Search found 36 matches
- Sun Nov 17, 2019 5:27 pm
- Forum: Bond Lengths & Energies
- Topic: Strongest Bonds
- Replies: 11
- Views: 915
Re: Strongest Bonds
The order from strongest bonds to least strong bonds are ion-ion, ion-dipole, dipole-dipole (which include H-bonding), induced dipole-dipole, and induced-dipole induced-dipole (van der waals/london dispersion forces).
- Sun Nov 17, 2019 5:23 pm
- Forum: Octet Exceptions
- Topic: Octet expansion
- Replies: 6
- Views: 560
Re: Octet expansion
I don't think that the atoms with an expanded octet necessarily have to have 10 electrons. However, you should always make sure that your lewis structure with the atom with an expanded octet has the same amount of electrons as the amount you calculated prior.
- Sun Nov 17, 2019 5:21 pm
- Forum: Dipole Moments
- Topic: Polarity
- Replies: 7
- Views: 473
Re: Polarity
CCl4 has equal dipoles and no lone pairs so it should be nonpolar.
- Sun Nov 17, 2019 5:20 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Strengths
- Replies: 3
- Views: 275
Re: Bond Strengths
Bonds strengths are transferrable for the molecule with the same atoms.
- Sun Nov 17, 2019 5:17 pm
- Forum: Electronegativity
- Topic: electronegativity
- Replies: 5
- Views: 456
Re: electronegativity
Nonpolar bonds don't have different electronegativities, whereas polar bonds do. For example, H20.
- Sun Nov 17, 2019 5:17 pm
- Forum: Electronegativity
- Topic: electronegativity
- Replies: 5
- Views: 456
Re: electronegativity
Nonpolar bonds don't have different electronegativities, whereas polar bonds do. For example, H20.
- Tue Nov 12, 2019 2:07 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: n, l ,ml, ms
- Replies: 13
- Views: 1522
Re: n, l ,ml, ms
If you write the electron configuration you can tell if there is a +1/2 or -1/2 spin.
- Tue Nov 12, 2019 2:05 pm
- Forum: Photoelectric Effect
- Topic: binding energy
- Replies: 3
- Views: 400
Re: binding energy
Yes, the binding energy refers to the threshold energy.
- Tue Nov 12, 2019 2:01 pm
- Forum: *Shrodinger Equation
- Topic: wave function
- Replies: 3
- Views: 375
Re: wave function
We don't need to know the wave function equations, just the four quantum numbers.
- Tue Nov 12, 2019 2:00 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Heisenberg Uncertainty in Position
- Replies: 4
- Views: 410
Re: Heisenberg Uncertainty in Position
If the range given is +/- 5 then the indeterminancy would be 5. You would have to multiply by two.
- Tue Nov 12, 2019 1:59 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Midterm
- Replies: 6
- Views: 532
Re: Midterm
For the midterm and for the final, I believe that it is best to learn the concepts of the experiments and the names associated to them.
- Sun Nov 03, 2019 11:52 pm
- Forum: Resonance Structures
- Topic: Resonance structures
- Replies: 6
- Views: 530
Re: Resonance structures
It is basically many different lewis structures drawn for the same molecule, in which the double bonds differ. However, the total charge for all the resonance structures should be the same.
- Sun Nov 03, 2019 11:50 pm
- Forum: Dipole Moments
- Topic: drawing dipole moments
- Replies: 5
- Views: 670
Re: drawing dipole moments
The main way to tell is if the molecule is asymmetric. You should take the formal charges and draw the S+ and S- accordingly on the atoms. Also, draw arrows to the most electronegative atoms.
- Sun Nov 03, 2019 11:47 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge
- Replies: 16
- Views: 939
Re: Formal charge
The added formal charges of the atoms should be zero. With whatever negative formal charges being on the most electronegative atom.
- Sun Nov 03, 2019 11:46 pm
- Forum: Octet Exceptions
- Topic: Octet Exceptions
- Replies: 7
- Views: 432
Re: Octet Exceptions
Expanded Octet- 3rd row and bellow.
Incomplete Octet- First 5 elements and column under Al.
Incomplete Octet- First 5 elements and column under Al.
- Sun Nov 03, 2019 11:44 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic vs Covalent
- Replies: 14
- Views: 895
Re: Ionic vs Covalent
A main distinction between covalent and ionic bonds are that ionic bonds are between a metal and nonmetal. Covalent bonds are between two nonmetals. Additionally, the EN difference for ionic bonds are greater than 2.5 and lower than 1.5 for covalent bonds.
- Sun Oct 27, 2019 11:46 pm
- Forum: Electronegativity
- Topic: Trend of Electronegativity
- Replies: 18
- Views: 4249
Re: Trend of Electronegativity
chrisavalos-2L wrote:I was wondering what the trend for electronegativity was, is it the same as ionization energy?
I remember my TA mentioning that it is okay to view them as having the same trends.
