Search found 25 matches

by Yasmine Choroomi 2C
Mon Mar 13, 2017 11:45 am
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Cis vs. Trans
Replies: 1
Views: 258

Cis vs. Trans

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!!
by Yasmine Choroomi 2C
Mon Mar 06, 2017 10:20 am
Forum: *Electrophiles
Topic: Is F a electrophile or nucleophile?
Replies: 3
Views: 604

Re: Is F a electrophile or nucleophile?

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!
by Yasmine Choroomi 2C
Fri Mar 03, 2017 12:38 pm
Forum: *Alkynes
Topic: Structures
Replies: 1
Views: 435

Structures

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?...
by Yasmine Choroomi 2C
Mon Feb 27, 2017 2:08 pm
Forum: *Nucleophiles
Topic: Ambident Nucleophiles
Replies: 1
Views: 193

Ambident Nucleophiles

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

Thanks!
by Yasmine Choroomi 2C
Mon Feb 20, 2017 11:26 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 15318

Re: Quiz 2 Winter 2017

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 :)
by Yasmine Choroomi 2C
Mon Feb 13, 2017 2:06 pm
Forum: Zero Order Reactions
Topic: Zero order
Replies: 5
Views: 640

Re: Zero order

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).
by Yasmine Choroomi 2C
Mon Feb 06, 2017 12:20 pm
Forum: Phase Changes & Related Calculations
Topic: Balancing Equations/When To Use Integers and When Not To?
Replies: 3
Views: 320

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

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.
by Yasmine Choroomi 2C
Mon Jan 30, 2017 12:29 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Degeneracy
Replies: 4
Views: 593

Re: Degeneracy

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.
by Yasmine Choroomi 2C
Tue Jan 24, 2017 8:59 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Homework 9.23
Replies: 1
Views: 239

Homework 9.23

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 ...
by Yasmine Choroomi 2C
Mon Jan 23, 2017 10:36 am
Forum: Calculating Work of Expansion
Topic: R vs. kB
Replies: 1
Views: 252

R vs. kB

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

Thanks!
by Yasmine Choroomi 2C
Tue Jan 17, 2017 1:13 pm
Forum: Phase Changes & Related Calculations
Topic: phase changes [ENDORSED]
Replies: 3
Views: 459

Re: phase changes [ENDORSED]

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!
by Yasmine Choroomi 2C
Thu Jan 12, 2017 4:53 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Question 8.59
Replies: 1
Views: 185

Question 8.59

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...
by Yasmine Choroomi 2C
Tue Jan 10, 2017 5:40 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018733

Re: Post All Chemistry Jokes Here

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.
by Yasmine Choroomi 2C
Mon Nov 28, 2016 2:43 pm
Forum: Polyprotic Acids & Bases
Topic: 2013 Practice Final #7A
Replies: 3
Views: 681

Re: 2013 Practice Final #7A

You are able to do that because that is one of the log rules. log(ab)=log(a) +log(b)!
by Yasmine Choroomi 2C
Sun Nov 20, 2016 1:50 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Percent Decomposition
Replies: 1
Views: 3946

Percent Decomposition

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!
by Yasmine Choroomi 2C
Mon Nov 14, 2016 2:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Practice 3Quiz Prep 1
Replies: 1
Views: 328

Re: Practice 3Quiz Prep 1

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!!
by Yasmine Choroomi 2C
Wed Nov 09, 2016 2:46 pm
Forum: Naming
Topic: ligand naming question [ENDORSED]
Replies: 2
Views: 328

Re: ligand naming question [ENDORSED]

yeah so you basically put all the ligands before the tm and you order them alphabetically!!
by Yasmine Choroomi 2C
Mon Oct 31, 2016 12:33 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond Order
Replies: 2
Views: 319

Re: Bond Order

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!
by Yasmine Choroomi 2C
Mon Oct 24, 2016 12:45 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018733

Re: Post All Chemistry Jokes Here

I heard oxygen and magnesium are going out and i was like OMg!!!
by Yasmine Choroomi 2C
Sat Oct 22, 2016 2:43 pm
Forum: Resonance Structures
Topic: Resonance vs. Lewis Structure?
Replies: 9
Views: 974

Resonance vs. Lewis Structure?

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!!
by Yasmine Choroomi 2C
Mon Oct 17, 2016 9:48 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018733

Re: Post All Chemistry Jokes Here

i wish your name was avagadro...because then i would already know your number ;)
by Yasmine Choroomi 2C
Mon Oct 10, 2016 2:32 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Duality of the electron
Replies: 2
Views: 580

Re: Duality of the electron

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.
by Yasmine Choroomi 2C
Tue Oct 04, 2016 10:04 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg vs. En equation for H atom
Replies: 1
Views: 548

Rydberg vs. En equation for H atom

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 :)
by Yasmine Choroomi 2C
Mon Sep 26, 2016 9:01 pm
Forum: SI Units, Unit Conversions
Topic: Significant Figures in Answer
Replies: 2
Views: 331

Re: Significant Figures in Answer

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...
by Yasmine Choroomi 2C
Fri Sep 23, 2016 12:14 pm
Forum: Empirical & Molecular Formulas
Topic: Mole Ratio: Whole Number Ratios vs. Decimal Ratios
Replies: 3
Views: 6556

Mole Ratio: Whole Number Ratios vs. Decimal Ratios

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 ...

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