Search found 19 matches

by Emma Boyles 1L
Wed Dec 06, 2017 2:30 am
Forum: Hybridization
Topic: how to determine hybridization
Replies: 4
Views: 231

Re: how to determine hybridization

Hybridization is determined by regions of electron density and how many regions there are. This includes lone pairs where VSEPR doesn't so hybridization is not based completely on VSEPR. Knowing an atom's electron config. can help determine if there are unhybridized p orbitals remaining that can for...
by Emma Boyles 1L
Wed Dec 06, 2017 2:28 am
Forum: Hybridization
Topic: sp2 hybridization
Replies: 5
Views: 243

Re: sp2 hybridization

There are three regions of electron density around BF3 making it sp2 hybridized as hybridization is determined by the number of regions of electron density around that atom. The one s orbital and 2/3 of the p orbitals are used in the hybridization. The third p orbital remains unhybridized. Hope this...
by Emma Boyles 1L
Thu Nov 30, 2017 11:28 pm
Forum: Naming
Topic: Chromium as a cation
Replies: 2
Views: 168

Chromium as a cation

Chromium as an anion is denoted chromate in a coordination compound but what do you write when it is a cation? Chromide?
by Emma Boyles 1L
Thu Nov 30, 2017 11:26 pm
Forum: Naming
Topic: 17.31D
Replies: 1
Views: 156

Re: 17.31D

This is corrected in the solution manual errors!
by Emma Boyles 1L
Sun Nov 19, 2017 3:54 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Multiple Oxidation States
Replies: 1
Views: 105

Multiple Oxidation States

Why can a transition metal like Fe have both a 2+ and a 3+ oxidation state? Does it prefer to be in one state over the other?
by Emma Boyles 1L
Sun Nov 19, 2017 3:50 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Equatorial vs Axial [ENDORSED]
Replies: 3
Views: 192

Re: Equatorial vs Axial [ENDORSED]

If you picture an octahedral style molecule: The four atoms sticking out from the sides of the central atom are the equatorial atoms because they are on the equator of the molecule like the equator is around the middle of the Earth. The axial atoms are the two atoms sticking above and below the cent...
by Emma Boyles 1L
Sun Nov 12, 2017 12:21 pm
Forum: Dipole Moments
Topic: When do dipole moments occur?
Replies: 3
Views: 325

When do dipole moments occur?

How do you know if the difference in electronegativity between the atoms in a covalent bond is enough to create a dipole moment?
by Emma Boyles 1L
Sun Nov 12, 2017 12:17 pm
Forum: Electronegativity
Topic: Electronegativity and electron affinity
Replies: 3
Views: 198

Re: Electronegativity and electron affinity

Electronegativity is how much an atom can draw an electron to itself and it is a calculated value. Electron affinity is a measure of how much energy is released when an electron is added to an atom. The more energy released, the more favorable or the higher the electron affinity is of that atom beca...
by Emma Boyles 1L
Thu Nov 02, 2017 1:43 pm
Forum: Lewis Structures
Topic: 3.19 e
Replies: 2
Views: 182

3.19 e

For Chapter 3 #19 e):

Why is the electron configuration for Ni 2+ [Ar]3d8 instead of [Ar]3d6 4s2?
by Emma Boyles 1L
Wed Nov 01, 2017 7:21 pm
Forum: Lewis Structures
Topic: Electron Configurations
Replies: 2
Views: 156

Re: Electron Configurations

In both cases, electrons will be taken from the 4s orbital first because the 4s orbital actually has a lower energy level than 3d. It is easier to remove an electron from the 4s orbital than the 3d orbital.

Therefore, the metals would stay Co and Fe but acquire a 2+ charge.
by Emma Boyles 1L
Wed Nov 01, 2017 7:12 pm
Forum: Bond Lengths & Energies
Topic: Bond Length
Replies: 5
Views: 276

Re: Bond Length

I think bond length is always a given value because we have no way to calculate it.
by Emma Boyles 1L
Wed Oct 25, 2017 11:37 pm
Forum: Properties of Light
Topic: Homework?
Replies: 2
Views: 199

Re: Homework?

I think everything after #41 on the Quantum World outline is homework for this week.
by Emma Boyles 1L
Wed Oct 25, 2017 1:11 pm
Forum: *Shrodinger Equation
Topic: Next Test [ENDORSED]
Replies: 2
Views: 226

Next Test [ENDORSED]

Is the Schrodinger equation and all of the wave function stuff (including probability density, etc.) going to be on the next test? (10/31 or 11/3) Or can someone specify what sections of the book we will be tested on?

Thank you!
by Emma Boyles 1L
Tue Oct 17, 2017 3:03 pm
Forum: Einstein Equation
Topic: Use of symbols
Replies: 6
Views: 638

Re: Use of symbols

I would stick to what symbols are used on the equation sheet we are given.
by Emma Boyles 1L
Tue Oct 17, 2017 2:56 pm
Forum: Properties of Light
Topic: Converting Units [ENDORSED]
Replies: 11
Views: 529

Re: Converting Units [ENDORSED]

If it relates to wavelength, I think it's best to put it in nanometers.
by Emma Boyles 1L
Thu Oct 12, 2017 12:47 am
Forum: Properties of Light
Topic: Work Functions
Replies: 4
Views: 268

Re: Work Functions

The equation you can use in this case:

E(photon) - work function = kinetic energy of ejected electron

hv - Φ = (1/2)mv^2

(planck's constant x frequency) - (threshold energy) = ((1/2) mass of electron x velocity of electron^2)
by Emma Boyles 1L
Thu Oct 12, 2017 12:43 am
Forum: Properties of Light
Topic: Balmer Vs. Lyman
Replies: 12
Views: 816

Re: Balmer Vs. Lyman

I think Balmer series applies when an electron is moving from higher energy levels to the second energy level, n =2. That's why n1 = 2.
Lyman series applies when an electron is moving from higher energy levels to the first energy level, n= 1. So n1 = 1.
by Emma Boyles 1L
Thu Oct 05, 2017 12:15 am
Forum: Molarity, Solutions, Dilutions
Topic: Question L.35
Replies: 2
Views: 216

Re: Question L.35

The problem involves going through each reaction and calculating the mass of Fe in steps. First, you have to balance each of the three chemical rxns. Then, you can calculate the number of moles you have of NaBr using its molar mass. Using the bottom chemical equation, determine how many moles of Fe3...
by Emma Boyles 1L
Wed Oct 04, 2017 11:50 pm
Forum: General Science Questions
Topic: Sig Figs
Replies: 9
Views: 856

Re: Sig Figs

Even though the molar masses may have 4 sigfigs, I think you only need 3 sigfigs in your final answer. Hope that helps!

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