- Sun Oct 27, 2019 11:41 pm
- Forum: Octet Exceptions
- Topic: Resonance structures
- Replies: 5
- Views: 284
Re: Resonance structures
Katherine Chhen 3I wrote:For a compound, would the best way to represent it in Lewis structures is to draw out every structure and use double headed arrows?
You have to draw all of the possible Lewis structures and then figure out which one has the formal charge closest to zero.
- Sun Oct 27, 2019 11:40 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 7
- Views: 453
Re: Formal Charge
The resonance structure with the lowest formal change is the most stable. I thought the structure with its formal charge = 0 or closest to 0 was the most stable? You are correct. The structure with the formal charge closest to zero is most stable since that would result in it having no charge of th...
- Sun Oct 27, 2019 11:36 pm
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 14
- Views: 665
Re: Electronegativity
Jorge Ramirez_4H wrote:Is electronegativity important when doing electron configurations?
For electron configurations, you don't really need to know about how electronegative the atom is. It may be more beneficial to know about where it lies in the periodic table in terms of the s,p, and d blocks.
- Sun Oct 27, 2019 11:33 pm
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 14
- Views: 665
Re: Electronegativity
Electronegativity is the ability of an atom to attract a shared pair of electrons. The electronegativity increases as it goes along a period because the atomic number increases, thus increasing the number of protons. The protons make the atom more positive, making it more attracted to electrons.
- Sun Oct 20, 2019 10:41 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Heisenberg
- Replies: 5
- Views: 259
Re: Heisenberg
What exactly is momentum?
- Sun Oct 20, 2019 10:39 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Exceptions to Orbital Rules
- Replies: 8
- Views: 1426
Re: Exceptions to Orbital Rules
What does that mean when he said they were half shell and full shell?
- Sun Oct 20, 2019 10:33 pm
- Forum: *Particle in a Box
- Topic: Midterm
- Replies: 17
- Views: 4271
Re: Midterm
The midterm is on Wednesday, November 6th.
- Sun Oct 20, 2019 10:33 pm
- Forum: *Shrodinger Equation
- Topic: Application
- Replies: 1
- Views: 188
Re: Application
I recommend looking at the example in the book. It is super helpful!
- Sun Oct 20, 2019 10:30 pm
- Forum: Photoelectric Effect
- Topic: Work Function
- Replies: 9
- Views: 646
Re: Work Function
If the total energy of the photon was equal to the work function, and the kinetic energy was zero, then is the electron ejected? How can the electron be ejected if there is no kinetic energy?
- Sun Oct 13, 2019 7:55 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Atomic Spectra
- Replies: 5
- Views: 178
Re: Atomic Spectra
Each atom absorbs and emits its own specific amount of energy or quanta. The amount absorbed always equals the amount emitted. However, black bodies can absorb all frequencies.
- Sun Oct 13, 2019 7:50 pm
- Forum: Photoelectric Effect
- Topic: Question from module
- Replies: 5
- Views: 209
Re: Question from module
I worked backwards and solved for the wavelength then inputted it into the E=H*C/v equation. Why is this wrong?
- Sun Oct 13, 2019 7:47 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect and Photons
- Replies: 6
- Views: 275
Re: Photoelectric Effect and Photons
The professor stated that if the energy per photon is greater or equal to the energy needed to remove an electron only then would the increase in light intensity result in more elected e-s. What exactly does this mean?
- Sun Oct 13, 2019 7:41 pm
- Forum: Photoelectric Effect
- Topic: ejecting electons
- Replies: 6
- Views: 230
Re: ejecting electons
Why is the equation for kinetic energy 1/2me*ve^2?
- Sun Oct 13, 2019 7:39 pm
- Forum: Photoelectric Effect
- Topic: Video Modules
- Replies: 7
- Views: 352
Re: Video Modules
I find it super beneficial to watch the modules and do the homework problems right after so then you can apply the concepts just learned.
- Sun Oct 06, 2019 6:35 pm
- Forum: Limiting Reactant Calculations
- Topic: Two Limiting Reactants
- Replies: 5
- Views: 9769
Re: Two Limiting Reactants
It is highly unlikely that two reagents would be at the molar specific ratio to be both the limiting reagents. So there are almost never two limiting reactants.
- Sun Oct 06, 2019 6:32 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing Reactions
- Replies: 25
- Views: 2170
Re: Balancing Reactions
In what types of questions would we have to specify the state (s,g,l)of the product or reactant?
- Sun Oct 06, 2019 6:30 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing Reactions
- Replies: 25
- Views: 2170
Re: Balancing Reactions
Is there a particular order we have to list our products and reactants?
- Sun Oct 06, 2019 6:29 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactant Tips
- Replies: 4
- Views: 375
Re: Limiting Reactant Tips
If you balance the equation and the product has a coefficient that is above 1, would that change the process of finding the limiting reactant?
- Sun Oct 06, 2019 6:26 pm
- Forum: Limiting Reactant Calculations
- Topic: limiting reactant
- Replies: 9
- Views: 582
Re: limiting reactant
What is the best way to find the limiting reactant when all of the reactants have coefficients above 1?