MIDTERM 02 - Physical Methods of Chemical Analysis

Question 1

An analysis that involves the determination of the chemical composition of a sample

Answer 1

Qualitative analysis

Question 2

A type of analysis that involves the quantification of a sample

Answer 2

Quantitative analysis

Question 3

3 types of errors

Answer 3

Random, Systematic, Gross

Question 4

Is a member of the class of compounds called alkaloids

Answer 4

Caffeine

Question 5

Are nitrogen-containing basic compounds that are found in plants

Answer 5

Alkaloids

Question 6

A substance that stimulates the heart, respiration, the CNS, and is a diuretic

Answer 6

Stimulant

Question 7

A sister molecule of caffeine which is found in the cacao bean

Answer 7

Theobromine

Question 8

Is the physical process by which a compound is transferred from one phase to another

Answer 8

Extraction

Question 9

The components are being transferred from a solid phase into a liquid phase

Answer 9

Solid-liquid extraction

Question 10

Involves the use of an organic solvent to extract the organic compounds to allow the isolation of single components from a mixture

Answer 10

Liquid-liquid extraction

Question 11

The physical process that rules liquid-liquid extraction

Answer 11

Solvent-solvent partitioning

Question 12

The water layer along with its components

Answer 12

Aqueous phase

Question 13

The organic layer along with its components

Answer 13

Organic phase

Question 14

The tendency of a solute to dissolve preferentially in solvent over another

Answer 14

Partition/distribution coefficient (Kd)

Question 15

Measures the efficiency of the extraction

Answer 15

Percentage recovery

Question 16

Is the transition of a solid into a gas without passing through the intermediary liquid stage

Answer 16

Sublimation

Question 17

Is the temperature at which a solid is changed into a liquid

Answer 17

Melting point

Question 18

Is a white crystalline powder and is the simplest of the aromatic carboxylic acids

Answer 18

Benzoic acid