Search found 33 matches

by cgarcia
Fri Mar 14, 2014 11:49 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Trans vs. Cis
Replies: 1
Views: 606

Trans vs. Cis

I understand that a trans a,a chair conformation is less stable than a trans e,e chair conformation and that a cis a,e chair conformation is just as stable as a cis e,a chair conformation, but out of curiosity are the cis chair conformations (both a,e and e,a) in between those chair conformations in...
by cgarcia
Fri Mar 14, 2014 11:14 am
Forum: *Ethers
Topic: How to name ethers?
Replies: 5
Views: 1090

Re: How to name ethers?

Is there a case when you would have "-oxyl"?
by cgarcia
Fri Mar 14, 2014 11:03 am
Forum: *Alkanes
Topic: When to use...
Replies: 6
Views: 874

Re: When to use...

Would it be accurate to think of tert- as having the "cross" at the start of the substituent and neo- as having the "cross" at the end of the substituent?
by cgarcia
Sun Mar 09, 2014 7:53 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Newman Projections for Cyclohexanes
Replies: 4
Views: 1863

Re: Newman Projections for Cyclohexanes

Thank you guys so much! This helped a lot!
by cgarcia
Sat Mar 08, 2014 12:31 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Newman Projections for Cyclohexanes
Replies: 4
Views: 1863

Newman Projections for Cyclohexanes

So I was experimenting with the molecular structure model kit and was able to build both the boat and chair conformations for cyclohexane. However, I was confused as to why either of these conformations are considered stable since looking down each of the bonds, a gauche configuration appears. Does ...
by cgarcia
Tue Feb 25, 2014 6:02 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: to determine the overall reaction
Replies: 6
Views: 1833

Re: to determine the overall reaction

why is it that for the overall rate law we can leave in the concentration of OH-; shouldn't it be written off somehow because it's an intermediate?
by cgarcia
Sun Feb 09, 2014 9:34 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Trends in Cell (Redox) Potentials
Replies: 3
Views: 1778

Re: Trends in Cell (Redox) Potentials

Ah I see now! Thank you so much!!!
by cgarcia
Sat Feb 08, 2014 1:15 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: G = RTlnP
Replies: 2
Views: 2821

Re: G = RTlnP

I suppose what I’m really asking is why we are able to use the equation G= G° + (RTlnP - RTlnP°) in our derivation of the equation ΔG° = -RTlnK; where does the first equation derive from?
by cgarcia
Sat Feb 08, 2014 1:10 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Trends in Cell (Redox) Potentials
Replies: 3
Views: 1778

Trends in Cell (Redox) Potentials

On page 531, the text makes the statement that "the most negative [standard reduction potentials]...are usually found toward the left of the periodic table, and the most positive...are found toward the upper right." But the elements found on the left of the periodic table often have positi...
by cgarcia
Thu Feb 06, 2014 5:51 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: G = RTlnP
Replies: 2
Views: 2821

G = RTlnP

In lecture on Monday 1/27, we were given the equation G = G° + RTln(P/P°) as part of our derivation of the equation ΔG° = -RTlnK. I understand that another way to phrase the equation we were given is G = G° + (RTlnP - RTlnP°). This leads me to believe that G = RTlnP and I’m wondering where this equa...
by cgarcia
Thu Feb 06, 2014 5:34 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs' Free Energy Dependence on Constant T and Constant P
Replies: 1
Views: 405

Gibbs' Free Energy Dependence on Constant T and Constant P

Why is the equation for Gibbs free energy (G=H-TS) dependent on the conditions of constant temperature and constant pressure?
by cgarcia
Mon Jan 27, 2014 11:52 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Standard States of Entropies
Replies: 1
Views: 376

Standard States of Entropies

Why is it that the standard entropies of substances are those measured at 1 bar instead of 1 atm? I know that the ratio between bar and atm is practically 1, but why is bar used instead of atm?
by cgarcia
Mon Jan 27, 2014 11:50 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Standard Molar Entropies
Replies: 2
Views: 1209

