Search found 76 matches

by Artin Allahverdian 2H
Sun Mar 17, 2019 11:26 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius equation
Replies: 2
Views: 186

Re: Arrhenius equation

Thanks, that makes sense
by Artin Allahverdian 2H
Sun Mar 17, 2019 11:22 am
Forum: Second Order Reactions
Topic: Termolecular
Replies: 1
Views: 173

Termolecular

What is termolecular?
by Artin Allahverdian 2H
Sun Mar 17, 2019 11:00 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius equation
Replies: 2
Views: 186

Arrhenius equation

How would we know when exactly to use the Arrhenius equation?
by Artin Allahverdian 2H
Sun Mar 17, 2019 10:20 am
Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
Topic: What are the steps in the process of of rusting?
Replies: 1
Views: 171

Re: What are the steps in the process of of rusting?

Rust is when iron is exposed to water, causing Fe to oxidize into Fe2+. Water acts as the oxidizing agent for Fe so the dissolved ions present in water are what get reduced. The more dissolved ions in water, the faster rust happens.
by Artin Allahverdian 2H
Sun Mar 17, 2019 10:18 am
Forum: Calculating Work of Expansion
Topic: Reversible vs irreversible
Replies: 2
Views: 192

Re: Reversible vs irreversible

It is more a question of whether the process itself is reversible. The problem will usually tell u if it is reversible or irreversible. If it is reversible, deltaS of the system will equal the negative of deltaS of surroundings. Work itself is based on if the rxn is isothermal, in which deltaU is 0 ...
by Artin Allahverdian 2H
Sun Mar 17, 2019 9:35 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: pKa and pKb
Replies: 4
Views: 210

pKa and pKb

If we are given the acid and it’s pKa, but we want to solve for the pH of its base, do we need to convert pKa to pKb?
by Artin Allahverdian 2H
Sat Mar 16, 2019 7:35 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Relation between Q and Gibbs Free Energy
Replies: 4
Views: 204

Re: Relation between Q and Gibbs Free Energy

To clarify if Q>K the reaction would want to shift in the reverse way to make more reactants in order to reach K. Since this will make the reverse rxn more favorable than the forward rxn, the forward rxn will not be spontaneous, and thus, delta G is 0.
by Artin Allahverdian 2H
Sat Mar 16, 2019 7:33 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Relation between Q and Gibbs Free Energy
Replies: 4
Views: 204

Re: Relation between Q and Gibbs Free Energy

Greater than 0 because it will be non spontaneous
by Artin Allahverdian 2H
Sat Mar 16, 2019 5:20 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Inclusion of ions in the cell diagram
Replies: 1
Views: 45

Inclusion of ions in the cell diagram

How do we know when to include the ions playing a part in the reaction, but that don’t get oxidized or reduced, such as H+, OH-, or any other ion into the cell diagram?
by Artin Allahverdian 2H
Sat Mar 16, 2019 5:10 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6L7 c 7th edition
Replies: 1
Views: 33

6L7 c 7th edition

Why does the solutions manual throw in KOH into the anode portion of the cell diagram when K plays no part of the reaction??
by Artin Allahverdian 2H
Sat Mar 16, 2019 5:09 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6L7 b 7th edition
Replies: 1
Views: 27

6L7 b 7th edition

Ok so I have no idea what is going on with this redox reaction. It doesn’t look like any species is oxidized or reduced, and I’m having trouble following the solutions manual when it balances the half reactions. Can someone please explain this one?
by Artin Allahverdian 2H
Sun Mar 10, 2019 11:04 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Units of k
Replies: 7
Views: 224

Units of k

Why are the units of k different between different reaction orders ?
by Artin Allahverdian 2H
Wed Mar 06, 2019 4:28 pm
Forum: Zero Order Reactions
Topic: Example of a zero order rxn
Replies: 4
Views: 92

