Search found 31 matches
- Wed Dec 05, 2018 4:02 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: What exactly is a ligand?
- Replies: 2
- Views: 315
What exactly is a ligand?
Exactly as the topic states, I have no idea what a ligand is and it’s significance/ what it’s used for. Does anyone have a simplified explanation for dummies?
- Sun Dec 02, 2018 5:31 pm
- Forum: *Molecular Orbital Theory Applied To Transition Metals
- Topic: Transition Metals
- Replies: 5
- Views: 1844
Re: Transition Metals
to go further from the previous reply, the transitions metals belong in the d-block, meaning they are able to have more oxidation states than elements that do not. At this point, the electron shells do not have a lot of difference in energy like there was between the s and 2p orbitals.
- Sun Dec 02, 2018 5:21 pm
- Forum: Hybridization
- Topic: Hybridization
- Replies: 3
- Views: 430
Re: Hybridization
Yes, an AX2E would be a liner structure, but you should also know that there are other VSEPR structures that translate to liner, for example AX2E3.
- Sun Dec 02, 2018 5:18 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR
- Replies: 4
- Views: 554
Re: VSEPR
If you mean one central atom connected to two other atoms, the VSEPR would be AX2E. That means there are 3 regions of electron density, including the lone pair that you specified. However, if you mean 3 atoms by one central atom connected to 3 atoms with a lone pair on the central atom, then the str...
- Tue Nov 27, 2018 10:08 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 3 material
- Replies: 3
- Views: 507
Test 3 material
Can someone provide a general outline of the material tested in test 3. Also, to make sure, will coordination compounds be on this test?
- Sun Nov 25, 2018 2:42 am
- Forum: Sigma & Pi Bonds
- Topic: Which bond would break first.
- Replies: 15
- Views: 2740
Which bond would break first.
Realistically, in a double bond of one pi and one sigma bond, which bond would break first? I would think it’s the pi bond, but I have no idea why, can someone elaborate?
- Sun Nov 25, 2018 2:41 am
- Forum: Sigma & Pi Bonds
- Topic: Why are sigma bonds stronger than pi bonds?
- Replies: 10
- Views: 4716
Why are sigma bonds stronger than pi bonds?
Since pi bonds have more than one area of interception, wouldn’t that mean the bonds formed form a pi bond would have more area of intersection and therefore more strength?
- Sun Nov 25, 2018 2:25 am
- Forum: Dipole Moments
- Topic: 7th edition 3F.15 polarity and boiling points
- Replies: 1
- Views: 353
Re: 7th edition 3F.15 polarity and boiling points
You’re right, in this case the lone pair will lead to an uneven electron distribution, leading to polarity. AsF5 on the other hand has no lone pairs, therefore the charge and electron density is equally distributed, making it harder to break up the bonds.
- Sun Nov 18, 2018 2:35 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Angular vs. Bent
- Replies: 7
- Views: 2059
Re: Angular vs. Bent
They’re the same thing
- Sun Nov 18, 2018 2:33 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 4 regions of electron density
- Replies: 3
- Views: 424
Re: 4 regions of electron density
When there are 4 regions of electron density, the molecule takes up a tetrahedral shape. The 2 lone pairs take up any 2 “spaces” in the shape. That leads to the molecule itself being a literal observed bent shape.
- Mon Nov 12, 2018 3:46 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 3 dates?
- Replies: 11
- Views: 1322
Re: Test 3 dates?
Thanks for clarifying! I was going off of the exam and test schedules link in the website, so maybe it was wrong.
- Mon Nov 12, 2018 9:14 am
- Forum: Administrative Questions and Class Announcements
- Topic: Test 3 dates?
- Replies: 11
- Views: 1322
Test 3 dates?
I noticed that test 3 is on the week on Nov 20, which is also thanksgiving week. For students with a dicussion on thursday or Friday, are we excpected to be there during the vacation weekend to take the test?
- Sat Nov 10, 2018 1:30 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polarity and Molecular Shape
- Replies: 1
- Views: 371
Re: Polarity and Molecular Shape
yes! Polarity does affect the shape of the vsepr. This can best be observed between the difference in structure between CO2 and H2O. CO2 has C as the central atom and double bonds with the 2 Oxygen next to it. In this case, the C has no lone pairs and the poles are evenly distributed between the mol...
- Sat Nov 10, 2018 1:09 pm
- Forum: Dipole Moments
- Topic: induced-dipole
- Replies: 2
- Views: 360
Re: induced-dipole
I think typically the dipole dipole is stronger mainly because it is only formed when there are permanent poles in molecules. In comparison, dispersion forces are due to instantaneous distortions of the electron cloud and can be observed in all molecules. I would imagine that there would be some mol...
- Wed Nov 07, 2018 4:52 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: Dissociation energy
- Replies: 3
- Views: 453
Re: Dissociation energy
I don’t think a negative value is possible. A negative number would mean that energy is released when a bond is being broken, but energy is only released when bonds are formed.
- Sun Nov 04, 2018 12:56 am
- Forum: Photoelectric Effect
- Topic: Calculating Wavelength of electron
- Replies: 3
- Views: 1267
Re: Calculating Wavelength of electron
I haven’t done the computation for this lol but you’re right to use deBroglie, as the question isn’t for a photon
- Tue Oct 30, 2018 4:12 pm
- Forum: Resonance Structures
- Topic: Resonance hybrids on the test?
- Replies: 2
- Views: 363
Resonance hybrids on the test?
