Search found 26 matches
- Fri Mar 17, 2017 9:06 pm
- Forum: *Cycloalkanes
- Topic: Diene/Triene
- Replies: 1
- Views: 1392
Diene/Triene
We never went over dienes and trienes in class right because I recall seeing a problem like this somewhere?
- Fri Mar 10, 2017 1:15 am
- Forum: *Cycloalkanes
- Topic: Cycloalkanes as subsituents
- Replies: 1
- Views: 520
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?
- 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: 3065
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.
- Sun Mar 05, 2017 8:19 pm
- Forum: *Alkanes
- Topic: Carbanions
- Replies: 1
- Views: 506
Carbanions
Are we suppose to know what alkyl/aryl carbanions are bc the self test 4.1 asks about it?
- Fri Mar 03, 2017 2:59 pm
- Forum: General Rate Laws
- Topic: Quiz 2 Thursday question
- Replies: 1
- Views: 534
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.
- Mon Feb 27, 2017 6:06 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Determining Where Hydrogen Bonds
- Replies: 5
- Views: 1080
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.
- Thu Feb 23, 2017 8:43 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Pre Equilibria
- Replies: 2
- Views: 617
Pre Equilibria
Is H20 included in pre equilibria approach? Like in problem 101 b, why was H20 not included in the answer?
- Tue Feb 14, 2017 11:02 pm
- Forum: General Science Questions
- Topic: Sig Figs
- Replies: 5
- Views: 1784
Sig Figs
When the problem says "at 25 degrees celsius," do we take that constant into account when doing sig figs?
- Tue Feb 14, 2017 6:56 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2989358
Re: Post All Chemistry Jokes Here
Happy Valentine's Day Everyone!
- 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: 447
Faraday constant
Is the faraday constant on our formula sheet wrong because it says it's 96,4853 C.mol?
- Fri Feb 10, 2017 5:11 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Derivations
- Replies: 3
- Views: 823
Re: Derivations
I believe its all fair game
- Thu Feb 09, 2017 1:16 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2989358
Re: Post All Chemistry Jokes Here
If Avogadro calls, tell him to leave his number.
- Thu Feb 02, 2017 10:21 pm
- Forum: General Science Questions
- Topic: Celsius to kelvins
- Replies: 1
- Views: 461
Celsius to kelvins
When converting from Celsius to kelvins, I always 273. But should I be adding 273.15 instead?
- 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: 458
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.
- 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: 550
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.
- 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: 923
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.
- Thu Dec 01, 2016 10:26 pm
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: 5 Percent Rule
- Replies: 4
- Views: 1213
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."
- Thu Nov 17, 2016 12:10 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Bond Order [ENDORSED]
- Replies: 2
- Views: 634
Re: Bond Order [ENDORSED]
The formula is 1/2(bonding electrons-antibonding electrons)
- Wed Nov 09, 2016 11:31 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2989358
Re: Post All Chemistry Jokes Here
How often do you post on chemistry community?
Periodically
Periodically
- Wed Nov 02, 2016 12:29 am
- Forum: Limiting Reactant Calculations
- Topic: Fall 2015 Midterm Q1A
- Replies: 2
- Views: 598
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.
- Mon Oct 24, 2016 11:28 pm
- Forum: Lewis Structures
- Topic: Octet Rule vs. Formal Charge
- Replies: 1
- Views: 720
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.
- Wed Oct 19, 2016 12:16 am
- Forum: Administrative Questions and Class Announcements
- Topic: Video Modules
- Replies: 1
- Views: 749
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!
- Sat Oct 15, 2016 6:09 pm
- Forum: Hybridization
- Topic: Memorization Tricks
- Replies: 9
- Views: 5324
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.
- Thu Oct 06, 2016 1:28 am
- Forum: *Shrodinger Equation
- Topic: Relation to sin and cos [ENDORSED]
- Replies: 1
- Views: 696
Relation to sin and cos [ENDORSED]
Can someone please explain again how this equation relates to sin and cos? Thanks
- Sat Oct 01, 2016 2:39 pm
- Forum: Empirical & Molecular Formulas
- Topic: Nitric Acid
- Replies: 1
- Views: 660
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?
- Tue Sep 27, 2016 11:48 pm
- Forum: SI Units, Unit Conversions
- Topic: SI Unit Kg
- Replies: 3
- Views: 916
SI Unit Kg
If the SI unit for mass is kg, is it preferable to leave answers in kg or just g?