Maths formulae

Question 1

Circumference of a circle

Answer 1

Circumference = 2 pi r

Question 2

Area of a circle

Answer 2

Area = pi r squared

Question 3

Mean

Answer 3

mean = sum of data / number of data points

Question 4

Percentage change

Answer 4

Percentage change = ( new quantity - orginal quantity) / original quantity X 100

Question 5

Percentage yield

Answer 5

Percentage Yield = Actual amount/ theoretical amount x100

Question 6

Percentage error/uncertainty

Answer 6

percentage error/uncertainty = (2 x absolute uncertainty) / quantity measured x100

Question 7

Magnifiation

Answer 7

Magnification = image size / actual size

Question 8

Rf value (chromatography)

Answer 8

Rf = distance moved by the solute / distanmce moved by the solvent

Question 9

Rate

Answer 9

Rate = change in quantity / time taken

Question 10

Surafec area to volume ratio

Answer 10

Surface area to volume ratio = surface area / volume

Question 11

Proportion of polymorphic gene loci

Answer 11

Proportion of polymorphic gene loci = number of polymorphic gene loci / total number of gene loci

Question 12

Cardiac output

Answer 12

Cardiac output = heart rate x stroke volume

Question 13

Respiratory Quotient

Answer 13

Respiratory quotient (RQ) = C02 produced / O2 consumed

Question 14

Microorganism population growth

number of ecells in a population

Answer 14

Microorganism polulation growth (number of cells in population)
Nt = No x 2 to the power of n
No is the orginal # of cells in a population
n is the number of divisions

Question 15

Temperature coefficient

Answer 15

Temperature Coefficient = biomass transferred / biomss intake x 100

Question 16

Efficienecy of biomass rtransfers

Answer 16

Biomass at higher trophic level (e.g. consumer) / biomass at lower trophic level (e.g. producer)