# A2 biology rate question

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#1
The student’s results are shown in Table 3.
Table 3

Time / minutes Total volume of gascollected / cm3
10 0.3

20 0.9

30 1.9

40 3.1

50 5.0

60 5.2

Calculate the rate of gas production in cm3 g–1 min–1 during the first 40 minutes of thisinvestigation. Show your working.

Can anyone help me with this question I have tried and have got the wrong answer.

The markscheme is:

0.0155 / 0.016 = 2 marks;
0.0775 / 0.077 / 0.078 / 0.08 = 1 mark
/ 0.62 = 1 mark

Thank you
1
6 years ago
#2
1
#3
Thank you!
0
1 year ago
#4
Ok so it tells you in cm^3 g^-1 min^-1 which basically gives you the formula cm3/(gxmin)So at 40 min 3.1/(5x40) = 0.0155Hope that helps, its just the way I think about it.
1
1 month ago
#5
(Original post by Aisha Catt)
Ok so it tells you in cm^3 g^-1 min^-1 which basically gives you the formula cm3/(gxmin)So at 40 min 3.1/(5x40) = 0.0155Hope that helps, its just the way I think about it.
Where did the 5 come from when you did 5x40?
1
1 month ago
#6
(Original post by JHTY)
Where did the 5 come from when you did 5x40?
because in the question it says that 5g of yeast is used
2
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