Search found 26 matches

by Khang_Tran_1O
Mon Mar 13, 2017 12:46 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam points
Replies: 7
Views: 839

Re: Final Exam points

Following up on on the mention about the points for posting on Chemistry Community, does anyone know if posting twice one week could replace the point of another week of not posting? I wasn't able to post last week bc I didn't have Wi-Fi at home and my phone wasn't working. thanks in advance! I don...
by Khang_Tran_1O
Mon Mar 13, 2017 12:42 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Strains
Replies: 2
Views: 307

Re: Strains

You can refer to this to see the difference between the two strains! http://web.chem.ucla.edu/~harding/notes/strain_01.pdf But basically, I believe that torsional strains are steric strains that occurs when there are eclipsed or gauche interactions, so they are similar to each other.
by Khang_Tran_1O
Fri Mar 10, 2017 8:23 am
Forum: *Alkanes
Topic: "Iso"
Replies: 3
Views: 398

Re: "Iso"

It has "iso" because of its formation. The two carbons are connected to one at the same time rather than each connected to one another. If it was connected to each other like C--C--C in a chain, then you would call it propyl, but since it's 2 carbons connected to one, then it's isopropyl. ...
by Khang_Tran_1O
Fri Mar 10, 2017 8:17 am
Forum: *Alkanes
Topic: IUPAC naming for 3 identical substituents
Replies: 1
Views: 271

Re: IUPAC naming for 3 identical substituents

That looks correct!
by Khang_Tran_1O
Mon Feb 27, 2017 12:42 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Pre-Equilibrium approach
Replies: 1
Views: 189

Re: Pre-Equilibrium approach

As Chem_mod replied in another post: "You don't need to use the pre-equilibrium approach if the first step is a slow step. Remember, the slow step is the rate-determining step and a pre-equilibrium is when an intermediate is formed in a fast equilibrium reaction prior to a slow step in the mech...
by Khang_Tran_1O
Thu Feb 23, 2017 1:26 pm
Forum: First Order Reactions
Topic: Question About the 1st Order REaction Rate Law
Replies: 2
Views: 432

Re: Question About the 1st Order REaction Rate Law

I think you're talking about the differential rate laws because for the first order rate law, you just have to work with initial and final concentration, one of which is usually given to you. But for the differential rate laws, which I think the question is referring to, then yes you have to always ...
by Khang_Tran_1O
Tue Feb 14, 2017 3:41 am
Forum: Balancing Redox Reactions
Topic: 2016 Midterm Q3
Replies: 1
Views: 193

Re: 2016 Midterm Q3

If you look back at pg. 30 in the course reader,for ideal gas, delta U = 3/2*n*R*delta T and since it is isothermal, meaning that there is no temperature change, then delta T = 0. It being 0 then makes delta U = 0 also.
by Khang_Tran_1O
Tue Feb 14, 2017 3:26 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: midterm 2015 Q7
Replies: 3
Views: 358

Re: midterm 2015 Q7

Ethan Frankel 2C wrote:Yep! The reactant/cathode will be the higher concentration, and the lower concentration is the anode.


Can you explain why this is so?
by Khang_Tran_1O
Mon Feb 06, 2017 12:43 pm
Forum: Balancing Redox Reactions
Topic: Intensive Property
Replies: 2
Views: 336

Re: Intensive Property

Since intensive property "is a physical property of a system that does not depend on the system size or the amount of material in the system," voltage is an intensive property because it does not change due to the size of the electrode or the amount of electrons transferred. What it depend...
by Khang_Tran_1O
Sun Feb 05, 2017 2:50 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1017667

Re: Post All Chemistry Jokes Here

Image
by Khang_Tran_1O
Mon Jan 23, 2017 12:39 pm
Forum: Calculating Work of Expansion
Topic: R vs. kB
Replies: 1
Views: 252

Re: R vs. kB

Hi, I believe that you generally use it when you calculate for entropy if it concerns degeneracy (W) and arrangements of molecules. For example, in the textbook, question 9.21 asks to calculate the entropy of a solid nanostructure made of 64 molecules in which the molecules (a) are all aligned in th...
by Khang_Tran_1O
Tue Jan 17, 2017 8:43 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat/Temperature
Replies: 1
Views: 216

Re: Heat/Temperature

Hi, In thermodynamics terms, temperature indicates random motion of particles, while heat is the transfer of energy due to temperature differences. Usually, you're asked to solve for heat at constant pressure or delta H (units is kJ or kJ/mol), whereas temperature is usually part of the calculations...
by Khang_Tran_1O
Sun Jan 15, 2017 12:37 am
Forum: Student Social/Study Group
Topic: Bar Vs. Atmosphere
Replies: 1
Views: 367

