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Exothermic and Endothermic Reactions

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Reply 40
Avatar for DeanK2
DeanK2
Laith
Neutralisation, decomposition, oxidation are exothermic.


What are you on about??

The class did a counterxample to this last week.
Reply 41
Avatar for sam161
sam161
7
Laith
Neutralisation, decomposition, oxidation are exothermic.

And combustion?
Reply 42
Avatar for sam161
sam161
7
Ah yeah, I thought that might be in there. Thanks for clearing that up =]
Reply 43
Avatar for AVAINTEX
AVAINTEX
6
Advanced Subsidiary
I know what the definitions are for these words, but how do I tell whether a reaction is exothermic or endothermic?


Exothermic reactions are
Neutralization Reactions
Decomposition


Endothermic
Ionization rections
fusion reactions
vaporizations reactions

and sure you know the positive and negative story:eyeball:
Reply 44
Avatar for DeanK2
DeanK2
AVAINTEX
Exothermic reactions are
Neutralization ReactionsDecomposition

Countereamples for both, yet decomposition is mainly endothermic.

Endothermic


:eek:


Ionization rections
fusion reactions
vaporizations reactions

and sure you know the positive and negative story:eyeball:


The endothermic and exothermic lists are terrible. Most fusion reactions are certainly exothermic considering the huge input from the government into CHemistry to get a step closer to building them. THey are insanely exothermic.

They only time you will find an endothermic nuclear fusion reaction is after a star forms elements with a nuclear mass greater than that of iron.

THE STUFF YOU MAY WANT TO KNOW FOR A _ LEVEL

Endothermic reactions.
Most decompositions.


Exothermic
Combustion
Anything of the form a +b + c... -> abc..
Most neutralisaations.
Reply 45
Avatar for AVAINTEX
AVAINTEX
6
Laith
An example of vaporisation reaction:

When you sweat, water will go from its liquid state to vapor. When it undergoes this change of state, the liquid water takes in heat from your body (cooling you down) and this heat overcomes the intermolecular forces thus turning the liquid water to vapor.


H2O(l)-----> H2O (g)
Reply 46
Avatar for DeanK2
DeanK2
Laith
Wrong, neutralisation is exothermic.


Dam. I knew I was going to put something down in the wrong table. :p:
Reply 47
Avatar for DeanK2
DeanK2
AVAINTEX
H2O(l)-----> H2O (g)


This is entropy driven and always endothermic, which is why I left iit alon from your list...
Reply 48
Avatar for AVAINTEX
AVAINTEX
6
DeanK2
The endothermic and exothermic lists are terrible. Most fusion reactions are certainly exothermic considering the huge input from the government into CHemistry to get a step closer to building them. THey are insanely exothermic.

They only time you will find an endothermic nuclear fusion reaction is after a star forms elements with a nuclear mass greater than that of iron.

THE STUFF YOU MAY WANT TO KNOW FOR A _ LEVEL

Endothermic reactions.
Most decompositions.


Exothermic
Combustion
Anything of the form a +b + c... -> abc..
Most neutralisaations.


ok thanks i will check it out :yep:
Ok, ok people I understand it now thanx lol. But hey this is the 1st time i was taught this at AS level. 1st time doing it but I understand it now. :smile:
Reply 50
Avatar for AVAINTEX
AVAINTEX
6
DeanK2
This is entropy driven and always endothermic, which is why I left iit alon from your list...


Yup

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