maths skills Flashcards
metres-millimetres-micrometres-nanometres
x1000
percentage change
percentage change= (new quanity-original quantity)/original quantity x100
percentage yield
actual amount/theoretical amount x100
percentage uncertainty
maximum error/quantity measured x100
student’s t-test
compare the difference between two means and see if it significant
chi-squared
comparing the observed results to expected results, usually categorcial data
correlation co-efficient
used to find the strength of a correlation between two sets of continuous data
magnification
image size/actual size
pulmonary ventilation rate
tidal volume x breathing rate
cardiac output
stroke volume x heart rate
NPP
NPP = GPP - R
net production of consumers
N = I - (F+R)
hardy-weinberg
p+q=1
p2+2pq+q2=1
biodiversity
d= N(N-1)/Σn(n-1)
surface area of a cube
(lxl) x 6 sides
volume of a cube
l3
surface area of a cuboid
2(lh + lw + hw)
volume of a cuboid
l x w x h
surface area of cylinder
2πr2 + 2πrh
volume of a cylinder
πr2h
y axis
dependent variable
x axis
independent variable
volume of a sphere
4/3πr3
straight line
y = mx + c
gradient
change in y/change in x
pH
pH= -log10[H+]
logarithms
logarithms are powers to which a base is raised so log100=2 and log1000=3
benefits of using ratio
allows comparison and starting amounts are different
dilution series
C1 x V1 = C2 x V2
V2 + V1 + volume of distilled water
- C1 = conc. of stock solution
- V1 = vol. of stock solution
- C2 = conc. of solution being made
- V2 = vol. of solution being made
