Search found 10 matches

by Michelle_Ahn_2N
Wed Mar 15, 2017 1:29 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: nonplanar vs planar conformations
Replies: 1
Views: 452

nonplanar vs planar conformations

As I was reviewing the conformations part for cycloalkanes, I was wondering
What determines the planarity in conformations? Is it just the number of carbons?
and also which one is more stable between nonplanar conformations and planar conformations?

Thanks in advance for your reply!
by Michelle_Ahn_2N
Sun Mar 05, 2017 4:52 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: standard free energy of activation and Ea
Replies: 1
Views: 742

standard free energy of activation and Ea

when getting standard free energy of activation, is it okay to use the formula of Ea= standard enthalpy of activation +RT since -Tdelta Standard Entropy of activation is negligible? So my question is does it matter which formula out of delta G formula and Ea formula, we use to get delta G? Thanks in...
by Michelle_Ahn_2N
Sat Feb 25, 2017 9:17 pm
Forum: *Electrophiles
Topic: Questions about Electrophile and Nucleophile [ENDORSED]
Replies: 2
Views: 304

Questions about Electrophile and Nucleophile [ENDORSED]

I have two questions regarding Electrophile and Nucleophile !
What is the role that polarity plays in Electrophiles and Nucleophiles?
How much polar does the compound has to be in order to be electrophile or nucleophile?


Thanks in advance for your reply!
by Michelle_Ahn_2N
Sun Feb 19, 2017 8:54 pm
Forum: General Rate Laws
Topic: General rate laws question
Replies: 2
Views: 259

General rate laws question

when we put negative sign in front of the rate law formula for reactants, why does that
negative sign go away later on as we solve for the variables? Is that just because we can't have negative rate?

Thanks in advance for your help!
by Michelle_Ahn_2N
Sun Feb 12, 2017 10:19 pm
Forum: Balancing Redox Reactions
Topic: Balancing Redox reactions
Replies: 1
Views: 220

Balancing Redox reactions

When matching the numbers of oxygen and hydrogen, on which side do we put each of these,
H2O, OH, H ?
Is it correct that we put OH- on reactant side and H2O for product side for basic reactions
while we put H2O for reactant side and H+ on product side for acidic reactions?


Thanks in advance!
by Michelle_Ahn_2N
Sun Feb 05, 2017 7:06 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Homework problem #13 (Chapter 14)
Replies: 1
Views: 224

Homework problem #13 (Chapter 14)

For question 13-b) Ce^4+ (aq) + I^- (aq) -> I2(s) + Ce^3+(aq), I know how to write the half -reactions and the balanced equations for above reactions, but I don't know how to write the cell diagram for this. What is the process in writing the cell diagram for that reaction and in general? Thanks in ...
by Michelle_Ahn_2N
Fri Feb 03, 2017 7:09 pm
Forum: Balancing Redox Reactions
Topic: Standard reduction potential (E)
Replies: 2
Views: 372

Standard reduction potential (E)

I have a question on standard reduction potential (E) value.
For half reactions, is E value always positive for cathode and negative for anode? or does it vary
depending on the situations?

Thanks in advance for your help!
by Michelle_Ahn_2N
Sun Jan 29, 2017 3:23 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1019187

Re: Post All Chemistry Jokes Here

Mum, you can't fight the 2nd law of thermodynamics
All things, which includes bedrooms, move from a state of order to disorder.


http://image.wikifoundry.com/image/3/f1 ... /GW644H493
by Michelle_Ahn_2N
Sat Jan 21, 2017 11:19 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Question about the ideal gas law [ENDORSED]
Replies: 1
Views: 290

Question about the ideal gas law [ENDORSED]

When Professor was going over the course reader page 19, he mentioned about the ideal gas law- PV=NRT , I was wondering if the ideal gas law is only applicable when the question mentions the standard condition, like 1 atm and 25 celsius. If the question does not say about the standard condition, can...
by Michelle_Ahn_2N
Sat Jan 14, 2017 7:00 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpies
Replies: 1
Views: 209

Standard Enthalpies

Hello, I was going over the part for standard reaction enthalpies. I get elements are in its most stable form for the standard enthalpy of formation. But at the same time, I was confused on what makes and why 0 is the most stable form of standard enthalpy of formation for an element. I'd really appr...

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