Qualification > Sciences
BIOLOGY P32 DISCUSSION ONLY ( AS LEVEL )
XYZ91:
--- Quote from: examfreak on June 02, 2009, 12:05:47 am ---wat would be the control for the NaCl thingy?..would you say to heat the enzyme above 80 degrees to show that effect of enzyme will not work?
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If you're asked to provide a Control for the addition of NaCl specifically, I don't think you can bring in temperature ... For the Control, the only variable that you CAN change is the variable you're invesitigating the effect of; in this case, NaCl. Temperature has to stay the same.
Jalwardi:
PPL there is nothing like NaCl .. :S
XYZ91:
--- Quote from: shamanking on June 02, 2009, 12:08:58 am ---What will the source of error be?
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If it there really is usage of NaCl, I suppose you could say, pH was not maintained. Also, if there's no temperature control, you could mention that, as well.
Parallex error when reading the volume of CO2 produced if a syringe is, in fact, used to take the measurment and there's no counting of bubbles. If you do have to count bubbles, you could say there's a chance that an error could've arisen there.
XYZ91:
--- Quote from: Jalwardi on June 02, 2009, 12:32:48 am ---PPL there is nothing like NaCl .. :S
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Consider all possibilities; you never know.
Jalwardi:
DUDe this is a bio practical not a chemistry i assure u there is nothing like that if there was some thing like this the ppl who didi p31 will get it ,, trust me on this,, CIE ppl will never have major changes in pappers like this .. its just simple changes in the paper
--- Quote from: XYZ91 on June 02, 2009, 12:37:23 am ---
--- Quote from: Jalwardi on June 02, 2009, 12:32:48 am ---PPL there is nothing like NaCl .. :S
--- End quote ---
Consider all possibilities; you never know.
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