Search found 10 matches

by Nayeon Kang 2M
Sun Mar 19, 2017 2:58 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Chair conformations [ENDORSED]
Replies: 2
Views: 683

Chair conformations [ENDORSED]

For two chair conformations of Trans-1,4-dimethylcyclohexane (pg 112), why's one chair conformation more stable than the other one? Aren't they same?
by Nayeon Kang 2M
Sun Mar 12, 2017 11:51 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Butane - Gauche formation
Replies: 1
Views: 259

Butane - Gauche formation

For the Butane conformation, why's θ=120 degree has a higher energy than θ=60 degree? θ=120 degree is further than θ=60 degree, so shouldn't this be weaker in energy?
by Nayeon Kang 2M
Sun Mar 05, 2017 11:10 pm
Forum: *Alkanes
Topic: Naming
Replies: 1
Views: 283

Naming

For the organic molecules at pg 92, why can't we say it's 5-Ethyl-3-Methyl-Heptane?
by Nayeon Kang 2M
Sun Feb 26, 2017 6:48 pm
Forum: *Electrophiles
Topic: Nucleophile and Electrophile
Replies: 3
Views: 319

Nucleophile and Electrophile

In the book, it says F (Florine) is an electrophile since it wants more electron. Then does that mean Li (Lithium) and Na (sodium) are nucleophiles??
by Nayeon Kang 2M
Wed Feb 15, 2017 2:26 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 2015 Midterm Q4&5 part 3
Replies: 1
Views: 207

2015 Midterm Q4&5 part 3

What's the answer if the problem asks to find S(surrounding) and S(universe) for the transformation when it's irreversible?
by Nayeon Kang 2M
Thu Feb 09, 2017 11:14 pm
Forum: General Rate Laws
Topic: Instantaneous rate
Replies: 1
Views: 225

Instantaneous rate

When calculating the instantaneous rate, do we always have to compare initial slope of tangent of all reaction? If yes, why??
by Nayeon Kang 2M
Sun Feb 05, 2017 7:51 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell diagram
Replies: 1
Views: 170

Cell diagram

On the cell diagram of the equation on pg.48 of the course reader, why's there a comma between Fe3+ and Fe2+ instead of | sign? We use | between Cu and Cu2+ but why not between Fe3+ and Fe2+?

Thanks
by Nayeon Kang 2M
Sun Jan 29, 2017 10:34 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 1 Preparation Answers
Replies: 130
Views: 13484

Re: Quiz 1 Preparation Answers

How can you solve #11? Is it right to use H=ncT here??
by Nayeon Kang 2M
Fri Jan 20, 2017 10:03 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: U=q+w [ENDORSED]
Replies: 1
Views: 216

U=q+w [ENDORSED]

In U=q+w equation, does q always has to be under constant pressure? Are there any exceptions?
by Nayeon Kang 2M
Fri Jan 20, 2017 9:55 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond enthalpy problem solve
Replies: 1
Views: 194

Bond enthalpy problem solve

When we do the bond enthalpy problems, can we always just count all the bonds of the molecules to calculate the bond enthalpy?

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