Search found 20 matches
- Fri Dec 08, 2017 9:32 am
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Electron Withdrawing Power
- Replies: 3
- Views: 197
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"
- Fri Dec 08, 2017 9:26 am
- Forum: Bronsted Acids & Bases
- Topic: % dissociation
- Replies: 3
- Views: 283
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
You calculate this by: [H3O+]/initial concentration of acid x 100
- Fri Dec 01, 2017 9:55 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: drawing coordination compounds
- Replies: 5
- Views: 282
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.
- Fri Dec 01, 2017 9:51 am
- Forum: Biological Examples
- Topic: Memorization of compounds
- Replies: 5
- Views: 449
Re: Memorization of compounds
Yes! I believe we will need to know the charge of most ligands, at least many of the simple ones.
- Sun Nov 26, 2017 11:17 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: structure of chelate
- Replies: 2
- Views: 204
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.”
- 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: 335
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.
- Sun Nov 19, 2017 5:47 pm
- Forum: Hybridization
- Topic: 3 regions of e- density
- Replies: 3
- Views: 267
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...
- Sun Nov 19, 2017 5:21 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pairs
- Replies: 4
- Views: 257
Re: Lone Pairs
Lone pairs change the bond angles because they can repel the e- in the bonds more than another bonded pair.
- Sun Nov 12, 2017 1:35 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Radicals and bond angles
- Replies: 1
- Views: 135
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.
- Sun Nov 12, 2017 1:30 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond angles for molecules with lone pairs
- Replies: 1
- Views: 120
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.
- Fri Nov 03, 2017 8:58 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: d orbital or s orbital first?
- Replies: 5
- Views: 317
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...
- 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: 319
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).
- Sun Oct 29, 2017 9:48 pm
- Forum: Lewis Structures
- Topic: Placement [ENDORSED]
- Replies: 6
- Views: 309
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.
- Sun Oct 29, 2017 9:37 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: 4s and 3d orbitals
- Replies: 5
- Views: 516
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
- Sun Oct 22, 2017 6:15 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 2.43 (a) Silver
- Replies: 4
- Views: 272
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.
- 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: 555
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.
- Sun Oct 15, 2017 4:13 pm
- Forum: Properties of Light
- Topic: Photons
- Replies: 7
- Views: 377
Re: Photons
Photons, as I understand, are referred to has being "massless" even though they have energy.
- 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: 210
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.
could be rearranged so that it looks like
Could someone please describe how this is derived in more detail? Thank you.
- Sun Oct 08, 2017 9:50 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Terminology Clarfication [ENDORSED]
- Replies: 7
- Views: 974
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!
- Sun Oct 08, 2017 9:32 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactant
- Replies: 9
- Views: 507
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...