: 216

Re: Drawing Lewis Structures

It doesn't matter right now because it just makes resonance structures. But I think it might change things for three dimensional forms.
by Elizabeth Parker 1K
Fri May 11, 2018 12:34 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge: Lewis dot structures
Replies: 6
Views: 214

Re: Formal Charge: Lewis dot structures

Do we always need to find formal charge?
by Elizabeth Parker 1K
Fri May 11, 2018 12:33 pm
Forum: Octet Exceptions
Topic: Exceptions [ENDORSED]
Replies: 7
Views: 395

Re: Exceptions [ENDORSED]

This site was really helpful for me in making it clear when to recognize an exception. https://chem.libretexts.org/Core/Physic ... Octet_Rule
by Elizabeth Parker 1K
Fri May 04, 2018 1:31 pm
Forum: Trends in The Periodic Table
Topic: Issues with 7th Edition Textbook
Replies: 3
Views: 117

Re: Issues with 7th Edition Textbook

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!
by Elizabeth Parker 1K
Fri May 04, 2018 1:27 pm
Forum: Properties of Light
Topic: test 2 solutions
Replies: 2
Views: 145

Re: test 2 solutions

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.
by Elizabeth Parker 1K
Tue May 01, 2018 7:44 pm
Forum: Molarity, Solutions, Dilutions
Topic: Key for Test #1
Replies: 4
Views: 203

Key for Test #1

Was there ever a key posted for test #1? Or does anyone know where I could find the solutions?
by Elizabeth Parker 1K
Sun Apr 29, 2018 5:43 pm
Forum: Quantum Numbers and The H-Atom
Topic: # of electrons for a given orbital (homework 2.25)
Replies: 3
Views: 103

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

Yeah it will never be more than two electrons in a single orbital, it will just start to fill another.
by Elizabeth Parker 1K
Sun Apr 29, 2018 5:27 pm
Forum: Quantum Numbers and The H-Atom
Topic: HW Problem 2.2 [ENDORSED]
Replies: 3
Views: 108

Re: HW Problem 2.2 [ENDORSED]

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.
by Elizabeth Parker 1K
Sun Apr 29, 2018 5:23 pm
Forum: DeBroglie Equation
Topic: homework problems [ENDORSED]
Replies: 5
Views: 214

Re: homework problems [ENDORSED]

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.
by Elizabeth Parker 1K
Sun Apr 22, 2018 11:19 pm
Forum: Photoelectric Effect
Topic: Application of different formulas [ENDORSED]
Replies: 4
Views: 129

Re: Application of different formulas [ENDORSED]

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!
by Elizabeth Parker 1K
Sun Apr 22, 2018 11:14 pm
Forum: DeBroglie Equation
Topic: Quanta
Replies: 5
Views: 213

Re: Quanta

Quanta are just the small packets of energy. They are the discrete packets that Lavelle talked about in class.
by Elizabeth Parker 1K
Fri Apr 20, 2018 6:37 pm
Forum: DeBroglie Equation
Topic: Wavelength and De Broglie Equation [ENDORSED]
Replies: 9
Views: 270

Re: Wavelength and De Broglie Equation [ENDORSED]

Yes, technically both are determining wave length. The De Broglie wavelength just relates wavelength to speed.
by Elizabeth Parker 1K
Fri Apr 20, 2018 1:14 pm
Forum: Photoelectric Effect
Topic: Wave properties of electrons
Replies: 2
Views: 74

Re: Wave properties of electrons

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...
by Elizabeth Parker 1K
Fri Apr 20, 2018 1:01 pm
Forum: Properties of Light
Topic: Wavelengths
Replies: 8
Views: 226

Re: Wavelengths

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.
by Elizabeth Parker 1K
Mon Apr 16, 2018 12:51 am
Forum: Photoelectric Effect
Topic: "Discrete" units [ENDORSED]
Replies: 2
Views: 86

Re: "Discrete" units [ENDORSED]

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.
by Elizabeth Parker 1K
Mon Apr 16, 2018 12:46 am
Forum: Properties of Light
Topic: wave length
Replies: 5
Views: 103

Re: wave length

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.
by Elizabeth Parker 1K
Mon Apr 16, 2018 12:42 am
Forum: Properties of Light
Topic: plancks constant
Replies: 2
Views: 61

Re: plancks constant

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.
by Elizabeth Parker 1K
Mon Apr 16, 2018 12:35 am
Forum: Student Social/Study Group
Topic: Study Group
Replies: 8
Views: 392

Re: Study Group

Yea I’m down too! Let me know when the groupme is set up please!
by Elizabeth Parker 1K
Fri Apr 06, 2018 11:19 am
Forum: Molarity, Solutions, Dilutions
Topic: G. 9 [ENDORSED]
Replies: 2
Views: 120

Re: G. 9 [ENDORSED]

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.
by Elizabeth Parker 1K
Fri Apr 06, 2018 11:15 am
Forum: Balancing Chemical Reactions
Topic: H.5.b [ENDORSED]
Replies: 7
Views: 250

Re: H.5.b [ENDORSED]

Yea just think of it as being a simple algebraic problem. You distribute and then you can continue the problem.
by Elizabeth Parker 1K
Fri Apr 06, 2018 9:36 am
Forum: Molarity, Solutions, Dilutions
Topic: F19
Replies: 3
Views: 189

Re: F19

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.

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