Qualification > Sciences
Chemistry Help HERE ONLY !!
unknown 101:
--- Quote from: thukon on May 30, 2009, 12:53:22 pm ---
--- Quote from: LilWayne on May 30, 2009, 12:45:53 pm ---
--- Quote from: 12345abc on May 30, 2009, 12:37:07 pm ---here's some problems i had:
1.how do we write overall equations,e.g for habers process?
2. rust prevention-the mechanisms
3.why is a crucible in which magnesium oxide is being made covered with a lid?
4.colour of flame when there is incomplete combustion?
5.what reacts at room temp. with ethanol and ethanoic acid?
A. CaCO3 B.CuO C.CH3OH D.Na
6.what are synthetic macromolecules?
please help!!! ???
--- End quote ---
1) i dont understand wat u mean!!
2)to prevent rust u could, paint the object, greasing or oiling, plastic coating, chromium plating, galvanizing with zinc, using stainless steel (which is corrosion resistant)
3)depends on the process if ur heating molten or aqueous substances then to prevent the splashing out of materials
4)orange = complete.. blue= incomplete
5) C), i think, cuz its the only organic substance ( ASK SOMEONE ELSE CUZ IM NOT SURE!!)
6)these are man-made polyamide and polyester eg. nylon and terylene
--- End quote ---
Lil wayne, uve got the flames mixed up. Blue is complete. Red or orange is incomplete.
The answer is not C for the other thing. I m sure, because C is methanol. Im pretty sure methanol and ethanol dont react at room temp, but i dont know the answer.
--- End quote ---
ohh yeah i just realized, if its not methanol, could it be CuO , cuz it can oxidise ethanol into ethanoic acid, right?
unknown 101:
--- Quote from: zara on May 30, 2009, 12:55:03 pm ---wait a min...
twilight said that red/orange in case of incomplete combustion....
lilwayne says:orange for complete combustion..
so now whch one is correct??
--- End quote ---
im mistaken zara
nid404:
--- Quote from: 12345abc on May 30, 2009, 12:37:07 pm ---here's some problems i had:
1.how do we write overall equations,e.g for habers process?
2. rust prevention-the mechanisms
3.why is a crucible in which magnesium oxide is being made covered with a lid?
4.colour of flame when there is incomplete combustion?
5.what reacts at room temp. with ethanol and ethanoic acid?
A. CaCO3 B.CuO C.CH3OH D.Na
6.what are synthetic macromolecules?
please help!!! ???
--- End quote ---
1.N2(g) + 3H2(g) 2NH3(g).
2.painting,galvanising,sacrificial protection, coating with plastic,using oil or grease
3.stops smoke from escaping
4.as twilight rightly said
5. with ethanol- D
with ethanoic acid-A,B,C and D
6.synthetic polymers- nylon,terylene and the like
zara:
its Na whch reacts with ethanol and ethanoic acid at room temperature...
nid404:
--- Quote from: zara on May 30, 2009, 01:05:08 pm ---its Na whch reacts with ethanol and ethanoic acid at room temperature...
--- End quote ---
oh so it asks which 1 reacts with both.....yeah so then Na
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