Example of a zero order rxn

What would be an example of a zero order reaction? I’m having some trouble understanding what it means conceptually.
by Artin Allahverdian 2H
Sun Mar 03, 2019 1:55 pm
Forum: General Rate Laws
Topic: unique rate
Replies: 2
Views: 31

unique rate

What is meant by the "unique" rate of a reaction?
by Artin Allahverdian 2H
Sun Mar 03, 2019 1:50 pm
Forum: General Rate Laws
Topic: Initial reaction rates
Replies: 2
Views: 34

Initial reaction rates

Why do we mostly just focus on the initial reaction rates as opposed to the rate later in the reaction?
by Artin Allahverdian 2H
Sat Mar 02, 2019 10:50 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Reaction order
Replies: 3
Views: 59

Reaction order

What exactly does the reaction order mean?
by Artin Allahverdian 2H
Tue Feb 12, 2019 10:25 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Delta U
Replies: 2
Views: 60

Delta U

How do we know when delta U is zero given the context of a problem?
by Artin Allahverdian 2H
Tue Feb 12, 2019 9:28 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Calculating entropy for a has given a temperature change
Replies: 1
Views: 42

Calculating entropy for a has given a temperature change

How do you know when to use deltaS=nRln(T2/T1) versus deltaS=nCln(T2/T1) whenever a gas goes through a temperature change?
by Artin Allahverdian 2H
Tue Feb 12, 2019 5:35 pm
Forum: Phase Changes & Related Calculations
Topic: Slope of heating curve
Replies: 8
Views: 282

Slope of heating curve

Why does a higher heat capacity mean a less steep slope?
by Artin Allahverdian 2H
Thu Feb 07, 2019 11:46 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Reversible vs irreversible
Replies: 3
Views: 84

Reversible vs irreversible

What exactly is meant by a “reversible” process or an “irreversible” process in the context of thermodynamics?
by Artin Allahverdian 2H
Wed Feb 06, 2019 3:24 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 3R/2 vs 5R/2
Replies: 1
Views: 40

3R/2 vs 5R/2

When calculating q for an ideal monatomic gas with the equation q=nCdeltaT, how do we know when to use 5R/2 versus 3R/2 for C?
by Artin Allahverdian 2H
Wed Feb 06, 2019 2:58 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: nR vs kb in entropy equations (lecture 2/6)
Replies: 1
Views: 34

Re: nR vs kb in entropy equations (lecture 2/6)

kb (the Boltzmann constant) is equal to R (the gas constant) divided by Avogadro’s number. Basically, this relates the energy level for each particle.
by Artin Allahverdian 2H
Wed Feb 06, 2019 2:44 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Isothermal reaction
Replies: 3
Views: 95

Isothermal reaction

What exactly is the difference between an isothermal reaction and a non isothermal reaction?
by Artin Allahverdian 2H
Sun Feb 03, 2019 9:27 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Friday 02/01/2019 lecture
Replies: 2
Views: 65

Friday 02/01/2019 lecture

Hello, I was absent for the Friday 02/01/2019 lecture and was wondering if anyone could share the notes of what we learned in lecture that day. Thanks!
by Artin Allahverdian 2H
Sun Jan 27, 2019 10:17 pm
Forum: Phase Changes & Related Calculations
Topic: State properties
Replies: 3
Views: 49

State properties

I am kind of confused as to what constitutes a state property. Can someone give an example explaining what does and doesn't constitute a state property? Thanks!
by Artin Allahverdian 2H
Sun Jan 27, 2019 10:14 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy H(r)
Replies: 1
Views: 38

Re: Enthalpy H(r)

Although a phase change does not change in temperature, energy is still inputted into the system in order to break the inter-molecular forces between molecules. There is much more energy required for a phase change from a liquid to gas than there is for a phase change from solid to liquid, so when y...
by Artin Allahverdian 2H
Wed Jan 23, 2019 9:51 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ACIDS AND BASES: What to do with very dilute acid
Replies: 2
Views: 48

