- o chem meme.pdf
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- Sun Mar 19, 2017 11:26 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3594229
- Sun Mar 19, 2017 11:11 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 548187
Re: Saying Thank You to Dr. Lavelle
Thank you Dr. Lavelle for the copious amount of resources you give this class. This class had more helpful resources than any other I have taken at UCLA so far with the TA/UA office hours, chemistry community, and course reader. The intro to organic chemistry course reader should be extremely helpfu...
- Sun Mar 19, 2017 12:45 pm
- Forum: *Alkenes
- Topic: Are Alkenes considered functional groups?
- Replies: 1
- Views: 1433
Re: Are Alkenes considered functional groups?
I don't think we have to consider alkenes and alkynes functional groups. Lavelle only mentioned we should be able to identify and name Halides, alcohols, ethers, ketones, carboxylic acids, aldehydes, and amines.
- Sun Mar 19, 2017 12:32 pm
- Forum: Balancing Redox Reactions
- Topic: Electrolysis
- Replies: 1
- Views: 479
Re: Electrolysis
In electrolysis, the voltage come from an outside source, and not from the reactants spontaneously. Thus, the Eo is non spontaneous and negative in electrolysis reactions. When you add the Eo of reactants, you want your total Eo of the reaction to be as negative as possible instead of as positive as...
- Sun Mar 19, 2017 12:26 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: units of the rate of reaction
- Replies: 7
- Views: 1035
Re: units of the rate of reaction
Yes the reaction rate is usually determined by concentration (M) divided by time which could be seconds or minutes, hours, etc. k only has different units because you may be multiplying and dividing multiple units of (M/s) together
- Fri Feb 24, 2017 1:05 pm
- Forum: Administrative Questions and Class Announcements
- Topic: 14CL
- Replies: 6
- Views: 1838
Re: 14CL
14C and 14CL can be taken at the same time, but it is really up to your personal preference whether you want to take both at the same time or take 14CL in the future.
- Tue Jan 24, 2017 3:03 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Collisions of Particles
- Replies: 1
- Views: 519
Re: Collisions of Particles
Yes, particles with high thermal energy transfer thermal energy in the same way as high energy particles. They transfer thermal energy by crashing into particles of lower thermal energy, and the energy moves from higher to lower concentration. An example would be the high thermal energy of coffee th...
- Mon Nov 14, 2016 1:00 am
- Forum: Administrative Questions and Class Announcements
- Topic: Chem 14B enrollment
- Replies: 2
- Views: 985
Chem 14B enrollment
I was able to place out of Math 3A and was planning on taking Math 3B winter quarter 2017. However, now I want to take LS30A instead of Math 3B, but will I still be able to enroll in chem 14B next quarter then chem 14C while taking LS30B spring 2017?
- Fri Oct 28, 2016 2:04 am
- Forum: Lewis Structures
- Topic: "best" lewis structure
- Replies: 3
- Views: 872
Re: "best" lewis structure
Additionally you would rather have the central atom have a FC of 0. If FC=0 cannot be achieved for all the atoms, it is better to put the negative FC on the most electronegative atom.
- Fri Oct 21, 2016 10:23 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Angles of molecular shapes
- Replies: 5
- Views: 1391
Re: Angles of molecular shapes
Yes, the presence of electrons in bonds and especially lone pairs of e- is what determines the shape (tetrahedral, trigonal planar, trigonal bipyramidal)
- Fri Oct 14, 2016 12:00 am
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity in Group 15
- Replies: 1
- Views: 8204
Re: Electron Affinity in Group 15
The electron affinity for elements in Group 15 is much lower than elements in Group 14, 16, or 17 because elements in Group 15 have a half filled p subshell which is more stable than having an electron in Px, Py but not Pz orbital, or having not a full 6 electron p subshell. So they break the period...
- Thu Oct 06, 2016 10:16 pm
- Forum: DeBroglie Equation
- Topic: How do photons have momentum? [ENDORSED]
- Replies: 4
- Views: 1293
Re: How do photons have momentum? [ENDORSED]
Einstein's equation E= mc^2 is really just a shortened version of the real equation: E²=(mc²)²+(pc)². E=mc^2 is used for bodies with mass but are not moving while the other equation is used for bodies that are moving such as a photon. So when a photon is massless we can simplify the equation to E=pc...
- Thu Sep 29, 2016 8:58 pm
- Forum: Properties of Electrons
- Topic: Kinetic Energy of Electrons [ENDORSED]
- Replies: 5
- Views: 24404
Kinetic Energy of Electrons [ENDORSED]
When we are using the equation: E(photon)(hv) - threshold energy = excess kinetic energy of electron (1/2mv 2 ) We know increasing E(photon) will result in more excess electron kinetic energy. But how do we know whether that excess KE is either more electrons (more mass) being ejected from a surface...