CHEMISTRY COMMUNITY

Khang_Tran_1O

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...

Khang_Tran_1O

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.

Khang_Tran_1O

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. ...

Khang_Tran_1O

That looks correct!

Khang_Tran_1O

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...

Khang_Tran_1O

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 ...

Khang_Tran_1O

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.

Khang_Tran_1O

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?

Khang_Tran_1O

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...

Khang_Tran_1O

Khang_Tran_1O

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...

Khang_Tran_1O

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...

Khang_Tran_1O

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!

Khang_Tran_1O

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...

Khang_Tran_1O

I believe you use Kp because when dealing with gases, you are dealing with pressure, not molar concentration like you would with aqueous ones.

Khang_Tran_1O

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 ...

Khang_Tran_1O

Hi,

The coordination number is just what is inside the bracket!

Khang_Tran_1O

Can someone please explain to me the whole concept of hybridization and when molecules get hybridized? Thank you!

Khang_Tran_1O

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...

Khang_Tran_1O

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?

Khang_Tran_1O

Thank you Brandon

Khang_Tran_1O

Lost an electron?

Better keep anion it ;)

Khang_Tran_1O

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.

Khang_Tran_1O

My TA said that they will give us a sheet with formulas, constants, and elements on it for the quiz!

Khang_Tran_1O

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...

Khang_Tran_1O

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

I'm fine with Sunday's for review.

CHEMISTRY COMMUNITY

Search found 26 matches

Re: Final Exam points

Re: Strains

Re: "Iso"

Re: IUPAC naming for 3 identical substituents

Re: Pre-Equilibrium approach

Re: Question About the 1st Order REaction Rate Law

Re: 2016 Midterm Q3

Re: midterm 2015 Q7

Re: Intensive Property

Re: Post All Chemistry Jokes Here

Re: R vs. kB

Re: Heat/Temperature

Re: Bar Vs. Atmosphere

Re: Sig Figs

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

Re: Ligands and Coordination Numbers

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

Hybridization

Re: Ionic character

Re: De Neve Study Group

Re: Ch.1 Problem 43

Re: Post All Chemistry Jokes Here

Re: Quiz 1 Prep

Re: Formula Sheet

Ch.1 Problem 43

Re: De Neve Study Group