Search found 21 matches

by Raymond_Guan_1H
Sat Mar 18, 2017 1:24 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Final 2014 Question 3A
Replies: 3
Views: 368

Final 2014 Question 3A

How do we know to use Zn, rather than Cu or Fe as the anode for the cell diagram?
by Raymond_Guan_1H
Thu Mar 16, 2017 10:09 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: 2013 Final Q4 Part A
Replies: 2
Views: 286

2013 Final Q4 Part A

How do I get n=4 for part A in question 3? I thought it was the amount of electrons, but I can't seem to get 4.
by Raymond_Guan_1H
Thu Mar 16, 2017 8:31 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7666
Views: 1036268

Re: Post All Chemistry Jokes Here

any jokes about oxygen and potassium?

I mean they're OK. nothing special.
by Raymond_Guan_1H
Thu Mar 16, 2017 8:28 pm
Forum: Balancing Redox Reactions
Topic: 2013 Final Q3 Part A
Replies: 1
Views: 208

2013 Final Q3 Part A

For part A, I don't understand how the E(cell) ends up being 0.31V because don't you do E(cathode)-E(anode) to get E(cell). So you would do +1.64V - (-1.33V) and that would get 2.97V. Is this an error or am I doing something wrong?
by Raymond_Guan_1H
Wed Mar 15, 2017 3:22 pm
Forum: *Alkanes
Topic: Alkanes vs. Alkenes
Replies: 1
Views: 259

Alkanes vs. Alkenes

Can someone explain the difference of Alkanes and Alkenes?
by Raymond_Guan_1H
Wed Mar 15, 2017 3:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 214
Views: 101879

Re: Saying Thank You to Dr. Lavelle

Dear Dr. Lavelle, Thank you so much for enriching my experience at UCLA by teaching chemistry. Your enthusiasm for chemistry was so refreshing each and every class period and it was a pleasure to be in your class. Despite it being quite difficult, you made it possible to learn the material fully and...
by Raymond_Guan_1H
Tue Feb 14, 2017 8:00 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Midterm Winter 2013 Problem 5B
Replies: 1
Views: 205

Midterm Winter 2013 Problem 5B

For the question it asks us to order (CHF3, CF4, CH3F, CH2F2) in increasing molar entropy?

Could someone explain why the answer is the way it is, because I thought CF4 had the smallest molar entropy and CH2F2 had the highest molar entropy?
by Raymond_Guan_1H
Tue Feb 14, 2017 7:49 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7666
Views: 1036268

Re: Post All Chemistry Jokes Here

Why do chemist like nitrates so much? Because it's cheaper than day rates.
by Raymond_Guan_1H
Tue Feb 14, 2017 4:13 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7666
Views: 1036268

Re: Post All Chemistry Jokes Here

Why did the bear dissolve in the water?

Because he was a polar bear.
by Raymond_Guan_1H
Thu Jan 19, 2017 11:52 pm
Forum: Phase Changes & Related Calculations
Topic: Chapter 8 Question 11 Part B [ENDORSED]
Replies: 1
Views: 204

Chapter 8 Question 11 Part B [ENDORSED]

How would you know to use the w(variable pressure) equation when the information is only stating it's expanding reversibly and isothermally?
by Raymond_Guan_1H
Thu Jan 19, 2017 11:25 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Chapter 8 #5 [ENDORSED]
Replies: 2
Views: 321

Re: Chapter 8 #5 [ENDORSED]

Another way to think of it is to use DeltaU = q + w since the energy in the cylinder is used as heat and the piston is also exerting work on it. Thus, you can find the internal energy.
by Raymond_Guan_1H
Sat Dec 03, 2016 5:22 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: What is Ka2?
Replies: 1
Views: 325

What is Ka2?

I came across a question on one of the past midterms asking for a reaction that represents Ka2 for sulfurous acid (H2SO3). What exactly is Ka2?
by Raymond_Guan_1H
Sat Dec 03, 2016 1:22 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Henderson-Hasselbalch Equation
Replies: 3
Views: 717

Henderson-Hasselbalch Equation

When is it a allowed to use henderson-hasselbalch equation? Is it when the molarity is fairly low or high? I'm stilled just confused a bit about it.
by Raymond_Guan_1H
Tue Nov 22, 2016 5:28 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH and pOH difference
Replies: 1
Views: 1751

pH and pOH difference

What exactly is the difference between pH and pOH? Is one only for hydroxide and the other hydronium? What is the scale for pOH?
by Raymond_Guan_1H
Sun Nov 13, 2016 4:13 pm
Forum: Administrative Questions and Class Announcements
Topic: Thanksgiving Break [ENDORSED]
Replies: 1
Views: 418

Thanksgiving Break [ENDORSED]

If we have a discussion section that would typically meet during the break, should we attend a different discussion section that week?
by Raymond_Guan_1H
Sun Oct 30, 2016 9:52 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7666
Views: 1036268

Re: Post All Chemistry Jokes Here

What's the charge of cations?

They are "paw"sitive
by Raymond_Guan_1H
Sun Oct 23, 2016 11:47 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Noble Gases and Electron Affinity
Replies: 3
Views: 496

Noble Gases and Electron Affinity

I understand that electron affinity increases as we move right and up the periodic table. However, since noble gases have full outer shells of electrons, do the trends of this table not apply to them? Or is there a special rule of certain noble gases and their electron affinity?
by Raymond_Guan_1H
Mon Oct 17, 2016 10:45 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7666
Views: 1036268

Re: Post All Chemistry Jokes Here

Did you hear the rumor that Sodium was dating Chloride?

Na, I would take that rumor with a grain of salt.
by Raymond_Guan_1H
Sun Oct 09, 2016 10:58 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation
Replies: 1
Views: 196

Rydberg Equation

Can someone explain to me how and when to use the Rydberg equation? I'm confused on the real application and what it is used to find. Is it only used when given the wavelengths of hydrogen atoms, or can it be used for every element?
by Raymond_Guan_1H
Thu Sep 29, 2016 8:26 pm
Forum: Properties of Light
Topic: Wave Particle Duality
Replies: 3
Views: 412

Wave Particle Duality

I understand that light is considered both a wave as well as a particle but when it comes to solving equations, when would you use the wave equation versus the equation for particles? Are they able to be used interchangeably or does it depend on what form of light they are asking you to evaluate for?

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