Qualification > Sciences
Chemistry Help HERE ONLY !!
12345abc:
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!!! ???
unknown 101:
--- Quote from: nid404 on May 30, 2009, 12:35:43 pm ---so any which ways it's 20% of the total volume of air. Any method will do
--- End quote ---
could be 20% or 21%
nid404:
--- Quote from: LilWayne on May 30, 2009, 12:37:34 pm ---
--- Quote from: nid404 on May 30, 2009, 12:35:43 pm ---so any which ways it's 20% of the total volume of air. Any method will do
--- End quote ---
could be 20% or 21%
--- End quote ---
yes sir
twilight:
4.colour of flame when there is incomplete combustion?
its red or orange .. a clean flame is blue
unknown 101:
--- 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)blue = complete.. orange= 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
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