Calculate energy changes from experiments or from experimental data.
Please help! I seriously don't know how to go about doing this. Thanks! any info will be much appreciated !

Question

Calculate  energy changes from experiments or from experimental data. 
Please help! I seriously don't know how to go about doing this. Thanks! any info will be much appreciated !

anonymous · Answer

by the way, the topic is rate of reaction.

frostbite · Answer

Mind to give some more information? :)

anonymous · Answer

well the question before was draw an energy profile diagram to illustrate endothermic and exothermic change. Thats all....its just 4 questions based on the rate of reaction and the teacher didnt conduct any experiments with my class. Thats why i'm so confused at this point :(

frostbite · Answer

Right. Well an endothermic process (is one in which energy is acquired as heat) at constant pressure has ∆H>0, while an exothermic process (one that releases energy as heat) at constant pressure has ∆H<0. I guess this is known?

anonymous · Answer

yes i mentioned that for question 2. Proceed...

frostbite · Answer

Yea well if you have that knowledge you can also do a energy diagram that illustrate it right?

frostbite · Answer

(just slowly trying to find out what I'm going to explain/help with ;) )

anonymous · Answer

ok sure take your time.

frostbite · Answer

Well I just write some stuff that come to my mind; say stop if I get to far away from the subject.
Beased on what I said above we most be able to illustrate how an exothermic and endothermic process could like. The idea is shown below.
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A way you can get to determine the change in enthalpy could be using an bomb calorimeter to determine the eternal energy and then just convert the answer to enthalpy.