Gravimetric Analysis

Question 1

Determination of water amount in sample done through using a pre weighed absorbent trap.

Answer 1

Direct Analysis

Question 2

Encompasses all techniques in which we measure mass or a change in mass.

Answer 2

Gravimetry

Question 3

Commonly referred to as filter paper, range in pore size from 30µm to 2–3µm.

Answer 3

Cellulose Fiber Filters

Question 4

Constructed from chemically inert borosilicate glass, range in pore size from 2.5 µm to 0.3 µm.

Answer 4

Glass Fiber Filters

Question 5

Are made from a variety of materials, including cellulose nitrate and PTFE, are available with pore sizes from 5.0 µm to 0.1 µm.

Answer 5

Membrane Fiber Filters

Question 6

Determination of water amount in sample done through using a pre weighed absorbent trap

Answer 6

Direct Analysis /Determination

Question 7

An easier approach is to weigh the sample of food before and after heating, using the change in its mass as an indication of the amount of water originally present.

Answer 7

Indirect Analysis / Determination

Question 8

A gravimetric method in which the signal is the mass of a precipitate. (analyzing ores)

Answer 8

Precipitation Gravimetry

Question 9

Insoluble solid from liquid solution in gravimetry

Answer 9

Precipitate

Question 10

A gravimetric method in which the signal is the mass of an electrode deposit on the cathode or anode in an electrochemical cell

Answer 10

Electrogravimetry

Question 11

A process that assembles solid materials from molecules, ions or complexes in a solution.

Answer 11

Electrodeposition

Question 12

A gravimetric method in which the loss of a volatile species gives rise to the signal.

Answer 12

Volatilization Gravimetry

Question 13

A form of volatilization gravimetry in which the change in a sample’s mass
is monitored while it is heated.

Answer 13

Thermogravimetry

Question 14

A gravimetric method in which the mass of a
particulate analyte is determined following its separation from its matrix.

Answer 14

Particulate Gravimetry

Question 15

Are form of minute separate particles examples nitrates, sulfates and organic chemicals

Answer 15

Particulate

Question 16

To achieve an accuracy of ±0.1% using an analytical balance with a sensitivity of ±0.1 mg, the precipitate must weigh at least 100 mg.

Answer 16

Scale of Operation

Question 17

Non-optically active member of a set of stereoisomers

Answer 17

Meso - compound

Question 18

Relative errors of 0.1–0.2% are routinely achieved.

Answer 18

Macro-major samples

Question 19

It determine the components of an unknown material, to confirm the identity of a suspect material and to identify differences between similar materials.

Answer 19

Compositional Analysis

Question 20

• The main purpose are for identifying, quantifying and purifying the individual components of the mixture.
• It is a liquid chromatography used to separate compounds that are dissolved in solutions

Answer 20

High Pressure Liquid Chromatography

Question 21

• An analytical technique used to separate and detect the chemical components of a
sample mixture to determine their presence or absence and/or quantities.
• These chemical components are usually organic molecules or gases

Answer 21

Gas Chromatography

Question 22

A process where a sample of some material (e.g., soil, waste or drinking water, bodily fluids, minerals, chemical
compounds) is analyzed for its
elemental and sometimes isotopic composition.

Answer 22

Elemental Analysis

Question 23

• Instrument designed to measure various substances and other characteristics in a number of biological samples quickly, with minimal human assistance.
• These measured properties of blood and other fluids may be useful in the diagnosis of disease.

Answer 23

Automated Analysis

Question 24

• A medical laboratory equipment used extensively in clinical laboratories.
• It is designed to conduct tests to measure chemicals at various stages of the biological processes on a wide range of test samples from blood, plasma, serum, and cerebrospinal fluid to urine.

Answer 24

Biochemistry analyzers

Question 25

• Antibodies are used by some analyzers to detect many substances by immunoassay and other reactions that employ the use of antibody-antigen reactions.
• Recent developments include automation for the immunohematology lab, also known as transfusion medicine.

Answer 25

Immuno-based analyzers

Question 26

______ in clinical laboratory is used
not only to assist the laboratory’s test performance but also to process and transport the specimens, to load the specimens into automated analyzers, to assess the test results obtained, and to store and archive the specimens, which means the automation involves all important processes in laboratory.

Answer 26

Automation

Question 27

A way to seperate soluble solids by characteristics and property of their solubility in a given appropriate solvent.

Answer 27

Fractional Crystallization

Question 28

Term used for chemicals which are considered helper molecules assisting in biochemical reactions

Answer 28

Co - Factor

Question 29

A chemical used as a purgative or laxatives

Answer 29

Mercurous Chloride

Question 30

A trivalent inorganic anion obtained by removal of protons in phosphorous acid.

Answer 30

Phosphate

Question 31

(TRUE OR FALSE) : Mass a signal is measured in a balance.

Answer 31

True

Question 32

(TRUE OR FALSE) : Silver Chloride has disinfectant and antiseptic properties

Answer 32

True

Question 33

(TRUE OR FALSE) : Antibodies are used by some analyzers to detect many substances by immunoassay

Answer 33

True

Question 34

(TRUE OR FALSE) : Mass is a measure of how much object contains

Answer 34

True

Question 35

(TRUE OR FALSE) : The macro - major samples, relative error limit are within 0.1- 0.5% in gravimetric analysis

Answer 35

False (0.1- 0.2%)