Re: Standard Molar Entropies

There was also a section on page 306 in the textbook that mentioned the effect mass has on standard molar entropies. Specifically it says that "...the greater the mass of the molecules, the closer together are the energy levels." These energy levels are more "thermally accessible"...
by cgarcia
Mon Jan 27, 2014 10:39 pm
Forum: Calculating Work of Expansion
Topic: Reversible work VS Irreversible work
Replies: 5
Views: 665

Re: Reversible work VS Irreversible work

Why do you say that a reversible process involves no entropy production?
by cgarcia
Mon Jan 27, 2014 7:40 pm
Forum: Calculating Work of Expansion
Topic: Reversible work VS Irreversible work
Replies: 5
Views: 665

Re: Reversible work VS Irreversible work

Would the only way to have a reversible process to have an isothermal situation? Would the only irreversible process be one in which you have constant pressure and a change in volume?
by cgarcia
Fri Jan 24, 2014 10:02 am
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: Stability of a Perfect Crystal
Replies: 3
Views: 624

Re: Stability of a Perfect Crystal

But what about the fact that entropy is zero as well at that point; wouldn't that imply that there's instability?
by cgarcia
Thu Jan 23, 2014 10:42 am
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: Stability of a Perfect Crystal
Replies: 3
Views: 624

Stability of a Perfect Crystal

Say you have a perfect crystal cooled down to 0 Kelvin. I understand that S=0 at this point since there is no atomic movement or vibration and that U=0 since there is no heat or work to supply internal energy. As I understand, the Entropy Maximization Principle implies that since S=0, the system is ...
by cgarcia
Sun Jan 19, 2014 9:19 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: The Relationship Between Entropy and Stability
Replies: 1
Views: 11227

The Relationship Between Entropy and Stability

From what I understand, a system is stable and at equilibrium when (1) internal energy is at its minimum and (2) entropy is at its maximum. Does this fact arise from Gibb’s free energy equation ΔG= ΔH-TΔS which would imply that a positive change in entropy would lead to a more negative change of Gib...
by cgarcia
Thu Nov 21, 2013 10:51 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Determining what is a chelate
Replies: 2
Views: 537

Re: Determining what is a chelate

How exactly does the cis and trans arrangement determine if a polydentate will form a chelating complex?
by cgarcia
Thu Nov 21, 2013 7:07 pm
Forum: Naming
Topic: Am I alphabetizing Wrong
Replies: 5
Views: 870

Re: Am I alphabetizing Wrong

So any of the methods of writing the ligands is will be seen as correct on the quiz?
by cgarcia
Mon Nov 04, 2013 12:37 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Schematic on p. 122
Replies: 1
Views: 347

Schematic on p. 122

On the top right corner if page 122 is a schematic of a polyatomic orbital. How did they come up with the shapes drawn? Also, how do we know that the 1b1 orbital is nonbonding? Lastly, are we required to understand how to come up with these types of molecular orbital diagrams?
by cgarcia
Mon Nov 04, 2013 12:23 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Molecular Orbitals and Hybridization
Replies: 1
Views: 305

Molecular Orbitals and Hybridization

This is sort of a list of questions that pertain to one subject in general: I've noticed that molecular orbital theory relies less on the concept of hybridization than valence bond theory. A note on page 122 of the textbook mentioned that "molecular orbitals are built from all the available [i]...
by cgarcia
Mon Nov 04, 2013 12:13 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Drawing Heteronuclear Molecular Orbitals
Replies: 1
Views: 352

Drawing Heteronuclear Molecular Orbitals

I was watching the midterm review session podcast from last friday (11/1) and I noticed that when we were drawing a heteronuclear molecular orbital that the molecular orbitals were still symmetrical in the sense that if one drew a line down the middle, there would be symmetry. However, in the textbo...
by cgarcia
Mon Nov 04, 2013 12:05 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Need to know MOs for triatomic atoms?
Replies: 3
Views: 490

Re: Need to know MOs for triatomic atoms?

