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VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: physics on November 08, 2010, 12:27:30 pm

Title: determining if a reaction is exo or endo
Post by: physics on November 08, 2010, 12:27:30 pm
insight 2010,,
they give the reaction H2 + I2 <--> 2HI 
K=48.1 @ 460degrees

how do we know that this reaction is exothermic..

i assumed it was endothermic because 2 reactants becoming one would usually be endothermic because it uses a lot of energy to force 2 molcules to become 1... but i gues i was wrong :'(
Title: Re: determining if a reaction is exo or endo
Post by: m@tty on November 08, 2010, 12:32:18 pm
Do they give any other information? You can't tell for sure from that.
Title: Re: determining if a reaction is exo or endo
Post by: jasoN- on November 08, 2010, 12:46:27 pm
Read the first line of the question
"Consider the following exothermic reaction."
Title: Re: determining if a reaction is exo or endo
Post by: physics on November 08, 2010, 12:47:54 pm
SORRY I TOTALLY MISSED THAT =D
Title: Re: determining if a reaction is exo or endo
Post by: cameron_15 on November 08, 2010, 06:58:17 pm
Quote from: jasoN- on November 08, 2010, 12:46:27 pm
Read the first line of the question
"Consider the following exothermic reaction."

Haha awesome!

Bring your highlighters in Thursday everyone!

We all make these silly mistakes, highlighting important information certainly helps minimize them.
Title: Re: determining if a reaction is exo or endo
Post by: Martoman on November 08, 2010, 06:59:09 pm
I read the question out loud every time. Never miss anything that way.
Title: Re: determining if a reaction is exo or endo
Post by: m@tty on November 08, 2010, 07:00:52 pm
What about in the exam? Still read quietly to yourself, or not?
Title: Re: determining if a reaction is exo or endo
Post by: samiira on November 08, 2010, 08:11:44 pm
Quote from: m@tty on November 08, 2010, 07:00:52 pm
What about in the exam? Still read quietly to yourself, or not?

LOL!