Qualification > Sciences
Chemistry Help HERE ONLY !!
~M.J~:
--- Quote from: kam on May 29, 2009, 06:07:19 pm ---
--- Quote from: abdulrahman101 on May 29, 2009, 05:39:03 pm ---
--- Quote from: ZeroZero82 on May 28, 2009, 10:48:27 am ---how do we know if a reaction is endothermic?!
--- End quote ---
The temp would fall, this is because it takes more energy/heat to break the bonds between the atoms, if it was exothermic, then more energy would be used to form new bonds, and the temp. raises
--- End quote ---
correct me if im wrong but i thought it was the other way round
cuz endo takes in heat so temp rises(positive)
and exo gives out heat go temp falls(negative)
--- End quote ---
the heat source always has a higher temperature than the surrounding
in a redox reaction heat is not displaced it is either produced or used up
here the temperature is referred to the surrounding not the reagents
so in an exothermic reaction heat is produced which increasaes the temp. of the surrounding so the temperature is increased
X Abdulrahman X:
Bond breaking is an endothermic process.
Bond making is an exothermic process.
sweetsh:
We don't need to know more than this about bond forming and breaking right?
X Abdulrahman X:
Nope :)
AN10:
--- Quote from: LilWayne on May 29, 2009, 05:35:30 pm ---
--- Quote from: AN10 on May 29, 2009, 05:33:58 pm ---During electrolysis, what is the effect of adding water to dilute sulfuric acid on the brightness of bulb ???
--- End quote ---
it makes the sulphuric acid more dilute, so the bulb's brightness decreases. i think
--- End quote ---
i have a confusion... i thought adding water would mean more H+ n OH- ions... so as da conc increases da bulb should becum more bright..
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version