Re: ACIDS AND BASES: What to do with very dilute acid

I believe if we come out with any concentration for H3O+ that is smaller than 10^-7 we should still consider it as slightly acidic but very close to neutral since we know that autoprotolysis generates 10^-7 mol/L of H3O+, so it wouldnt make sense of our H3O+ concentration was less than that. If we d...
by Artin Allahverdian 2H
Mon Jan 21, 2019 10:02 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Chemical Equilibrium part 4 post module assessment question #12
Replies: 2
Views: 44

Chemical Equilibrium part 4 post module assessment question #12

For #12, why does an increase in pressure on the system not cause a shift in neither the reactants nor products side?
by Artin Allahverdian 2H
Thu Jan 17, 2019 8:17 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 11.21 7th edition
Replies: 1
Views: 40

Re: 11.21 7th edition

U can solve for pH given the pOH given the following equation:

pH+pOH=14.
pH=14-pOH

When u solve for pH then u can find the molarity of the substance using this equation:

-log[concentration of substance]=pH
concentration of substance=10^(-pH)
by Artin Allahverdian 2H
Mon Jan 14, 2019 8:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Temperature and the equilibrium constant
Replies: 2
Views: 46

Temperature and the equilibrium constant

Why does a change in temperature result in a change in the equilibrium constant for a reaction? Is temperature the only thing that can alter the equilibrium constant or are there other variables that can affect it as well?
by Artin Allahverdian 2H
Thu Jan 10, 2019 2:19 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Explaining Q<K and Q>K [ENDORSED]
Replies: 7
Views: 157

Re: Explaining Q<K and Q>K [ENDORSED]

First, remember that Q=[products]/[reactants] at an instantaneous given time not at equilibrium. So when Q<K, it indicates that there is a higher concentration of reactants in the denominator than for the ratio for K, thus resulting in a smaller number for Q. Since we want the reaction to proceed to...
by Artin Allahverdian 2H
Thu Jan 10, 2019 2:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 7th Edition 5.H.3
Replies: 1
Views: 43

7th Edition 5.H.3

Can someone explain why we have to multiply the 2 K values together when combining the 2 separate reactions together as opposed to adding them?
by Artin Allahverdian 2H
Mon Jan 07, 2019 9:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Heterogeneous equilibrium
Replies: 3
Views: 60

Heterogeneous equilibrium

Lets say we have a chemical reaction at equilibrium where one of products/reactants is a gas and another one of the products/reactants is aqueous. When calculating the equilibrium constant for a specific case like this, would we just use the concentration of the aqueous reactant/product and the part...
by Artin Allahverdian 2H
Sun Dec 09, 2018 12:33 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Strong/weak acids and bases
Replies: 2
Views: 82

Strong/weak acids and bases

How would we be able to tell if a given acid/base is strong or weak?
by Artin Allahverdian 2H
Sat Dec 08, 2018 10:41 am
Forum: Amphoteric Compounds
Topic: HW problem 6.21 (7th edition)
Replies: 1
Views: 201

HW problem 6.21 (7th edition)

In this question why can the nitrogens accept protons, but not the oxygens? In general, how can we tell if an atom/molecule can accept a proton or not?
by Artin Allahverdian 2H
Fri Dec 07, 2018 9:11 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate
Replies: 11
Views: 268

Polydentate

How can we tell if a ligand is polydentate so that we know whether to use bis-, tris-, tetrakis-, etc?
by Artin Allahverdian 2H
Fri Dec 07, 2018 4:45 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Polyprotic acids
Replies: 1
Views: 104

Polyprotic acids

Why is Ka1>Ka2>Ka3?
by Artin Allahverdian 2H
Fri Dec 07, 2018 1:09 pm
Forum: Bond Lengths & Energies
Topic: Bond strength & resonance structures
Replies: 2
Views: 224

Re: Bond strength & resonance structures

Oh I almost forgot. Since the resonance bonds are longer than a double bond but shorter than a single bond, they will be stronger than a single bond, but weaker than a double bond, since bond length is inversely proportional to bond strength.
by Artin Allahverdian 2H
Fri Dec 07, 2018 1:07 pm
Forum: Bond Lengths & Energies
Topic: Bond strength & resonance structures
Replies: 2
Views: 224

Re: Bond strength & resonance structures

Say you have a resonance molecule that has 3 bonding pairs and 2 are single bonds and one is a double bond. However, we can move around that double bond to the other bonding pair positions to form 3 resonance structures. In the real world, the bonds of resonance structures are the average of the res...
by Artin Allahverdian 2H
Tue Dec 04, 2018 5:14 pm
Forum: Naming
Topic: Which nonmetal do we name first if the ligand has 2 of them?
Replies: 1
Views: 15

Which nonmetal do we name first if the ligand has 2 of them?

