biology coursework 4 2morow!!!help gcse

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tinkabell
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#1
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#1
can ne 1 tell me how to work out average percentage change in mass 4 osmosis in potatoes coursework??

plz help.needs to b dun 4 2moz
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Godmaster
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#2
Report 17 years ago
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(Original post by tinkabell)
can ne 1 tell me how to work out average percentage change in mass 4 osmosis in potatoes coursework??

plz help.needs to b dun 4 2moz

use differentiation....lol or u could just work out the mean :-p
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JuniperBlue
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#3
First, find the average change for each concentration (add up and divide by number of tries). Then work out the percentage change for the average:

Change in mass (biggest minus smallest) divided by the original mass, then multiply by 100.

Jo xx
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MC
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(Original post by tinkabell)
can ne 1 tell me how to work out average percentage change in mass 4 osmosis in potatoes coursework??

plz help.needs to b dun 4 2moz
if it needs to be done for 2moro why did you not do it earlier?
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JuniperBlue
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Maybe she's like me and better at procrastination than biology
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MC
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ok
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tinkabell
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THNXZ!! xoxox wats procrastination??lol
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JuniperBlue
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To delay or postpone action - putting something off until the last minute!
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tinkabell
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i cant do it!! can u do the 1st 1 4 me plz so i can c???
Concentration
(M)

1
1
[CENTER]INITIAL
Mass (g)
1.31
1.36
[/FINAL
Mass (g)
-0.555
-0.521
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Tek
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(Original post by JuniperBlue)
To delay or postpone action - putting something off until the last minute!
From the Latin 'cras', meaning tomorrow.
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JuniperBlue
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(Original post by tinkabell)
i cant do it!! can u do the 1st 1 4 me plz so i can c???
Concentration
(M)

1
1
[CENTER]INITIAL
Mass (g)
1.31
1.36
[/FINAL
Mass (g)
-0.555
-0.521
I'm not sure why the final masses have minuses, but I'll ignore those:

Average original mass:
1.31 + 1.36 = 2.67
2.67 divided by 2 = 1.335

Average end mass:
0.555 + 0.521 = 1.076
1.076 divided by 2 = 0.538

1.335 - 0.538 = 0.797

0.797 (change) divided by 1.335 (original) = 0.597

0.597 x 100 = average of 59.7% change

Hope this isn't too confusing!
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