Search found 9 matches

by 704597525
Wed Feb 10, 2016 11:07 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneous Reaction or Physical Change
Replies: 1
Views: 375

Spontaneous Reaction or Physical Change

On page 39 of our course reader, we are given a table of the sign of the change in enthalpy and the sign of the change in entropy. If the signs are both positive they are spontaneous at a high temp. If they are both negative they are spontaneous at a low temp. What is the cut off temperatures for th...
by 704597525
Tue Jan 19, 2016 10:46 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Open vs Closed System
Replies: 1
Views: 249

Open vs Closed System

In lecture, Lavelle commented on the fact that work is a reversible process because the system is at equilibrium. Obviously this is true for closed systems but does this also apply to open systems as well?
by 704597525
Fri Nov 20, 2015 7:50 pm
Forum: Naming
Topic: -ate ending
Replies: 2
Views: 509

-ate ending

Hi everyone! When looking at the course reader on page 106, the bottom compound has the name potassium-hexa-fluoro-cobaltate (III). I know that you use the -ate ending when the overall charge of the compound is negative but from what I see K3[CoF6] is an overall neutral charge. Am I missing somethin...
by 704597525
Fri Nov 13, 2015 2:21 pm
Forum: Naming
Topic: Ligand Definition
Replies: 1
Views: 204

Ligand Definition

During lecture, Lavelle said that a land is a species bound to a transition metal and can only be attached by a lone pair. Does this mean that ligands are only applicable to transition metals and if so what are the bonds of metals and nonmetals called?
by 704597525
Fri Nov 06, 2015 2:19 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: MO Diagram Rules
Replies: 2
Views: 477

MO Diagram Rules

When Lavelle talked in lecture, he discussed the idea that the MO Diagram is different for an atomic number of 8 or lower versus an atomic number of 8 or high. What is the difference and what diagram do we use for oxygen since it is 8 and the breaking point number?
by 704597525
Fri Oct 30, 2015 6:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electric Dipole Moment
Replies: 1
Views: 430

Electric Dipole Moment

When looking at our course reader, I notice that there is a formal to calculate electric dipole moment: Charge (q) x distance between atoms (d) However I have no examples of how to calculate this or how to get the values required to compute the answer. Are these values given or do they have to deriv...
by 704597525
Wed Oct 14, 2015 12:49 am
Forum: Lewis Structures
Topic: Lewis Structure- Expanded Octate
Replies: 1
Views: 268

Lewis Structure- Expanded Octate

Hi everyone!
In lecture, Professor Lavelle drew Sulfur with what he called an expanded octace. How can we decipher what elements are available for the extra octave and how does this change sulfurs (or any elements for that matter) properties?
Thank you!
by 704597525
Fri Oct 09, 2015 2:23 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect- Extra Energy
Replies: 1
Views: 332

Photoelectric Effect- Extra Energy

Hi everyone. I have a question regarding the photoelectric effect and where the excess energy goes. In the equation, it says E(Photon) - E(Energy Remove e-) = E(EXCESS) = Ek (e-) Is the excess energy the electron and I am just totally missing the point or does the excess energy contribute to somethi...
by 704597525
Thu Oct 01, 2015 10:09 pm
Forum: Balancing Chemical Reactions
Topic: Clarifying the State of the Reactants and Products
Replies: 4
Views: 760

Clarifying the State of the Reactants and Products

In my high school chemistry class, I was not required to clarify whether the reactants and products I was working with was a gas, liquid, aqueous, or solid. Now, when approaching any chemical equation in this class they are all noted. Is this something important and needs to be included. Obviously I...

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