Search found 21 matches

by Karan Ishii 3E
Fri Mar 17, 2017 12:50 am
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Dihedral Angles
Replies: 1
Views: 336

Re: Dihedral Angles

Dihedral atoms of eclipsed conformations are 0 because they line up so there's no angle if you look at them from a Newman projection. You're comparing the angles between the 3 hydrogens of each carbon to the other hydrogens. If the hydrogen atoms arranged around the carbon were staggered then there ...
by Karan Ishii 3E
Fri Mar 17, 2017 12:39 am
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Practice Final 2015 9b Alcohol vs Hydroxyl
Replies: 1
Views: 246

Re: Practice Final 2015 9b Alcohol vs Hydroxyl

Hydroxyl components are not part of organic molecules. OH acts differently depending on what it is attached to.
For example, compare KOH with H3COH.
They both have OH but in KOH OH is a bonded ionically to an alkali metal.

CH3COOH acts as a base but is an organic molecule so uses the alcohol name.
by Karan Ishii 3E
Fri Mar 17, 2017 12:34 am
Forum: *Cyclopropanes and Cyclobutanes
Topic: Total Strain of Cyclopropane versus Cyclobutane
Replies: 1
Views: 498

Re: Total Strain of Cyclopropane versus Cyclobutane

Because even the bonds between the carbon atoms are still bent (banana bonds). The arrangement is slightly staggered but there's still high energy.
by Karan Ishii 3E
Fri Mar 17, 2017 12:32 am
Forum: *Cyclopentanes
Topic: Difference in Strains
Replies: 1
Views: 483

Re: Difference in Strains

Steric– strain between non bonded atoms that occupy the same space ex) flag pole hydrogens in the boat conformation Torsional strain– strain due to rotation where there is a lot of repulsion. a force opposes rotation of a part of a molecule about a bond ex) CH3-CH3 eclipsed bond strain- when a bond ...
by Karan Ishii 3E
Fri Mar 17, 2017 12:26 am
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: self test 3.3A
Replies: 1
Views: 234

Re: self test 3.3A

I would guess that it's because at high temperatures theres more kinetic energy where the molecules collide more, rotating the butane carbons to be in their conformations that are less stable. Gauche isn't as unstable as the other two eclipsed conformations which would revert more easily to a gauche...
by Karan Ishii 3E
Tue Mar 07, 2017 11:39 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7581
Views: 1012742

Re: Post All Chemistry Jokes Here

My Father is a Chemist my Mother is a Mathematician. They named me iron59.
by Karan Ishii 3E
Tue Mar 07, 2017 11:29 pm
Forum: *Nucleophiles
Topic: Lone Pairs
Replies: 2
Views: 529

Re: Lone Pairs

Yes. It is the easiest way to identify a nucleophile.
by Karan Ishii 3E
Tue Mar 07, 2017 6:58 pm
Forum: *Ethers
Topic: Double/triple bonds and Functional Groups
Replies: 3
Views: 885

Re: Double/triple bonds and Functional Groups

Functional groups come before

ex) 2-chlorobutane is correct
2-butalchlorine or anything else is incorrect

ex) phenylalanine

ex) 2-methylbutane
by Karan Ishii 3E
Tue Mar 07, 2017 6:50 pm
Forum: *Electrophiles
Topic: Determining if a molecule is a nucleophile
Replies: 2
Views: 567

Re: Determining if a molecule is a nucleophile

No, at least in this course even if there might be some wack rare compound that does that. Remember that negative charge or partial negative charge repels other negatively charged things. There would be little attraction between positive charges that would result in a reaction unless perhaps theres ...
by Karan Ishii 3E
Tue Mar 07, 2017 6:46 pm
Forum: *Cycloalkanes
Topic: Multiple possible names
Replies: 2
Views: 265

Re: Multiple possible names

The one with the smallest overall number.

ex) 4-bromo-1-methoxy-2-nitrobenzene is correct
1-bromo-4-methoxy-3-nitrobenze is incorrect
by Karan Ishii 3E
Sun Dec 04, 2016 12:33 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Paramagnetism
Replies: 1
Views: 282

