Search found 15 matches

by David Sung 2H
Fri Mar 17, 2017 9:25 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Winter 2014 Q3
Replies: 4
Views: 422

Re: Winter 2014 Q3

Why is Cu(NO3)2 not considered for making a galvanic cell? Does it not also have good conducting qualities since nitrates are soluble in water?
by David Sung 2H
Fri Mar 17, 2017 7:54 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Practice Problems
Replies: 23
Views: 2174

Re: Practice Problems

Is tert-butane the same as methyl-propane?
by David Sung 2H
Fri Mar 17, 2017 6:41 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Winter 2015 Final #9A [ENDORSED]
Replies: 4
Views: 823

Winter 2015 Final #9A [ENDORSED]

For question 9A, why is the correct answer trans (E) when the 4 Carbons and respective hydrogens have a higher atomic number than the Chlorine on the opposite side?
by David Sung 2H
Fri Mar 17, 2017 12:47 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 202
Views: 63418

Re: Saying Thank You to Dr. Lavelle

Dear Dr. Lavelle,

Thank you for putting in so much effort to help us succeed in the class. Chemistry Community, peer review sessions and all other resources have been helpful for me in Chem 14A/B. I am also incredibly grateful to have a professor who teaches with passion for the subject.
by David Sung 2H
Sun Feb 26, 2017 7:52 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 882518

Re: Post All Chemistry Jokes Here

The optimist sees the glass half full. The pessimist sees the glass half empty. The chemist sees the glass completely full, half with liquid and half with air.
by David Sung 2H
Sun Feb 12, 2017 3:32 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Problem 14.15
Replies: 4
Views: 428

Re: Problem 14.15

@lilyjustine_1G I think the KOH is added to the cell diagram because an aqueous solution consisting of OH- ions is needed to supply the reaction with OH- ions. It's not added to the cathode side because Ni(OH)3 can supply with the OH- ions to Cd(OH)2 by itself. Not completely sure but this is the on...
by David Sung 2H
Wed Jan 18, 2017 8:47 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Problem 8.19
Replies: 2
Views: 290

Re: Problem 8.19

When I convert the copper into moles and use the molar specific heat for calculations, I end up with a different value for the heat than when I directly use the specific heat. Using molar specific heat, I get (500.0g Cu) * (1 mol/63.55g Cu) * (33J/K*mol) * (78K) = 20251 J for the copper. But using s...
by David Sung 2H
Sat Jan 14, 2017 2:50 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Internal Energy
Replies: 1
Views: 206

Internal Energy

Is the standard unit of internal energy in Joules or Kilojoules?
by David Sung 2H
Thu Nov 17, 2016 10:43 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Why is Pz orbital used to represent sigma bond in M.O theory? [ENDORSED]
Replies: 1
Views: 226

Why is Pz orbital used to represent sigma bond in M.O theory? [ENDORSED]

Is this experimentally determined, or is there a specific reason why it is the Pz, and not any of the other p orbitals that represent the sigma bond in Molecular Orbital theory?
by David Sung 2H
Tue Nov 01, 2016 6:50 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 882518

Re: Post All Chemistry Jokes Here

I once told a chemistry joke. There was no reaction.
by David Sung 2H
Sun Oct 30, 2016 9:46 pm
Forum: Trends in The Periodic Table
Topic: Electron affinity
Replies: 5
Views: 544

Re: Electron affinity

Do the noble gases have a high electron affinity even if they have a complete octet? Ex: Comparing Ne and Cl, which has a higher electron affinity? Electron affinity is the energy released when an extra electron is added. Knowing that noble gases have a complete octet and is at its lowest energy st...
by David Sung 2H
Sun Oct 23, 2016 11:37 pm
Forum: Quantum Numbers and The H-Atom
Topic: Electrons having same energy between same shell?
Replies: 1
Views: 244

Electrons having same energy between same shell?

On page 42 of the textbook it reads, "There are one 2s- and three 2p-orbitals in this shell; in hydrogen, they all have the same energy."

How come there is no energy difference between two different orbitals? Does this also apply to other elements or is it just hydrogen?
by David Sung 2H
Sun Oct 16, 2016 10:51 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 882518

Re: Post All Chemistry Jokes Here

Are you a neuron?

Cause you got lots of action potential!
by David Sung 2H
Sun Oct 09, 2016 10:00 pm
Forum: *Black Body Radiation
Topic: Examples of Black Body Radiation
Replies: 4
Views: 2325

Examples of Black Body Radiation

What is an example of black body radiation? Does it occur naturally or can it only be found in laboratory settings?
by David Sung 2H
Thu Sep 29, 2016 8:42 pm
Forum: Properties of Light
Topic: Wave Particle Duality
Replies: 3
Views: 392

Re: Wave Particle Duality

I remember that Professor Lavelle mentioned that when dealing with optics, use light as a wave, and use light as a particle when dealing with atoms and electrons.

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