Search found 32 matches
- Sat Dec 08, 2018 7:32 pm
- Forum: Lewis Structures
- Topic: octet
- Replies: 1
- Views: 325
Re: octet
elements that are closer to the noble gases periodically speaking are going to want to fulfill the octet rule since theyre already close to a full 8 electrons. Elements like in group 13 only have 5 valence electrons so its more work to get those electrons for their full octet so they dont subscribe ...
- Sat Dec 08, 2018 7:28 pm
- Forum: Photoelectric Effect
- Topic: work function
- Replies: 4
- Views: 886
Re: work function
you dont, frequency allows you to find the energy of the proton but you would need to be given velocity or kinetic energy to find the work function.
Re: naming
For CN (Cyanide) yes you must memorize the charge of -1. There is a list on Professor Lavelles website titled "Naming Coordination Compounds" that has all the ligands you need to memorize along with their charges. If its not on there, its either a transition metal that can have multiple ox...
- Fri Dec 07, 2018 8:47 pm
- Forum: Coordinate Covalent Bonds
- Topic: Chelating and heme complex
- Replies: 2
- Views: 2089
Re: Chelating and heme complex
A chelating complex is a molecule that is polydentate. Since it bonds in multiple places on the molecule it will form a sort of ring structure. This ring structure is a chelate.
- Fri Dec 07, 2018 8:45 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Review question
- Replies: 1
- Views: 299
Re: Review question
You need to draw out the lewis structures of each molecule and observe what kind of intermolecular forces each one has. After telling which one each one was you need to recall that some intermolecular forces are stronger than others. the strongest intermolecular force is hydrogen bonds while the wea...
- Fri Dec 07, 2018 8:39 pm
- Forum: Bond Lengths & Energies
- Topic: Review question
- Replies: 3
- Views: 690
Re: Review question
I believe it is Carbon bonded to the other carbon because out of all those atoms, carbon is the smallest. Since its the smallest, the atoms will be closer together when bonded bc their bonds are slightly shorter.
- Fri Dec 07, 2018 8:34 pm
- Forum: Naming
- Topic: Naming Coordinate Compounds
- Replies: 3
- Views: 458
Re: Naming Coordinate Compounds
honestly, you just need to memorize the names. You only need to remember the common names though, not the new IUPAC ones. So just memorize the center column of the naming coordinate compounds page on lavelles website.
- Fri Dec 07, 2018 8:28 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentate ligands
- Replies: 2
- Views: 359
Polydentate ligands
How do we tell how many dentates a ligand has? From what I understand everything after bidentate is polydentate right?
- Sun Dec 02, 2018 10:32 pm
- Forum: Dipole Moments
- Topic: Strength of intramolecular forces due to polarity
- Replies: 5
- Views: 630
Re: Strength of intramolecular forces due to polarity
a good way to remember that polar molecules form dipole dipole interactions between them is the fact that the word "pole" of polar is in the name dipole.
- Sun Dec 02, 2018 10:26 pm
- Forum: Naming
- Topic: Transition Metal in naming
- Replies: 2
- Views: 355
Transition Metal in naming
Is there any particular why the transition metal always go last in the order when naming a compound?
- Sun Dec 02, 2018 10:24 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis acid/ bronsted acid
- Replies: 1
- Views: 218
Lewis acid/ bronsted acid
Is there any difference between lewis and bronsted acids besides the way they're explained? Bc lewis is the electron acceptor while bronsted is proton donor, so same thing really right?
- Sun Nov 11, 2018 10:48 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge on central atom
- Replies: 5
- Views: 1112
Re: Formal charge on central atom
the closer to zero the charge is, the more stable the entire compound will be. Since its the central atom its especially important since its bonding with every other atom in the compound.
- Sun Nov 11, 2018 10:48 pm
- Forum: Electronegativity
- Topic: Greater Ionic character
- Replies: 3
- Views: 544
Re: Greater Ionic character
Carbon with Sulfur would be more electronegative since the trend of electronegativity is up and to the right, sulfur is below oxygen in its group.
- Sun Nov 11, 2018 10:46 pm
- Forum: Bond Lengths & Energies
- Topic: Bond lengths and resonance structure
- Replies: 2
- Views: 316
Re: Bond lengths and resonance structure
yes, so if one has bonds of 140 pm and the other has length of 120 pm, the average would be 130 pm.
- Wed Nov 07, 2018 6:04 am
- Forum: Octet Exceptions
- Topic: Octet Exceptions
- Replies: 4
- Views: 557
Re: Octet Exceptions
everything in period 3 and below may have an expanded octet (bc their energy level allows D subshell to be filled)
Everything in group 13 is satisfied WITHOUT a full octet.
So I just remember period 3 and below expand
Group 13- satisfied with less
Everything in group 13 is satisfied WITHOUT a full octet.
So I just remember period 3 and below expand
Group 13- satisfied with less
- Thu Nov 01, 2018 6:26 pm
- Forum: Lewis Structures
- Topic: Lewis Structures (w/ same formal charge but different bonds)
- Replies: 2
- Views: 327
Re: Lewis Structures (w/ same formal charge but different bonds)
Since a double bond is more stable than a single bond, I believe the same logic applies. So I believe that a triple bond, if the formal charge is lowest it can be, would be preferable.
