Search found 26 matches

by Vista_Farkhondeh_3O
Fri Mar 17, 2017 9:06 pm
Forum: *Cycloalkanes
Topic: Diene/Triene
Replies: 1
Views: 556

Diene/Triene

We never went over dienes and trienes in class right because I recall seeing a problem like this somewhere?
by Vista_Farkhondeh_3O
Fri Mar 10, 2017 1:15 am
Forum: *Cycloalkanes
Topic: Cycloalkanes as subsituents
Replies: 1
Views: 271

Cycloalkanes as subsituents

If you have a cycloalkane as a substituent, does the prefix cyclo get included when alphabetizing? And do cycloalkanes take priority in numbering when they are substituents?
by Vista_Farkhondeh_3O
Thu Mar 09, 2017 11:05 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: Delta G Double Dagger 2 vs Ea2
Replies: 2
Views: 1171

Delta G Double Dagger 2 vs Ea2

So just to clarify, in the second transition step, Delta G double dagger 2 is the distance between TS2 and the original reactant, while Ea2 is the distance between TS2 and the intermediates? Please correct me if I'm wrong, or tell me this is right.
by Vista_Farkhondeh_3O
Sun Mar 05, 2017 8:19 pm
Forum: *Alkanes
Topic: Carbanions
Replies: 1
Views: 272

Carbanions

Are we suppose to know what alkyl/aryl carbanions are bc the self test 4.1 asks about it?
by Vista_Farkhondeh_3O
Fri Mar 03, 2017 2:59 pm
Forum: General Rate Laws
Topic: Quiz 2 Thursday question
Replies: 1
Views: 287

Re: Quiz 2 Thursday question

You do not use the pre equilibria approach if the first step is the slow step. Remember, the slow step is the rate determining step, so just write the rate law for that.
by Vista_Farkhondeh_3O
Mon Feb 27, 2017 6:06 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Determining Where Hydrogen Bonds
Replies: 5
Views: 608

Re: Determining Where Hydrogen Bonds

So if the electron is coming from the bond, make sure to place the arrow starting at the bond instead of starting at the atom.
by Vista_Farkhondeh_3O
Thu Feb 23, 2017 8:43 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Pre Equilibria
Replies: 2
Views: 359

Pre Equilibria

Is H20 included in pre equilibria approach? Like in problem 101 b, why was H20 not included in the answer?
by Vista_Farkhondeh_3O
Tue Feb 14, 2017 11:02 pm
Forum: General Science Questions
Topic: Sig Figs
Replies: 5
Views: 963

Sig Figs

When the problem says "at 25 degrees celsius," do we take that constant into account when doing sig figs?
by Vista_Farkhondeh_3O
Tue Feb 14, 2017 6:56 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019734

Re: Post All Chemistry Jokes Here

Happy Valentine's Day Everyone!
by Vista_Farkhondeh_3O
Mon Feb 13, 2017 7:34 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Faraday constant
Replies: 1
Views: 279

Faraday constant

Is the faraday constant on our formula sheet wrong because it says it's 96,4853 C.mol?
by Vista_Farkhondeh_3O
Fri Feb 10, 2017 5:11 pm
Forum: Administrative Questions and Class Announcements
Topic: Derivations
Replies: 3
Views: 405

Re: Derivations

I believe its all fair game
by Vista_Farkhondeh_3O
Thu Feb 09, 2017 1:16 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019734

Re: Post All Chemistry Jokes Here

If Avogadro calls, tell him to leave his number.
by Vista_Farkhondeh_3O
Thu Feb 02, 2017 10:21 pm
Forum: General Science Questions
Topic: Celsius to kelvins
Replies: 1
Views: 264

Celsius to kelvins

When converting from Celsius to kelvins, I always 273. But should I be adding 273.15 instead?
by Vista_Farkhondeh_3O
Mon Jan 30, 2017 1:02 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Internal energy of an isothermal system?
Replies: 1
Views: 264

Re: Internal energy of an isothermal system?

