OMG CHEMISTRY UNIT 1 PAPER!!!!!!!!!!!!

[instaexam]

err no, the question asked for temperature change and not enthalpy change and temperature change doesn't change if you increase the volume as long as its the same concentration

 

[Mewan95]

oh and omg what did you guys write for how to show that excesss was addedddd ?

I wrote since 1 mole of the Al compound was reacted with 2 moles of acid to form 1 mole of the product..since there is and extra mole of acid left to use, we can show that the acid was added in excess..it makes sense..dunno if its correct though.

 

[OrlandoBloom<3]

You do make sense but I think the question asked on the practical procedure and not calculation method , I hope you know what I mean

 

[OrlandoBloom<3]

err no, the question asked for temperature change and not enthalpy change and temperature change doesn't change if you increase the volume as long as its the same concentration

It does effect the no. of moles

 

[OrlandoBloom<3]

You had to write that

increases cuz there is more shielding and more repulsion. Also the force of attraction from the nucleus is less so more energy is needed to add the electron. Thats what i think as i did not know we had affinity x.x

less energy is released since electron affinity is an exothermic process

 

[Mewan95]

You do make sense but I think the question asked on the practical procedure and not calculation method , I hope you know what I mean

Yeah i get it..If thats the case i am so screwed..lol..but how can u practically show it? i mean u can show that the solution is still acidic by using a pH meter. lol i don;t know any other way.

 

[OrlandoBloom<3]

I know I hated that question so so much , I wrote some stupid crap that made no sense at all -.- what did you write for the importance of cracking process in the industries ?

 

[Mewan95]

I know I hated that question so so much , I wrote some stupid crap that made no sense at all -.- what did you write for the importance of cracking process in the industries ?

Smaller hydrocarbons are more useful, and smaller hydrocarbons are easier to make products with...i know..the 2nd one doesnt make sense..lol..

 

[instaexam]

It does effect the no. of moles

yeh sure it does but it doesn't affect the temperature change which was the question

 

[Wearewhoweare]

You had to write that
less energy is released since electron affinity is an exothermic process

only the first electron affinity is exothermic the rest are endothermic

 

[OrlandoBloom<3]

Hahaha yeah I wrote that too that smaller fractions are more useful than heavier ones . I read in the text book right now that alkenes are obtained from the cracking of alkanes so that could have been one of the answers but I didnt write in the exam The second point I wrote was to obtain hydrogen

 

[svenas]

check this guys:
http://answers.yahoo.com/question/index?qid=20090119201857AA5Bd4D

 

[svenas]

How can it not effect the temperature if its effecting the enthalpy change , they are all related

check the link I thnk u r ryt..I wrote 1/5

 

[OrlandoBloom<3]

check the link I thnk u r ryt..I wrote 1/5

Yes haha thanks alot for the link , I guess it explains my theory pretty well

 

[OrlandoBloom<3]

only the first electron affinity is exothermic the rest are endothermic

Yes exactly and the question was talking about the first electron affinities

 

[Mewan95]

check this guys:
http://answers.yahoo.com/question/index?qid=20090119201857AA5Bd4D

U jus put a smile on my face. lol...

 

[OrlandoBloom<3]

okay so since that one is figured what else was there ? I actually liked the MCQ oh was phophorus a giant atomic structure or a small molecular ?

 

[svenas]

okay so since that one is figured what else was there ? I actually liked the MCQ oh was phophorus a giant atomic structure or a small molecular ?

I guess giant

 

[OrlandoBloom<3]

oh I wrote giant as well , but it was atoms not ions btw

 

[Mewan95]

I guess giant

2nd time u made me smile...hahahaha! xD I guessed that one..lol