CHEMISTRY COMMUNITY

Yasmine Choroomi 2C

Hi! When trying to name something cis vs trans, do you look at the atomic number atom by atom or do you look at everything attached to each side of the double bond?

Thank you!!

Yasmine Choroomi 2C

F is an electrophile because it needs one more electron to get the full octet. However, F- is a nucleophile because it would have an extra electron to give up!

Yasmine Choroomi 2C

Hi! For triple bonds, are you allowed to draw the structure like /\/\/\/\ and then put the triple bond on one of the diagonals? because in the book for number 1.11c which is (CH3)2CHCCCH2CH3 the drawing shows one straight long segment with the triple bond parallel to it. How do you know which to do?...

Yasmine Choroomi 2C

Hi! Do ambident nucleophiles depend on resonance, lone pairs, or electronegativity? Can someone explain why SCN- and CN- are ambident?

Thanks!

Yasmine Choroomi 2C

Hi! I know you said we need to know number 9, but it has to do with enzymes and I thought we didn't need to know that?

Also are there any examples of using the equilibrium approach problems in the book?

Thanks :)

Yasmine Choroomi 2C

Also, when looking at a zero order reaction in terms of mechanisms, they are not present in the reactant portion and only the intermediates are in that portion (if you wanted to look at it from a mechanism standpoint).

Yasmine Choroomi 2C

You use fractions when you are calculating things like heat of formation (which is for one mole of whatever you want to form). Whenever you want to calculate one mole of something, everything else becomes a fraction. Otherwise you can use integers.

Yasmine Choroomi 2C

You can also calculate degeneracy by doing the number of possible places (states) to the power of the total number of particles! Ex: You have 2 particles that can go in one of 3 spaces. W=3^2=9.

Yasmine Choroomi 2C

Hi! Number 23 says: Which would you expect to have a higher molar entropy at T=0: single crystals of BF3 or of COF2? Why I got the answer which is COF2 but the solution manual has a different reason. The book says that COF2 is more disordered because it is possible for the fluorine and oxygen atoms ...

Yasmine Choroomi 2C

Hi! What's the difference between R and kB? I know that R=kB times avogadros but when do you use it?

Thanks!

Yasmine Choroomi 2C

Going from a solid to a liquid is endothermic and heat is absorbed! because we look at everything in terms of the system, delta H is positive because heat must go in!

Yasmine Choroomi 2C

Hi! So I'm confused on why do we add the heat of formations for products but subtract those of the reactants? According to the course reader it says we add energy for bonds broken and subtract energy for bonds formed. But arent reactants breaking bonds? so shouldn't they have a positive value not ne...

Yasmine Choroomi 2C

Wanna hear a joke about sodium?
Na

I have many chemistry jokes, I'm just afraid I won't get a good reaction

All the good chemistry jokes argon.

Yasmine Choroomi 2C

You are able to do that because that is one of the log rules. log(ab)=log(a) +log(b)!

Yasmine Choroomi 2C

How do you calculate the percent decomposition in general? An example of a question like this is number 47b, and it wants you to find the percent decomposition given an ICE problem.

Thanks!

Yasmine Choroomi 2C

Hi! To convert from mols to pressure you use the ideal equation: PV=nRT; where n is number of mols and P is pressure. make sure everything is in SI units!!

Yasmine Choroomi 2C

yeah so you basically put all the ligands before the tm and you order them alphabetically!!

Yasmine Choroomi 2C

Hi! It's actually the higher the bond order the stronger the bond. So a bond order of three is stronger than a bond order of 1 because a triple bond is shorter and stronger than a single bond!

Yasmine Choroomi 2C

I heard oxygen and magnesium are going out and i was like OMg!!!

Yasmine Choroomi 2C

Hi! How do you know when you're just supposed to draw one lewis structure vs. when you're supposed to draw every lewis structure to show resonance? Do you just always draw all possible structures or if it just says draw lewis you draw only one but if it says show resonance you draw all?

Thanks!!

Yasmine Choroomi 2C

i wish your name was avagadro...because then i would already know your number ;)

Yasmine Choroomi 2C

The Heisenberg Equation shows the particle like nature of light. The equation is to find the indeterminacy of momentum and and position, which we'd only be able to do if light were to behave as a particle.

Yasmine Choroomi 2C

Hi! So i noticed the R in the En equation for the H atom is 3.29E15 but the R equation in Rydberg is 1.097E7. Are they different variables entirely? Are we allowed to use the Rydberg equation in this class instead of En equation?

Thanks :)

Yasmine Choroomi 2C

your answer should always reflect the number of significant figures equal to the substance with the lowest number of sig figs in the problem! so if the problem gives two values, one with 3 sig figs and one with 2 sig figs you go with two sig figs (if the problem included mult/dividing not adding and...

Yasmine Choroomi 2C

Hi! I got this question while looking at F9 in the textbook by the way. So I know that you cant have decimals when writing empirical formulas, but are you allowed to when it asks for the mole ratio? Also when writing the mole ratio does it matter whether you put it in whole numbers or leave it as a ...

CHEMISTRY COMMUNITY

Search found 25 matches

Cis vs. Trans

Re: Is F a electrophile or nucleophile?

Structures

Ambident Nucleophiles

Re: Quiz 2 Winter 2017

Re: Zero order

Re: Balancing Equations/When To Use Integers and When Not To?

Re: Degeneracy

Homework 9.23

R vs. kB

Re: phase changes [ENDORSED]

Question 8.59

Re: Post All Chemistry Jokes Here

Re: 2013 Practice Final #7A

Percent Decomposition

Re: Practice 3Quiz Prep 1

Re: ligand naming question [ENDORSED]

Re: Bond Order

Re: Post All Chemistry Jokes Here

Resonance vs. Lewis Structure?

Re: Post All Chemistry Jokes Here

Re: Duality of the electron

Rydberg vs. En equation for H atom

Re: Significant Figures in Answer

Mole Ratio: Whole Number Ratios vs. Decimal Ratios