Wednesday, May 1, 2013

General Chemistry II Reflection

As the semester is about to end there are many valuable tips lessons I have realized are valuable to know.  The most valuable lesson I learned was not to put off studying for an exam until the week of the exam.  The first part of the semester I had more time to study during the week and it helped me to gain better knowledge of a concept.  The first exam of the semester was the easiest for me to complete because I felt I knew the material better.  I prepared myself better because I learned the material instead of trying to cram it in at the end by memorization.  I tried to do the same throughout the semester but that was harder to do since softball started taking up more of my time and that was reflected on my tests as the scores kept going down a little.

The most challenging concept for me from class was to hold myself accountable and time management.  Being a full time athlete as well as student adds on the stress that comes along with classes.  There were many times during this first year that I thought I could hang out with my friends and do my work later.  Putting off the work always turned out to hurt me.  I’d have to stay up later to do it, which didn’t allow me to fully benefit from it because I was tired and just wanted to rest.  This ultimately hurt me on a couple exams since I didn’t understand certain concepts because I didn’t always fully commit to the extra work I needed to put in.

My advice for future Chem II students is to put forth the extra effort to study or do practice problems.  It can only help you.  I didn’t always do that and it made the class more difficult.  I’ll be sure to take my own advice for future courses and find the self-motivation needed to do so.







Thursday, March 14, 2013

Blog #2

Pyruvate dehydrogenase
-the first component of the pyruvate dehydrogenase complex, it is abbreviated as E1
 
 


                 This is a cutaway view of the complex, the E1 component is the yellow

Reaction Catalyzed
 
Pyruvate dehydrogenase performs decarboxylization of pyruvate to form acetyl-CoA, this is shown in the reaction above
 
 
Active Site
 
 
Pyruvate dehydrogenase has two sites, both provide magnesium ion and thiamine pyrophosphate (TPP) as cofactors.  There is an alpha subunit and beta subunit of the E1 enzyme.  The alpha binds a magnesium ion to a pyrophosphate fragment, and the beta binds pyrimidine fragment of TPP.  This creates an active site.
 
 
 

 

Sources


*Unable to determine: chemical formula, molecular weight, and rate information


 

Thursday, February 7, 2013

Post #1



Asparagine

      IUAPC name: 2-amino-3-carbamolypropanoic acid


                                                C4H8N2O3                                                                        

 

Molecular Weight: 132.12 g


  Physical Properties
  • Melting Point: 235 °C
  • Boiling Point: 438.029 °C
  • Flashpoint: 218.712 °C
  • Density: 1.405 g/cm3 
  • Solubility: soluble in acid and alkali solution; slightly soluble in water; hardly soluble in ethanol, ethyl ether, methanol, and benzene
 
Intermolecular Forces

Dispersion forces are present in all atoms or molecules that have electrons, so asparagine exhibits dispersion forces.  The compound will have higher dispersion forces, because dispersion forces increase with increasing molar mass.  Greater dispersion forces result in increased boiling points, this is also reflected in asparagine as it has a boiling point of 438.029 °C.  In addition, dipole-dipole forces exist in asparagine because it is a polar molecule.  Hydrogen bonding also takes place.  For example, the NH2 atom has one unshared pair of electrons and can form one hydrogen bond, the oxygen atoms of C=O groups have two unshared pairs of electrons and can form two hydrogen bonds with hydrogen atoms.