My Opera
Le Chatelier's principle in practice
Wednesday, September 30, 2009 8:01:59 PM
Hi everyone! 
In this post I won't show you computer related things , but one of the most important science: chemistry. I'm afraid I must stress that I like (very much) of science, so the next posts we'll discuss other areas of knowledge like physics, mathematics, biology, and so on.
There is a principle called Le Chatelier's Principle. Basically in chemistry, the principle is used to manipulate the outcomes of reversible reactions, often to increase the yield of reactions. In pharmacology, the binding of ligands to the receptor may shift the equilibrium according to Le Chatelier's principle thereby explaining the diverse phenomena of receptor activation and desensitization. In economics, the principle has been generalized to help explain the price equilibrium of efficient economic systems. In simultan equilibrium systems, phenomena could occur, which are in apparent contradiction to Le Chatelier's principle; these can be resolved by the theory of Response reactions.... but it doesn't matter in this text
Here, an example, that was put in FUVEST exam (2002). The FUVEST is considered the most competitive vestibular, and one of the most demanding. It applies for candidates willing to study at University of Sao Paulo (USP) in Brazil:
Bellow, the text of the question:
The Chickens don't perspire and in the summer the frequency of your breathing increases to chill your body. The main elimination of carbon dioxide, through your breathing, makes that your eggshells that is made, principally, of calcium carbonate becomes thinner. To understanding this phenomena, you have to consider this chemical equilibrium.
The question is: In the summer, to the chicken's eggshells doesn't look thinner, it have to eat:
a) water + NaCl (salt)
b)Ration with less calcium
c)water + CO2
d)water + vinegar (RCOOH)
e)atmosphere containing CO2
Answer: Look, it's very interesting. We have to see the fourth equation. If we have more CO2, then the balance will shift to left (Le Chatelier Principle). It will increase the amount of H2CO3. Now, look the third equation: As we see, we have much more H2CO2 than HCO3, then the balance will shift to left. Repeating this steps at equation II and I, we got the answer, that is "c". If you don't understanding, in the end (equation I), the balance is shifted to right (increase CaCO3 = eggshell).
See you in the next post!
--
Emanuel Valente a.k.a epaduel
http://facebook.com/epaduel
http://twitter.com/epaduel
In this post I won't show you computer related things
, but one of the most important science: chemistry. I'm afraid I must stress that I like (very much) of science, so the next posts we'll discuss other areas of knowledge like physics, mathematics, biology, and so on.There is a principle called Le Chatelier's Principle. Basically in chemistry, the principle is used to manipulate the outcomes of reversible reactions, often to increase the yield of reactions. In pharmacology, the binding of ligands to the receptor may shift the equilibrium according to Le Chatelier's principle thereby explaining the diverse phenomena of receptor activation and desensitization. In economics, the principle has been generalized to help explain the price equilibrium of efficient economic systems. In simultan equilibrium systems, phenomena could occur, which are in apparent contradiction to Le Chatelier's principle; these can be resolved by the theory of Response reactions.... but it doesn't matter in this text
Here, an example, that was put in FUVEST exam (2002). The FUVEST is considered the most competitive vestibular, and one of the most demanding. It applies for candidates willing to study at University of Sao Paulo (USP) in Brazil:
Bellow, the text of the question:
The Chickens don't perspire and in the summer the frequency of your breathing increases to chill your body. The main elimination of carbon dioxide, through your breathing, makes that your eggshells that is made, principally, of calcium carbonate becomes thinner. To understanding this phenomena, you have to consider this chemical equilibrium.
The question is: In the summer, to the chicken's eggshells doesn't look thinner, it have to eat:
a) water + NaCl (salt)
b)Ration with less calcium
c)water + CO2
d)water + vinegar (RCOOH)
e)atmosphere containing CO2
Answer: Look, it's very interesting. We have to see the fourth equation. If we have more CO2, then the balance will shift to left (Le Chatelier Principle). It will increase the amount of H2CO3. Now, look the third equation: As we see, we have much more H2CO2 than HCO3, then the balance will shift to left. Repeating this steps at equation II and I, we got the answer, that is "c". If you don't understanding, in the end (equation I), the balance is shifted to right (increase CaCO3 = eggshell).
See you in the next post!
--
Emanuel Valente a.k.a epaduel
http://facebook.com/epaduel
http://twitter.com/epaduel
