Qualification > Sciences
CHEM AND BIO HELP AND TIPS HERE
Vin:
okay thanks so they are basically asked in paper 3 right??
i hav a mini vacation before chemistry paper3 (10 days off!!) so tht might give me time to learn them properly
im strong with the rest of organic tho..
thanks..
K_M:
--- Quote from: nid404 on May 03, 2010, 06:03:24 pm ---Cystic fibrosis is an inherited disease which affects the lungs and digestive system. It results from mutation in a gene responsible for making a protein which is involved in the transport of ions across cell boundaries.
The effect is to produce a sticky mucus which clogs the lungs and can lead to serious infection. A similar sticky mucus also blocks the pancreas (a part of the digestive system) which provides enzymes for breaking down food. This gets in the way of the processes which convert the food into molecules which can be absorbed by the body.
--- End quote ---
thank you soo much Nid! That really helped! =)
Ghost Of Highbury:
--- Quote from: sd7764 on May 04, 2010, 07:24:22 am ---okay thanks so they are basically asked in paper 3 right??
i hav a mini vacation before chemistry paper3 (10 days off!!) so tht might give me time to learn them properly
im strong with the rest of organic tho..
thanks..
--- End quote ---
Ur welcome.
haris94:
--- Quote from: Shooting Star on May 03, 2010, 10:45:38 pm ---Thanks haris, now i understand the calculations part, however I dont quite understand why mg is the limiting reagent and how can we know if it has been used up? Other than this, you didnt answer how many moles of the other reagent (in this case ethanoic acid) are left unreacted.
By the way, do u knw any good websites on moles?
--- End quote ---
limiting reagent is the reactant which will be used up first (fewer number of moles), therefore causing the reaction to stop
in this case there r fewer moles of mg than ch3cooh. so mg will get used up and then since there is no more mg, reaction is stopped
as to the moles of ch3cooh, i hv written that out of 0.5 moles, 0.4 will be used. so the unreacted ch3cooh is 0.1 moles.
$H00t!N& $t@r:
--- Quote from: haris94 on May 04, 2010, 09:22:35 am ---limiting reagent is the reactant which will be used up first (fewer number of moles), therefore causing the reaction to stop
in this case there r fewer moles of mg than ch3cooh. so mg will get used up and then since there is no more mg, reaction is stopped
as to the moles of ch3cooh, i hv written that out of 0.5 moles, 0.4 will be used. so the unreacted ch3cooh is 0.1 moles.
--- End quote ---
THANKS ALOT!! I totally understand it now!
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