Search found 20 matches

by Jessica Schirmer 1J
Fri Dec 08, 2017 9:32 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Electron Withdrawing Power
Replies: 3
Views: 153

Re: Electron Withdrawing Power

Can someone explain how e- withdrawing power relates to oxyacids? I don't understand what the notes meant by "e- withdrawing tons delocalize and stabilize the negative charge"
by Jessica Schirmer 1J
Fri Dec 08, 2017 9:26 am
Forum: Bronsted Acids & Bases
Topic: % dissociation
Replies: 3
Views: 229

Re: % dissociation

Its how "far" the acid dissociated into its ions. (For example: a strong acid dissociates completely, or 100%, into its ions).
You calculate this by: [H3O+]/initial concentration of acid x 100
by Jessica Schirmer 1J
Fri Dec 01, 2017 9:55 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: drawing coordination compounds
Replies: 5
Views: 235

Re: drawing coordination compounds

I believe the most important part of drawing a coordination compound is known what is the central atom and what the various ligands are. This is the concept that was most stressed in lecture.
by Jessica Schirmer 1J
Fri Dec 01, 2017 9:51 am
Forum: Biological Examples
Topic: Memorization of compounds
Replies: 5
Views: 386

Re: Memorization of compounds

Yes! I believe we will need to know the charge of most ligands, at least many of the simple ones.
by Jessica Schirmer 1J
Sun Nov 26, 2017 11:17 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: structure of chelate
Replies: 2
Views: 167

Re: structure of chelate

From the brief research I did to answer your question I believe so. The formation of rings is also called “chelation.”
by Jessica Schirmer 1J
Sun Nov 26, 2017 11:11 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Reaction constant
Replies: 4
Views: 291

Re: Reaction constant

I believe they will always specify because we would need to be given other values in order to solve for Kp or Kc. However I think it is more common to have Kc in a problem.
by Jessica Schirmer 1J
Sun Nov 19, 2017 5:47 pm
Forum: Hybridization
Topic: 3 regions of e- density
Replies: 3
Views: 213

Re: 3 regions of e- density

If there are 3 regions of e- density, then the hybridized orbitals would be sp^2. The coefficient in front of the type of orbital, the "4" in your problem, describes the energy level in which they fall into. For example, methane (CH4) has four regions of e- density, therefore has hybrid or...
by Jessica Schirmer 1J
Sun Nov 19, 2017 5:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 4
Views: 205

Re: Lone Pairs

Lone pairs change the bond angles because they can repel the e- in the bonds more than another bonded pair.
by Jessica Schirmer 1J
Sun Nov 12, 2017 1:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Radicals and bond angles
Replies: 1
Views: 114

Re: Radicals and bond angles

I would assume that the bond angle would be less then the given degree of 109.5 due to e- repulsion, but not as significant as if there was a complete lone pair because there are less e- in total.
by Jessica Schirmer 1J
Sun Nov 12, 2017 1:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angles for molecules with lone pairs
Replies: 1
Views: 98

Re: Bond angles for molecules with lone pairs

No! I believe in lecture Dr. Lavelle stated that we only need to know that they are less then the 109 degree bond angle if there were no lone pairs.
by Jessica Schirmer 1J
Fri Nov 03, 2017 8:58 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: d orbital or s orbital first?
Replies: 5
Views: 268

Re: d orbital or s orbital first?

4s is lower in energy until there are e- in the 3d orbital (that's why you fill 4s first). Once there are e- in the 3d orbita,l the 4s orbital becomes higher in energy. What helped me understand this is the fact that once there are e- in the 3d orbital they provide "shielding" for the e- i...
by Jessica Schirmer 1J
Fri Nov 03, 2017 8:54 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: shielding effect of s and p-orbitals
Replies: 4
Views: 247

Re: shielding effect of s and p-orbitals

An e- in a s-orbital can penetrate the nucleus because according to Schrodinger's wave equation, the 3D shape/probability of the s-orbital has no nodes (probability never reaches zero).
by Jessica Schirmer 1J
Sun Oct 29, 2017 9:48 pm
Forum: Lewis Structures
Topic: Placement [ENDORSED]
Replies: 6
Views: 235

Re: Placement [ENDORSED]

There are usually patterns with finding the central atom as well. I noticed that the more problems I completed that I found many similarities between different molecules.
by Jessica Schirmer 1J
Sun Oct 29, 2017 9:37 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 4s and 3d orbitals
Replies: 5
Views: 370

Re: 4s and 3d orbitals

Due to the 4s orbital being filled first, is it important to write the electron configurations like 4s^2 3d^4 for example? Or can it be written as 3d^4 4s^2
by Jessica Schirmer 1J
Sun Oct 22, 2017 6:15 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2.43 (a) Silver
Replies: 4
Views: 223

Re: 2.43 (a) Silver

I believe that the reason Silver is [Kr]4d^10 5s^1 is the same reason why Copper is an exception. The atom is more stable if the d orbital is completely full rather than partially full. Therefore one e- from the 5s orbital is "moved" into the 4d orbital.
by Jessica Schirmer 1J
Sun Oct 22, 2017 6:11 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Chromium and Copper Electron Configuration Exceptions [ENDORSED]
Replies: 5
Views: 465

Re: Chromium and Copper Electron Configuration Exceptions [ENDORSED]

The atoms are more stable when the d orbital is either half filled or completely filled versus partially filled, therefore one e- from the 4s orbital is "moved" into the 3d orbital in both cases. I believe the only way to know these exceptions is memorization.
by Jessica Schirmer 1J
Sun Oct 15, 2017 4:13 pm
Forum: Properties of Light
Topic: Photons
Replies: 7
Views: 312

Re: Photons

Photons, as I understand, are referred to has being "massless" even though they have energy.
by Jessica Schirmer 1J
Sun Oct 15, 2017 4:02 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Variation of Empirical Equation of H-atom [ENDORSED]
Replies: 2
Views: 171

Variation of Empirical Equation of H-atom [ENDORSED]

In the Atomic Spectra Module, it was vaguely described that the equation


could be rearranged so that it looks like


Could someone please describe how this is derived in more detail? Thank you.
by Jessica Schirmer 1J
Sun Oct 08, 2017 9:50 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Terminology Clarfication [ENDORSED]
Replies: 7
Views: 890

Re: Terminology Clarfication [ENDORSED]

On this topic, I'm curious about their original question of if it affects the mass of the transition. I would assume not, or at least not significantly since electrons have a very small mass, but I was wondering if anyone else had input on that!
by Jessica Schirmer 1J
Sun Oct 08, 2017 9:32 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactant
Replies: 9
Views: 414

Re: Limiting Reactant

Once you calculate the moles of each reactant you have, given that the problem gave you two masses to begin with, you compare the ratios of those moles to the molar ratio provided by a balanced chemical equation. (The molar ratio is given by the stoichiometric coefficients). For example, if the rati...

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