If a conplex ion has 2 nobmetals in it, how do we know which one we name first? For example in [Co(NH3)5(SO4)]+, which nonmetal will we name first?
by Artin Allahverdian 2H
Mon Dec 03, 2018 1:04 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Oxoacids
Replies: 1
Views: 24

Oxoacids

What causes oxoacids to be stronger acids if the atom that O is bonded to is more electronegative?
by Artin Allahverdian 2H
Sun Dec 02, 2018 11:32 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: “Soapy” feel of bases
Replies: 5
Views: 265

“Soapy” feel of bases

Dr. Lavelle refers to bases as having a “soapy” feel. Why is it exactly that causes bases to feel this way and what is its significance?
by Artin Allahverdian 2H
Sun Dec 02, 2018 11:30 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Calculating
Replies: 2
Views: 74

Calculating

Are we supposed to know how to calculate pH for acids and bases? If so, how is it calculated?
by Artin Allahverdian 2H
Sun Dec 02, 2018 11:26 pm
Forum: Naming
Topic: Metal Suffix
Replies: 2
Views: 58

Re: Metal Suffix

-ate is added as a suffix to the transition metal if the whole ligand itself has an overall negative charge.
by Artin Allahverdian 2H
Sun Dec 02, 2018 11:24 pm
Forum: Naming
Topic: Transition Metal in naming
Replies: 2
Views: 45

Re: Transition Metal in naming

I think that’s just how it is because it makes turning the compound into a single, long word easier that way than having the metal name come first.
by Artin Allahverdian 2H
Wed Nov 28, 2018 10:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 5
Views: 90

Re: Polarity

The NO2 Lewis structure has a central N atom that is double bonded to one oxygen and single bonded to another oxygen. Since this molecule has an odd number of valence electrons (17), it is a free radical, in which N will have a lone, unpaired electron. This unpaired electron acts as a lone pair, pus...
by Artin Allahverdian 2H
Wed Nov 28, 2018 10:06 pm
Forum: Hybridization
Topic: Sulfur Trioxide Hybridization
Replies: 4
Views: 498

Re: Sulfur Trioxide Hybridization

If you look at the Lewis structure of this molecule, a central S atom is bonded to 3 O atoms. Each S-O bond is a double bond, and S has no lone pairs. Thus, S has 3 regions of electron density (a double bond counts as a single region of electron density, and there are 3 of them, hence 3 regions of e...
by Artin Allahverdian 2H
Wed Nov 28, 2018 9:56 pm
Forum: Biological Examples
Topic: acids
Replies: 5
Views: 82

acids

Why is it that we can ingest vinegar, but if it is poured into a cut, it hurts?
by Artin Allahverdian 2H
Mon Nov 26, 2018 8:52 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: 46

Ionic bonds and polarizing power

Can someone please review how ionic bonds can have covalent character and how certain cations can form ionic bonds with more polarizing power and thus more covalent character?
by Artin Allahverdian 2H
Mon Nov 26, 2018 12:55 pm
Forum: Biological Examples
Topic: Chelating compounds
Replies: 2
Views: 52

Chelating compounds

Can someone please explain why chelating compounds can form multiple bonds with the same metal, and why just any other coordination compound cannot do the same?
by Artin Allahverdian 2H
Tue Nov 20, 2018 5:51 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Homework
Replies: 2
Views: 113

