CHEMISTRY COMMUNITY

EveEmm3D

I think the proton transfer equation would be CH3COOH + NH3 -> CH3COO- + NH4+.

EveEmm3D

Lewis bases will have lone pairs of electrons that can be used to bond to another atom, like in NH3 for example, where N has a lone pair. Lewis acids will be "electron deficient" species, species that could accept more electrons. Some examples are BF3 where B has an incomplete octet, Pt4+,...

EveEmm3D

Yea but can anyone explain why?

EveEmm3D

What effect does temperature have on the pH of neutral water?

EveEmm3D

The coordination number of a compound is equal to the number of points at which ligands are attached so for polydentate ligands you have to count all the binding sites. For example, the coordination number of [PtCl2(en)2]2+ is 6 because en is bidentate.

EveEmm3D

Start by setting up your ICE table. The Initial partial pressures are 1.0 for NO, and 0 for O2 and N2. The Change is equal to +x for N2 and O2 and -2x for NO, since 2 mol of NO are required for each mol of O2 and N2 produced. Finally, your equilibrium pressures are (1.0 - 2x) for NO, and +x for N2 a...

EveEmm3D

The equilibrium constant is equal to Kc = [NH3]^2[CO2]. The concentration of ammonium carbamate doesn't go into the equation because it is in solid form. You can calculate the concentration of CO2 by first finding the number of mol of CO2 and dividing by the volume of the flask. As for NH3, the bala...

EveEmm3D

In the textbook! Page 743 at the bottom.

EveEmm3D

What does the (0) in the name of this compound, dimethylmercury(0), refer to ? Isn’t the oxidation of Hg 2+?

EveEmm3D

In part b of this example, how do we know that the oxidation state of Pt is 4+?

EveEmm3D

Based on the rules in the toolbox shouldnt the name of this compound be pentaaquathiocyanato(kN or kS depending on the connectivity)iron(III) ion ?

EveEmm3D

Can someone please explain why the name of this compound is thiocyanatopentaaqua(III) iron? Shouldn’t pentaaqua be first in the name since ligands are named in alphabetical order? And shouldn’t (III) be after iron, since it denotes its oxidation state?

EveEmm3D

I think Pd has a lower electron affinity than Ni because it has a complete 4d10 subshell. As for Cu and Ag, which have the same valence shell configuration, Ag might have a slightly higher electron affinity than Cu because it has more protons? The difference between their electron affinities is very...

EveEmm3D

Two regions! The two lone pairs repel each other very strongly and the most stable configuration is when they are as far apart as possible. This molecule has the same geometry as ClF3 — the two lone pairs are situated at equatorial positions 120 degrees apart.

EveEmm3D

The length of the bond is the distance between the centers of the atoms. The dipole moment depends on the multiplicity of the bond, as the length of the bond decreases with multiplicity (i.e., a double bond between two elements is shorter than a single bond between them, a triple bond shorter than a...

EveEmm3D

C has two lone electrons, so FC = V - (L + S/2) = 4 - (2 +6/2) = -1

EveEmm3D

Can you give an example of a molecule you are referring to? Your question might be easier to answer when looking at a specific molecule.

EveEmm3D

It's because the 4s electrons are higher in energy and so they can be removed more easily than electrons from the 3d shell.

EveEmm3D

All values of l up to l=5 are possible and I think should be listed. Although there are no known elements that have their 6f, 6g or 6h orbitals occupied when they are in their ground state, these orbitals could be occupied if the electrons are given enough energy -- the atom would then be in an exci...

EveEmm3D

I just checked my grades for Chem 14A on my.ucla and although hw and test 1 have been uploaded, Weekly Online Discussion says N/A although I have been posting regularly. Does it look like this for everyone else too? Does anyone know if they are all uploaded at the end of the quarter?
Thanks!

EveEmm3D

The electron in one electron atoms experiences the electrostatic attraction of the full charge of the nucleus. The situation is different in multi electron atoms however. The electrons in the outer shells are not only attracted by the positive nucleus, but also repelled by the other electrons and th...

EveEmm3D

Each electron is described by four quantum numbers n, l, ml, ms. When n = 2, l takes values l = 0, 1 (corresponding to s and p orbitals like you said). For l=0, ml =0, and for l = 1, ml = -1,0,1. For each n,l,ml combination we can have ms = 1/2 or ms = -1/2. Here are the quantum numbers of the elect...

EveEmm3D

You have to convert to kg because the Planck constant is in units of J s and 1 J = kg m^2/ s^2.

EveEmm3D

For c, me and h the same as the example above. L^2 comes out to 10^-20 m^2. Is that what you have for L^2?

EveEmm3D

1 mol of photons is 6.022 x 10^23 photons. The definition of the mole is that it contains as many objects(not necessarily atoms) as there are atoms in 12g of carbon-12.

EveEmm3D

I just did it and got the right answer. What I did was solve for the wavelength first and plug in the numbers at the end, just like they do in the example. I found that in problems like this you can end up with the wrong final answer if you plug in numbers earlier to calculate energy, frequency etc....

EveEmm3D

I was wondering the same thing! This question was asked earlier and someone replied that we don’t need to know how to write ionic equations. It wasn’t covered in lecture or the readings so I don’t think it would be something we would be tested on!

EveEmm3D

Since 3 mol of N2H4 react with 4 mol of ClF3 , if we have 12 mol of ClF3 only 9 mol of N2H4 are necessary, so 3 mol of N2H4 will be in excess. As for the products, if 4 mol of ClF3 give 12 mol of HF, how many mol of HF would you get for 12 mol of ClF3? Does this make sense?

CHEMISTRY COMMUNITY

Search found 28 matches

Re: 12.9 C

Re: Lewis Structure in identifying Acid or Base

Re: pH of neutral water and temperature

pH of neutral water and temperature

Re: coordination number/polydentates [ENDORSED]

Re: 11.43

Re: Homework 11.41

Re: Hg(CH3)

Hg(CH3)

Example 17.1

Re: [Fe(NCS)(OH2)5]2+ name

[Fe(NCS)(OH2)5]2+ name

Re: Determine Electron Affinity

Re: ICl3 shape

Re: Bond length [ENDORSED]

Re: Formal Charge of Carbon in CH3

Re: Bond Strength

Re: Electron configuration for Fe^2+ [ENDORSED]

Re: Possible Quantum numbers given n=6

Weekly online discussion points

Re: Effective Nuclear Charge

Re: Homework 2.29

Re: Units for Mass [ENDORSED]

Re: Help on Self-Test 1.8A

Re: 1.27

Re: Help on Self-Test 1.8A

Re: M9

Re: M6