Search found 9 matches

Sat Mar 12, 2016 12:41 pm
Forum: Biological Examples (*DNA Structural Transitions, etc.)
Topic: Heat Capacity [ENDORSED]
Replies: 4
Views: 1105

Re: Heat Capacity[ENDORSED]

The molecule with the highest conformational flexibility will have the highest heat capacity. In other words, the molecule with the highest number of conformational possibilities will have the highest heat capacity.

Hope this helps!
Fri Mar 04, 2016 7:29 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Relieving Torsional Strain
Replies: 1
Views: 351

Re: Relieving Torsional Strain

Hello, The torsional strain is actually caused by repulsion of electrons between different groups. The eclipsed conformation happens to have the biggest repulsion because of its shape. The strain is indeed relieved when rotating from an eclipsed conformation into a staggered conformation. The stagge...
Sat Feb 27, 2016 8:21 pm
Forum: *Alkanes
Topic: Common Names
Replies: 1
Views: 205

Re: Common Names

A vinyl group is a carbon double bonded to another carbon which is also bonded to something else (e.g. C=C-R). An allyl group is similar except that an extra carbon gets added in between the second carbon and the "something else" (e.g. C=C-C-R). Hope this helps!
Sat Feb 20, 2016 11:00 pm
Forum: *Nucleophiles
Topic: Forming a Nucleophile Bond
Replies: 1
Views: 425

Re: Forming a Nucleophile Bond

Yes, the bond C-Cl bond was broken because there should only be a maximum of four bonds. Carbon's outer shell can only hold 8 electrons.
Fri Feb 12, 2016 9:32 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Practice Quiz winter 2015
Replies: 1
Views: 353

Re: Practice Quiz winter 2015

Hi, To solve this question you're going to need to use the following equation: ln\frac{k2}{k1}=\frac{Ea}{R}[\frac{1}{T1}-\frac{1}{T2}] . We first need to find Activation energy(Ea) so we change the equation to Ea=\frac{(R)(ln\frac{k1}{k2})}{\frac{1}{T1}-\frac{1}{T2}} . You plug in th...
Fri Feb 05, 2016 9:15 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Question About Variations of the Nernst Equ.
Replies: 2
Views: 419

Re: Question About Variations of the Nernst Equ.

The 0.0257 comes from plugging in and solving for (R*T)/F at 25 degrees Celsius. 0.0257 is used when using ln as opposed to log 10 . If you want to convert to log, you multiply 0.0257 and ln(10). The product of these two is 0.0592 and can be found in the variation of the Nernst equation that uses th...
Fri Jan 29, 2016 2:04 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Entropy of Aqueous Solutions/Ions/Compounds
Replies: 1
Views: 3066

Re: Entropy of Aqueous Solutions/Ions/Compounds

Aqueous solutions have a higher entropy than solids because there is more disorder and a greater number of possible positions and arrangements. Entropy increases in the following general order: solids, liquids, aqueous solutions, and gasses.
Thu Jan 21, 2016 6:19 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: irreversible reactions
Replies: 1
Views: 332

Re: irreversible reactions

Hey Mathew,

Irreversible reactions actually can, and many times do, occur spontaneously. They can't, however, be reversed into their original reactants. Examples of irreversible reactions are combustion reactions whose products cannot react with each other to create the reactants.
Sun Jan 10, 2016 11:06 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capacity
Replies: 1
Views: 258

Re: Heat Capacity

The change in temperature in either the Celsius or Kelvin scale is equal to 1 unit (degree Celsius or Kelvin) because they have the same magnitude. To convert from degrees Celsius to Kelvin you add 273 to the degrees Celsius. This simple addition results in the same magnitude. For example, 25 degree...