Hello! Does anyone know if we are expected to write all the possible resonance structures for a certain resonance hybrid should they be questioned on the midterm. Would we be marked off for not drawing the structure that is most stable?
- Tue Oct 30, 2018 4:07 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Perchlorate (ClO4)-
- Replies: 7
- Views: 12472
Re: Perchlorate (ClO4)-
Can someone explain why 3 O would be double bonded with the Cl? Is there a way to determine if an element like Cl will/will not follow the octet guideline?
- Tue Oct 30, 2018 4:02 pm
- Forum: Lewis Structures
- Topic: Dots in Lewis Stucture
- Replies: 14
- Views: 1253
Re: Dots in Lewis Stucture
I don't believe it matters, as long as the amount of electrons are correct.
- Mon Oct 29, 2018 11:31 pm
- Forum: Ionic & Covalent Bonds
- Topic: Likely ion charge for Ga?
- Replies: 2
- Views: 514
Likely ion charge for Ga?
This is part c of 2.15A asking for the likely charge for the ions formed from Ga. the answer is 3+, which makes it isoelectric to Ni. Does anyone know why Ga would not approach group 18 and likely become Ga3+ instead?
- Tue Oct 23, 2018 2:51 pm
- Forum: Einstein Equation
- Topic: λ=h/p vs λ=hc/E
- Replies: 6
- Views: 3839
Re: λ=h/p vs λ=hc/E
Hello! This first equation λ=h/p is the debroglie wave equation, it finds the hypothetical wavelengths of all items with a velocity and mass. λ= hc/E is the photon wavelength equation, used when measuring the energy of photons- note there is variable c, the speed of light, where λ=h/p does not. I do...
- Tue Oct 23, 2018 2:44 pm
- Forum: Photoelectric Effect
- Topic: 34B Photoelectric effect module
- Replies: 2
- Views: 388
Re: 34B Photoelectric effect module
Hi, From the given wavelength, you can calculate the energy of the light with the equation E= hc/lambda (6.626*10^-34 Js)(3*10^8ms)/(194*10^-9m) = 1.023*10-18 J Recall that you found the work function ( E needed to eject an electron) in part A and that E(kinetic)= E(photon)-work function. Thus subtr...
- Thu Oct 18, 2018 3:21 am
- Forum: Photoelectric Effect
- Topic: Module Post Assessment #34B
- Replies: 2
- Views: 525
Re: Module Post Assessment #34B
Hello! For this problem, you would use the equations frequency=c/wavelength, E=hv, and E(kinetic)=E(photon)-work function in that order. Use the first equation to and plug in the given 194 nm in correct units to find the frequency of the light ray: (3*10^8)/(1.94*10^-9 m)= 1.55*10^15 Hz Then, we can...
- Mon Oct 15, 2018 1:02 am
- Forum: Properties of Light
- Topic: What does v stand for?
- Replies: 1
- Views: 1201
Re: What does v stand for?
Hi! The v in (mass*velocity) stands for velocity, and the other v that you see is most likely the Greek letter nu, which looks like a slanted v and stands for the frequency.
- Thu Oct 11, 2018 6:30 pm
- Forum: Properties of Electrons
- Topic: Mass of Electrons and Photons
- Replies: 2
- Views: 277
Re: Mass of Electrons and Photons
Agreed, the simple answer is that it is massless but with momentum and energy.
- Tue Oct 09, 2018 9:22 am
- Forum: Limiting Reactant Calculations
- Topic: Help with M9?
- Replies: 2
- Views: 1944
Re: Help with M9?
Thank you! This really helped
- Tue Oct 09, 2018 2:17 am
- Forum: Limiting Reactant Calculations
- Topic: Help with M9?
- Replies: 2
- Views: 1944
Help with M9?
“Copper (II) nitrate reacts with sodium hydroxide to produce a precipitate of light blue copper (II) hydroxide. A) write the net ionic equation for the reaction B) calculate the max mass of copper (II) hydroxide that can be formed when 2.00g of sodium hydroxide is added to 80.0 mL of .500M Cu(NO3)2?...
- Tue Oct 02, 2018 3:14 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Moles!
- Replies: 7
- Views: 803
Re: Moles!
I have almost no chem experience so i might confuse you more lol but I got it down through the equations. Molar mass of an element is usually measured in g/mol. One mole is the # of atoms in 12g of carbon12, but it’s also Avogadro’s number. (6.02 x10^23). So for example, the molar mass of C on the p...
- Tue Oct 02, 2018 2:48 pm
- Forum: Student Social/Study Group
- Topic: Anyone do G15 A?
- Replies: 2
- Views: 474
Anyone do G15 A?
Heya back with a molarity q, what volume of .778 M Na2CO3(aq) shouldbe diluted to 150.0 mL of water to make the concentration 0.0234 M NaCO3(aq)? How do you start/ approach problems like this?
- Tue Oct 02, 2018 12:17 am
- Forum: Molarity, Solutions, Dilutions
- Topic: How to find volume of solution w specific amount of Na2CO3?
- Replies: 2
- Views: 3185
How to find volume of solution w specific amount of Na2CO3?
It’s G5 part c on the 7th edition for reference. If a student has a 250mL solution of 2.111g of sodium carbonate, what volume of the solution should be transferred into a separate flask to obtain 50.0 mg of Na2CO3?
- Mon Oct 01, 2018 9:10 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student [ENDORSED]
- Replies: 297
- Views: 446299
Re: Advice from a Medical Student [ENDORSED]
This is so helpful thank you :-,,)