Search found 30 matches

by Jimmy Zhou 3D
Sat Mar 18, 2017 11:30 pm
Forum: Balancing Redox Reactions
Topic: Winter 2013 Final Q3A
Replies: 1
Views: 238

Re: Winter 2013 Final Q3A

Yes
by Jimmy Zhou 3D
Sat Mar 18, 2017 11:28 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Chapter 3 Question 7
Replies: 1
Views: 432

Re: Chapter 3 Question 7

It depends on the stability of the conformation that you are trying to draw. You always draw staggered for most stable conformations and always draw elipse for least stable.
by Jimmy Zhou 3D
Sat Mar 18, 2017 11:24 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Final 2014 #7E and 7F
Replies: 1
Views: 418

Re: Final 2014 #7E and 7F

The important part isn't to worry about the Cl but to notice that the C(OH)3 is right next to the CN in guanche conformation. Either structure would have been acceptable as they would be equivalent in stablility in terms of conformation.
by Jimmy Zhou 3D
Wed Mar 15, 2017 1:03 pm
Forum: *Alkanes
Topic: Final 2013
Replies: 4
Views: 531

Re: Final 2013

Perhaps it is better to understand the general concept then certain structures. For example hexadecanol is a open chain of 16 carbons with an alcohol fucntional group on carbon 1. We know the naming up to 10 carbons, but we can imply that hexadcanol is 16 carbons using the prefixes. I feel like this...
by Jimmy Zhou 3D
Fri Mar 10, 2017 1:27 pm
Forum: *Alkanes
Topic: PRIORITY IN NAMING
Replies: 1
Views: 280

PRIORITY IN NAMING

I hope this link helps everyone with their naming. It gives a summary of the priorities. Basically if a functional group has higher priority, it'll take precedence in the final naming of that compound. For example, if an alkene has a carboxylic group, let's say Hexene with a carboxylic group. Since ...
by Jimmy Zhou 3D
Sun Mar 05, 2017 1:15 pm
Forum: *Electrophiles
Topic: Electrophiles and Nucleophiles for Quiz 3
Replies: 3
Views: 655

Electrophiles and Nucleophiles for Quiz 3

Just wondering,

Do we only need to know how to IDENTIFY nucleophiles and electrophiles for quiz 3 or do we also need to be able to KNOW them based on strength as a nucleophile or electrophile?
by Jimmy Zhou 3D
Sat Mar 04, 2017 11:03 pm
Forum: *Amines
Topic: Priority
Replies: 3
Views: 551

Re: Priority

I think what they are trying to say is talking about naming priority, as in, which name comes first. In this case, amines come first so in a molecule like Butanamine, and you have a double bond, the amine would have priority in the naming, and the double bond would be left out. Please correct me if ...
by Jimmy Zhou 3D
Fri Feb 24, 2017 12:57 pm
Forum: Second Order Reactions
Topic: Third Order Reactions
Replies: 5
Views: 587

Re: Third Order Reactions

also if you had a reaction with A+B+C -> products

that could be a third order reaction.
by Jimmy Zhou 3D
Fri Feb 24, 2017 12:57 pm
Forum: Second Order Reactions
Topic: Third Order Reactions
Replies: 5
Views: 587

Re: Third Order Reactions

The rate constant for a third order reaction would also be M-2 s-1 if time was given in seconds.
by Jimmy Zhou 3D
Mon Feb 13, 2017 5:37 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Midterm 2017
Replies: 2
Views: 304

Midterm 2017

Will we have to know calculations regarding a solubility constant Ksp for the test?
by Jimmy Zhou 3D
Sun Feb 12, 2017 1:30 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Winter 2017
Replies: 87
Views: 14132

Re: Midterm Winter 2017

Was wondering if any of you would be able to answer the pikachu question for Winter 2014 Final Part A
by Jimmy Zhou 3D
Sun Jan 29, 2017 10:06 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Gibbs Free Energy and Entropy
Replies: 2
Views: 250

Re: Gibbs Free Energy and Entropy

Yeah exactly, basically because the reaction is spontaneous, delta H will also tend to be negative and delta s will be positive so the reaction will be more stable as it moves from an unstable state to a stable state.
by Jimmy Zhou 3D
Mon Jan 16, 2017 1:11 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Question 8.55
Replies: 1
Views: 262

Question 8.55

So was wondering if the 2nd equation needed to be balanced cause in its current state it isn't and the problem isn't possible otherwise. Need guidance. 8.55 Barium metal is produced by the reaction of aluminum metal with barium oxide. From the standard reaction enthalpies, 2 Ba + O2 -> 2BaO delta H ...
by Jimmy Zhou 3D
Sat Jan 14, 2017 2:52 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Internal Energy
Replies: 1
Views: 206

Re: Internal Energy

The standard unit is Joules for internal energy
by Jimmy Zhou 3D
Sat Dec 03, 2016 11:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Derivations [ENDORSED]
Replies: 2
Views: 428

Derivations [ENDORSED]

What does Dr. Lavelle mean when he says no derivations on the exam?
by Jimmy Zhou 3D
Fri Nov 25, 2016 10:10 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Final Exam 2012 Q5C [ENDORSED]
Replies: 1
Views: 287

Final Exam 2012 Q5C [ENDORSED]

In the H2+I2 -><- 2HI reaction, why does removing a small amount of I2 make the reaction favor neither products or reactants?
by Jimmy Zhou 3D
Sun Nov 13, 2016 12:52 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chapter 11.29 HW
Replies: 1
Views: 239

