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Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 344779 times)

Offline Baladya

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #675 on: May 14, 2010, 06:16:07 pm »
Thanks man :D ;D
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #676 on: May 14, 2010, 06:37:42 pm »
Whats the difference between electrolysis and cells?

And. When you burn  for example. ETHANOL ..AND BUTANOL till the temperature of a beaker filled with water reaches 50 * C. You burn less mass of butanol to obtain same temperature rise!. Why is that?
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Offline Fastal

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #677 on: May 14, 2010, 07:01:12 pm »
more bonds are there , and more energy is given out
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #678 on: May 14, 2010, 07:08:29 pm »
electrolysis is a process involving decomposition of an iconic compound using electrical energy .. if u use 'inert' electrodes like carbon .. if u change the electrodes to say copper, it tends to take part in the 'reaction' (electrolysis) .. you can purify copper with using copper electrodes .. u tht process too ??

making cells or batteries is slightly different .. in alkaline batteries (zinc carbon batteries) the positive electrode is manganese oxide and the negative electrode is zinc .. note tht these metals act as electrodes and an electrolyte used may be an alkali (sodium hydroxide)    

Butanol has a larger chain compared to ethanol .. due to this fact more energy is released in the process of 'burning' of butanol .. 
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #679 on: May 14, 2010, 07:13:54 pm »
Quote from: ~VIN1094~ on May 14, 2010, 07:08:29 pm
electrolysis is a process involving decomposition of an iconic compound using electrical energy .. if u use 'inert' electrodes like carbon .. if u change the electrodes to say copper, it tends to take part in the 'reaction' (electrolysis) .. you can purify copper with using copper electrodes .. u tht process too ??

making cells or batteries is slightly different .. in alkaline batteries (zinc carbon batteries) the positive electrode is manganese oxide and the negative electrode is zinc .. note tht these metals act as electrodes and an electrolyte used may be an alkali (sodium hydroxide)    

Butanol has a larger chain compared to ethanol .. due to this fact more energy is released in the process of 'burning' of butanol .. 
I get the alcohol question..but hmm

to make things clearer about electrolysis..pretend you get assked in an exam..What is the difference bettween electrolysis and cell?

i know 1 . Electrolysis converts electrical to chemical  and cells form chemical to electrical ?? <--? right??

what else?
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Offline gold_wings

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #680 on: May 14, 2010, 07:20:33 pm »
Cells produce electrical energy while electrolysis uses electricity to decompose compounds.
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Offline Baladya

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #681 on: May 14, 2010, 07:21:59 pm »
Also in electrolysis its Metal in cathode and non metal at anode while in cell its the more reactive in cathode and less reactive on anode...
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #682 on: May 14, 2010, 07:22:55 pm »

im not so sure about "Electrolysis converts electrical to chemical "
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #683 on: May 14, 2010, 07:28:46 pm »
Quote from: ~VIN1094~ on May 14, 2010, 07:22:55 pm
im not so sure about "Electrolysis converts electrical to chemical "
ill find out in a minute :P ill be bothered to open the book and check ! ill jot down all the differences then ..its a common question in IG realy
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #684 on: May 14, 2010, 07:33:30 pm »

i'll not check then .. im too lazy now to fetch my book .. =P
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #685 on: May 14, 2010, 07:35:24 pm »
why do you think i asked the question on the site in the first place  :-X :D
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #686 on: May 14, 2010, 07:45:10 pm »

LOL .. XD
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Offline Baladya

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #687 on: May 14, 2010, 07:56:43 pm »
http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2007%20Jun/0620_s07_qp_6.pdf

5)c) It says that u have to add nitric acid on the salt... Wait a minute... can an acid react with a salt 0.o and if yes, under what conditions, bla bla

Thanks :D
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #688 on: May 14, 2010, 08:04:51 pm »

i think its a test for carbon dioxide .. check in the ms .. its fo 3 mks so effervescence seen and lime water turns milky .. dunno wats fo 3rd point ..
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Offline Baladya

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #689 on: May 14, 2010, 08:11:48 pm »
So an acid CAN react with a salt.... but bases cant right?
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