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# biology coursework 4 2morow!!!help gcse watch

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
2. (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
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
4. (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?
5. Maybe she's like me and better at procrastination than biology
6. ok
7. THNXZ!! xoxox wats procrastination??lol
8. To delay or postpone action - putting something off until the last minute!
9. 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
10. (Original post by JuniperBlue)
To delay or postpone action - putting something off until the last minute!
From the Latin 'cras', meaning tomorrow.
11. (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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