Search found 30 matches

by Vikramjeet Gill 1C
Thu Dec 06, 2018 7:00 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Naming Coordination compounds
Replies: 1
Views: 61

Naming Coordination compounds

can someone explain how you find the oxidation number of a metal in a complex compound?
by Vikramjeet Gill 1C
Thu Dec 06, 2018 6:58 pm
Forum: Lewis Acids & Bases
Topic: Ligands
Replies: 7
Views: 272

Ligands

Can someone explain what a neutral ligand is and some examples of it?
by Vikramjeet Gill 1C
Thu Dec 06, 2018 6:53 pm
Forum: Conjugate Acids & Bases
Topic: Conjugate Bases
Replies: 7
Views: 282

Conjugate Bases

Can someone explain what conjugate bases and conjugate acids are?
by Vikramjeet Gill 1C
Mon Nov 26, 2018 9:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Homework question
Replies: 4
Views: 58

Re: Homework question

Because you want the formal charges to be as close to zero as possible and the structure with the double bonds puts every element with a formal charge of zero. And Xenon will often have more than 8 valence electrons around it so it works out.
by Vikramjeet Gill 1C
Mon Nov 26, 2018 9:12 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Ionic bonds and polarizing power
Replies: 1
Views: 52

Re: Ionic bonds and polarizing power

Ionic bonds have covalent characteristics because almost every ionic bond has a bonding region or distorted cloud, where the anions electron is pulled into the bonding region.
by Vikramjeet Gill 1C
Mon Nov 26, 2018 9:08 pm
Forum: Administrative Questions and Class Announcements
Topic: Textbook
Replies: 3
Views: 97

Re: Textbook

Yes just to confirm the comment above^^, we do use the same textbook we are using for 14A for 14B.
by Vikramjeet Gill 1C
Thu Nov 22, 2018 10:35 am
Forum: Sigma & Pi Bonds
Topic: Clarification of Pi Bonds and Rotation
Replies: 3
Views: 61

Re: Clarification of Pi Bonds and Rotation

Pi bonds are formed by the overlapping of two 'spare' p orbitals. This forms a flat bond above and below the sigma bond, this pi bond is only stable in one orientation and if there is any bond rotation then this bond breaks. Pi bonds prevents rotation because of the electron overlap both above and b...
by Vikramjeet Gill 1C
Thu Nov 22, 2018 10:32 am
Forum: Electronegativity
Topic: electron density
Replies: 4
Views: 105

Re: electron density

After you draw the lewis structure you can count the number of regions with high electron density which are the bonding pairs and unshared electron pairs around the central atom. Double and triple bonds count as one region of electron density.
by Vikramjeet Gill 1C
Thu Nov 22, 2018 10:27 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Sigma and Pi Bonds
Replies: 3
Views: 89

Re: Sigma and Pi Bonds

Bozeman science videos can be a very helpful resource to help learn complicated topics, especially if you need to visually see it. Just google Bozeman science and their should be lots of videos under the chemistry tab on the website
by Vikramjeet Gill 1C
Sat Nov 17, 2018 9:57 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma & Pi bonds
Replies: 2
Views: 51

Re: Sigma & Pi bonds

Pi bonds are usually weaker than sigma bonds since pi bonds happen when two atomic orbitals are in contact through two areas of overlap , like how in the lecture he showed how they are more spread out than sigma bonds.
by Vikramjeet Gill 1C
Sat Nov 17, 2018 9:54 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Seesaw Shape
Replies: 4
Views: 89

Re: Seesaw Shape

Yes all the bond angles would be less than 90,120,180 because the lone pair is more repulsive and the bond angles are pushed further away.
by Vikramjeet Gill 1C
Thu Nov 15, 2018 7:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular shapes
Replies: 3
Views: 90

Molecular shapes

Does anyone know any good tips that would help when remembering the molecular shapes and their angles.
by Vikramjeet Gill 1C
Sat Nov 10, 2018 4:22 pm
Forum: Dipole Moments
Topic: VSPER
Replies: 8
Views: 156

Re: VSPER

VSPER stands for valence shell electron pair repulsion, "it is used to predict the the geometry of individual molecules from the number of electron pairs surrounding their central atom"
by Vikramjeet Gill 1C
Sat Nov 10, 2018 4:18 pm
Forum: Ionic & Covalent Bonds
Topic: Iconic v Covalent Strength
Replies: 4
Views: 88

Re: Iconic v Covalent Strength

The attraction between oppositely charged ions tends to be stronger that a bond that results from the sharing of electrons.
by Vikramjeet Gill 1C
Sat Nov 10, 2018 4:14 pm
Forum: Ionic & Covalent Bonds
Topic: Polarizability
Replies: 4
Views: 85

Polarizability

Can someone explain the difference between polarizability and polarizing power to me, and what characteristics do you look for when you want to determine what elements have the highest polarizability or polarizing power. I am having a hard time grasping the concepts.
by Vikramjeet Gill 1C
Wed Oct 31, 2018 12:42 pm
Forum: Ionic & Covalent Bonds
Topic: 2A.23 7th edition (Chemical Formula)
Replies: 3
Views: 97

2A.23 7th edition (Chemical Formula)

On the basis of the expected charges on the monatomic ions, give the chemical formula of each of the following compounds;

I just need to know why the chemical formula for (c) aluminum hydride is = AlH3

I thought aluminum has a charge of 3+ and Hydrogen has a charge of 1+?
by Vikramjeet Gill 1C
Wed Oct 31, 2018 12:16 pm
Forum: Ionic & Covalent Bonds
Topic: 2A.17 7th edition
Replies: 2
Views: 75

