endothermic or exothermic?????

[albertlee]

For a simple example, when Mg in HCl, it realeases heat, hence the forward reaction is exothermic......

 

but why, when raising the temperature, the forward reaction goes even faster???

 

Albert

[Skye]

You seem to be thinking that for an exothermic reaction there is already excess heat, which is released during the reaction, so why would even more heat help the reaction?

 

Where you are wrong is that there isn't excess heat, but really there is excess energy in the chemical bonds that can be released during the reaction. In order to get this energy out of the bonds you first need to break them. This requires energy, often provided by heat. So by adding heat to an exothermic reaction, you break more of the chemical bonds, which allows the reaction to take place faster.

[albertlee]

thx!!!