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Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 354063 times)

Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1965 on: May 24, 2010, 06:09:58 pm »
Quote from: A@di on May 24, 2010, 06:05:53 pm
B?

@baladya - Hydrogen from cracking, erm. Ethane --> Ethene + Hydrogen , this is the only way ..

one more , but no hydrogen, cracking though

Decane --> pentane + ethene + propene


yeah

have u ever seen  A BASE REACT WITH METAL? nop

anyway probably it was heated..but that was the only logic asnwer


displacemet reaction can occur with salts yes i kno

but im not sure with metal oxdie and another metal
« Last Edit: May 24, 2010, 06:12:03 pm by Kimo Jesus »
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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1966 on: May 24, 2010, 06:10:16 pm »
Quote from: Moonlyte on May 24, 2010, 06:07:57 pm
Do they provide us with the reactivity series list in chemistry paper 1 igcse?

No they dont.
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Offline The Golden Girl =D

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1967 on: May 24, 2010, 06:10:28 pm »
Quote from: Baladya on May 24, 2010, 06:03:48 pm
Octane ---> Hexane + ethene
Thats what the book says... so when is it an alkene and when hydrogen?
isma3 hwa 3ala hasab il su2al ,k!

meaning : ...if they give u an alkAne --> alkAne ,then there is alkEne with it

and if they give u an alkAne --. alkEne then there is hydrogen with it
 ;)
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1968 on: May 24, 2010, 06:10:47 pm »
Quote from: Kimo Jesus on May 24, 2010, 06:05:30 pm

BOTH ARE METALS !!

METAL OXIDE IS A BASE

METALS DONT REACT WITH METAL OXIDE :/

Quote from: Kimo Jesus on May 24, 2010, 06:09:58 pm
yeah

but metal oxide dont react with metal?

OBVIOUSLY THEY CAN ! if the reacting metal is more reactive

6Na  +  Al2O3  ---->  3Na2O  +  2Al
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Offline Ghost Of Highbury

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1969 on: May 24, 2010, 06:11:36 pm »
Quote from: Moonlyte on May 24, 2010, 06:07:57 pm
Do they provide us with the reactivity series list in chemistry paper 1 igcse?

nope, remember it this way.

popular scientist can make a zoo in the low humidity countryside more satisfactory.Goodbye.

potassium
sodium
calcium
magnesium
aluminium
zinc
iron
tin
lead
hydrogen
copper
mercury
silver
gold
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1970 on: May 24, 2010, 06:12:29 pm »
Quote from: Moonlyte on May 24, 2010, 06:07:57 pm
Do they provide us with the reactivity series list in chemistry paper 1 igcse?

I am afraid not .. :( then what would have been the point of testing us ? :P
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Offline Baladya

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1971 on: May 24, 2010, 06:12:52 pm »
Quote from: the golden girl on May 24, 2010, 06:10:28 pm
isma3 hwa 3ala hasab il su2al ,k!

meaning : ...if they give u an alkAne --> alkAne ,then there is alkEne with it

and if they give u an alkAne --. alkEne then there is hydrogen with it
 ;)


I think ur right
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Offline Moonlyte

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1972 on: May 24, 2010, 06:12:57 pm »
Quote from: Ari Ben Canaan on May 24, 2010, 06:10:16 pm
No they dont.

uh-oh...i'm doomed :'(
Thanks.
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1973 on: May 24, 2010, 06:13:13 pm »
oh ok cheers i got It !
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1974 on: May 24, 2010, 06:13:49 pm »
Quote from: A@di on May 24, 2010, 06:11:36 pm
nope, remember it this way.

popular scientist can make a zoo in the low humidity countryside more satisfactory.Goodbye.

potassium
sodium
calcium
magnesium
aluminium
zinc
iron
tin
lead
hydrogen
copper
mercury
silver
gold

LOL ... XD LMAO !!! :D :D !! AWESOME !! XD LMAO !! thanks man .. u saved us !
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Offline Moonlyte

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1975 on: May 24, 2010, 06:14:57 pm »
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Offline Ghost Of Highbury

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1976 on: May 24, 2010, 06:15:59 pm »
Quote from: ~VIN1094~ on May 24, 2010, 06:13:49 pm
LOL ... XD LMAO !!! :D :D !! AWESOME !! XD LMAO !! thanks man .. u saved us !

LOL, this was posted by some1 long long time ago..

here there are more

THIS IS VERY IMPORTANT FOR ELECTROLYSIS, AS IN WHICH CATION/ANION GOES TO THE ELECTRODE FIRST

for cations reactivity series:
please-K
send-Na
cats-Ca
monkeys-Mg
and-Al
zebras-Zn
in-iron
large-lead
hired-H
cages-Cu
make-Hg
sure-Ag
padlocked-platinum

for anions:
someone -sulphate
nice-nitrate
only-hydroxide(gives oxygen on oxidation)
cleans-chloride
broken -bromide
items-iodide

-----------

the lower ones break free/move to the electrode first, in both the cases.
« Last Edit: May 24, 2010, 06:37:06 pm by A@di »
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Offline Baladya

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1977 on: May 24, 2010, 06:17:35 pm »
lol tommorow m gonna get totally screwed in the molles question >.<  ;D ;D ;D


Edit: O wait... TOMMOROW IS PAPER 1 NO MOLLES OMG YESSSSSSSSSS  ;D ;D ;D ;D ;D

Lol thank goddd. I m gonna spend the 10 days holiday doing molles xD
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Offline The Golden Girl =D

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1978 on: May 24, 2010, 06:18:21 pm »
Quote from: Lariemeeva on May 24, 2010, 06:06:31 pm
@the golden girl: Right, thanks for the answer, what about Q13, why is the UI colourless for OH-?


guys help  ???
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Offline Baladya

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1979 on: May 24, 2010, 06:19:12 pm »
Quote from: the golden girl on May 24, 2010, 06:18:21 pm

guys help  ???

what is the universal indicator?
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