Chem : endothemic & exothermic rxn
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when asked to explain exothermic & endothermic reaction in terms of bond making/breaking how do u do so ? what are the key words ?
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As Chemistry Moderators (Tinuviel and UltimaOnline), instead of
a) spoon feeding you the answers,
b) hogging/beating everyone else to the answers and not giving other students a chance to discuss,We'll therefore leave it to other students to give the answers and/or comments, and we'll only give comments and/or check the posted answers when asked to do so.
Also, for everyone who posts questions here, you should at least post what you think might be the answer, or what you understand about the question, instead of just the question itself.
This would be more helpful in your learning process. (if you just wanted model answers, you can lookup the TYS Answer Booklet; the advantage of a forum is for interactive learning).
HOWEVER, seeing how miss maple is a newcomer to the forum, we'll be more welcoming ("Welcome to the HomeWork Forum! PS. If you're looking for Chemistry, Physics, Mathematics Tuition, you can contact UltimaOnline, Eagle and Tinuviel!"), so here's a one-time discount - I'll give the full answers directly.
>>> when asked to explain exothermic & endothermic reaction in terms of bond making/breaking how do u do so ? what are the key words ? <<<
Solution :
In an endothermic reaction, the total energy taken in during the bond breaking process exceeds the total energy given out during the bond forming process, of the reaction.
In an exothermic reaction, the total energy given out during the bond forming process exceeds the total energy taken in during the bond breaking process, of the reaction.
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Here's a A+ explainations. Don't take it too seriously
The following is an actual question given on university of Washington chemistry mid term paper. The answer by one student was so ‘profound’ that the professor shared it with colleagues, via the internet, which is, of course, 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 based on their individual beliefs and using Boyle’s Law (gas cools when it expands and heats when compresses). One student however, wrote the following -
First, we need to know how the mass of hell is changing in 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. Most 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 that the souls in hell to increase expeditiously. 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 to stay the same the volume of hell has to expand proportionally 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 and all hell will break loose. (2) If hell is expanding at a rate faster than the increase of souls in hell, them the temperature and pressure will drop until hell freezes over. So which is it? If we accept the postulate given to me by Teresa 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 did sleep with her last night, then the number two must be true, and thus I am sure that hell is exothermic and has already frozen over. The corollary of this theory is that since hell has frozen over, it follows that no more souls are going there and it is therefore, extinct, leaving only heaven, thereby confirming the existence of a divine being which explains why, last night, Teresa kept shouting 'Oh my God!'The student received an A -