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Author Topic: Chemistry P6 18/5/010  (Read 25001 times)

Offline guMnam

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Re: Chemistry P6 18/5/010
« Reply #45 on: May 17, 2010, 08:20:48 am »
hey guys i dont noe if it is a silly q but i want to noe wat is titration ??? ??? ??
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Offline WARRIOR

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Re: Chemistry P6 18/5/010
« Reply #46 on: May 17, 2010, 08:42:14 am »
titration is ued to producce a soluble salte. I.E NACL

SO USE NAOH AND HCL

BUT WE HAVE TO ADD EXACT AMOUNTS OF BOTH OF THEM TO PRODUCE A SALT OF PH7

WHY?

CAZ ITS OLUBLE..HCL  OR NAOH CAN EASILY DISSOLVE IN NACL MAKIN IT ALKALIN OR ACIDIC

SI?
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Offline sarsoora1994

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Re: Chemistry P6 18/5/010
« Reply #47 on: May 17, 2010, 08:49:55 am »
Quote
ALWAYS THE THING BEING ELECTROPLATED IS THE ON THE -VE ( ANODE) why??obviously cz the posotive metal has to be attracted to it ..DUUUUHH..

The negative electrode is the cathode, not the anode, since it attracts cations!

Thanks for the lovely tips, man.
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Re: Chemistry P6 18/5/010
« Reply #48 on: May 17, 2010, 08:51:57 am »
Quote from: sarsoora1994 on May 17, 2010, 08:49:55 am
The negative electrode is the cathode, not the anode, since it attracts cations!

Thanks for the lovely tips, man.
oopsy daizy ..gotta edit that

thanks!
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Offline guMnam

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Re: Chemistry P6 18/5/010
« Reply #49 on: May 17, 2010, 08:53:23 am »
Quote from: Kimo Jesus on May 17, 2010, 08:42:14 am
titration is ued to producce a soluble salte. I.E NACL

SO USE NAOH AND HCL

BUT WE HAVE TO ADD EXACT AMOUNTS OF BOTH OF THEM TO PRODUCE A SALT OF PH7

WHY?

CAZ ITS OLUBLE..HCL  OR NAOH CAN EASILY DISSOLVE IN NACL MAKIN IT ALKALIN OR ACIDIC

SI?

but i saw in ms of summer 2007 p6 the ans for q 4 (d)  is repeat titration for acurate ans
..... and i actually wrote repeat experiment and take averege
is it the same thing???
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Offline WARRIOR

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Re: Chemistry P6 18/5/010
« Reply #50 on: May 17, 2010, 09:07:23 am »
probably
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Offline The InViSiBlE GIrl (Eva)

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Re: Chemistry P6 18/5/010
« Reply #51 on: May 17, 2010, 09:09:09 am »
Hey Guys Im new here
really need help understanding this:
 KMn04 (V11) FROM PURPLE TO COLOURLESS  / K2Cr2O7 (V1) FROM ORANGE 2 GREEN / what does it mean and it turns up a lot in the paper
reply ASAP
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Offline mdwael

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Re: Chemistry P6 18/5/010
« Reply #52 on: May 17, 2010, 09:35:17 am »
which gas has a pungent smell??
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Offline guMnam

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Re: Chemistry P6 18/5/010
« Reply #53 on: May 17, 2010, 09:44:20 am »
Quote from: mdwael on May 17, 2010, 09:35:17 am
which gas has a pungent smell??
CH2O methanal :D
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Offline mdwael

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Re: Chemistry P6 18/5/010
« Reply #54 on: May 17, 2010, 09:45:55 am »
Quote from: gumnam on May 17, 2010, 09:44:20 am
CH2O methanal :D

then what kind of smell does ammonia have?
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Offline guMnam

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Re: Chemistry P6 18/5/010
« Reply #55 on: May 17, 2010, 09:54:48 am »
Quote from: mdwael on May 17, 2010, 09:45:55 am
then what kind of smell does ammonia have?
yea thts pungent too i was just going to add tht:P
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Offline mdwael

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Re: Chemistry P6 18/5/010
« Reply #56 on: May 17, 2010, 10:13:50 am »
Oct/nov Paper 6 chemistry question 5 part D "suggest why conc.sulphuric acid should not be used to dry ammonia" and also in the E part I checked mark scheme answer its says that the mistake correction is "tubes should be evened", explanation " liquid would be transfered to gas jar" can someone explain this to  me I didnt understand what liquid theyre talking about.
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Offline WARRIOR

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Re: Chemistry P6 18/5/010
« Reply #57 on: May 17, 2010, 10:28:17 am »
ammonia is basic and sulfuric acid is acidic..they react

tubes should be evened because INLET DELIVERY TUBE is goin inside the sulfuric acid..no it shoudl be outusde so they dont react..!
so that the gs could leave thro the other deliver tube ( outlet)
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Re: Chemistry P6 18/5/010
« Reply #58 on: May 17, 2010, 10:37:28 am »
Quote from: Dizzy on May 17, 2010, 09:09:09 am
Hey Guys Im new here
really need help understanding this:
 KMn04 (V11) FROM PURPLE TO COLOURLESS  / K2Cr2O7 (V1) FROM ORANGE 2 GREEN / what does it mean and it turns up a lot in the paper
reply ASAP
try askin hre because i dnt noe
https://studentforums.biz/index.php/topic,1411.960.html
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Offline mdwael

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Re: Chemistry P6 18/5/010
« Reply #59 on: May 17, 2010, 10:48:17 am »
Can someone give me a link to the Mark scheme of chemistry paper 6 summer 2000? I dont seem to find it at xtremepapers..
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