Search found 30 matches
- Thu Dec 06, 2018 7:00 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Naming Coordination compounds
- Replies: 1
- Views: 256
Naming Coordination compounds
can someone explain how you find the oxidation number of a metal in a complex compound?
- Thu Dec 06, 2018 6:58 pm
- Forum: Lewis Acids & Bases
- Topic: Ligands
- Replies: 7
- Views: 887
Ligands
Can someone explain what a neutral ligand is and some examples of it?
- Thu Dec 06, 2018 6:53 pm
- Forum: Conjugate Acids & Bases
- Topic: Conjugate Bases
- Replies: 7
- Views: 2541
Conjugate Bases
Can someone explain what conjugate bases and conjugate acids are?
- Mon Nov 26, 2018 9:19 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Homework question
- Replies: 4
- Views: 337
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.
- 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: 220
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.
- Mon Nov 26, 2018 9:08 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Textbook
- Replies: 3
- Views: 370
Re: Textbook
Yes just to confirm the comment above^^, we do use the same textbook we are using for 14A for 14B.
- Thu Nov 22, 2018 10:35 am
- Forum: Sigma & Pi Bonds
- Topic: Clarification of Pi Bonds and Rotation
- Replies: 3
- Views: 1132
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...
- Thu Nov 22, 2018 10:32 am
- Forum: Electronegativity
- Topic: electron density
- Replies: 4
- Views: 547
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.
- Thu Nov 22, 2018 10:27 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Sigma and Pi Bonds
- Replies: 3
- Views: 376
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
- Sat Nov 17, 2018 9:57 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sigma & Pi bonds
- Replies: 2
- Views: 222
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.
- Sat Nov 17, 2018 9:54 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Seesaw Shape
- Replies: 4
- Views: 394
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.
- Thu Nov 15, 2018 7:09 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular shapes
- Replies: 3
- Views: 400
Molecular shapes
Does anyone know any good tips that would help when remembering the molecular shapes and their angles.
- Sat Nov 10, 2018 4:22 pm
- Forum: Dipole Moments
- Topic: VSPER
- Replies: 8
- Views: 909
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"
- Sat Nov 10, 2018 4:18 pm
- Forum: Ionic & Covalent Bonds
- Topic: Iconic v Covalent Strength
- Replies: 4
- Views: 381
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.
- Sat Nov 10, 2018 4:14 pm
- Forum: Ionic & Covalent Bonds
- Topic: Polarizability
- Replies: 4
- Views: 467
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.
- Wed Oct 31, 2018 12:42 pm
- Forum: Ionic & Covalent Bonds
- Topic: 2A.23 7th edition (Chemical Formula)
- Replies: 3
- Views: 570
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+?
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+?
- Wed Oct 31, 2018 12:16 pm
- Forum: Ionic & Covalent Bonds
- Topic: 2A.17 7th edition
- Replies: 2
- Views: 317
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.
can someone explain the steps to solve this problem.
- Mon Oct 29, 2018 9:05 pm
- Forum: Ionic & Covalent Bonds
- Topic: 2A.11 7th Edition
- Replies: 1
- Views: 231
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.
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.
- Fri Oct 26, 2018 7:55 pm
- Forum: Properties of Light
- Topic: Speed of Light
- Replies: 12
- Views: 935
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.
- Fri Oct 26, 2018 7:49 pm
- Forum: Lewis Structures
- Topic: Lewis Structures vs. Line Structures
- Replies: 2
- Views: 242
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.
- Mon Oct 22, 2018 12:40 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Quantum world problem
- Replies: 1
- Views: 242
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...
- Thu Oct 18, 2018 4:16 pm
- Forum: Einstein Equation
- Topic: Number of photons
- Replies: 7
- Views: 1079
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...
- Thu Oct 18, 2018 4:11 pm
- Forum: Photoelectric Effect
- Topic: Light Absorbed by Electron
- Replies: 1
- Views: 211
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...
- 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: 221
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...
- Tue Oct 09, 2018 11:30 pm
- Forum: Properties of Light
- Topic: Photons
- Replies: 4
- Views: 144
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.
- Mon Oct 08, 2018 1:19 pm
- Forum: Einstein Equation
- Topic: calculating kinetic energy
- Replies: 5
- Views: 322
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?
M stands for the mass of the electron, is the unit for that mass suppose to be in grams or kilograms for this equation?
- Mon Oct 08, 2018 1:16 pm
- Forum: Photoelectric Effect
- Topic: Increasing photon energy [ENDORSED]
- Replies: 2
- Views: 358
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?
- Mon Oct 01, 2018 11:55 am
- Forum: Molarity, Solutions, Dilutions
- Topic: Question G13 page F59 7th edition [ENDORSED]
- Replies: 1
- Views: 154
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 ...
- Sun Sep 30, 2018 8:01 pm
- Forum: Balancing Chemical Reactions
- Topic: Short cuts/methods for balancing equations
- Replies: 15
- Views: 1627
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!
https://youtu.be/2Juem0lcifE
here is a link that helped me make balancing chemical equations easier for me. Hope it helps!
- Sun Sep 30, 2018 7:54 pm
- Forum: Student Social/Study Group
- Topic: 7 sets of problems?
- Replies: 5
- Views: 803
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...