I noticed that this is one of the questions from past classes. We are still not required to know how to draw polyatomic molecular orbital diagrams, correct?
by cgarcia
Fri Nov 01, 2013 8:41 pm
Forum: Hybridization
Topic: Different Hybrid Orbital Bonds
Replies: 3
Views: 522

Re: Different Hybrid Orbital Bonds

The specific molecule I was working with was CH2CHCN and I was particularly interested in the sigma bond between the two carbons at the end (the carbon attached to 1 H and the carbon attached to N). I understand that the carbon attached to the hydrogen (let's call it C1) has three areas of electron ...
by cgarcia
Thu Oct 31, 2013 6:06 pm
Forum: Hybridization
Topic: Lone Pairs in Hybridized Orbitals
Replies: 1
Views: 354

Lone Pairs in Hybridized Orbitals

Are lone pairs in atoms with hybridized orbitals in bonds also in hybridized orbitals?
by cgarcia
Thu Oct 31, 2013 5:59 pm
Forum: Hybridization
Topic: Different Hybrid Orbital Bonds
Replies: 3
Views: 522

Different Hybrid Orbital Bonds

Is it possible for different types of hybrid orbitals to bond? For example, can a 2sp2 bond with an sp?
by cgarcia
Thu Oct 31, 2013 11:56 am
Forum: Determining Molecular Shape (VSEPR)
Topic: 3.3b bond angle
Replies: 1
Views: 458

3.3b bond angle

In 3.3, we have a ClO2+ ion. From the lewis structure, I was able to determine that there are four areas of electron density with two lone pairs giving it a VSEPR formula of AX2E2. I understand that the shape would be angular and it would be bent more than the shape of a molecule with VSEPR formula ...
by cgarcia
Thu Oct 17, 2013 10:28 pm
Forum: Significant Figures
Topic: Significant Figures in regards to energy states
Replies: 3
Views: 573

Re: Significant Figures in regards to energy states

What if they are the only information given? For example, the question asks what is the energy released when an electron jumps down from n=4 to n=1 and the integers were the only information given; how many sig figs should our answer have?
by cgarcia
Thu Oct 17, 2013 7:01 pm
Forum: Significant Figures
Topic: Significant Figures in regards to energy states
Replies: 3
Views: 573

Significant Figures in regards to energy states

If asked to calculate the energy of electrons in n-energy levels and just given values such as n=4 and n=1, how many sig figs should be in our answer? I've noticed in the workbook that the answer generally has 3 sig figs, but other than that I have no clue how many sig figs to leave in the answer.
by cgarcia
Thu Oct 17, 2013 6:51 pm
Forum: Quantum Numbers and The H-Atom
Topic: Radial Distribution
Replies: 1
Views: 357

Radial Distribution

From what I understand from the text, the radial distribution pertains to the likelihood of finding an electron within a certain radius. When it says “in the range of radii Sr”, does it talk of only locations that are that particular distance from the nucleus or of any location within the boundaries...
by cgarcia
Thu Oct 17, 2013 6:50 pm
Forum: Quantum Numbers and The H-Atom
Topic: 1s-orbital in He^+ vs. 1s-orbital in H
Replies: 1
Views: 416

1s-orbital in He^+ vs. 1s-orbital in H

Both He^+ and H would have 1 electron in the s-orbital, correct? Would the only difference between the two be that the s-orbital of He^+ would be closer to the nucleus since there is a higher effective nuclear charge than in H?
by cgarcia
Thu Oct 17, 2013 6:46 pm
Forum: Quantum Numbers and The H-Atom
Topic: Bohr Radius
Replies: 1
Views: 357

Bohr Radius

What is the Bohr radius exactly?

Go to advanced search