Search found 15 matches

by Brenton Hwee 2J
Wed Mar 15, 2017 10:39 am
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Gauche and Anti conformation
Replies: 1
Views: 443

Gauche and Anti conformation

Do the Gauche and anti conformation only apply to butane, or does it also have a significance in the other cycloalkane conformations? Also, as seen on the example on page 108, does the conformation always go Gauche to anti conformation because it goes from lower to lowest energy?
by Brenton Hwee 2J
Wed Mar 08, 2017 1:07 am
Forum: *Alkanes
Topic: Common name & IUPAC naming
Replies: 3
Views: 546

Re: Common name & IUPAC naming

I think usually you might see a common name prefix like "iso" when you are using IUPAC naming for a group that is on a substituent. An example would be like on page 96 on the course reader "isopropyl-cyclohexane" which utilizes the "iso" common name as a prefix to the p...
by Brenton Hwee 2J
Thu Mar 02, 2017 10:41 pm
Forum: *Alkanes
Topic: Hydrocarbons memorizations
Replies: 2
Views: 406

Hydrocarbons memorizations

For the quiz and final and in general, do we have to memorize past the first 10 hydrocarbons for naming? In the course reader, it only names the first 10, while the organic textbook lists up to 20. Will we ever work with anything past 10 in this class when naming compounds because all the examples h...
by Brenton Hwee 2J
Wed Feb 22, 2017 11:27 pm
Forum: *Electrophiles
Topic: Nucleophiles and Electrophiles
Replies: 2
Views: 436

Nucleophiles and Electrophiles

What is the difference between nucleophiles and electrophiles from what we learned previously about electron transfer/sharing in ionic and covalent bonds? It seems like both deal with e- rich regions and negative and positives attracted to each other.
by Brenton Hwee 2J
Wed Feb 15, 2017 3:06 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagram
Replies: 11
Views: 1086

Re: Cell Diagram

No, the order does not matter when they are separated by a comma. However, for the solids they are usually placed at the end of the cell diagram, and gases usually go right before the electrode, separated by a line.
by Brenton Hwee 2J
Thu Feb 09, 2017 3:28 pm
Forum: First Order Reactions
Topic: Order of reactions
Replies: 1
Views: 385

Order of reactions

If the order of the reactants are both first order, but the overall order reaction is 2, what does this tell us? Do we just use the individual reactants or do we we use the overall because the rate constant is dependent on both of the reactants?
by Brenton Hwee 2J
Thu Feb 02, 2017 6:11 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Irreversible vs reversible pathway
Replies: 2
Views: 559

Irreversible vs reversible pathway

If we know that all real processes are irreversible, then how do we know when to use w = -nRT ln V1/V2 instead of w = -P∆V and vice versa? For calculating entropy, do we never use w = -P∆V because it has to be a reversible expansion and isothermal?
by Brenton Hwee 2J
Mon Jan 23, 2017 12:26 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Boltzmann Equation
Replies: 1
Views: 308

Re: Boltzmann Equation

I believe we do have to use this equation to solve for problems when finding positional/residual entropy, as seen in the example on the bottom of page 29 in the course reader. In the example, we know the degeneracy and use the Boltzmann equation to solve for entropy and determine that the system has...
by Brenton Hwee 2J
Wed Jan 11, 2017 9:52 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Reaction Enthalpy of O2
Replies: 2
Views: 449

Standard Reaction Enthalpy of O2

I remember in class Dr. Lavelle said that the standard reaction enthalpy of O2 is 0. Why is that?
by Brenton Hwee 2J
Sat Dec 03, 2016 11:08 pm
Forum: *Shrodinger Equation
Topic: Hamiltonian for Schrodinger [ENDORSED]
Replies: 1
Views: 428

Hamiltonian for Schrodinger [ENDORSED]

For the Schrodinger equation, why does a double derivative give the wave function back on the right hand side? (Question 2D 2015 Final Exam)
by Brenton Hwee 2J
Sun Nov 20, 2016 5:54 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: MO adding/deleting e-
Replies: 3
Views: 580

Re: MO adding/deleting e-

You add electrons to the more electronegative element and remove electrons from the less electronegative element.
by Brenton Hwee 2J
Thu Oct 27, 2016 2:11 pm
Forum: Octet Exceptions
Topic: Half Full d^5 and Full d^10 Subshells
Replies: 4
Views: 822

Re: Half Full d^5 and Full d^10 Subshells

Is there an exception for Cobalt ions too?
by Brenton Hwee 2J
Fri Oct 14, 2016 1:47 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity
Replies: 3
Views: 754

Re: Electron Affinity

If electron affinity is highest in the top right corner of the periodic table, why does Chlorine have a higher electron affinity than Fluorine?
by Brenton Hwee 2J
Mon Oct 10, 2016 1:33 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty
Replies: 11
Views: 2217

Re: Uncertainty

Can we use the Heisenberg Uncertainty Principle for all atoms or does it only apply to certain elements?
by Brenton Hwee 2J
Wed Sep 28, 2016 3:31 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect [ENDORSED]
Replies: 12
Views: 1818

Re: Photoelectric Effect [ENDORSED]

I know that intensity and the number of photons are related, but is there any equation or way to numerically calculate those values? Or are the numerical values not relevant to what we're learning?

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