Search found 13 matches
- Sat Mar 18, 2017 8:54 pm
- Forum: *Cycloalkanes
- Topic: Cyclohexane Chair Conformation with Substituents
- Replies: 2
- Views: 1476
Re: Cyclohexane Chair Conformation with Substituents
Yes, I understand that the larger molecules prefer the equatorial position. My question was more directed at the location in the conformation (in terms of which carbon atom the substituents bond to). In the chair conformation, would a propyl group be more stable at "head" of the chair, or ...
- Sat Mar 18, 2017 7:09 pm
- Forum: *Cycloalkanes
- Topic: Cyclohexane Chair Conformation with Substituents
- Replies: 2
- Views: 1476
Cyclohexane Chair Conformation with Substituents
If we are told to draw the most stable conformation of a cyclohexane molecule with multiple substituents, does the numbering of carbons (1, 2, 3, 4, 5, 6) and the placement of the substituents matter? For example, If there is a methyl group, an ethyl group, and a propyl group, is the propyl group mo...
- Sat Mar 18, 2017 9:22 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Winter 2016 Final, 4B [ENDORSED]
- Replies: 1
- Views: 419
Winter 2016 Final, 4B [ENDORSED]
Part B of question 4 asks us to determine which proposed reaction mechanisms are valid and which step within the mechanism is the slow, rate-limiting step. My questions... We cannot have an intermediate in our rate law, correct? To get rid of an intermediate, do we use the equation for the equilibri...
- Sun Mar 05, 2017 5:38 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Collision Orientation
- Replies: 1
- Views: 455
Collision Orientation
Given that molecules must collide in a certain way for a reaction to occur, how do we identify the specific orientation of a bimolecular collision?
- Fri Mar 03, 2017 2:28 pm
- Forum: *Nucleophiles
- Topic: H2O as a nucleophile
- Replies: 3
- Views: 892
Re: H2O as a nucleophile
Makes senses, thank you!!
Re: Alkanes
For alkanes with the general molecular formula: C(n)H(2n+2), Once a molecule has four or more carbons, there is not a set lewis structure. Therefore, even if we know the molecular formula, we do not necessarily know the structure. However, cycloalkanes have the molecular formula: C(n)H(2n) With this...
- Thu Mar 02, 2017 9:51 pm
- Forum: *Nucleophiles
- Topic: Ambident
- Replies: 3
- Views: 706
Re: Ambident
You can tell whether or not a molecule is ambident by looking at the lone pairs; an ambident nucleophile has lone pairs available on multiple atoms.
i.e. Thiocyanate (SCN-) has lone pairs available on both Sulfur and Nitrogen
i.e. Thiocyanate (SCN-) has lone pairs available on both Sulfur and Nitrogen
- Thu Mar 02, 2017 9:43 pm
- Forum: *Nucleophiles
- Topic: H2O as a nucleophile
- Replies: 3
- Views: 892
H2O as a nucleophile
Hello!
Quick question: Why is H2O a nucleophile?
Quick question: Why is H2O a nucleophile?
- Wed Feb 22, 2017 1:46 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: 2 step reactions
- Replies: 1
- Views: 435
Re: 2 step reactions
You should be given more information within the problem on which elementary step is slower. Just by looking at the individual steps, you do not have enough information to determine the slower step. For example, if you are given the rate law, you can determine which elementary step defines the rate l...
- Wed Feb 22, 2017 1:37 pm
- Forum: Zero Order Reactions
- Topic: Order Reactions [ENDORSED]
- Replies: 4
- Views: 819
Re: Order Reactions [ENDORSED]
The order of a reaction describes the relationship between the concentration of a species and the rate of a reaction. By examining the overall order and the individual orders of the components of a reaction, we can see which concentrations influence the rate of the reaction. We are able to see if th...
- Sat Jan 28, 2017 7:39 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Formulas
- Replies: 3
- Views: 782
Formulas
Hello!
There are many different formulas between chapters 8 and 9, and I am confused specifically as to when we use each one.
Would someone be willing to outline the various formulas and the circumstances for which they are applicable?
There are many different formulas between chapters 8 and 9, and I am confused specifically as to when we use each one.
Would someone be willing to outline the various formulas and the circumstances for which they are applicable?
- Sat Jan 28, 2017 6:00 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: 9.43 on finding the final temperature when it is not given
- Replies: 2
- Views: 672
Re: 9.43 on finding the final temperature when it is not given
This equation comes from the formulas to solve for enthalpy. At a constant pressure (which we have in this problem), we can use the equation q=(n)(Cp)(DeltaT) to solve for enthalpy. We know that the two water samples will release/absorb heat at an equal rate. Allowing q(h) to denote the enthalpy of ...
- Fri Jan 13, 2017 10:10 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Isolated Systems [ENDORSED]
- Replies: 3
- Views: 918
Re: Isolated Systems [ENDORSED]
While an argument could, in theory, be made to say that a high quality thermos is a closed system, we ultimately would choose to consider to be an isolated system because the insulation of the thermos captures the heat to a fairly strong degree. Therefore, very minimal heat, if any, is lost from the...