CHEMISTRY COMMUNITY

janeane Kim4G

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?

janeane Kim4G

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.

janeane Kim4G

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.

janeane Kim4G

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...

janeane Kim4G

Can someone provide a general outline of the material tested in test 3. Also, to make sure, will coordination compounds be on this test?

janeane Kim4G

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?

janeane Kim4G

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?

janeane Kim4G

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.

janeane Kim4G

They’re the same thing

janeane Kim4G

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.

janeane Kim4G

Thanks for clarifying! I was going off of the exam and test schedules link in the website, so maybe it was wrong.

janeane Kim4G

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?

janeane Kim4G

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...

janeane Kim4G

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...

janeane Kim4G

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.

janeane Kim4G

I haven’t done the computation for this lol but you’re right to use deBroglie, as the question isn’t for a photon

janeane Kim4G

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?

janeane Kim4G

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?

janeane Kim4G

I don't believe it matters, as long as the amount of electrons are correct.

janeane Kim4G

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?

janeane Kim4G

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...

janeane Kim4G

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...

janeane Kim4G

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...

janeane Kim4G

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.

janeane Kim4G

Agreed, the simple answer is that it is massless but with momentum and energy.

janeane Kim4G

Thank you! This really helped

janeane Kim4G

“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?...

janeane Kim4G

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...

janeane Kim4G

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?

janeane Kim4G

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?

janeane Kim4G

This is so helpful thank you :-,,)

CHEMISTRY COMMUNITY

Search found 31 matches

What exactly is a ligand?

Re: Transition Metals

Re: Hybridization

Re: VSEPR

Test 3 material

Which bond would break first.

Why are sigma bonds stronger than pi bonds?

Re: 7th edition 3F.15 polarity and boiling points

Re: Angular vs. Bent

Re: 4 regions of electron density

Re: Test 3 dates?

Test 3 dates?

Re: Polarity and Molecular Shape

Re: induced-dipole

Re: Dissociation energy

Re: Calculating Wavelength of electron

Resonance hybrids on the test?

Re: Perchlorate (ClO4)-

Re: Dots in Lewis Stucture

Likely ion charge for Ga?

Re: λ=h/p vs λ=hc/E

Re: 34B Photoelectric effect module

Re: Module Post Assessment #34B

Re: What does v stand for?

Re: Mass of Electrons and Photons

Re: Help with M9?

Help with M9?

Re: Moles!

Anyone do G15 A?

How to find volume of solution w specific amount of Na2CO3?

Re: Advice from a Medical Student [ENDORSED]