2A.17 7th edition

Predict the number of valence electrons present for each of the following ions a)Mn^4+, c)Co^3+, d)P^3+

can someone explain the steps to solve this problem.
by Vikramjeet Gill 1C
Mon Oct 29, 2018 9:05 pm
Forum: Ionic & Covalent Bonds
Topic: 2A.11 7th Edition
Replies: 1
Views: 53

2A.11 7th Edition

Which M^3+ ions (where M is a metal) are predicted to have the following ground state electron configurations
a) [Ar]3d^6
b)[Ar]3d^5

I can't seem to understand how to solve these questions, can someone explain how they would get to the answer.
by Vikramjeet Gill 1C
Fri Oct 26, 2018 7:55 pm
Forum: Properties of Light
Topic: Speed of Light
Replies: 12
Views: 268

Re: Speed of Light

I don't believe so, nothing we know so far can travel faster than the speed of light. At least in the context of this course nothing travels faster than the speed of light.
by Vikramjeet Gill 1C
Fri Oct 26, 2018 7:49 pm
Forum: Lewis Structures
Topic: Lewis Structures vs. Line Structures
Replies: 2
Views: 39

Re: Lewis Structures vs. Line Structures

If you are referring to the lines Mr. Lavelle drew in lecture between the elements that were bounded together such as (C----C), the line just represents the covalent bond between the elements, 2e- per line.
by Vikramjeet Gill 1C
Mon Oct 22, 2018 12:40 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Quantum world problem
Replies: 1
Views: 63

Quantum world problem

An excited hydrogen atom emits light with a frequency of 1.14 x 1014 Hz to reach the energy level for which n=4. In what principle quantum level did the electron begin? Okay so I've looked up the answer for the problem and it is 6 but when I use the equation (n final = 4) E=-hR(1/n^2final - 1/n^2ini...
by Vikramjeet Gill 1C
Thu Oct 18, 2018 4:16 pm
Forum: Einstein Equation
Topic: Number of photons
Replies: 7
Views: 423

Re: Number of photons

To the best of my knowledge I don't believe you could calculate the number of photons emitted in a light source with that equation but you could calculate the energy each photon holds. You would need to be given the number of photons for example if a problem said 4.99x10^-19J/mole all you would have...
by Vikramjeet Gill 1C
Thu Oct 18, 2018 4:11 pm
Forum: Photoelectric Effect
Topic: Light Absorbed by Electron
Replies: 1
Views: 58

Light Absorbed by Electron

So I know that if the energy of the light does not match the Energy difference between n=1 and n=2 the light will not be absorbed but will the light be absorbed to push the electron to n=2 if the energy of the light is slightly more than the energy difference between n=1 and n=2 but not enough to re...
by Vikramjeet Gill 1C
Thu Oct 18, 2018 11:14 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1D.21 7th edition pg-41
Replies: 1
Views: 52

1D.21 7th edition pg-41

Write the subshell notation (3d for instance) and the number of orbitals having the following quantum numbers; a) n=5, l=2.......... Im having a little trouble understanding the vocabulary, what exactly is the orbital and sub shells and how do quantum number correlate with it? Can someone explain it...
by Vikramjeet Gill 1C
Tue Oct 09, 2018 11:30 pm
Forum: Properties of Light
Topic: Photons
Replies: 4
Views: 61

Re: Photons

If you are viewing the light as a wave increasing the intensity of the wave by increasing its amplitude does increase the amount of photons emitted but it does not increase the energy each photon holds.
by Vikramjeet Gill 1C
Mon Oct 08, 2018 1:19 pm
Forum: Einstein Equation
Topic: calculating kinetic energy
Replies: 5
Views: 82

calculating kinetic energy

For the equation Ek=1/2(M)(V^2)
M stands for the mass of the electron, is the unit for that mass suppose to be in grams or kilograms for this equation?
by Vikramjeet Gill 1C
Mon Oct 08, 2018 1:16 pm
Forum: Photoelectric Effect
Topic: Increasing photon energy [ENDORSED]
Replies: 2
Views: 69

Increasing photon energy [ENDORSED]

Im still confused on why a large wavelength of light is not able to eject e- from a metal. How does having a higher frequency increase the energy of the photons?
by Vikramjeet Gill 1C
Mon Oct 01, 2018 11:55 am
Forum: Molarity, Solutions, Dilutions
Topic: Question G13 page F59 7th edition [ENDORSED]
Replies: 1
Views: 53

Question G13 page F59 7th edition [ENDORSED]

im Having a little trouble calculating the moles of N atoms each plant will receive, I know the answer is 1.0x10^-2mole but I just don’t know how to get there. I’ve already calculated the number of moles in the new diluted solution of NH4NO3 which is 5.0x10^-3. Can anyone help with the last step. Q ...
by Vikramjeet Gill 1C
Sun Sep 30, 2018 8:01 pm
Forum: Balancing Chemical Reactions
Topic: Short cuts/methods for balancing equations
Replies: 15
Views: 201

Re: Short cuts/methods for balancing equations

Hey,
https://youtu.be/2Juem0lcifE
here is a link that helped me make balancing chemical equations easier for me. Hope it helps!
by Vikramjeet Gill 1C
Sun Sep 30, 2018 7:54 pm
Forum: Student Social/Study Group
Topic: 7 sets of problems?
Replies: 5
Views: 339

Re: 7 sets of problems?

If you go on his website you'll see a link under the title "Lecture Headlines" for this week you would click on the link for "outline 1 Review of chemical and physical principles" on that page you will find a list of problems that you could complete. But Professor Lavelle only as...

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