## Search found 14 matches

Wed Mar 09, 2016 10:13 am
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Replies: 1
Views: 349

In the course reader on page 105, Dr. Lavelle said that the 3,6-Dimethyl-3-Octene is E. Essentially, you can see that since the substituents are on opposite sides right? Figuring this out by comparing higher priority groups however is confusing me. He said you compare the Hydrogen and Carbon and the...
Fri Feb 26, 2016 2:57 am
Forum: *Cycloalkanes
Topic: Alphabetical Naming
Replies: 1
Views: 376

### Alphabetical Naming

For the prefixes, "iso-", "neo-", "tert-", and "sec-", which do you not include when arranging substituent names in alphabetical order?
Sun Feb 14, 2016 3:29 am
Forum: General Rate Laws
Topic: Course Reader 2nd Order Rxn
Replies: 2
Views: 442

### Course Reader 2nd Order Rxn

In the course reader on page 67, when integrating, how does -(d[A])/([A]^2)=kdt turn into positive (1/[A])=kt+b? I understand the integration but not why the negative disappears.
Tue Feb 09, 2016 4:36 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Determining n in G=-nFE
Replies: 4
Views: 12104

### Re: Determining n in G=-nFE

I'm still having trouble finding n. I understood it to as being the number of moles in a chemical equation, but that seems to not be right.. What do you mean by "the number of electrons being transferred"? Could you please elaborate? For example, problem 14.9a, for the equation 2Ce^(4+)+3I...
Mon Feb 08, 2016 1:58 am
Forum: Balancing Redox Reactions
Topic: Writing Skeletal Equations
Replies: 4
Views: 877

### Writing Skeletal Equations

For Chap 14 #1a, the chemical equation is
O3+Br^- -> O2+BrO3^-
and for the skeletal equations, it is said to be O3 -> O2. Why isn't it O3 -> BrO3^- since both sides contain ozone?
Sun Jan 31, 2016 9:39 pm
Forum: Calculating Work of Expansion
Topic: Ideal Gases Formula
Replies: 1
Views: 364

### Ideal Gases Formula

Why is it that for the equation deltaS=nRln(P1/P2), the change in pressure goes from initial to final instead of final over initial, like for ideal gases' change in temperature?
Sun Jan 24, 2016 11:39 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Gibbs Free Energy
Replies: 1
Views: 208

### Gibbs Free Energy

I'm having a little trouble conceptually understanding Gibb's Free Energy. I understand that it is a state function, calculated after work is done, and it is "free" available energy. Does this mean that this "energy" is essentially from the heat that's been released from exotherm...
Sun Jan 17, 2016 10:13 pm
Forum: Phase Changes & Related Calculations
Topic: Changing the energy of a system
Replies: 2
Views: 322

### Changing the energy of a system

According to the course reader page 8, the ways of changing the energy of a system include:
Adding or removing the amount of substance in a system, heating/cooling, or putting work on the system. What are the equations to calculate the change of energy for each of these?
Sun Jan 10, 2016 8:32 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: State Properties
Replies: 2
Views: 423

### State Properties

In the course reader on page 1, it states that the state properties are "U, P, V, T..." what do these stand for?
Sat Nov 28, 2015 1:30 am
Forum: Limiting Reactant Calculations
Topic: Video: Limiting Reactants and More
Replies: 2
Views: 414

### Video: Limiting Reactants and More

2 Limiting reagent problems as well as sub-problems
Mon Oct 26, 2015 1:12 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 1
Views: 666

### Bond Angles

Bonding angles for linear, trigonal planar, tetrahedral, and octahedral typically have 180, 120, 109.5, and 90 degree angles, respectively. Are there any exceptions to this? For example, will lone pairs have an effect on the angle measures as opposed to paired electrons?
Fri Oct 16, 2015 4:43 pm
Forum: Hybridization
Topic: Electron Configuration
Replies: 2
Views: 505

### Electron Configuration

Why are electron shells not consistent by following an S, D, P, F pattern? Ive seen electrons that have been written with "s" and "p", then others as "s", "d", then "p". Is there a pattern one can follow to write electron configurations?
Fri Oct 09, 2015 1:39 pm
Forum: Ionic & Covalent Bonds
Topic: Valence Electrons
Replies: 3
Views: 531

### Valence Electrons

How do you find the number of valence electrons an element has? I understand that generally, you can correlate the number of valence electrons with the group number it is in, however I believe that this rule does not apply to transition metals. How are you able to determine transition metals' valenc...
Fri Oct 02, 2015 1:21 pm
Forum: Properties of Electrons
Topic: Classical and Quantum mechanics
Replies: 2
Views: 469

### Classical and Quantum mechanics

What justifies something being classical or quantum? According to the course reader, classical mechanics "explains the behavior of large objects" while quantum mechanics "describes the behavior of very small objects that can accept energy only in discrete amounts". What exactly m...