Lecture 1 - Introduction

Question 1

Deals with the identification and quantification of an analyte in a given sample

Answer 1

analytical chemistry

Question 2

substance or chemical constituent that is of interest in an analytical procedure

Answer 2

analyte

Question 3

seeks to establish/confirm the presene of a given element or compound in a sample

Answer 3

qualitative

Question 4

seeks to establish/confirm the amount of a given element or compound in a sample

Answer 4

quantitative

Question 5

mass of an analyte or some compound related to it determined
e.g. amount of water lost in a hydrate by heating the sample

Answer 5

gravimetric

Question 6

volume or mass of a solution which reacts completely with analyte is measured
e.g. acid-base titration and redox reactions

Answer 6

volumetric

Question 7

the answer should have the same number of decimal places as the term with the fewest decimal places

Answer 7

addition and substraction

Question 8

the answer should have the same number of significant figures as the term with the fewest significant figures

Answer 8

multiplication and division

Question 9

the answer should have the same number of significant figures as the term with the fewest significant figures

Answer 9

multiplication and division

Question 10

is the closeness of a measured value to the true or accepted value

Answer 10

accuracy

Question 11

describes the agreement among several results obtained in the same way

Answer 11

precision

Question 12

Absolute error calculation

Answer 12

measured value - true value

Question 13

Relative error calculation

Answer 13

(measured value - true value/true value) x 100

Question 14

Relates to reproducibility of results. A precise value need not to be accurate

Answer 14

Precision

Question 15

Calculations used for precision

Answer 15

• deviation from mean
• mean deviation