Homework

Can someone please explain 2F5 letters b and c (7th edition) in the homework? I am having a hard time understanding the whole hybridization concept, so I’d be quite grateful if someone could summarize it for me. Thanks!
by Artin Allahverdian 2H
Mon Nov 12, 2018 9:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Last Friday 11/09/18 lecture
Replies: 2
Views: 55

Last Friday 11/09/18 lecture

Does anyone have the notes for last Friday’s lecture? Thanks.
by Artin Allahverdian 2H
Wed Nov 07, 2018 8:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Wednesday 11/07/2018 lecture notes
Replies: 1
Views: 48

Wednesday 11/07/2018 lecture notes

Hello, I missed the lecture today due to traveling for athletics and I was wondering if someone could provide me with the notes. I would also appreciate if someone can send me a link to the bruincast video for this lecture (if it exists). Thanks!
by Artin Allahverdian 2H
Mon Nov 05, 2018 6:56 am
Forum: Ionic & Covalent Bonds
Topic: Ionic character [ENDORSED]
Replies: 5
Views: 106

Re: Ionic character [ENDORSED]

I think for a question like this he would have to give you the electronegativity values just because it is hard to decipher the electronegativity comparisons just by looking at the periodic trends.
by Artin Allahverdian 2H
Sat Nov 03, 2018 9:18 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic character [ENDORSED]
Replies: 5
Views: 106

Ionic character [ENDORSED]

Why is CF4 more ionic than CH4? To me it seems that the electronegativity difference is more between C and H than between C and F just because H is farther from C than F is. Is there something else that I didn’t put into account?
by Artin Allahverdian 2H
Sat Nov 03, 2018 4:44 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: PROBLEM 1A.15 (7th edition)
Replies: 2
Views: 278

PROBLEM 1A.15 (7th edition)

In this question it says that the emission of energy leads to the spectral line at 102.6 nm for the wavelength. If there is an emission of energy, then doesn’t that mean that the energy goes from a higher energy level to an lower energy level? If that is the case, then why does the answer say that t...
by Artin Allahverdian 2H
Fri Nov 02, 2018 1:17 pm
Forum: Ionic & Covalent Bonds
Topic: electronegativity troughout a covalent bond
Replies: 3
Views: 96

electronegativity troughout a covalent bond

So remember how in covalent bonds the electrons aren't shared perfectly equally so one atom is slightly positive and the other is slightly negative? Is the atom that is slightly more negative the one that is more electronegative?
by Artin Allahverdian 2H
Fri Nov 02, 2018 1:09 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Tungsten
Replies: 2
Views: 40

Re: Tungsten

I don't have that answer to that, but id like to know why as well
by Artin Allahverdian 2H
Wed Oct 31, 2018 1:01 pm
Forum: Resonance Structures
Topic: General guideline for drawing structures
Replies: 4
Views: 149

Re: General guideline for drawing structures

For the easy structures u will not have to do much work since there are no exceptions. However for resonance, u can tell because the molecule will be the same just with the double bond occurring in either side. Calculate the formal charge just to make sure it is resonance. For the free radical eleme...
by Artin Allahverdian 2H
Tue Oct 30, 2018 8:29 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Cu2+ configuration
Replies: 2
Views: 61

Cu2+ configuration

Can someone please explain why the electron configuration for Cu2+ is [Ar]3d^9 and not [Ar]3d^8 4s^1? Thanks!
by Artin Allahverdian 2H
Sun Oct 28, 2018 3:18 pm
Forum: Ionic & Covalent Bonds
Topic: Friday 10/26/18 lecture
Replies: 4
Views: 95

Friday 10/26/18 lecture

Hello, I was absent for Friday’s lecture and I was wondering if anyone could give me a thorough recap of what Dr. Lavelle talked about. Thanks!
by Artin Allahverdian 2H
Wed Oct 24, 2018 11:53 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Pauli Exclusion Principle vs. Hund's Rule
Replies: 2
Views: 121

Re: Pauli Exclusion Principle vs. Hund's Rule

The Pauli Exclusion Principle states that there can be no more than 2 electrons per orbital. For an orbital that has the full amount of 2 electrons, they must be spin paired, meaning one spins up while the other spins down. Hunds rules states that electrons in the same sub shell occupy different orb...
by Artin Allahverdian 2H
Wed Oct 24, 2018 11:32 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: wavelength/frequency impact on determinacy?
Replies: 2
Views: 89

Re: wavelength/frequency impact on determinacy?

