Search found 28 matches

by EveEmm3D
Thu Dec 07, 2017 5:54 pm
Forum: Conjugate Acids & Bases
Topic: 12.9 C
Replies: 1
Views: 176

Re: 12.9 C

I think the proton transfer equation would be CH3COOH + NH3 -> CH3COO- + NH4+.
by EveEmm3D
Thu Dec 07, 2017 5:37 pm
Forum: Lewis Acids & Bases
Topic: Lewis Structure in identifying Acid or Base
Replies: 2
Views: 215

Re: Lewis Structure in identifying Acid or Base

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+,...
by EveEmm3D
Sun Dec 03, 2017 6:59 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH of neutral water and temperature
Replies: 2
Views: 195

Re: pH of neutral water and temperature

Yea but can anyone explain why?
by EveEmm3D
Sun Dec 03, 2017 6:56 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH of neutral water and temperature
Replies: 2
Views: 195

pH of neutral water and temperature

What effect does temperature have on the pH of neutral water?
by EveEmm3D
Sat Dec 02, 2017 3:10 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: coordination number/polydentates [ENDORSED]
Replies: 1
Views: 155

Re: coordination number/polydentates [ENDORSED]

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.
by EveEmm3D
Sun Nov 26, 2017 1:41 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 11.43
Replies: 1
Views: 190

Re: 11.43

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...
by EveEmm3D
Fri Nov 24, 2017 11:11 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homework 11.41
Replies: 1
Views: 333

Re: Homework 11.41

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...
by EveEmm3D
Sun Nov 19, 2017 4:49 pm
Forum: Naming
Topic: Hg(CH3)
Replies: 2
Views: 221

Re: Hg(CH3)

In the textbook! Page 743 at the bottom.
by EveEmm3D
Sun Nov 19, 2017 4:16 pm
Forum: Naming
Topic: Hg(CH3)
Replies: 2
Views: 221

Hg(CH3)

What does the (0) in the name of this compound, dimethylmercury(0), refer to ? Isn’t the oxidation of Hg 2+?
by EveEmm3D
Sun Nov 19, 2017 3:24 pm
Forum: Naming
Topic: Example 17.1
Replies: 2
Views: 211

Example 17.1

In part b of this example, how do we know that the oxidation state of Pt is 4+?
by EveEmm3D
Sun Nov 19, 2017 2:28 pm
Forum: Biological Examples
Topic: [Fe(NCS)(OH2)5]2+ name
Replies: 6
Views: 476

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

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 ?
by EveEmm3D
Sun Nov 19, 2017 2:25 pm
Forum: Biological Examples
Topic: [Fe(NCS)(OH2)5]2+ name
Replies: 6
Views: 476

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

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?
by EveEmm3D
Sun Nov 12, 2017 8:56 pm
Forum: Electronegativity
Topic: Determine Electron Affinity
Replies: 2
Views: 231

Re: Determine Electron Affinity

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...
by EveEmm3D
Sun Nov 12, 2017 6:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: ICl3 shape
Replies: 1
Views: 409

Re: ICl3 shape

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.
by EveEmm3D
Sat Nov 04, 2017 3:37 pm
Forum: Dipole Moments
Topic: Bond length [ENDORSED]
Replies: 4
Views: 349

Re: Bond length [ENDORSED]

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...
by EveEmm3D
Fri Nov 03, 2017 6:23 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge of Carbon in CH3
Replies: 2
Views: 4235

Re: Formal Charge of Carbon in CH3

C has two lone electrons, so FC = V - (L + S/2) = 4 - (2 +6/2) = -1
by EveEmm3D
Fri Nov 03, 2017 6:14 pm
Forum: Bond Lengths & Energies
Topic: Bond Strength
Replies: 5
Views: 499

Re: Bond Strength

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.
by EveEmm3D
Sat Oct 28, 2017 2:35 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron configuration for Fe^2+ [ENDORSED]
Replies: 2
Views: 267

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

It's because the 4s electrons are higher in energy and so they can be removed more easily than electrons from the 3d shell.
by EveEmm3D
Tue Oct 24, 2017 6:14 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Possible Quantum numbers given n=6
Replies: 3
Views: 277

Re: Possible Quantum numbers given n=6

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...
by EveEmm3D
Tue Oct 24, 2017 2:13 pm
Forum: Administrative Questions and Class Announcements
Topic: Weekly online discussion points
Replies: 3
Views: 308

Weekly online discussion points

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!
by EveEmm3D
Fri Oct 20, 2017 4:37 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Effective Nuclear Charge
Replies: 1
Views: 176

Re: Effective Nuclear Charge

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...
by EveEmm3D
Thu Oct 19, 2017 6:43 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Homework 2.29
Replies: 2
Views: 239

Re: Homework 2.29

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...
by EveEmm3D
Sun Oct 15, 2017 10:48 am
Forum: DeBroglie Equation
Topic: Units for Mass [ENDORSED]
Replies: 3
Views: 255

Re: Units for Mass [ENDORSED]

You have to convert to kg because the Planck constant is in units of J s and 1 J = kg m^2/ s^2.
by EveEmm3D
Thu Oct 12, 2017 8:06 pm
Forum: *Shrodinger Equation
Topic: Help on Self-Test 1.8A
Replies: 4
Views: 356

Re: Help on Self-Test 1.8A

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?
by EveEmm3D
Thu Oct 12, 2017 8:00 pm
Forum: Properties of Light
Topic: 1.27
Replies: 3
Views: 249

Re: 1.27

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.
by EveEmm3D
Thu Oct 12, 2017 7:38 pm
Forum: *Shrodinger Equation
Topic: Help on Self-Test 1.8A
Replies: 4
Views: 356

Re: Help on Self-Test 1.8A

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....
by EveEmm3D
Thu Oct 05, 2017 11:23 pm
Forum: Limiting Reactant Calculations
Topic: M9
Replies: 4
Views: 425

Re: M9

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!
by EveEmm3D
Thu Oct 05, 2017 7:57 pm
Forum: Limiting Reactant Calculations
Topic: M6
Replies: 1
Views: 220

Re: M6

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?

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