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Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 354255 times)

Offline NightHawkerr

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1170 on: May 17, 2010, 06:47:19 pm »
Guys, in chem, when they ask you to draw a "smooth line", i saw in the marking schemes, that they draw curves. How the hell are we supposed to know that they mean curve when they themselves have stated that we draw a smooth line?! ???
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Offline DEGO

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1171 on: May 17, 2010, 06:47:32 pm »
NOV 2000 PAPER 6 chem: Q3 B(ii) i dont understand y is it drwn over the original line aint it less soluble so it take more time to crystalise so this means as time increase temp decrease r8????!!!!
thts y i hate teacher made ms not sure of its answer i wish u cn get me original ms if u can also THX IN ADVANCE
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Offline Ghost Of Highbury

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1172 on: May 17, 2010, 06:49:47 pm »
@Fastal - im not sure i can do that now...my scanner is in my parent's room...and they're sleeping now...i hope i cud help, ill definitely try though..
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Offline NidZ- Hero

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1173 on: May 17, 2010, 06:51:24 pm »
 wats de differenece in heating and warming HELP ??? ??? ???
thanz
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Offline Baladya

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1174 on: May 17, 2010, 06:51:36 pm »
Can anyone plz tell me wtf is the diff between Galvanising and Sacrificial protection????  >:(
Thank you :)
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Offline SNA

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1175 on: May 17, 2010, 06:52:13 pm »
Quote from: NightHawkerr on May 17, 2010, 06:47:19 pm
Guys, in chem, when they ask you to draw a "smooth line", i saw in the marking schemes, that they draw curves. How the hell are we supposed to know that they mean curve when they themselves have stated that we draw a smooth line?! ???

smooth line means to draw a smooth curve. it means not draw a crooked line with a ruler.
if the question says straight line,then need to use ruler.

:D
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Offline Baladya

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1176 on: May 17, 2010, 06:52:39 pm »
Quote from: Nidzzz on May 17, 2010, 06:51:24 pm
wats de differenece in heating and warming HELP ??? ??? ???
thanz

Heating is to give it energy to the boiling point. Warming is little energy

No srry wait. Heating is to give it lots of energy (like about 70 or warever) but warming is little (like maybe 20C) u get what i mean?
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1177 on: May 17, 2010, 06:52:49 pm »
Quote from: DEGO on May 17, 2010, 06:47:32 pm
NOV 2000 PAPER 6 chem: Q3 B(ii) i dont understand y is it drwn over the original line aint it less soluble so it take more time to crystalise so this means as time increase temp decrease r8????!!!!
thts y i hate teacher made ms not sure of its answer i wish u cn get me original ms if u can also THX IN ADVANCE

IF ITS LESS SOLUBE IT MEANS THAT IT DISSOLVES AT HIGHER TEMPERATURES.

THEREFORE WHEN YOU COME TO COOL IT DOWN... IT CRYSTALLISES AT HIGHER TEMPERATURE ..THATS WHY ITS ABOUVE!! CZ CRYSTALS APPEARS AT HIGHER TEMPERATURES


SI?
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Offline SNA

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1178 on: May 17, 2010, 06:53:52 pm »
Hello.............
can sumone help me in chem??

im always confused when to use "warm" the solution or "heat" the solution.
i tot it did not matter.apparently it does.
how do you know which one to use?

thanks!!
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1179 on: May 17, 2010, 06:54:47 pm »
if i use mg powder insted of mg ribbon with same vol and conc of acid

the rate will increase but will the total temperture rise at the end of reaction incrase?

someone asnwer my question! Please? ::)
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Offline Ghost Of Highbury

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1180 on: May 17, 2010, 06:56:37 pm »
I dont think so..because the no. of particles of Mg reacting with the acid will be the same..
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Offline Kim

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1181 on: May 17, 2010, 06:56:55 pm »
@ kimo-no the final temperature will remain the same
the only difference wud be that the final temp wud be reached faster wen compared to the ribbon
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Offline Baladya

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1182 on: May 17, 2010, 06:57:30 pm »
Quote from: Kimo Jesus on May 17, 2010, 06:54:47 pm
if i use mg powder insted of mg ribbon with same vol and conc of acid

the rate will increase but will the total temperture rise at the end of reaction incrase?

someone asnwer my question! Please? ::)

I think so...  because there will be more collision and reaction. Not sure tho;)
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Offline Baladya

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1183 on: May 17, 2010, 06:57:52 pm »
Quote from: Baladya on May 17, 2010, 06:51:36 pm
Can anyone plz tell me wtf is the diff between Galvanising and Sacrificial protection????  >:(
Thank you :)

Anyone ?
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Offline bulono

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1184 on: May 17, 2010, 06:58:01 pm »
whats the difference between corrosion and rusting??
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