5.4

Question 1

what is an error

Answer 1

something that even skilled operators struggle to avoid
the difference between an experimental value and the correct value

Question 2

what is a mistake (give examples)

Answer 2

something that a skilled operator can avoid by being careful
(reading burette wrong, recording incorrect values, not setting balance to zero)

Question 3

define random error

Answer 3

error caused by unpredictable changes in conditions such as temperature or pressure

Question 4

define systematic error

Answer 4

an error caused by the apparatus and leads to values given by apparatus being faulty

Question 5

what is measurement uncertainty

Answer 5

the potential error involved when using a piece of apparatus to make a measurement

Question 6

give some examples of random and systematic errors

Answer 6

random: changes in temp + pressure
condensation on balance
systematic: wrongly calibrated in manufacturing

Question 7

what is the equation for percentage uncertainty

Answer 7

uncertainty x 100/ measurement taken

Question 8

what is the capacity and uncertainty for a burette

Answer 8

50cm^3 _+ 0.05cm^3

Question 9

what is the capacity and uncertainty for a pipette

Answer 9

25cm^3 _+ 0.06cm^3

Question 10

what is the capacity and uncertainty for a volumetric flask

Answer 10

250cm^3 _+ 0.3cm^3