Terms

Question 1

measure response of the analytical procedure to impurities or interfering species in the re

Answer 1

blanks

Question 2

arise from color of starting reagent, reaction of impurities, & reactions of interfering species

Answer 2

absorbance

Question 3

shows response of an analytical method to known quantities of analyte

Answer 3

calibration curve

Question 4

contains unknown [analyte]

Answer 4

standard solution

Question 5

contains all reagents and solvents used in the analysis, but no added analyte.

Answer 5

blank solution

Question 6

[analyte] range over which response is proportional to the
concentration

Answer 6

linear range

Question 7

concentration range over which there is a measurable response to analyte.

Answer 7

dynamic range

Question 8

smallest quantity of analyte that is ‘statistically’ different from the blank

Answer 8

detection limit

Question 9

equals .051au

Answer 9

ppm

Question 10

measuring length with a ruler

Answer 10

direct measurement

Question 11

when we calibrate an instrument and then measure the sample

Answer 11

indirect measurement

Question 12

a mistake, may be able to remove from consideration via statistical analysis.

Answer 12

gross error

Question 13

a permanent deviation from the true result. the method is flawed or instrumental bias. always gets the wrong result mostly always the instrument.

Answer 13

systematic error

Question 14

repeating experiments gives a slightly different answer inability for scientists to recreate the exact environment

Answer 14

random error

Question 15

getting the right answer with acceptable uncertainty

Answer 15

accuracy

Question 16

getting the same answer each time you take the measurement

Answer 16

precision

Question 17

also known as the coefficient of variation, a measurement expressed as a fraction or a %age

Answer 17

relative standard
deviation

Question 18

defined to express the confidence as the mean draws closer to ¼. becomes smaller as the number of data increases

Answer 18

standard deviation of the mean

Question 19

estimate of the range within which the true value might fall within a given probability

Answer 19

Confidence interval

Question 20

the limits of the confidence interval

Answer 20

confidence limit

Question 21

evaluates the differences between the spread based on their s.d. - defined in terms of the variances in data

Answer 21

f test

Question 22

evaluates statistical differences between the results - whether or not they measure the same thing.

Answer 22

T-test

Question 23

used to obtain an improved estimate of the precision of a method and calculate the precision of the two sets of data
in a paired t test

Answer 23

pooled standard deviation

Question 24

accurately weighed quantity of highly pure material.

Answer 24

primary standard

Question 25

if the material is not sufficiently pure, a solution is prepared
to give approximately the desired concentration by titrating
a weighed quantity of a primary standard

Answer 25

secondary stanwatdard