Search found 36 matches

by quresh3E
Sun Nov 17, 2019 5:27 pm
Forum: Bond Lengths & Energies
Topic: Strongest Bonds
Replies: 11
Views: 274

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).
by quresh3E
Sun Nov 17, 2019 5:23 pm
Forum: Octet Exceptions
Topic: Octet expansion
Replies: 6
Views: 154

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.
by quresh3E
Sun Nov 17, 2019 5:21 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 7
Views: 87

Re: Polarity

CCl4 has equal dipoles and no lone pairs so it should be nonpolar.
by quresh3E
Sun Nov 17, 2019 5:20 pm
Forum: Bond Lengths & Energies
Topic: Bond Strengths
Replies: 3
Views: 35

Re: Bond Strengths

Bonds strengths are transferrable for the molecule with the same atoms.
by quresh3E
Sun Nov 17, 2019 5:17 pm
Forum: Electronegativity
Topic: electronegativity
Replies: 5
Views: 140

Re: electronegativity

Nonpolar bonds don't have different electronegativities, whereas polar bonds do. For example, H20.
by quresh3E
Sun Nov 17, 2019 5:17 pm
Forum: Electronegativity
Topic: electronegativity
Replies: 5
Views: 140

Re: electronegativity

Nonpolar bonds don't have different electronegativities, whereas polar bonds do. For example, H20.
by quresh3E
Tue Nov 12, 2019 2:07 pm
Forum: Quantum Numbers and The H-Atom
Topic: n, l ,ml, ms
Replies: 13
Views: 431

Re: n, l ,ml, ms

If you write the electron configuration you can tell if there is a +1/2 or -1/2 spin.
by quresh3E
Tue Nov 12, 2019 2:05 pm
Forum: Photoelectric Effect
Topic: binding energy
Replies: 3
Views: 165

Re: binding energy

Yes, the binding energy refers to the threshold energy.
by quresh3E
Tue Nov 12, 2019 2:01 pm
Forum: *Shrodinger Equation
Topic: wave function
Replies: 3
Views: 128

Re: wave function

We don't need to know the wave function equations, just the four quantum numbers.
by quresh3E
Tue Nov 12, 2019 2:00 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Uncertainty in Position
Replies: 4
Views: 148

Re: Heisenberg Uncertainty in Position

If the range given is +/- 5 then the indeterminancy would be 5. You would have to multiply by two.
by quresh3E
Tue Nov 12, 2019 1:59 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Midterm
Replies: 6
Views: 189

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.
by quresh3E
Sun Nov 03, 2019 11:52 pm
Forum: Resonance Structures
Topic: Resonance structures
Replies: 6
Views: 127

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.
by quresh3E
Sun Nov 03, 2019 11:50 pm
Forum: Dipole Moments
Topic: drawing dipole moments
Replies: 5
Views: 67

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.
by quresh3E
Sun Nov 03, 2019 11:47 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge
Replies: 16
Views: 147

Re: Formal charge

The added formal charges of the atoms should be zero. With whatever negative formal charges being on the most electronegative atom.
by quresh3E
Sun Nov 03, 2019 11:46 pm
Forum: Octet Exceptions
Topic: Octet Exceptions
Replies: 7
Views: 99

Re: Octet Exceptions

Expanded Octet- 3rd row and bellow.
Incomplete Octet- First 5 elements and column under Al.
by quresh3E
Sun Nov 03, 2019 11:44 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent
Replies: 14
Views: 172

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.
by quresh3E
Sun Oct 27, 2019 11:46 pm
Forum: Electronegativity
Topic: Trend of Electronegativity
Replies: 18
Views: 2855

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.
by quresh3E
Sun Oct 27, 2019 11:41 pm
Forum: Octet Exceptions
Topic: Resonance structures
Replies: 5
Views: 48

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.
by quresh3E
Sun Oct 27, 2019 11:40 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 7
Views: 99

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...
by quresh3E
Sun Oct 27, 2019 11:36 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 14
Views: 131

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.
by quresh3E
Sun Oct 27, 2019 11:33 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 14
Views: 131

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.
by quresh3E
Sun Oct 20, 2019 10:41 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg
Replies: 5
Views: 54

Re: Heisenberg

What exactly is momentum?
by quresh3E
Sun Oct 20, 2019 10:39 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Exceptions to Orbital Rules
Replies: 8
Views: 107

Re: Exceptions to Orbital Rules

What does that mean when he said they were half shell and full shell?
by quresh3E
Sun Oct 20, 2019 10:33 pm
Forum: *Particle in a Box
Topic: Midterm
Replies: 17
Views: 1643

Re: Midterm

The midterm is on Wednesday, November 6th.
by quresh3E
Sun Oct 20, 2019 10:33 pm
Forum: *Shrodinger Equation
Topic: Application
Replies: 1
Views: 37

Re: Application

I recommend looking at the example in the book. It is super helpful!
by quresh3E
Sun Oct 20, 2019 10:30 pm
Forum: Photoelectric Effect
Topic: Work Function
Replies: 9
Views: 143

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?
by quresh3E
Sun Oct 13, 2019 7:55 pm
Forum: Quantum Numbers and The H-Atom
Topic: Atomic Spectra
Replies: 5
Views: 54

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.
by quresh3E
Sun Oct 13, 2019 7:50 pm
Forum: Photoelectric Effect
Topic: Question from module
Replies: 5
Views: 63

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?
by quresh3E
Sun Oct 13, 2019 7:47 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect and Photons
Replies: 6
Views: 57

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?
by quresh3E
Sun Oct 13, 2019 7:41 pm
Forum: Photoelectric Effect
Topic: ejecting electons
Replies: 6
Views: 70

Re: ejecting electons

Why is the equation for kinetic energy 1/2me*ve^2?
by quresh3E
Sun Oct 13, 2019 7:39 pm
Forum: Photoelectric Effect
Topic: Video Modules
Replies: 7
Views: 61

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.
by quresh3E
Sun Oct 06, 2019 6:35 pm
Forum: Limiting Reactant Calculations
Topic: Two Limiting Reactants
Replies: 5
Views: 4451

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.
by quresh3E
Sun Oct 06, 2019 6:32 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Reactions
Replies: 25
Views: 564

Re: Balancing Reactions

In what types of questions would we have to specify the state (s,g,l)of the product or reactant?
by quresh3E
Sun Oct 06, 2019 6:30 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Reactions
Replies: 25
Views: 564

Re: Balancing Reactions

Is there a particular order we have to list our products and reactants?
by quresh3E
Sun Oct 06, 2019 6:29 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactant Tips
Replies: 4
Views: 108

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?
by quresh3E
Sun Oct 06, 2019 6:26 pm
Forum: Limiting Reactant Calculations
Topic: limiting reactant
Replies: 9
Views: 203

Re: limiting reactant

What is the best way to find the limiting reactant when all of the reactants have coefficients above 1?

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