Search found 10 matches

by Alexis Moran2B
Sat Mar 12, 2016 1:10 am
Forum: *Cyclopropanes and Cyclobutanes
Topic: planar vs nonplanar
Replies: 1
Views: 1418

planar vs nonplanar

If a cycloalkane has a nonplanar conformation does that mean it has to be eclipsed? or can it be nonplanar and staggered? and can it be planar and eclipsed?
by Alexis Moran2B
Sun Mar 06, 2016 5:52 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Torsional & Steric Strain
Replies: 2
Views: 472

Torsional & Steric Strain

What exactly is the difference between Torsional and Steric Strain? I understand Steric strain occurs in non bounded interactions but what exactly does that mean? How are they each measured and identified in a conformation?
by Alexis Moran2B
Sun Feb 28, 2016 11:48 pm
Forum: *Alkanes
Topic: Naming using IUPAC
Replies: 1
Views: 324

Naming using IUPAC

What are the prefixes for compounds that have carbon chains made up of 11 and 12 carbons?
by Alexis Moran2B
Sun Feb 21, 2016 8:28 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Psuedo-Thermodynamic Parameters
Replies: 1
Views: 281

Psuedo-Thermodynamic Parameters

In lecture we were told in pseudo-thermodynamic parameters the standard enthalpy of activation is sometimes positive and that it is the enthalpy required to break bonds. Specifically, in pseudo-thermodynamic parameters when is the standard enthalpy of activation positive and when is it negative?
by Alexis Moran2B
Wed Feb 17, 2016 11:23 am
Forum: Second Order Reactions
Topic: Energy Barrier and Rate Constant
Replies: 1
Views: 408

Energy Barrier and Rate Constant

Why is it that a higher energy barrier means that there is a smaller rate constant?
by Alexis Moran2B
Mon Feb 08, 2016 5:43 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: E reaction vs. E cell
Replies: 1
Views: 351

E reaction vs. E cell

I'm a bit confused between the difference of E reaction which is Erxn=E cathode-E anode and the E cell which the example in the course reader says Ecell= E cu (R: cathode)- E zn (L: Anode). Are these two different equations or the same one? If they're different what exactly is the difference?
by Alexis Moran2B
Mon Feb 01, 2016 12:23 am
Forum: Balancing Redox Reactions
Topic: reversing the lower E balance?
Replies: 1
Views: 321

Re: reversing the lower E balance?

When adding the Reduction potentials E value we have to reverse one of the values because when calculating the E of the cell we are dealing with one half reaction that is a reduction reaction and another half reaction that is an oxidation reaction. The E values we are given are BOTH reduction values...
by Alexis Moran2B
Sun Jan 24, 2016 9:45 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free energy and spontaneity
Replies: 1
Views: 347

Gibbs Free energy and spontaneity

Why is it that when Gibbs free energy of the system is negative then the process is spontaneous and the delta S universal is positive? How does delta G being negative make the process spontaneous?
by Alexis Moran2B
Fri Jan 15, 2016 11:53 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Understanding the Calculations of W
Replies: 1
Views: 335

Understanding the Calculations of W

In the course reader when explaining how to calculate W (Degeneracy) it states "2 particles both in one of two states, W=4 or (2^2) 1 particle in one of two states, W=2 or (2^1) N particles each particle can be in one of two states,W=2^n" How do you know which particles are in which state?...
by Alexis Moran2B
Sun Jan 10, 2016 9:06 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpies
Replies: 1
Views: 334

Enthalpies

How do we know the standard state of elements? Meaning if they're solid, liquids or gas etc. Do we have to memorize specific elements? For example how do we know I2 is a solid? In an enthalpy problem would we be given the standard states of the elements in the equation or not?

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