Search found 11 matches
- Wed Mar 09, 2016 12:12 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3006343
Re: Chemistry Jokes
POLAR bear!
- Mon Feb 29, 2016 4:15 pm
- Forum: *Alkanes
- Topic: Introduction to Organic Chemistry P8
- Replies: 1
- Views: 311
Introduction to Organic Chemistry P8
The second example on page 8 gives the name 4-ethyl-2,2-dimethylhexane, but I was wondering why it is not 3-ethyl-5,5-dimethylhexane instead... Wouldn't the latter be preferred since 3<4?
- Thu Feb 25, 2016 10:02 am
- Forum: *Complex Reaction Coordinate Diagrams
- Topic: Delta G for TS2
- Replies: 1
- Views: 1330
Delta G for TS2
For a reaction involving two intermediates, why is the deltaG of TS2 its peak minus the free energy of the reactants instead of that of the first intermediate??
- Wed Feb 17, 2016 4:32 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Proposed structure for the activated complex? HW 15.85
- Replies: 1
- Views: 509
Re: Proposed structure for the activated complex? HW 15.85
I'd say that you can just follow how the solution manual does it: showing an intermediate state between the unreacted complexes and products. Orientation is the most important in proposing the structure. Thus, you wouldn't need to worry about reversing the activated complex since the orientation sho...
- Wed Feb 10, 2016 1:31 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: standard reaction enthalpy for formation. Q2 1st midterm
- Replies: 1
- Views: 462
Re: standard reaction enthalpy for formation. Q2 1st midterm
Adding up all the delta Hs gives you the enthalpy change for the reaction, which produces 2 moles of AlCl3. The question is asking for the enthalpy for the formation of anhydrous aluminum chloride, which is synonymous to finding the enthalpy of formation for AlCl3, which, should be obtained by divid...
- Wed Feb 03, 2016 12:01 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Gibbs free energy (standard) for Redox Rxn
- Replies: 2
- Views: 672
Re: Gibbs free energy (standard) for Redox Rxn
To add a point: remember to balance the redox reaction first! If the two half reactions have different moles of electrons as reactants and products, your n would be their least common multiple! Hope this helps :).
- Wed Jan 27, 2016 2:31 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: About a Zn-Cu Galvanic Cell
- Replies: 1
- Views: 373
About a Zn-Cu Galvanic Cell
Given the reduction half-reaction is essentially Cu(2+) --> Cu, can we use something (that will not participate in the reaction) in place of copper as the electrode in the cathode? I don't know if I've explained it well enough, but I mean like is it ok to place a carbon rod in the solution rather th...
- Tue Jan 19, 2016 3:49 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Adiabatic process
- Replies: 1
- Views: 407
Re: Adiabatic process
In an adiabatic process, q=0 since no heat is transferred. As a result, U=q=0 only if w=0.
- Fri Jan 15, 2016 3:12 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Entropy v. Degeneracy
- Replies: 2
- Views: 529
Re: Entropy v. Degeneracy
Entropy can be interpreted as the degree of disorder or randomness of a system while degeneracy is the possible number of microstates. In a sense, they are directly correlated: if a system has more possible microstates, it implies a higher degree of randomness. That is the conceptual understanding. ...
- Mon Jan 11, 2016 7:15 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: System and Surroundings
- Replies: 2
- Views: 1083
System and Surroundings
On page 7 of our course reader, there is a part saying that q(system) + q(surrounding) = 0. I have a question regarding the parenthesis preceding the equation: what does a "perfect system" mean exactly?
- Wed Jan 06, 2016 8:30 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpies for State Changes
- Replies: 3
- Views: 701
Re: Enthalpies for State Changes
In addition to the previous replies, I'd like to add that the ways through which we calculate enthalpy of vaporization and enthalpy of fusion are both simple manipulations of the basic formula deltaH=H(final)-H(initial) due to the fact that enthalpy is a state function.