Can you tell which of these are exothermic or endothermic reactions?
Answer:
Here is an example;
Is hell exothermic or endothermic?
First, We postulate that if souls exist, then they must have some mass. If they do, then a mole of souls can also have a mass. So, at what rate are souls moving into hell and at what rate are souls leaving? I think we can safely assume that once a soul gets to hell, it will not leave.
Therefore, no souls are leaving. As for souls 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, then you will go to hell. Since there are more than one of these religions and people do not belong to more than one religion, we can project that all people and 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 in volume in hell. Boyle's Law states that in order for the temperature and pressure in hell to stay the same, the ratio of the mass of souls and volume needs to stay constant. Two options exist:
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.
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 quote given to me by Theresa Manyan during Freshman year, "that it will be a cold night 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 Option 2 cannot be true...Thus, hell is exothermic.
H2 react voilently with O2 to produce water under some condition. Its an exothermic reaction.
Exo means evolve i.e. in these type of reaction heat is released.
e.g. C + O2 -------> CO2 + heat
Its not specific heat you should be concerned about, its enthalpy or heat of reaction. Enthalpy is a measure of the total work done by a system. Heat of reaction is the change in enthalpy during a reaction. If it gives off energy (usually thermal energy i.e. it gets hot) it is exothermic, if it takes in energy (takes in heat for the reaction to work) its endothermic. So usually if a reaction is spontaneous (it happens without adding energy) its exothermic. So in the above case if you put hydrogen and oxygen together nothing happens. The reaction only makes water when you add energy (in this case in the form of electricity). Another way to make an educated guess is by entropy, which is a whole other question in itself so look it up. Lastly sometimes you can tell by phase change. So when things go from solid to liquid, the liquid has more internal energy than the solid(ie the particles have more ke and move around faster), thus it must take in energy, so melting is an endothermic process. Freezing is an exothermic process by the same argument, internal energy must be released.
the reaction is exothermic...look at it this way. Water is a very stable molecule. Hydrogen and oxygen love to make water and do it readily. Water is hard to break apart, so in order to break it apart, heat must be put into the system which would make it endothermic. Since your question is about forming water, it is the reverse reaction and it would be exothermic, or give off heat to the environment.
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