## Search found 11 matches

Fri Mar 11, 2016 9:46 pm
Forum: *Alkanes
Topic: cis vs trans
Replies: 2
Views: 347

### Re: cis vs trans

Fri Mar 11, 2016 4:03 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: 2013 #8B
Replies: 2
Views: 336

### 2013 #8B

The problem is:

Draw the most stable conformation for cis-1-chloro-3-ethylcyclohexane

Can someone please explain the reasoning behind having a chair structure and why the substituents are in the equatorial position?
Fri Mar 11, 2016 3:56 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: 2013 #4A - where does 4n come from?
Replies: 1
Views: 295

### 2013 #4A - where does 4n come from?

Here is the problem: 4a. When dissolved oxygen in water comes in contact with metal iron, rust is formed by the following reaction: 2Fe(s) + 2H2O(l) + O2(aq) --> 2Fe(OH)2(s) Enaut=+0.840V Two different concentrations of oxygen were dissolved in separate water droplets on an iron surface at 298K. The...
Mon Feb 29, 2016 3:32 pm
Topic: Rate limiting step
Replies: 1
Views: 241

### Re: Rate limiting step

The first step will always be the rate limiting step for electrophilic addition. The first step requires breaking an existing bond which requires a lot of energy and occurs very slowly.
Fri Feb 26, 2016 8:45 pm
Forum: *Nucleophiles
Topic: Br2 as an electrophile
Replies: 2
Views: 1055

### Re: Br2 as an electrophile

I believe it becomes electrophilic when a species of high electron density approaches it. The species causes the electrons of the Br2 molecule to be pushed toward one end, making one bromine negative and one bromine positive, thus creating a polar molecule.
Sat Feb 20, 2016 9:49 pm
Forum: *Alkanes
Topic: nucleophile v electrophile
Replies: 3
Views: 462

### Re: nucleophile v electrophile

An electrophile is a reactant that accepts an electron pair to form a new covalent bond. This is the same definition as a Lewis acid. Additionally, an electrophile is electron poor (electrophile means electron loving so you can think of it that way). A nucleophile is a reactant that provides a pair ...
Tue Feb 09, 2016 9:15 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Where did 0.05916 come from?
Replies: 2
Views: 879

### Re: Where did 0.05916 come from?

0.05916 is for the same equation but instead of ln you use log. The ln equation uses 0.0257. Also T is assumed or given to 298K as this is standard. So if you have a change in T in a problem you cannot use these constants.
Wed Feb 03, 2016 10:45 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams- Overview
Replies: 1
Views: 277

### Cell Diagrams- Overview

The concept of cell diagrams is still confusing me a lot.
Can someone give a basic overview of the parts that make up a the galvanic cells and how they relate to redox?
Sun Jan 24, 2016 2:11 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Kirchhoff's Law, Lattice enthalpy, and Born-Haber Cycle
Replies: 2
Views: 482

### Re: Kirchhoff's Law, Lattice enthalpy, and Born-Haber Cycle

I know that we don't have to know these 3 concepts because the textbook practice problems we were "assigned" skip over them. Additionally it says Omit 8.18 (Born-Haber Cycle) and 8.20 (Variation of Reaction Enthalpy with Temperature, which is when you would use Kirchhoff's law) Here is a v...
Sun Jan 17, 2016 4:42 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Reversible and irreversible
Replies: 2
Views: 362

### Re: Reversible and irreversible

According to our textbook "... in thermodynamics, a reversible process is one that can be reversed by an infinitely small change in a variable (an “infinitesimal” change). For example, if the external pressure exactly matches the pressure of the gas in the system, then the piston moves in neith...
Sat Jan 09, 2016 9:23 pm
Forum: Phase Changes & Related Calculations
Topic: Steam vs. Water burn
Replies: 2
Views: 375

### Re: Steam vs. Water burn

In class we labeled the enthalpy of each phase change of water's heating curve. These values represent how much energy is required to go from phase to phase. When steam is released onto one's skin, a lot of energy will be released for it to condense from vapor to liquid (the specific heat of vaporiz...