CHEMISTRY COMMUNITY

Sam Kelly 1K

KF dissociates into K+ and F- in solution. K+ would not be a good proton acceptor, since K+ and H+ don't react at all. F- and H+ on the other hand do react, making the weak acid of HF. Since HF is a weak acid, it will only partially dissociate, with only some of it turning back into the individual c...

Sam Kelly 1K

The situation you described made me think of [SO3]-2 (sulfite), but I don't think that it's able to accept a single proton. Same goes for sulfurous acid, [H2SO3]-2 since it doesn't accept a proton to make H3SO3-. This is just one example of atoms with expanded octets, so maybe other ones can be amph...

Sam Kelly 1K

Another technology that can be used to reduce acid rain is the catalytic converter, which is a device for cars that transforms toxic gases into less toxic pollutants by way of a redox reactions. The combustion reactions that take place in catalytic converters are as follows: 1. 2CO + O2 -> 2CO2 2. C...

Sam Kelly 1K

Like Matthew said, CN- is a common polyatomic ion that we are expected to know for tests and such. (Don't feel bad if you didn't have it memorized, just try to incorporate them into hw problems to the point where they become natural.) Using the knowledge that CN has a -1 charge, you can figure out t...

Sam Kelly 1K

Thank you for this

Sam Kelly 1K

One way to think of it is by looking at the coordination compound, [Ni(NH3)4 Cl] Cl . 2H2O in this case, as a more complex version of something like HCl, where the H is replaced by the the [Ni(NH3)4 Cl] complex. I'm not exactly sure about the relationship between the complex and the Cl outside of th...

Sam Kelly 1K

Yeah the angles would be slightly less than 90 and 120 degrees due to the lone pair, but you wouldn't have to give exact numbers on a test or anything

Sam Kelly 1K

Probably wouldn't hurt to list 180 as a bond angle

Sam Kelly 1K

Could you give an example? It may be easier to explain using a specific case of hybridization, but in general the unpaired electron will impact the hybridization of the molecule in some way, similar to how electron pairs would.

Sam Kelly 1K

Yeah I think we just need to know what angles are affiliated with the different shapes, but that should be feasible through thinking about electron pair repulsion.

Sam Kelly 1K

Dana Wilks 3I wrote:He still hasn't announced if next week's Wednesday lecture will be cancelled. Hopefully we'll be ahead enough!

Does anyone know exactly what point in the book we have to get to to be considered ahead?

Sam Kelly 1K

Hey all, here is a fun article about some chemistry that can be applied to Thanksgiving! Hope everyone has a great break!

https://sciencebob.com/bend-a-bone-with-vinegar/

Sam Kelly 1K

During lecture Lavelle gave us the experimental value for the average bond length in Nitrate, which turned out to be 1.24 A, maybe because when you draw the three possible structures for NO3-, there are two single bonds and one double bond. That being said, I think the correct answer on the midterm ...

Sam Kelly 1K

Elisa explained it well, but here is a graphical representation which might help:
https://www.chem.purdue.edu/gchelp/liquids/inddip.html

Sam Kelly 1K

As previous posters have made clear, single bonds are typically longer and weaker, while double and triple bonds are each shorter and stronger. I think the strength of single/double/triple bonds also has to do with the lone electron pairs, however. In a single bond, for example, you will typically h...

Sam Kelly 1K

Are Van der Waal Forces a specific type of dispersion force or can they be used interchangeably?

Sam Kelly 1K

What properties (e.g. bond energy, melting point) does a coordinate covalent bond that differ from a normal covalent bond?

Sam Kelly 1K

Albert Duong 1B wrote:Generally, single bonds are always sigma bonds, but multiple bonds will have both sigma and pi bonds.

In what situations would single bonds not be sigma bonds?

Sam Kelly 1K

To solve for this, we would use the equation ∆x∆p = h/4π. For an electron, ∆p = m∆v, and therefore, m∆x∆v = h/4π. The uncertainty on position of an electron would be the diameter of the atom so ∆x = 350 pm. "m" is the mass of the electron which is 9.109*10^-31 kg and h=6.626*10^-34 J.s Ho...

Sam Kelly 1K

So should we expect to have to use this equation on the test/midterm/final? Or more just understand the concept?

Sam Kelly 1K

How do you guys usually study for our tests? Typically I just review the chapter/notes and do some practice problems. Is there another good way to review?

Sam Kelly 1K

Electrons have wavelike properties due to the diffraction patterns that they form, due in part to their extremely small size

Sam Kelly 1K

So does the concept of black bodies explain why objects go from being red hot to being white hot?

Sam Kelly 1K

Thanks for the advice! Would you say the same thing applies for students planning on going to graduate/professional school in a STEM field, but not necessarily med school? Absolutely! Dr. Lavelle's Chem14A and 14B courses are imperative for laying down the foundation for any science classes you tak...

Sam Kelly 1K

I imagine we should stick to v (nu) since that's what Lavelle has used in lectures and will likely look for on exams.

Sam Kelly 1K

Sort of unrelated, but since we are working solely with the speed of light in a vacuum, I'm wondering what the speed of light is when not in a vacuum (if that even makes sense?)

Sam Kelly 1K

On a related note, is there any connection between the velocity of an electron and frequency? 1B.15 asks for wavelength of an ejected electron using a given velocity, so I am unsure of how to approach the problem.

Sam Kelly 1K

Yeah as Rosemary said, formula unit refers to the empirical formula of a compound, or the lowest ratio of ions in an ionic compound. For example, NaCl is the formula unit of table salt/sodium chloride. Other compounds like NH4NO2 are a little more complicated, since one might think it could just be ...

Sam Kelly 1K

I agree with Andie on this one, in that just comparing the number of atoms in a compound is an unreliable way of determining mass composition. Rather, you can estimate the percent mass by comparing rounded values of the 3 elements in nitric acid (H ~ 1g, N ~ 14g, O3 ~ 48g), and see that oxygen has t...

Sam Kelly 1K

Thanks for the advice! Would you say the same thing applies for students planning on going to graduate/professional school in a STEM field, but not necessarily med school?

CHEMISTRY COMMUNITY

Search found 30 matches

Re: KBr has Neutral pH ?

Re: Amphoteric Structure

Re: Reducing Acid Rain

Re: Ligand charge

Re: Happy Lavelle [ENDORSED]

Re: TM charge

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Re: Seesaw Bond Angles

Re: hybridization and radicals

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Re: MIDTERM Bond Length Question

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Studying for tests/midterm

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