Search found 17 matches

by DanielLee3H
Sat Mar 18, 2017 3:39 am
Forum: *Electrophiles
Topic: Is carbon monoxide an electrophile
Replies: 1
Views: 1438

Is carbon monoxide an electrophile

Carbon monoxide has a double bond and lone pairs on the oxygen, but the oxygen pulls strongly on the carbon making the partial positive charge large. But wouldn't it also have a strong negative charge?
by DanielLee3H
Fri Mar 17, 2017 2:01 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell potential
Replies: 1
Views: 318

Cell potential

What does it mean conceptually that voltage difference does not depend on how many times the reaction occurs? I understand that standard cell potential is a state function, and that you don't multiply the cell potential by the coefficient but why? I figured that if the reaction goes on for longer, t...
by DanielLee3H
Thu Mar 16, 2017 12:50 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy at equilibrium pt2
Replies: 2
Views: 348

Re: Entropy at equilibrium pt2

This is what I think happens, please correct if I'm wrong. When you form bonds spontaneously, the bonds release energy that goes into the system and increases the thermal entropy at a magnitude greater than the decrease in residual entropy, for an overall increase in entropy. When an unstable bond b...
by DanielLee3H
Wed Mar 15, 2017 11:33 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy at equilibrium pt2
Replies: 2
Views: 348

Entropy at equilibrium pt2

I'm still a little confused as to why entropy is at its maximum at equilibrium. I get that mathematically or like according to the laws this makes sense. But conceptually, don't certain reactions that combine two molecules together have less degeneracy even if its spontaneous. Doesn't that make entr...
by DanielLee3H
Mon Mar 13, 2017 1:09 am
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Strains
Replies: 2
Views: 431

Strains

Just to clarify, Steric strains are high in energy due to the instability caused by the physical presence of multiple atoms in a limited area, while torsional strains are caused by repulsion between electron dense clouds of hydrogens when eclipsed? Isn't that essentially the same thing?
by DanielLee3H
Sat Mar 04, 2017 10:26 pm
Forum: *ChemDraw
Topic: Curved arrow [ENDORSED]
Replies: 1
Views: 619

Curved arrow [ENDORSED]

What exactly does the curved arrow mean when it starts at a single bond and points to an atom or molecule? I get that the bond is breaking and forming around the new atom but does each atom bonded originally take one of the electrons (so does it like split down the middle?). Or do both electrons tha...
by DanielLee3H
Wed Feb 22, 2017 2:17 am
Forum: General Rate Laws
Topic: I has question
Replies: 1
Views: 212

I has question

If the rate function doesn't match the overall reaction in terms of coefficients, you know that there have to be intermediate steps that don't show up in the overall reaction right? And the rate function is based on the slow intermediate step?
by DanielLee3H
Sun Feb 19, 2017 7:16 pm
Forum: General Rate Laws
Topic: Deriving the differential rate law
Replies: 2
Views: 291

Re: Deriving the differential rate law

Oh oops. Thank you. Also, the method of initial rates and the integrated rate law are different ways to find the reaction constant. Do they just give you different ways of modeling the reaction rate? And you can use both to find any reaction rate, whether it is the slow step or the overall reaction?
by DanielLee3H
Sun Feb 19, 2017 6:18 pm
Forum: General Rate Laws
Topic: Deriving the differential rate law
Replies: 2
Views: 291

Deriving the differential rate law

How did we get from the general rate equation (-1/a)*d[A]/dt to the differential rate law k[R]^n?
by DanielLee3H
Tue Feb 14, 2017 11:11 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Book problem 14.15
Replies: 1
Views: 315

Book problem 14.15

I have no idea how to even approach these.

Do we have to just know the half reactions of these formulas or that you have to add KOH to the cell in part c?
by DanielLee3H
Tue Feb 14, 2017 7:08 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs free energy question
Replies: 3
Views: 424

Gibbs free energy question

Why does gibbs free energy not depend on internal energy, but rather just enthalpy. Basically, why does gibbs free energy not include the energy of work as part of its function?
by DanielLee3H
Tue Feb 14, 2017 6:15 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Thermodynamic vocabulary
Replies: 3
Views: 496

Thermodynamic vocabulary

Does isothermal always mean the system is isolated? And does that mean it's always going to be reversible? Because isothermal can also be in a irreversible reaction if number of moles is what is changing right? But in that case then pressure would be constant making it irreversible? So does Isotherm...
by DanielLee3H
Sat Feb 11, 2017 11:13 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: I am confusion about cell potential. [ENDORSED]
Replies: 1
Views: 256

I am confusion about cell potential. [ENDORSED]

I thought cell potential decreased as the reaction takes place because of the anode consumption and electrons building up in the cathode part of the galvanic cell. But it says that cell potential is an intensive property and does not depend on how many times the reaction occurs, which is why we don'...
by DanielLee3H
Sun Jan 29, 2017 4:32 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constants
Replies: 1
Views: 345

Equilibrium Constants

Why is a higher K, or more products than reactants, favorable? Meaning negative delta G*?
by DanielLee3H
Sat Jan 28, 2017 6:40 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Entropy at equilibrium
Replies: 1
Views: 288

Entropy at equilibrium

I still don't really understand conceptually why at equilibrium, when energy is at its minimum, entropy is at its maximum? Don't things get more ordered when they get lower in energy?
by DanielLee3H
Mon Jan 23, 2017 12:11 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Systems at equilibrium [ENDORSED]
Replies: 1
Views: 285

Systems at equilibrium [ENDORSED]

Is the reason that systems at equilibrium release energy slowly but more efficiently than a sudden release of energy be related to something like taking the intergral over an infinite number of time steps versus taking larger changes in time?
by DanielLee3H
Sun Jan 15, 2017 9:50 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat capacity
Replies: 1
Views: 268

Heat capacity

Why does heat capacity increase with molecular complexity? Does molecular complexity mean just number of molecules or number of bonds in a molecule?

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