Re: Chapter 11.29 HW

When you are saying Q do you mean Kq? the equilibrium constant. I am going to base my explanation on that fact. If Kq = 1 then the reaction would be at equilibrium and would favor neither products or reactants. The reason being in the calculation of the equilibrium constant ( products/reactants) a v...
by Jimmy Zhou 3D
Sun Nov 13, 2016 12:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Quiz 3 Prep 2014 #6
Replies: 1
Views: 197

Re: Quiz 3 Prep 2014 #6

viewtopic.php?f=123&t=16792

I answered the same question on this post already, please refer to it.
by Jimmy Zhou 3D
Sun Nov 13, 2016 12:46 pm
Forum: Ideal Gases
Topic: Quiz 3 Prep
Replies: 2
Views: 382

Re: Quiz 3 Prep

The answer to this question would be high temperature and lower pressure. If we look at the Kp equilibrium constant, it would be products/reactants. Since we want this Kp to be low so that the equation favors the products, we would want equilibrium pressure to be lower. For high temp, notice the cha...
by Jimmy Zhou 3D
Sun Oct 30, 2016 10:13 pm
Forum: Hybridization
Topic: Conceptual question
Replies: 1
Views: 195

Re: Conceptual question

Could you clarify what you mean by election promotion, I don't remember seeing it in the book or course reader.
by Jimmy Zhou 3D
Tue Oct 25, 2016 12:45 pm
Forum: Resonance Structures
Topic: (NH2)COCH3 Molecule structure
Replies: 1
Views: 343

(NH2)COCH3 Molecule structure

Hi everyone,

I'm not quite sure how to draw this molecule structure. I am unclear as to whether it should have the 2 Cs both bonded to the O in the middle or the two Cs bonded together and the O sticking out from the first C without the Hydrogens.
by Jimmy Zhou 3D
Tue Oct 25, 2016 12:43 pm
Forum: Resonance Structures
Topic: Resonance vs. Lewis Structure?
Replies: 9
Views: 928

Re: Resonance vs. Lewis Structure?

Usually, you will know that you have a resonance structure when it is obvious that the double bond in the molecule can be used interchangeably between the other atoms and the central atom.
by Jimmy Zhou 3D
Sun Oct 23, 2016 1:20 am
Forum: Student Social/Study Group
Topic: De Neve Study Group
Replies: 35
Views: 2140

Re: De Neve Study Group

What time is the study sesh happening?
by Jimmy Zhou 3D
Sat Oct 22, 2016 11:11 am
Forum: Lewis Structures
Topic: P, S, Cl accomodating more than 8 valence e-
Replies: 1
Views: 259

Re: P, S, Cl accomodating more than 8 valence e-

If we look at the Periodic Table, P, S, Cl are on the third period, which means that they can use the 3d orbital to have an expanded octet. That being said, P has 5 Valence e- S has 6 valence e- and Cl has 7 valence e-. The total number of bonds that can be made for P is 5 and for S will be 6. Usual...
by Jimmy Zhou 3D
Sun Oct 16, 2016 5:16 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Minimum Indeterminacy [ENDORSED]
Replies: 6
Views: 911

Re: Minimum Indeterminacy [ENDORSED]

In regards to why it's multiplied by 2. +-0.1 is only one arm of the indeterminancy factor. delta V refers to the both arms or sides of the indeterminancy so we must use 0.2 instead of 0.1 as velocity can either be =0.1 or -0.1.
by Jimmy Zhou 3D
Sun Oct 09, 2016 12:48 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 885012

Re: Post All Chemistry Jokes Here

Girl are you made of Copper and Tellerium? Because you sure are CuTe
by Jimmy Zhou 3D
Thu Sep 29, 2016 11:24 am
Forum: Einstein Equation
Topic: Homework 1.69 [ENDORSED]
Replies: 4
Views: 761

Re: Homework 1.69 [ENDORSED]

Hopefully we will also be able to know how many joules per eV to make the conversion
by Jimmy Zhou 3D
Thu Sep 29, 2016 11:22 am
Forum: Einstein Equation
Topic: Homework 1.69 [ENDORSED]
Replies: 4
Views: 761

Re: Homework 1.69 [ENDORSED]

Thanks for the Responses,

Maggie, your explanation makes sense however, the absorption spectra of the lithium photomultiplier is not known. I assumed from Chem Mod's work that as long as the energy emitted by the laser is higher than that of the work function, it should be fine.

Jimmy Z.
by Jimmy Zhou 3D
Wed Sep 28, 2016 11:52 pm
Forum: Einstein Equation
Topic: Homework 1.69 [ENDORSED]
Replies: 4
Views: 761

Homework 1.69 [ENDORSED]

Question is as follows: In a recent suspense fi lm, two secret agents must penetrate a criminal’s stronghold monitored by a lithium photomultiplier cell that is continually bathed in light from a laser. If the beam of light is broken, an alarm sounds. The agents want to use a handheld laser to illum...
by Jimmy Zhou 3D
Tue Sep 27, 2016 8:54 pm
Forum: Balancing Chemical Reactions
Topic: H.13 How To Write This Chemical Equation?
Replies: 4
Views: 1485

Re: H.13 How To Write This Chemical Equation?

Hi,
This is Jimmy from Lecture 1

I just got to this problem and I think the problem says 2 equations and not 3. In this case
one of the equations would be N2+O2 -> 2NO and the other would be 2NO + O2 ->2NO2

Hope this helps!

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