Search found 21 matches
- Fri Mar 17, 2017 12:50 am
- Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- Topic: Dihedral Angles
- Replies: 1
- Views: 738
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 ...
- 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: 564
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.
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.
- Fri Mar 17, 2017 12:34 am
- Forum: *Cyclopropanes and Cyclobutanes
- Topic: Total Strain of Cyclopropane versus Cyclobutane
- Replies: 1
- Views: 1338
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.
- Fri Mar 17, 2017 12:32 am
- Forum: *Cyclopentanes
- Topic: Difference in Strains
- Replies: 1
- Views: 1311
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 ...
- 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: 449
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...
- Tue Mar 07, 2017 11:39 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3693899
Re: Post All Chemistry Jokes Here
My Father is a Chemist my Mother is a Mathematician. They named me iron59.
- Tue Mar 07, 2017 11:29 pm
- Forum: *Nucleophiles
- Topic: Lone Pairs
- Replies: 4
- Views: 1446
Re: Lone Pairs
Yes. It is the easiest way to identify a nucleophile.
- Tue Mar 07, 2017 6:58 pm
- Forum: *Ethers
- Topic: Double/triple bonds and Functional Groups
- Replies: 3
- Views: 1924
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
ex) 2-chlorobutane is correct
2-butalchlorine or anything else is incorrect
ex) phenylalanine
ex) 2-methylbutane
- Tue Mar 07, 2017 6:50 pm
- Forum: *Electrophiles
- Topic: Determining if a molecule is a nucleophile
- Replies: 4
- Views: 1590
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 ...
- Tue Mar 07, 2017 6:46 pm
- Forum: *Cycloalkanes
- Topic: Multiple possible names
- Replies: 2
- Views: 604
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
ex) 4-bromo-1-methoxy-2-nitrobenzene is correct
1-bromo-4-methoxy-3-nitrobenze is incorrect
- Sun Dec 04, 2016 12:33 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Paramagnetism
- Replies: 1
- Views: 617
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.
- Tue Nov 29, 2016 3:08 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: HW 11.67 Reasoning
- Replies: 2
- Views: 648
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...
- Tue Nov 29, 2016 2:41 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Hybridization
- Replies: 1
- Views: 484
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...
- Tue Nov 29, 2016 12:27 am
- Forum: Administrative Questions and Class Announcements
- Topic: Student Video Archive
- Replies: 1
- Views: 463
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.
- Mon Nov 28, 2016 10:42 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kp and Kc Same?
- Replies: 4
- Views: 1174
Kp and Kc Same?
Just wondering... would Kp and Kc be the same for a reaction?
- Mon Nov 14, 2016 10:41 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Homework 4.77 [ENDORSED]
- Replies: 1
- Views: 428
Re: Homework 4.77 [ENDORSED]
No. you just do the molecular orbital energy diagrams I think.
- 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: 511
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.
- Thu Oct 20, 2016 11:02 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Bruincast
- Replies: 26
- Views: 10646
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 ...
- Thu Oct 20, 2016 11:00 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron configuration for ions [ENDORSED]
- Replies: 2
- Views: 538
Re: Electron configuration for ions [ENDORSED]
Both are technically correct but just go with [Ar] to save you and anybody else some time.
- Mon Oct 10, 2016 11:16 am
- Forum: Administrative Questions and Class Announcements
- Topic: Material Covered on Quiz 1
- Replies: 4
- Views: 963
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
- Sun Oct 02, 2016 9:32 pm
- Forum: Properties of Light
- Topic: Electrons [ENDORSED]
- Replies: 2
- Views: 648
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=...