Yes delta u is equal to zero in an isothermal reaction. Since the temperature is constant, q=-w because the two cancel eachother out.
by Vista_Farkhondeh_3O
Sat Jan 21, 2017 3:56 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Born-Haber Cycle [ENDORSED]
Replies: 1
Views: 298

Re: Born-Haber Cycle [ENDORSED]

Considering Dr. Lavelle intentionally did not give us these types of problems on the hw, I assume that we will not learn it, at least in chapter 8.
by Vista_Farkhondeh_3O
Thu Jan 12, 2017 10:38 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Rounding in Hess's Law
Replies: 1
Views: 280

Rounding in Hess's Law

Do we round to the nearest whole number when calculating delta H? For example, number 8.55 rounded -15.5kJ to -16.
by Vista_Farkhondeh_3O
Thu Dec 01, 2016 10:26 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: 5 Percent Rule
Replies: 4
Views: 627

5 Percent Rule

I don't quite understand when to use the 5% rule, like when Dr. Lavelle says "If you lose $1000 from a $1,000,000 it won't make a noticeable difference."
by Vista_Farkhondeh_3O
Thu Nov 17, 2016 12:10 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond Order [ENDORSED]
Replies: 2
Views: 355

Re: Bond Order [ENDORSED]

The formula is 1/2(bonding electrons-antibonding electrons)
by Vista_Farkhondeh_3O
Wed Nov 09, 2016 11:31 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019734

Re: Post All Chemistry Jokes Here

How often do you post on chemistry community?
Periodically
by Vista_Farkhondeh_3O
Wed Nov 02, 2016 12:29 am
Forum: Limiting Reactant Calculations
Topic: Fall 2015 Midterm Q1A
Replies: 2
Views: 353

Re: Fall 2015 Midterm Q1A

Because you need 2 moles of A for every one mole of B. You only have one mole of A, so technically, you'll only be using 1/2 mole of B. A runs out before B does, making A your limiting reactant.
by Vista_Farkhondeh_3O
Mon Oct 24, 2016 11:28 pm
Forum: Lewis Structures
Topic: Octet Rule vs. Formal Charge
Replies: 2
Views: 428

Re: Octet Rule vs. Formal Charge

I believe the first priority is to make sure the formal charge is zero. Then, if you are able to form octets without compromising the formal charge you should do so.
by Vista_Farkhondeh_3O
Wed Oct 19, 2016 12:16 am
Forum: Administrative Questions and Class Announcements
Topic: Video Modules
Replies: 1
Views: 497

Video Modules

Will there be video modules posted for chapter 3? They were a great help for the last two chapters because they were very informative, yet concise. Thank you!
by Vista_Farkhondeh_3O
Sat Oct 15, 2016 6:09 pm
Forum: Hybridization
Topic: Memorization Tricks
Replies: 9
Views: 1549

Re: Memorization Tricks

Hi! For the units, my high school chem teacher said it would help if you think about it like a stair case. This way, you know which way to move your decimal. I attached a photo of the "metric stairs" to this comment.
by Vista_Farkhondeh_3O
Thu Oct 06, 2016 1:28 am
Forum: *Shrodinger Equation
Topic: Relation to sin and cos [ENDORSED]
Replies: 1
Views: 425

Relation to sin and cos [ENDORSED]

Can someone please explain again how this equation relates to sin and cos? Thanks
by Vista_Farkhondeh_3O
Sat Oct 01, 2016 2:39 pm
Forum: Empirical & Molecular Formulas
Topic: Nitric Acid
Replies: 1
Views: 427

Nitric Acid

One of the homework problems(F3) asks you to write the formula for nitric acid. How do I know derive the formula, and know whether they're asking for the molecular or empirical formula?
by Vista_Farkhondeh_3O
Tue Sep 27, 2016 11:48 pm
Forum: SI Units, Unit Conversions
Topic: SI Unit Kg
Replies: 3
Views: 499

SI Unit Kg

If the SI unit for mass is kg, is it preferable to leave answers in kg or just g?

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