Thursday, 16 May 2013

4.10 understand that chemical reactions in which heat energy is given out are described as exothermic and those in which heat energy is taken in are endothermic

In an exothermic reaction heat is given out. Because bonds are made which gives out energy.
Think expelled; exit; exo.

In a endothermic reaction heat is taken in. Because bonds are Broken which requires energy.


  1. i think it is the other way around?

  2. Wow, thank you! That was a bit silly ;P

  3. Hannah you have it written correctly

  4. i think she's changed the exothermic/ endothermic bit but forgot to change the other bit. so i think its exothermic makes heat energy while breaking bonds (not making them)