2007-10-23 20:28:09 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
An exotherm is heat created during a chemical reaction.
2007-10-23 20:30:36 · answer #1 · answered by doctor_T 2 · 0⤊ 0⤋
In thermodynamics, the word exothermic describes a process or reaction that releases energy in the form of heat. Its etymology stems from the Greek prefix ex-, meaning “outside” and the Greek word thermein, meaning “to heat”. The opposite of an exothermic process is an endothermic process, one that absorbs energy in the form of heat. The term “exothermic” was coined by Marcellin Berthelot.
The concept is frequently applied in physical sciences to e.g. chemical reactions, where chemical bond energy is converted to thermal energy (heat).
http://en.wikipedia.org/wiki/Exothermic
2007-10-24 00:51:36 · answer #2 · answered by Anonymous · 0⤊ 0⤋
An Exothermic reaction is one that releases heat and into the surrounding environment. A negative change in Enthalpy.
An Endothermic reaction on the other hand is one that absorbs heat from the surrounding environment. A positive change in Enthalpy
2007-10-23 20:42:47 · answer #3 · answered by Hutty 2 · 0⤊ 0⤋
It's something that gives off heat. Read this comical essay related to endothermic and exothermic:
The following is an actual question given on a University of Washington chemistry midterm. The answer was so "profound"
that the professor shared it with colleagues, which is why we now have the pleasure of enjoying it as well.
Bonus Question: Is Hell exothermic (gives off heat) or endothermic (absorbs heat)?
Most of the students wrote proofs of their beliefs using Boyle's Law, (gas cools off when it expands and heats up when it is compressed) or some variant. One student, however, wrote the following:
First, we need to know how the mass of Hell is changing with time. So we need to know the rate at which souls are moving into Hell and the rate at which they are leaving. I think that we can safely assume that once a soul gets to Hell, it will not leave. Therefore, no souls are leaving.
As for how many souls are entering Hell, let's look at the different religions that exist in the world today. Some of these religions state that if you are not a member of their religion, you will go to Hell.
Since there are more than one of these religions, and since people do not belong to more than one religion, we can project that all souls go to Hell.
With birth and death rates as they are, we can expect the number of souls in Hell to increase exponentially.
Now, we look at the rate of change of the volume in Hell; because Boyle's Law states that in order for the temperature and pressure in Hell to stay the same, the volume of Hell has to expand as souls are added.
This gives two possibilities:
1. If Hell is expanding at a slower rate than the rate at which souls enter Hell, then the temperature and pressure in Hell will increase until all Hell breaks loose.
2. Of course, if Hell is expanding at a rate faster than the increase of souls in Hell, then the temperature and pressure will drop until Hell freezes over. So which is it?
If we accept the postulate given to me by Ms. Teresa Banyan during my Freshman year--"...that it will be a cold day in Hell before I sleep with you."--and take into account the fact that I still have not succeeded in having sexual relations with her, then #2 cannot be true; and thus I am sure that Hell is exothermic and will not freeze.
THE STUDENT RECEIVED THE ONLY "A" GIVEN
2007-10-23 20:42:45 · answer #4 · answered by Matt 6 · 0⤊ 0⤋
It is also a graph showing how much heat is produced by a chemical reaction at different points in time by plotting temperature versus time.
2007-10-23 20:37:39 · answer #5 · answered by Richard B 7 · 0⤊ 0⤋