CHEMISTRY COMMUNITY

Michael Le 2D

There's also a reduction reaction that utilizes the NO3 ion and that has an E of .96V. Why isn't this used?

Michael Le 2D

What's the difference between NO and ON?

Michael Le 2D

Upon drawing NO2+ or in the book +NO2 all of the elements have a complete octet. Why is it then an electrophile?

Michael Le 2D

Benzene has a ring structure and multiple double bonds. Why isn't it called uh... 1,3,5 cyclohexatriene? I'm not sure if that's correct but at least why isn't there a cyclo - ?

Michael Le 2D

A good way to remember this is that phile means 'loving' ... therefore electrophile -> electron loving (which eventually you can deduce is because they are electron deficient). This will allow you to remember that they are partial positive, attracted by electrons, etc.

Michael Le 2D

Additionally, the delta G is actually the difference between TS2 and the intermediate NOT the reactant. This is important!

Michael Le 2D

Per my understanding, intermediates are a sort of middle ground between reactants and products. A reactant becomes an intermediate and then this intermediate becomes a product. Transition states are HOW these these species are transforming. Transition states involve bonds IN THE PROCESS of breaking/...

Michael Le 2D

Cell potential increases and decreases are dictated by the parameters in the Nernst equation (mols of electron, temperature, concentration of ions in cell).

Michael Le 2D

Just think of it in terms of Le Chatelier's Principle. Removing a product will force the reaction to the right and encourage this forward reaction (which encourages electron production) thereby increasing E over E (naut or E standard). The same goes for removing a reactant or adding some product.

Michael Le 2D

Yes! You need to multiple the standard potential given by -1. Although if you multiply the entire reaction with some stoichiometric scalar (say you need 2 mols of Cu+ instead of just 1), the standard potential remains the same. This is because standard reduction potential gives the voltage differenc...

Michael Le 2D

Hello! It is given in the problem as the enthalpy of sublimation.

Michael Le 2D

I don't have my course reader any longer; where is the office where we can pick up our fall quarter finals and when is the office open?

Michael Le 2D

Additionally, the solution manual notes that q cal = C*deltaT... a positive value for q despite the temperature rising 7.32 degrees celsius. Does that mean the heat came from the calorimeter into the water?

Michael Le 2D

I was under the impression that we broke all the bonds that weren't repeated (this becomes apparent when one counts the bonds from reactants and products and see say, two X-Y bonds). If one broke all the bonds and included all of the bond formations these values would inherently cancel anyhow. I'm n...

Michael Le 2D

https://scienceisntscary.files.wordpress.com/2013/05/heating-curve.png This is the explanation in a graphical sense. If we visualize just the boiling water (the leftmost point on the red colored line), we see that the heat added which is the heat that transfers into the skin when the skin comes in ...

Michael Le 2D

I believe this point is also called the halfway point.

Michael Le 2D

Stoichiometric and equivalence points are synonymous. I believe the halfway point refers to weak/strong titrations and the actual point occurs when pH=pkA/pkB. I believe it is halfway to the stoichiometric point.

Michael Le 2D

I believe strong acids and bases are poor buffers because their respective conjugate bases/acids are extremely weak. In order to be an effective buffer, both the acid and its conjugate base have to be relatively weak. Check this picture out for a graphical representation: http://forums.studentdoctor...

Michael Le 2D

http://www.chemgapedia.de/vsengine/media/width/247/height/178/vsc/de/ch/16/biochem/grafik/edta.svg.jpg Looking at the 4 oxygens with a - and the two nitrogens with one lone pair makes EDTA have six lone pair binding sites. Why are we not taking into account the oxygens that are double bonded, don't...

Michael Le 2D

In this case Dr. Lavelle, why is it that CO3 (2-) can be bidentate. Considering that H2O has angles of 109.5 between the lone pairs and can only form 1 binding site how come the 120 degrees (> than 109.5) in CO3 (2-) can form two binding sites despite being wider than water?

Michael Le 2D

For ligands such as ethylene DI amine(en) or ethylene DI amine TETRA acetato (EDTA), I understand that we have to use bis, tris, tetrakis when referring to multiple of these ligands. For oxalato in question 17.31D, oxalato is referred to as bisoxalato. Why not dioxalato for this ligand considering t...

Michael Le 2D

Given a lewis structure we'll know the number of sigma/pi bonds just given the number of single/double/triple bonds. Sigma for all single bonds and pi bonds for anything above so (doubles are 1 sig 1 pi, triples are 1 sig 2 pi). As for that hybridization notation we'll have to figure out which orbit...

Michael Le 2D

Why is it that sigma bonds are lower energy than pi bonds but in atoms with z>8, their anti bonding counterparts are higher nrg than the pi bonds. What exactly is an anti bonding orbital? We can see the sigma and pi bonds in a molecules 3D bond representation but can we see the anti bonding orbitals?

Michael Le 2D

The debye was introduced in the course reader; for molecules such as CCl3F, how do we know if the dipole is towards the Cls or towards the F. We know that the F-C difference is greatest and its individual dipole will be the strongest but if we add the dipole moments as vectors with units debye, are ...

Michael Le 2D

Assuming different elemental sizes, why is it that the cation charge (+2 or +3 etc.) is such a big determinant of an element's polarizing power. For example, I understand that Be2+ is much smaller than Sr2+ but the high powered nucleus of Strontium isn't enough to overcome the electron repulsions an...

Michael Le 2D

The book in chapter 2.5 describes inner-shell electrons as having a "penetrating effect." This is also seen in question #2.37 which states that electrons in an s-orbital are more effective than those in other orbitals at shielding from the nuclear charger because an electron in an s-orbita...

Michael Le 2D

In the experiment that led to Heisenberg's Indeterminacy equation, a major point was that the distance that the electron traveled could not be calculated with certainty because we weren't sure how much it had been deflected off of its path. Hypothetically speaking, if we were to set up a pair of sen...

Michael Le 2D

In 1.0 s, a 60 W bulb emits 11 J of energy in the form of infrared radiation (heat) of wavelength 1850 nm. What is the energy per photon of light emitted? How many photons of infrared radiation does the lamp generate in 1.0 s? So I understand how to do the first part of the problem but I'm not reall...

CHEMISTRY COMMUNITY

Search found 28 matches

Re: Final 2014 question 3A pikachu

Re: Residual Entropy of NO compared to BF3

NO2+ as an electrophile

Benzene

Re: Electrophile

Re: Transition States

Re: Intermediates vs. Transition States

Re: Cell Potential Increase/Decrease

Re: Effects of Adding Reactants and Products

Re: Standard Reduction Potential Calculations

Re: problem 8.67 b

Picking up the final

Re: Help Breaking Down 8.25

Re: Bond Enthalpies

Re: Steam v Water

Re: Titration curve question

Re: What are the different names for stoichiometric point?

Re: Buffers

EDTA binding sites

Re: How to determine monodentate or bidentate?

Bisoxalato vs. Dioxalato

Re: Identifying the composition of bonds/hybridizations nota

Bonding Molecular Orbital Energies

Dipole moments with vectors

Polarisability

Penetration

Heisenberg Indeterminacy Experiment

How many photos of infrared radiation?