Chemistry Unit 3 exam discussion here >>>>

[RedRose91]

OMMMGGGGG....
+30 ?????
i did -30
oohh daaamnnn i guess i found my damn mistake....

how did u know it was +30 ????

 

[U stalking ME]

OMMMGGGGG....
+30 ?????
i did -30
oohh daaamnnn i guess i found my damn mistake....

how did u know it was +30 ????

it was endothermic....the temp decreased from 22 to 12 so +30 kj/mol

 

[shoaeb]

what i did was -30 - (-34)=4

 

[U stalking ME]

what i did was -30 - (-34)=4

it wasnt - 30 it was +30........endothermic

 

[shoaeb]

Definetly re-sitting..
whose giving unit 3b physics on friday

 

[U stalking ME]

me

 

[shoaeb]

hows it going

 

[U stalking ME]

hows it going

will start studying in a while
hows urs goin??

 

[shoaeb]

didnt start yet :/..

 

[Stoner]

it was

it was 64 kj/mol

+94Kj/mol coz the =30 was supposed to be multiplied by 2.

 

[shoaeb]

if you have any notes you can just send them to me thru the inbox..cause i am really craving for them

 

[shoaeb]

it was
+94Kj/mol coz the -34 was supposed to be multiplied by 2.

LOOOOOOOOOOOOOL
dayumn!

 

[Stoner]

delta H1 was +30 kj/mol
delta H2 was - 34 kj/ mol
delta Hr was = delta H1 - delta H2
= 30 - (-34) = 64 kj/mol

No H1 was 2(30) so Hr = 2(30)-(-34) = 94kj/mol

 

[Zifa]

delta H1 was +30 kj/mol
delta H2 was - 34 kj/ mol
delta Hr was = delta H1 - delta H2
= 30 - (-34) = 64 kj/mol

Hey its actually 2(30) - (-34) coz the question said the potassium hydrogen carbonate was times 2 i think, 2KHCO3 or sumthing so 64 is wrong. but i hated the crucible question!

 

[shoaeb]

i dont know what i wrote in the crucible question xD
i didnt even know how to answer them
when they asked how would it affect when the sodium bromide jumped out blah blah lol

 

[Stoner]

what did u guys get 4 the % uncertainty? was it 0.29%?

 

[Zifa]

OMMMGGGGG....
+30 ?????
i did -30
oohh daaamnnn i guess i found my damn mistake....

how did u know it was +30 ????

the temp change was endothermic i.e it reduced

 

[shoaeb]

yea i got something like that
0.2 something..dont remember

 

[Zifa]

what did u guys get 4 the % uncertainty? was it 0.29%?

i got that

 

[Zifa]

wat abt the improvement question??? wat did anyone write for that??