Search found 10 matches
- Sun Mar 19, 2017 8:35 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3589865
- Sun Mar 12, 2017 10:12 pm
- Forum: *Electrophiles
- Topic: Self-test 4.2A
- Replies: 1
- Views: 1273
Re: Self-test 4.2A
We know that two methyl groups are attached to the benzyl carbocation because it says dimethyl. We first draw the ring structure of Benzene with a positive charge on one of the carbon atoms. We will number this as (1). Te name of the compound indicates that there are methyl groups attached at the 3r...
- Sun Mar 05, 2017 1:51 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3589865
- Sun Feb 26, 2017 6:13 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3589865
- Sun Feb 19, 2017 8:08 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3589865
- Sun Feb 12, 2017 8:21 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Ch 14 Q #35
- Replies: 1
- Views: 488
Re: Ch 14 Q #35
There are two equations for Delta G -
Delta G = -nFE
Delta G = -RTLn(K)
If you equate the two equations you would end up at nFE = RTLn(K)
and Ln(K) = nFE/RT and then you basically plug in the values of R, F and T
Delta G = -nFE
Delta G = -RTLn(K)
If you equate the two equations you would end up at nFE = RTLn(K)
and Ln(K) = nFE/RT and then you basically plug in the values of R, F and T
- Sun Feb 05, 2017 3:53 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Page 50 Course Reader Explanation
- Replies: 2
- Views: 475
Re: Page 50 Course Reader Explanation
In this case the cathode reaction would be the reduction of Nitrate anion to Nitric oxide and the anode reaction would be the oxidation of Gold to its trivalent cation. When we try to find the potential(E) of a cell we subtract the reduction potential of the anode from the cathode or we add the redu...
- Sun Jan 29, 2017 12:56 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Equations
- Replies: 1
- Views: 403
Re: Equations
We can equate the two equations for Gibbs free energy to derive a formula that can help us calculate the Equilibrium constant of a chemical reaction at 2 different temperatures. The equation derived is called the Van't Hoff equation and explains the temperature dependance of K.
- Sun Jan 22, 2017 11:37 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpy vs. Entropy [ENDORSED]
- Replies: 2
- Views: 1229
Re: Enthalpy vs. Entropy [ENDORSED]
Enthalpy is a state function that keeps track of the energy of a system at constant pressure. A change in the value of the enthalpy of a system equals to the amount of heat released or absorbed at constant pressure. Entropy is a value that helps us determine the spontaneity of a chemical reaction.
- Sat Jan 14, 2017 8:23 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Example on page 20 of course reader
- Replies: 1
- Views: 464
Re: Example on page 20 of course reader
The negative sign in that equation is not for the specific heat of water. It indicative of whether heat is being lost or gained by the surroundings. Hope that helped.