Search found 14 matches
- Sun Mar 19, 2017 12:33 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 513817
Re: Saying Thank You to Dr. Lavelle
Dr. Lavelle, you have no idea how much I would want you again as a professor. You're obviously very bright, enthusiastic, but most of all, kind. You always have a smile on your face, which makes chemistry seem much less daunting. Thank you for a great quarter.
- Sun Mar 19, 2017 12:29 pm
- Forum: General Rate Laws
- Topic: Order of Steps
- Replies: 3
- Views: 746
Order of Steps
Does it affect the rate law whether the slow step or the fast step comes first?
- Sun Mar 12, 2017 11:00 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Arrows
- Replies: 1
- Views: 632
Arrows
If arrows are supposed to point from electron rich regions and go towards electron deficient regions, why are there so many examples of arrows going from hydrogen to bromine or to chlorine? Is it because the electrons first move to hydrogen and move somewhere else from there?
- Sun Mar 12, 2017 10:56 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Carbocation
- Replies: 1
- Views: 637
Carbocation
How are carbocations formed, exactly? If a hydrogen with a partial positive charge attaches to one carbon, how does another carbon end up as a cation?
- Mon Mar 06, 2017 2:36 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Energy Profiles Products and Reactants
- Replies: 1
- Views: 467
Energy Profiles Products and Reactants
In energy profiles, do we simply write out the products and reactants or do we draw them using carbon line structures? And do we need to write something in the form [C.....A.....B] (with a superscript double crossed t) as part of our energy profile?
- Mon Mar 06, 2017 2:31 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Transition States
- Replies: 1
- Views: 428
Transition States
How many transition states can an SN2 reaction have? Is there a limit?
- Sun Feb 26, 2017 10:04 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Steady-State Method
- Replies: 1
- Views: 492
Steady-State Method
Does the Steady-State method require integration? I don't quite understand how it works. And how does the Steady-State method work if there are multiple intermediates?
- Sun Feb 19, 2017 11:38 pm
- Forum: General Rate Laws
- Topic: Liquid Scintillation Counter
- Replies: 1
- Views: 484
Liquid Scintillation Counter
What is a liquid scintillation counter and how can it detect the number of high energy electrons? Why is it even necessary to detect the number of high energy electrons?
- Sun Feb 12, 2017 11:43 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram Orders
- Replies: 1
- Views: 420
Cell Diagram Orders
I know that for cell diagrams, the elements from the anode are on the left and the elements from the cathode are on the right. But amongst those anode and cathode sections, what is the order? Are the reactants on the left and the products on the right? I saw examples in the text book that indicated ...
- Sun Feb 05, 2017 11:41 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Spontaneous Reduction
- Replies: 1
- Views: 424
Spontaneous Reduction
How does a positive standard reduction potential indicate that reduction is spontaneous? Is there a specific reason? And if the standard reduction potential is negative, does that mean oxidation is spontaneous?
- Sun Jan 29, 2017 11:34 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: System vs. Surroundings with a Calorimeter
- Replies: 1
- Views: 4234
System vs. Surroundings with a Calorimeter
In a perfect system, qsys + qsurr = 0. If a reaction is taking place inside a calorimeter, is qcalorimeter the equivalent of qsurr? Or is the calorimeter also part of the system?
- Sat Jan 21, 2017 9:59 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Calorimeters [ENDORSED]
- Replies: 1
- Views: 494
Calorimeters [ENDORSED]
What are calorimeters typically made out of? And does the material that the calorimeter is made out of affect the specific heat capacity of the calorimeter significantly?
- Sun Jan 15, 2017 11:34 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Remaining Reactants
- Replies: 1
- Views: 357
Remaining Reactants
In most cases, some of the reactants won't be used up (a.k.a. They are NOT limiting reactants); does that affect the standard reaction enthalpy when one calculates delta H reaction by subtracting delta H reactants from delta H products? If so, how? Sorry for not putting the standard reaction enthalp...
- Sat Jan 14, 2017 11:44 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Sublimation
- Replies: 1
- Views: 435
Sublimation
I know that there is an enthalpy of sublimation, but it what cases would sublimation occur? How can the liquid state be skipped all together? Wouldn't the compound have to be liquid at some point as it transitions from solid to gas, even if it's only liquid for a minuscule period of time?