Search found 11 matches

by Maggie Chen 2A
Wed Mar 09, 2016 12:12 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 900616

Re: Chemistry Jokes

POLAR bear!
by Maggie Chen 2A
Mon Feb 29, 2016 4:15 pm
Forum: *Alkanes
Topic: Introduction to Organic Chemistry P8
Replies: 1
Views: 144

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?
by Maggie Chen 2A
Thu Feb 25, 2016 10:02 am
Forum: *Complex Reaction Coordinate Diagrams
Topic: Delta G for TS2
Replies: 1
Views: 497

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??
by Maggie Chen 2A
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: 327

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...
by Maggie Chen 2A
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: 214

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...
by Maggie Chen 2A
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: 364

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 :).
by Maggie Chen 2A
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: 204

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...
by Maggie Chen 2A
Tue Jan 19, 2016 3:49 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Adiabatic process
Replies: 1
Views: 189

Re: Adiabatic process

In an adiabatic process, q=0 since no heat is transferred. As a result, U=q=0 only if w=0.
by Maggie Chen 2A
Fri Jan 15, 2016 3:12 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy v. Degeneracy
Replies: 2
Views: 346

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. ...
by Maggie Chen 2A
Mon Jan 11, 2016 7:15 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: System and Surroundings
Replies: 2
Views: 619

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?
by Maggie Chen 2A
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: 444

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.

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