Re: Bar Vs. Atmosphere

Hi,

Looking at some of the practice midterms and finals questions in the back, I noticed that some of the answers provided use atm (pg.131 & 181), so I'm assuming that we should use atm for pressure!
by Khang_Tran_1O
Wed Nov 30, 2016 12:47 pm
Forum: General Science Questions
Topic: Sig Figs
Replies: 3
Views: 668

Re: Sig Figs

I usually try to not round until the final answer, so throughout my calculations, I leave all the numbers in, even if it is long. It may be a bit meticulous, but by doing this, I've never had problems with sig figs on my quizzes and midterm. I think it's usually safe though to leave 4 numbers in aft...
by Khang_Tran_1O
Tue Nov 22, 2016 4:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: How do you know if it's Kc or Kp??
Replies: 1
Views: 266

Re: How do you know if it's Kc or Kp??

I believe you use Kp because when dealing with gases, you are dealing with pressure, not molar concentration like you would with aqueous ones.
by Khang_Tran_1O
Wed Nov 16, 2016 8:49 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands and Coordination Numbers
Replies: 2
Views: 460

Re: Ligands and Coordination Numbers

Hi, Yes! You need to know how many bonds each ligand can make so that you can find out the coordination number. In the course reader, the ones with an asterisk next to them are polydentates, meaning that they can make 2 or more bonds; you just have to memorize which makes how many. For example, for ...
by Khang_Tran_1O
Sun Nov 13, 2016 8:23 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Are the coordination numbers just inside of brackets? [ENDORSED]
Replies: 4
Views: 686

Re: Are the coordination numbers just inside of brackets? [ENDORSED]

Hi,

The coordination number is just what is inside the bracket!
by Khang_Tran_1O
Tue Nov 01, 2016 11:07 am
Forum: Hybridization
Topic: Hybridization
Replies: 2
Views: 290

Hybridization

Can someone please explain to me the whole concept of hybridization and when molecules get hybridized? Thank you!
by Khang_Tran_1O
Fri Oct 28, 2016 12:34 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic character
Replies: 1
Views: 267

Re: Ionic character

Hi Angela, The higher an element's electronegativity is, the more likely it is to create a bond with great ionic character. To compare compounds' ionic character, you would usually find the electronegativity difference between the elements. You can also usually do this on the periodic table by knowi...
by Khang_Tran_1O
Tue Oct 18, 2016 12:20 pm
Forum: Student Social/Study Group
Topic: De Neve Study Group
Replies: 35
Views: 2251

Re: De Neve Study Group

Jordan Sandoval 4L wrote:
Khang_Tran_4C wrote:I'm in Holly! We should meet up to do go over homework problems together

I'm fine with Sunday's for review.

I live in Holly and I would like to study with anyone else who lives here. It's been tricky finding other first years in the building.


What floor are you on Holly?
by Khang_Tran_1O
Tue Oct 18, 2016 12:16 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Ch.1 Problem 43
Replies: 2
Views: 474

Re: Ch.1 Problem 43

Thank you Brandon
by Khang_Tran_1O
Tue Oct 18, 2016 12:15 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1017667

Re: Post All Chemistry Jokes Here

Lost an electron?

Better keep anion it ;)
by Khang_Tran_1O
Tue Oct 11, 2016 11:33 am
Forum: Molarity, Solutions, Dilutions
Topic: Quiz 1 Prep
Replies: 2
Views: 363

Re: Quiz 1 Prep

Hi,

You would convert both masses to moles, but also convert both of them into mol Ca so that you can add the two values of mol together. You can then take the result of the addition and divide it by 0.400L to find the molarity. After finding molarity, you can compare it to 5.30X10^-3 M.
by Khang_Tran_1O
Fri Oct 07, 2016 1:58 pm
Forum: General Science Questions
Topic: Formula Sheet
Replies: 3
Views: 780

Re: Formula Sheet

My TA said that they will give us a sheet with formulas, constants, and elements on it for the quiz!
by Khang_Tran_1O
Thu Oct 06, 2016 11:17 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Ch.1 Problem 43
Replies: 2
Views: 474

Ch.1 Problem 43

Hi everyone, So this problem states: "What is the minimum uncertainty in the speed of an electron confined to within a lead atom of diameter 350. pm? How would you model the atom as a one-dimensional box with a length equal to the diameter of the actual atom?" I got the answer to the first...
by Khang_Tran_1O
Thu Sep 29, 2016 11:11 am
Forum: Student Social/Study Group
Topic: De Neve Study Group
Replies: 35
Views: 2251

Re: De Neve Study Group

I'm in Holly! We should meet up to do go over homework problems together

I'm fine with Sunday's for review.

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