I also forgot that u asked about frequency. If frequency increases then wavelength decreases since wavelength*frequency=the speed of light, where the speed of light is a constant. Thus, if frequency decreases the wavelength increases. Now that you know what happened to wavelength, then you can use t...
by Artin Allahverdian 2H
Wed Oct 24, 2018 11:30 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: wavelength/frequency impact on determinacy?
Replies: 2
Views: 89

Re: wavelength/frequency impact on determinacy?

If the indeterminacy in wavelength increases, then the indeterminacy in momentum will decrease since by the de Broglie relationship (wavelength=h/p) wavelength and momentum are inversely proportional to each other. Thus, if the indeterminacy in momentum decreases, then the indeterminacy in position ...
by Artin Allahverdian 2H
Wed Oct 24, 2018 11:05 am
Forum: Trends in The Periodic Table
Topic: Electronegativaty
Replies: 2
Views: 40

Re: Electronegativaty

*To clarify I meant why does chromium like it’s 3d orbitals half full while copper likes it to be completely full?
by Artin Allahverdian 2H
Wed Oct 24, 2018 11:03 am
Forum: Trends in The Periodic Table
Topic: Electronegativaty
Replies: 2
Views: 40

Electronegativaty

Why is it that the exception elements Chromium and Copper take an electron from the 4s orbital and toss it into the 3d orbital? I know it is because they don’t want to have the 5th 3d orbital to be empty, since they like all of them to be half full, but I guess the extent of my question goes to why ...
by Artin Allahverdian 2H
Mon Oct 22, 2018 1:13 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: s, p, d, f subshells in multi-electron atoms
Replies: 6
Views: 144

Re: s, p, d, f subshells in multi-electron atoms

@ bonnie_schmitz_3K

Actually, 3d comes before 4s, given that 4s is fully occupied, because 3d has a lower energy state than 4s.
by Artin Allahverdian 2H
Fri Oct 19, 2018 1:09 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: s, p, d, f subshells in multi-electron atoms
Replies: 6
Views: 144

s, p, d, f subshells in multi-electron atoms

What exactly is it that causes an s-electron to have lower energy than a p-electron in the same shell?
by Artin Allahverdian 2H
Thu Oct 18, 2018 10:26 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation
Replies: 2
Views: 62

Rydberg equation

If an electron jumping to higher energy levels indicates that there is more positive energy, then why is the value for E sub n in the Rydberg equation still a negative value?
by Artin Allahverdian 2H
Thu Oct 18, 2018 7:18 pm
Forum: Student Social/Study Group
Topic: Need notes for 10/17
Replies: 2
Views: 101

Re: Need notes for 10/17

We learned about the Schrodinger wave function. We can use a wave function Ψ (psi) to describe an electron with wavelike properties and indeterminacy in position and momentum. Ψ represents the height of the wave @ position x, y, z. Ψ^2 represents the probability of finding an electron. the wave func...
by Artin Allahverdian 2H
Wed Oct 17, 2018 5:06 pm
Forum: *Shrodinger Equation
Topic: Schrodinger's Equation Confused
Replies: 1
Views: 66

Re: Schrodinger's Equation Confused

I'd say you are right on. Perhaps to add a little more, the Schrodinger equation we are learning about, H(psi)=E(psi), is time independent. The time-independent equation considers the electron's quantum state to not be changing, and thus considers the electron to be a standing wave. Also, to be put ...
by Artin Allahverdian 2H
Tue Oct 16, 2018 11:10 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: subshells & orbitals
Replies: 1
Views: 55

subshells & orbitals

Can someone please explain how we write the subshell notation and the number of orbitals, given the quantum numbers n, l, and/or m?

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