maths skills

Question 1

metres-millimetres-micrometres-nanometres

Answer 1

x1000

Question 2

percentage change

Answer 2

percentage change= (new quanity-original quantity)/original quantity x100

Question 3

percentage yield

Answer 3

actual amount/theoretical amount x100

Question 4

percentage uncertainty

Answer 4

maximum error/quantity measured x100

Question 5

student’s t-test

Answer 5

compare the difference between two means and see if it significant

Question 6

chi-squared

Answer 6

comparing the observed results to expected results, usually categorcial data

Question 7

correlation co-efficient

Answer 7

used to find the strength of a correlation between two sets of continuous data

Question 8

magnification

Answer 8

image size/actual size

Question 9

pulmonary ventilation rate

Answer 9

tidal volume x breathing rate

Question 10

cardiac output

Answer 10

stroke volume x heart rate

Question 11

NPP

Answer 11

NPP = GPP - R

Question 12

net production of consumers

Answer 12

N = I - (F+R)

Question 13

hardy-weinberg

Answer 13

p+q=1
p2+2pq+q2=1

Question 14

biodiversity

Answer 14

d= N(N-1)/Σn(n-1)

Question 15

surface area of a cube

Answer 15

(lxl) x 6 sides

Question 16

volume of a cube

Answer 16

l3

Question 17

surface area of a cuboid

Answer 17

2(lh + lw + hw)

Question 18

volume of a cuboid

Answer 18

l x w x h

Question 19

surface area of cylinder

Answer 19

2πr2 + 2πrh

Question 20

volume of a cylinder

Answer 20

πr2h

Question 21

y axis

Answer 21

dependent variable

Question 22

x axis

Answer 22

independent variable

Question 23

volume of a sphere

Answer 23

4/3πr3

Question 24

straight line

Answer 24

y = mx + c

Question 25

gradient

Answer 25

change in y/change in x

Question 26

pH

Answer 26

pH= -log10[H+]

Question 26

logarithms

Answer 26

logarithms are powers to which a base is raised so log100=2 and log1000=3

Question 27

benefits of using ratio

Answer 27

allows comparison and starting amounts are different

Question 28

dilution series

Answer 28

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