Search found 13 matches

by Brandon_Wu_2L
Sun Mar 19, 2017 11:26 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7337
Views: 825511

Re: Post All Chemistry Jokes Here

o chem meme.pdf
(33.53 KiB) Downloaded 48 times
by Brandon_Wu_2L
Sun Mar 19, 2017 11:11 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 200
Views: 45716

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...
by Brandon_Wu_2L
Sun Mar 19, 2017 12:45 pm
Forum: *Alkenes
Topic: Are Alkenes considered functional groups?
Replies: 1
Views: 424

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.
by Brandon_Wu_2L
Sun Mar 19, 2017 12:32 pm
Forum: Balancing Redox Reactions
Topic: Electrolysis
Replies: 1
Views: 257

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...
by Brandon_Wu_2L
Sun Mar 19, 2017 12:26 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: units of the rate of reaction
Replies: 7
Views: 352

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
by Brandon_Wu_2L
Fri Feb 24, 2017 1:05 pm
Forum: Administrative Questions and Class Announcements
Topic: 14CL
Replies: 6
Views: 755

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.
by Brandon_Wu_2L
Tue Jan 24, 2017 3:03 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Collisions of Particles
Replies: 1
Views: 260

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...
by Brandon_Wu_2L
Mon Nov 14, 2016 1:00 am
Forum: Administrative Questions and Class Announcements
Topic: Chem 14B enrollment
Replies: 2
Views: 563

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?
by Brandon_Wu_2L
Fri Oct 28, 2016 2:04 am
Forum: Lewis Structures
Topic: "best" lewis structure
Replies: 3
Views: 397

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.
by Brandon_Wu_2L
Fri Oct 21, 2016 10:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Angles of molecular shapes
Replies: 5
Views: 741

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)
by Brandon_Wu_2L
Fri Oct 14, 2016 12:00 am
Forum: Trends in The Periodic Table
Topic: Electron Affinity in Group 15
Replies: 1
Views: 1855

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...
by Brandon_Wu_2L
Thu Oct 06, 2016 10:16 pm
Forum: DeBroglie Equation
Topic: How do photons have momentum? [ENDORSED]
Replies: 4
Views: 595

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...
by Brandon_Wu_2L
Thu Sep 29, 2016 8:58 pm
Forum: Properties of Electrons
Topic: Kinetic Energy of Electrons [ENDORSED]
Replies: 4
Views: 1338

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...

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