- Wed Oct 31, 2018 8:03 pm
- Forum: Ionic & Covalent Bonds
- Topic: Multi-Electron Atom
- Replies: 3
- Views: 429
Re: Multi-Electron Atom
a multi electron atom is any atom besides hydrogen. That is the coulomb potential energy which is charge 1 times charge 2 over distance between charges. It measures the force of attraction between 2 points.
- Wed Oct 31, 2018 7:35 pm
- Forum: Lewis Structures
- Topic: Most stable lewis
- Replies: 1
- Views: 222
Most stable lewis
How do we know which resonance structure is the most stable? Can you do it by just looking at the lewis structures?
- Wed Oct 31, 2018 7:35 pm
- Forum: Lewis Structures
- Topic: Most stable lewis
- Replies: 3
- Views: 391
Most stable lewis
How do we know which resonance structure is the most stable? Can you do it by just looking at the lewis structures?
- Sun Oct 28, 2018 2:22 pm
- Forum: Properties of Electrons
- Topic: Conceptual Test question
- Replies: 1
- Views: 254
Re: Conceptual Test question
Shells of an atom have discrete energy levels between shells, this question was discussing the energy it takes to get from one to the other.
- Sun Oct 28, 2018 9:32 am
- Forum: Lewis Structures
- Topic: Lewis Structures in Ionic Bonds
- Replies: 2
- Views: 264
Re: Lewis Structures in Ionic Bonds
yes, we did an example in class of the ionic compound Potassium Chloride
- Sat Oct 27, 2018 7:31 pm
- Forum: *Shrodinger Equation
- Topic: Threshold Energy
- Replies: 4
- Views: 765
Re: Threshold Energy
Schrodingers equation defines wave functions. Threshold energy has to do with the photoelectric effect as the minimum energy to remove an electron from a metal.
- Sat Oct 27, 2018 7:25 pm
- Forum: Student Social/Study Group
- Topic: Winter quarter scheduling
- Replies: 6
- Views: 1057
Re: Winter quarter scheduling
I talked to my academic counselor and she said most people dont end up taking the class and lab at the same time. It's fine to take the lab at a later quarter.
- Fri Oct 19, 2018 8:23 pm
- Forum: DeBroglie Equation
- Topic: DeBroglie wavelike properties question
- Replies: 4
- Views: 493
DeBroglie wavelike properties question
So, according to the DeBroglie Equation, whether something has wavelike properties or not is dependent on how small it's wavelength is, correct?
What is the threshold number of wavelength that separates those with wavelike properties to those without?
What is the threshold number of wavelength that separates those with wavelike properties to those without?
- Fri Oct 19, 2018 7:45 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect
- Replies: 1
- Views: 188
Re: Photoelectric Effect
If you are given the kinetic energy of the launched electron and the threshold energy of the metal it launched from, then yes you do need to use the kinetic energy to find the energy of the proton because the energy of the proton will be Kinetic Energy + Threshold energy.
- Tue Oct 16, 2018 10:01 pm
- Forum: Properties of Light
- Topic: Hmwrk 1.9
- Replies: 2
- Views: 312
Re: Hmwrk 1.9
I can confirm that the wavelength is 1 meter, I found this by plugging in the C constant and the frequency given (which happened to be the same # as the c constant) into the equation C= Lambda x V. So after dividing C by the frequency V I got the wavelength as 1 meter.
- Sat Oct 13, 2018 11:02 pm
- Forum: Properties of Electrons
- Topic: photoelectric effect question
- Replies: 2
- Views: 244
photoelectric effect question
I understand that the energy of a photon minus the threshold energy to remove the electron from a metal surface is kinetic energy or Ek=1/2 M-V^2 but what does the kinetic energy equation mean? Why is there a 1/2 and what does the M stand for? why is the frequency squared?
- Sat Oct 13, 2018 10:42 pm
- Forum: Properties of Light
- Topic: Wave vs. Photon
- Replies: 2
- Views: 177
Re: Wave vs. Photon
A photon is a packet carrying light energy. These photons travel in waves. Intensity of light can be thought of as the amount of photons.
- Tue Oct 09, 2018 7:10 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Online Module Problem Dilutions
- Replies: 2
- Views: 769
Re: Online Module Problem Dilutions
first, convert the 5.00 grams of KMnO4 to mols. You should get .03164 moles. Then find the molarity by dividing this number by .15 liters, getting .211 M. Then set up a M1V1=M2V2 with M1 being .211, V1 being .02L, and V2 being .25L. Solve for M2 and thats your answer.
- Thu Oct 04, 2018 3:56 pm
- Forum: Empirical & Molecular Formulas
- Topic: How to write empirical/ molecular formulas
- Replies: 3
- Views: 379
Re: How to write empirical/ molecular formulas
the general rule, i believe, is that Carbon always goes first, followed by Hydrogen, and then continued by the elements in alphabetical order.
- Tue Oct 02, 2018 10:21 pm
- Forum: General Science Questions
- Topic: Post Module Assessment
- Replies: 3
- Views: 291
Re: Post Module Assessment
No, dont put a 10 in front of that, the equation is already balanced. Try converting kg to grams and then converting this to moles (using atomic # from periodic table) then compare stoichiometric coefficients to find the ratio from your reactant to product
- Fri Sep 28, 2018 1:07 pm
- Forum: SI Units, Unit Conversions
- Topic: How does grading for discussion posts work?
- Replies: 80
- Views: 8697
Re: How does grading for discussion posts work?
I believe you need to post in one way or another 3 times per week to receive full credit for that week. Each post/comment is worth 1 point.