Qualification > Sciences
chem paper 1 doubt
annie_angel:
--- Quote from: Q80BOY on May 20, 2009, 03:14:20 pm ---
--- Quote from: annie_angel on May 20, 2009, 03:11:55 pm ---
--- Quote from: Q80BOY on May 20, 2009, 03:09:41 pm ---
--- Quote from: annie_angel on May 20, 2009, 03:07:59 pm ---the co2 escapes...
--- End quote ---
isnt that why we have an airlock ?? for the CO2 to escape?
--- End quote ---
air LOCK is dere so oxygen doesnt anter or else ethanol would oxidise....or we would get sumthing else [ethanoic acid i think]
but not ethanol
--- End quote ---
The airlock is used to allow CO2 out and prevent O2 and bacteria entering the fermentation jar, thus allowing anaerobic respiartion to occur.
why is the cotton needed? and where is it placed?
--- End quote ---
A- a conical flask with cotton wool at its mouth containing sugar sol and yeast,not being heated...it says at its mouth...and i think its used for letting co2 escape
MaNa:
I guess its B bcuz uu doo need to heat the yeast till
30 degree celcius
bcuz below that its inactive n more then that its destroyed
annie_angel:
but temperature isnt specified
Q80BOY:
the question says: which apparatus is most suitable for producing ethanol by fermentation?
my text book and notes say that CO2 escapes from the airlock, no cotton wool is mentioned
are u sure its cotton wool ?? :-\
MaNa:
yea
which means its room temperature
w8 it should be 18-20 degree
so yea now it make sence why it is A
with heat
bcuz room temperature is 24 degree
n soo it fermentatrion will carry on
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