Search found 22 matches

by Shrita Pendekanti 4B
Fri Mar 11, 2016 4:08 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Thermodynamic Stability
Replies: 1
Views: 260

Thermodynamic Stability

What does it mean for reactants/products to be thermodynamically stable?
by Shrita Pendekanti 4B
Sat Mar 05, 2016 7:33 pm
Forum: Administrative Questions and Class Announcements
Topic: Video Competition
Replies: 66
Views: 24408

Re: Video Competition

This is the error message we are getting when we try to upload. What should we do?
by Shrita Pendekanti 4B
Fri Mar 04, 2016 3:31 pm
Forum: *Cyclopropanes and Cyclobutanes
Topic: Bond Angle Strain vs. Torsional Strain
Replies: 8
Views: 1305

Re: Bond Angle Strain vs. Torsional Strain

Torsional strain is caused by electron repulsion between neighboring atoms while bond angle strain is caused when bond angles disagree with the ideal orientation of the molecule. Hope this helps!
by Shrita Pendekanti 4B
Mon Feb 29, 2016 6:46 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Partial Charges
Replies: 4
Views: 559

Re: Partial Charges

Oh ok, so then a greater difference in electronegativity would cause partial charges?
by Shrita Pendekanti 4B
Fri Feb 26, 2016 11:53 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Partial Charges
Replies: 4
Views: 559

Re: Partial Charges

Ok, so if they are close in electronegativity, then the electrons will be more shared, giving the atoms partial rather than complete charges?
by Shrita Pendekanti 4B
Fri Feb 26, 2016 11:45 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Partial Charges
Replies: 4
Views: 559

Partial Charges

Can someone please clarify how we know when atoms in a molecule should have partial charges? Thanks!
by Shrita Pendekanti 4B
Fri Feb 19, 2016 12:17 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Pre-Equilibrium Approach
Replies: 1
Views: 300

Re: Pre-Equilibrium Approach

The objective of step 2 is to write the rate law of the rate-determining step (slow step) in a manner that agrees with the experimentally derived rate law. To do this, you must substitute the intermediate with something else that's present in the experimental rate law. So, you're substituting the in...
by Shrita Pendekanti 4B
Wed Feb 10, 2016 3:56 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Midterm Winter 2014 Q. 7 and 8
Replies: 2
Views: 470

Re: Midterm Winter 2014 Q. 7 and 8

I believe that for this specific question, you are able to figure out which is the anode because it asks for the Ka value. Ka is the acid dissociation constant and therefore, H+ must be a product. So, it is part of the anode reaction.
by Shrita Pendekanti 4B
Fri Feb 05, 2016 9:34 am
Forum: Balancing Redox Reactions
Topic: Remember Oxidation vs. Reduction
Replies: 1
Views: 328

Remember Oxidation vs. Reduction

Just thought I'd share this helpful way to remember how to distinguish oxidation from reduction: OIL RIG

Oxidation
Is
Loss (of electrons)

Reduction
Is
Gain (of electrons)

:)
by Shrita Pendekanti 4B
Thu Jan 28, 2016 6:38 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: q and w in a reversible process
Replies: 1
Views: 347

q and w in a reversible process

Does q necessarily equal -w in a reversible process?
by Shrita Pendekanti 4B
Thu Jan 28, 2016 6:32 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: How to draw a heating curve?
Replies: 3
Views: 1520

Re: How to draw a heating curve?

Also make sure the length of your horizontal line is proportional to how much heat should be supplied, and that your slopes accurately represent the different heat capacities (smaller heat capacities will have steeper slopes because less energy needs to be absorbed for the temperature to rise).
by Shrita Pendekanti 4B
Thu Jan 21, 2016 4:56 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Relating q, w, U, and H
Replies: 1
Views: 351

Relating q, w, U, and H

I would really appreciate an explanation of how q, w, U, and H are related. Some specifics I would like answered: When exactly does q = -w and why? Why does q = delta U when volume is constant? And why does q = delta H when pressure is constant?

