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biology coursework 4 2morow!!!help gcse

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

Reply 1

Godmaster

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

Reply 2

JuniperBlue

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

Reply 3

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?

Reply 4

JuniperBlue

Maybe she's like me and better at procrastination than biology :biggrin:

Reply 5

Reply 6

tinkabell

THNXZ!! xoxox wats procrastination??lol

Reply 7

JuniperBlue

To delay or postpone action - putting something off until the last minute! :tongue:

Reply 8

tinkabell

i cant do it!! can u do the 1st 1 4 me plz so i can c???
Concentration
(M)

1
1

INITIAL
Mass (g)
1.31
1.36

[/FINAL
Mass (g)
-0.555
-0.521

Reply 9

Tek

JuniperBlue

To delay or postpone action - putting something off until the last minute! :tongue:

From the Latin 'cras', meaning tomorrow.

Reply 10

JuniperBlue

tinkabell

i cant do it!! can u do the 1st 1 4 me plz so i can c???
Concentration
(M)

1
1

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!