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AS Chemistry- helping each other out!

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Original post by jshep000
%age error = error/reading (x100)
So if error of 0.5cm^3, and you're measuring 20cm^3 of liquid. You do 0.5/20 (x100)


ohh right thanks that seems easy but when will you do times the error twice and the time by measuring and divide 100
Good luck guys :smile: just hope that this exams wasn't anything like the bio or physics paper


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Reply 2982
Original post by Shadowfire123
which way does the arrow point for formation and combustion and also to find enthalpy change


You should know this ..

Combustion is down.
formation is up.
Original post by Dinaa
You should know this ..

Combustion is down.
formation is up.


the stress is making me forget now


thank you
Original post by dinaa
you should know this ..

Combustion is down.
Formation is up.


omd r e k t. Shots fired
Reply 2985
Original post by Shadowfire123
woow you should know this


And I haven't done unit 1 in a while
Original post by jshep000
omd r e k t. Shots fired


haha i know
Fk I hate exams, i get all nervous in the morning and I legit can't eat anything without feeling like I'm going to throw up. Then in my exam 10 mins in, my belly rumbles lmao gg
Original post by Dinaa
And I haven't done unit 1 in a while



always think ppm is 10 to power 6
Original post by ahsan_ijaz
Good luck guys :smile: just hope that this exams wasn't anything like the bio or physics paper


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hoipe so too
Reply 2990
Original post by Shadowfire123
haha i know


My teacher made us remember it like this:

Formation ^up in heaven.
combustion down in hell (earth) l0l so silly
Original post by Dinaa
My teacher made us remember it like this:

Formation ^up in heaven.
combustion down in hell (earth) l0l so silly


thanks lool it helps
Reply 2992
Original post by jshep000
Fk I hate exams, i get all nervous in the morning and I legit can't eat anything without feeling like I'm going to throw up. Then in my exam 10 mins in, my belly rumbles lmao gg


same omg because of panic attaxks and all That crap my system turns down food.

im burmt out in the exam 😑

I was so confiddnt about thjs but ive frgtten stufff
Original post by Dinaa
My teacher made us remember it like this:Formation ^up in heaven.combustion down in hell (earth) l0l so silly




for example ppm 20ppm in blood pasma find how much in 100g of plasma

so you know 20=1000000

?=100


so you 20 times 100 divided by 1000000
(edited 8 years ago)
Original post by Shadowfire123
well no there is a question on this in unit 1


Oh right okay.

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Original post by Dinaa
same omg because of panic attaxks and all That crap my system turns down food.

im burmt out in the exam 😑

I was so confiddnt about thjs but ive frgtten stufff


:frown: idk what it is like I can never normally miss breakfast, but if i try to eat some food like I'll feel like I will throw up or I chew it for like 5 minutes LOL. RIP stomach. You'll be fine, just try to keep calm in there and it will all come back :tongue:
Original post by jshep000
:frown: idk what it is like I can never normally miss breakfast, but if i try to eat some food like I'll feel like I will throw up or I chew it for like 5 minutes LOL. RIP stomach. You'll be fine, just try to keep calm in there and it will all come back :tongue:


hahaha same here
Reply 2997
What is meant by relative magnitude? Of first and second IE of element X
Original post by Shadowfire123
for example ppm 20ppm in blood pasma find how much in 100g of plasma

so you know 20=1000000

?=100


so you 20 times 100 divided by 1000000


Yeah but I do it like this, 20/1000000 (x100)
Original post by Dinaa
My teacher made us remember it like this:

Formation ^up in heaven.
combustion down in hell (earth) l0l so silly


Bahahahahha :smile:

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