Thank you so much!
by Shrita Pendekanti 4B
Sat Jan 16, 2016 12:03 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs at Constant Pressure
Replies: 1
Views: 583

Gibbs at Constant Pressure

Is Gibbs Free Energy at a constant pressure always 0? I figured since ΔH= q at a constant pressure and ΔS = q/t that substituting these terms into the Gibbs free equation ΔG = ΔH - TΔS would become ΔG = q-T(q/t) = q - q = 0. I am wondering if someone can explain if this is correct, why this is the c...
by Shrita Pendekanti 4B
Sun Jan 10, 2016 7:00 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 1
Views: 263

Re: Hess's Law

You should be able cancel out the intermediate terms by manipulating one of the steps in the process so that the molecule you wish to cancel is present in an equal number of moles on the opposite side of the reaction equation in some other step. This way, the terms cancel out when the steps are adde...
by Shrita Pendekanti 4B
Fri Jan 08, 2016 11:43 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: heat and state function
Replies: 2
Views: 324

Re: heat and state function

A state function describes the equilibrium state of a system. In this case, enthalpy describes a thermodynamic system, irrespective of the paths each part of the system took to arrive at its current state. Heat is not a state function because it is a form of energy being transitioned as a cause of c...
by Shrita Pendekanti 4B
Sun Nov 22, 2015 9:54 pm
Forum: Photoelectric Effect
Topic: Video:Crash Course on Photoelectric Effect and Others
Replies: 2
Views: 440

Video:Crash Course on Photoelectric Effect and Others

Chem14A.m4v Intended to be an all-encompassing study tool, our video begins with an explanation of balancing chemical equations, followed by the basics of the photoelectric effect, Heisenberg's uncertainty principle, molecular shape and structure, molecular orbital theory, and naming coordination c...
by Shrita Pendekanti 4B
Tue Oct 27, 2015 11:38 am
Forum: Lewis Structures
Topic: ClO2 Lewis Structure
Replies: 3
Views: 2362

Re: ClO2 Lewis Structure

I believe this is the answer because a structure that includes a radical is not supposed to be of the lowest energy possible. But rather, that unpaired electron is there to make bonds with another atom, which is more likely to happen if Cl has only 2 single bonds and thus has not filled its octet.
by Shrita Pendekanti 4B
Thu Oct 22, 2015 8:39 pm
Forum: Lewis Structures
Topic: Bonds
Replies: 2
Views: 415

Re: Bonds

One of the most important things to look at when drawing Louis Structures is the formal charge of each atom. Doing this should help you figure out which bond will provide for the most stable structure. (Stability is essentially based on filling necessary octets in the most energy efficient manner.)
by Shrita Pendekanti 4B
Thu Oct 22, 2015 8:26 pm
Forum: Octet Exceptions
Topic: Expanded Octet
Replies: 9
Views: 1500

Re: Expanded Octet

It helps to think of it like they have d-orbitals "available" since they are in the third energy level (n=3 so l=2), but they just don't need to occupy these orbitals given the number of electrons they have.
by Shrita Pendekanti 4B
Sat Oct 10, 2015 9:16 pm
Forum: Properties of Light
Topic: Heisenberg's Equation
Replies: 3
Views: 624

Re: Heisenberg's Equation

Heisenberg's Indeterminacy Equation actually either allows you to calculate the uncertainty in position (delta x) or the uncertainty in momentum (delta p). The probability of finding the electron's location can be found by squaring the wavelength function.
by Shrita Pendekanti 4B
Sun Oct 04, 2015 4:54 pm
Forum: *Shrodinger Equation
Topic: Conceptual Explanation of Schrod. Equ. Pls!
Replies: 1
Views: 427

Conceptual Explanation of Schrod. Equ. Pls!

I'm having trouble understanding the verbal form of Schrodinger's Equation: "Operate a change on psi (x,y,z) = Energy psi (x,y,z)"

What does the operation of a change on an electron entail and why does it equal its energy?
by Shrita Pendekanti 4B
Sun Oct 04, 2015 3:57 pm
Forum: Properties of Electrons
Topic: Speed of an Electron (hw 1.43)
Replies: 6
Views: 2263

Re: Speed of an Electron (hw 1.43)

So to solve this problem, you first use Heisenberg's Indeterminacy Equation, which looks like the following: Delta p x Delta x >= h/(4pi) The question gives us the uncertainty in position (Delta x) by stating the diameter of the lead atom, 350 pm. Because we want to keep our units to meters, we make...

Go to advanced search