Qualification > Sciences
CHEM AND BIO HELP AND TIPS HERE
WARRIOR:
--- Quote from: Ari Ben Canaan on June 06, 2010, 05:03:32 pm ---@Larimeeva I strongly suggest lowering your tone; we are all here to help you, but we are NOT OBLIGED to help you.
Respect others and treat them fairly; most importantly be NICE.
--- End quote ---
my headphones almost blew my ears there ! thanks ari =.= :P :P
the_grim_reaper:
--- Quote from: Lariemeeva on June 06, 2010, 04:58:39 pm ---Why is everyone misunderstanding it. Fine, let me rephrase the whole thing in a language that everyone can understand.
I know like hell that cracking goes like this [Alkanes --> Alkene + Hydrogen]. This part understood?
Now in the Mark scheme they say that the answer to my question should be Alkane --> Alkene + Alkane + Hydrogen.
Get it? Now I want to know why they stated Alkane as a product in cracking. I'm not asking for a miracle.
So here's the link, and I hope a sensible person can answer me.
https://studentforums.biz/index.php/topic,54.msg253414.html#msg253414
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Lady the mark scheme I have gives two options. alkene + alkane OR alkene + alkene + hydrogen. Now butene is the alkene and you can then have alkane which is hexane!!! What is wrong with that?? You can have an alkane as a product! As long as an alkene is made cracking is happening!!!
Now if you want to add hydrogen to it, then its butene, hydrogen and hexene (aka alkene+alkene+hydrogen)!!! You cant have an alkane here.
I'm not doing a miracle :D :D :D...
Dana:
--- Quote from: Raywin on June 06, 2010, 04:56:47 pm ---Only gases huh? Lol, ryte, so in that case we can guess how much of something is formed (the volume) using the mole ratios? Thx.. :)
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yuup, learnt that from here too :P
Raywin:
--- Quote from: MasterMath on June 06, 2010, 05:05:21 pm ---Ugh sigh :P , OFCOURSE Magnesium HYDROXIDE EXISTS OBVIOUSLY.. BUt where talking about the products when magnesium reacts with water .. its MgO :P sorry to disappoint you and your wiki :D
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Lol i tot u were trying to say tht it doesnt exist.. :P hahaha.. XD
MasterMath:
--- Quote from: Dana on June 06, 2010, 05:05:48 pm ---omg no it can form both! cuz there are diff types of lime :P slaked lime, quicklime, limestone
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Well it forms CaO :P just memorize it then :P
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