Re: Paramagnetism

It helps to write out the electron configuration because you can clearly see when there are unpaired elctrons that would make the molecule paramagnetic meaning it's attracted to magnets. A bond order that has a .5 is also an indicator of paramagnetism.
by Karan Ishii 3E
Tue Nov 29, 2016 3:08 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: HW 11.67 Reasoning
Replies: 2
Views: 414

Re: HW 11.67 Reasoning

The reaction system favors the reverse reaction because the K value is very very low. I don't think this is due to the pressure of the system because initially there is the same pressure on both sides of the reaction so I don't think this would result in a favoring of a side (correct me if I'm wrong...
by Karan Ishii 3E
Tue Nov 29, 2016 2:41 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Hybridization
Replies: 1
Views: 244

Re: Hybridization

Hybridization is part of the valence bond theory so is unrelated to the molecular orbital theory or even the VESPR theory. The Molecular Orbital Theory serves to show that atomic orbitals of bonding atoms combine to form molecular orbitals that aren't localized to one atom but the electrons are spre...
by Karan Ishii 3E
Tue Nov 29, 2016 12:27 am
Forum: Administrative Questions and Class Announcements
Topic: Student Video Archive
Replies: 1
Views: 277

Student Video Archive

Hi I was wondering if there is a place on the website that contains all of the videos that past and present students have made on topics or how to solve specific questions. I find them really useful because its as if I am solving the problems with them.
by Karan Ishii 3E
Mon Nov 28, 2016 10:42 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp and Kc Same?
Replies: 4
Views: 545

Kp and Kc Same?

Just wondering... would Kp and Kc be the same for a reaction?
by Karan Ishii 3E
Mon Nov 14, 2016 10:41 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Homework 4.77 [ENDORSED]
Replies: 1
Views: 228

Re: Homework 4.77 [ENDORSED]

No. you just do the molecular orbital energy diagrams I think.
by Karan Ishii 3E
Mon Nov 14, 2016 10:39 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Valence-shell configuration and periodic trends
Replies: 2
Views: 249

Re: Valence-shell configuration and periodic trends

Molecular orbitals can help explain periodic trends in electronegativity, ionization energy, and electron affinity in the same way as atomic orbitals and electron configuration. Incomplete molecular orbital = easier to pull off an electron while molecular orbital with two electrons is harder.
by Karan Ishii 3E
Thu Oct 20, 2016 11:02 pm
Forum: Administrative Questions and Class Announcements
Topic: Bruincast
Replies: 26
Views: 8086

Re: Bruincast

Yeah some professors choose to have only audio recorded. It just depends on the prof. Some feel more comfortable without visuals but with Lavelle's lectures, all of what he puts up on the board is for the most part covered in the course reader. I mean honestly the best thing is to go to lecture but ...
by Karan Ishii 3E
Thu Oct 20, 2016 11:00 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron configuration for ions [ENDORSED]
Replies: 2
Views: 259

Re: Electron configuration for ions [ENDORSED]

Both are technically correct but just go with [Ar] to save you and anybody else some time.
by Karan Ishii 3E
Mon Oct 10, 2016 11:16 am
Forum: Administrative Questions and Class Announcements
Topic: Material Covered on Quiz 1
Replies: 4
Views: 638

Re: Material Covered on Quiz 1

Lecture 1 went up to page 22 in the course reader on Wednesday so that's where in studying up to
by Karan Ishii 3E
Sun Oct 02, 2016 9:32 pm
Forum: Properties of Light
Topic: Electrons [ENDORSED]
Replies: 2
Views: 353

Re: Electrons [ENDORSED]

I'm not really sure what you mean about 'energy status' but I'm guessing you mean what happens to the electron as n increases? So n increases only because the energy of the electron increases. It becomes "excited" and moves to a higher energy shell. This could be from n=1 to n=2, n=1 to n=...

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