Search found 10 matches

by Atishay_Mathur_3L
Thu Mar 16, 2017 4:33 pm
Forum: *Cyclopropanes and Cyclobutanes
Topic: Total Strain of Cyclopropane versus Cyclobutane
Replies: 1
Views: 527

Total Strain of Cyclopropane versus Cyclobutane

In lecture we discussed that the total strain for cyclopropane is approximately 28 kcal/mole, and that of cyclobutane is approximately 26 kcal/mole, which are very similar numbers. I understand that the butterfly conformation only relieves some of the torsional strain, not all, but I was wondering w...
by Atishay_Mathur_3L
Sat Mar 11, 2017 1:01 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Cis and Trans [ENDORSED]
Replies: 1
Views: 311

Re: Cis and Trans [ENDORSED]

Although triple bonds are "locked" and cannot rotate, there is no cis and trans because the carbon atoms are sp hybridized. Therefore, the molecule must be linear, so the concepts of cis and trans don't apply very well.
by Atishay_Mathur_3L
Sat Mar 04, 2017 9:22 am
Forum: *Nucleophiles
Topic: Self-Test 4.1A
Replies: 1
Views: 248

Re: Self-Test 4.1A

Hi, I- is a larger ion than Cl-, because its valance electrons lie in the energy level n = 5, while chloride has valance electrons in the n = 3 energy level. Since Iodide is less electronegative, it holds its electrons less tightly than than Chloride, allowing it to donate electron density easily, w...
by Atishay_Mathur_3L
Sun Feb 26, 2017 11:39 am
Forum: *Organic Reaction Mechanisms in General
Topic: electrophilic addition reaction
Replies: 1
Views: 294

Re: electrophilic addition reaction

I believe that Dr. Lavelle mentioned briefly that H and Br were more likely in those positions because the tertiary carbon (the carbon atom bonded to 3 other carbons) stabilizes a positive charge better than the secondary carbon (the carbon bonded to 2 other carbons). Therefore, the reaction is more...
by Atishay_Mathur_3L
Sun Feb 19, 2017 4:48 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Intermediates in Reactions
Replies: 2
Views: 223

Re: Intermediates in Reactions

I think that the steady state approximation most readily applies in situations where the intermediate exists for only a transient period of time. For example, if a reaction mechanism is: A --> I --> P, and the rate constant for the formation of intermediate (k1) is much lower than the rate constant ...
by Atishay_Mathur_3L
Sun Feb 12, 2017 10:00 am
Forum: Second Order Reactions
Topic: Second Order with Two Reactants
Replies: 1
Views: 295

Second Order with Two Reactants

Hi!

What would you plot on the x-axis and y-axis to determine whether a reaction is second order based on linearity of the resulting graph if it has two different reactants (Rate = k[A][B]), because it is clear that it can't simply be t vs ln[A]?
by Atishay_Mathur_3L
Sun Feb 05, 2017 9:13 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagram
Replies: 2
Views: 213

Re: Cell Diagram

Hi! There is no steadfast rule regarding the order of the reactants and products for the half reactions where both are in the same phase; however, for your own use, it may be helpful to write reactants on the left to products on the right in both the anode and cathode because you can clearly see the...
by Atishay_Mathur_3L
Fri Jan 27, 2017 10:53 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy of molecules with same number of atoms but different bonds
Replies: 1
Views: 201

Re: Entropy of molecules with same number of atoms but different bonds

Hi! Generally, in molecules of similar complexity, the one with a double bond will tend to have a lower entropy. A double bond is planar confined, so rotation is not possible, which restricts the possible movement of the molecule. Thus, double bonds constrain the available microstates for the molecu...
by Atishay_Mathur_3L
Sun Jan 22, 2017 10:45 am
Forum: Calculating Work of Expansion
Topic: Irreversible vs. Reversible Expansion (Question 8.11) [ENDORSED]
Replies: 1
Views: 249

Re: Irreversible vs. Reversible Expansion (Question 8.11) [ENDORSED]

Hi! An reversible and isothermal expansion does more work than an irreversible process, because in a reversible process the internal pressure and external pressure are equal at all points in time. However, infinitesimal pressure changes allow the gas to expand such that no energy is wasted in increa...
by Atishay_Mathur_3L
Fri Jan 13, 2017 8:40 pm
Forum: Phase Changes & Related Calculations
Topic: Sublimation Heating Curve
Replies: 1
Views: 264

Sublimation Heating Curve

Hello,

Is the enthalpy of sublimation for a substance the sum of its solid and liquid transitions? Or does it follow a different pathway?

-Atishay

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