Chemical Technician
Sieving - ANS-Method of passing the sample through a metal or plastic mesh of a uniform
cross-sectional area to separate particles into uniform sizes.
Freeze dryer - ANS-It can remove a fairly large amount of water from a sample that contains
thermally labile material.
Acid digestion - ANS-Sample preparation technique used prior to instrumental analysis of
metals.
Fusion technique - ANS-In the decomposition and dissolution of solids during sample
preparation, it is expensive and often the last resort.
High signal-to-noise ratio - ANS-Analytical methods or instruments' performance aim for
Matrix - ANS-It accounts for all the other components in the mixture that are not under
investigation
Primary standard - ANS-When qualifying a working standard, what is the best type of reagent to
use?
Polyethylene - ANS-What type of container should be used when handling or storing hydrogen
fluoride?
calcium gluconate - ANS-Which of the following is a treatment for HF burns?
Amber bottle - ANS-Which of the following is the most appropriate container for hexane?
Foam type - ANS-If a fire extinguisher has a red body and a blue band, what is its content?
Red - ANS-According to NFPA, what color refers to flammability.
Face velocity - ANS-a value that determines the suitability of the chemical fume hood for its use
(should be 80 to 100 feet per minute
Safety Date Sheet (SDS) - ANS-A technical document, which is GHS compliant, that contains all
the information related to the health hazard, storage, precautionary measures, emergency
procedures, etc. when handling chemicals.
Calibration curve - ANS-A graphical representation of measuring signal as a function of quantity
of analyte.
,Quality Manual - ANS-It describes the policies and procedures the laboratory has to manage in
relation to quality, or references where those procedures can be found. An essential
requirement of ISO 9000 series of standards and ISO 17025.
Capacity - ANS-It is the nominal volume of water ( or mercury) contained, or delivered by an
article of volumetric glassware, at its reference temperature.
Pycnometer - ANS-Used to determine the density of a liquid.
Venting - ANS-This is done during liquid-liquid extraction to release the pressure build-up inside
the separatory funnel during shaking.
Drying agent - ANS-This is used to remove trace amounts of water in organic solutions. This
can be added to the pooled organic layers before removal of the organic solvent
Short stem funnel - ANS-Used to filter hot mother liquor during recrystallization.
Temperature - ANS-In crystallization, crystal phases can be interconverted by varying...
Inside the distilling flask and it should be just below the side arm of the flask - ANS-Where
should a thermometer be placed to determine the boiling point of the distillate?
Steam distillation - ANS-An organic compound decomposes at its boiling point. What is the most
appropriate method for the recovery of the solid organic compound?
Fractionating column - ANS-It allows for many successive distillations to take place at once. It
contains indentations or a packing material with lots of surface area.
Equal to external pressure - ANS-The boiling point of a liquid is the temperature at which the
vapor pressure is
Azeotrope - ANS-A liquid mixture that has a constant boiling point and whose vapor has the
same composition as the liquid.
Multiple extraction using three 50-mL portions of ether - ANS-A 5-g organic solid is dissolved in
100 mL of distilled water. What is the best way to recover most of the organic solid?
Place the reaction mixture in a dry ice-acetone mixture - ANS-A reaction mixture needs to be
cooled to -77C after refluxing. What is the best method to be used?
Helium, Argon, Nitrogen - ANS-Common carrier gases from gas chromatography
ECD - ANS-An air sample is subjected to gas chromatography for the analysis of Freon-11
(CCl3F). The detector that is most suitable for this analysis is
, Reversed-phase chromatography - ANS-A non polar stationary phase and polar mobile phase
Acetamide, acetone, dichloroethane - ANS-Correct order of elution (first to last) from an HPLC
column containing a reversed-phase packing
The column has (+) resin where (-) species bind. - ANS-In anion-exchange chromatography,
Source, monochromator, sample, detector - ANS-Correct order in which light passes through a
UV-Vis spectrometer
Tungsten - ANS-Light source should be used in the wavelength range if 340-1000 nm
To allow only light of a certain wavelength to pass from the source to the sample - ANS-Purpose
of monochromator
The relationship between absorbance and concentration is not linear at high concentration -
ANS-Why must solutions with high concentrations be diluted prior to analysis via Beer's law?
Flame - ANS-Widely used continuous atomization method in AAS. It is also the most
reproducible of all liquid-sample introduction methods that have been developed for AAS to
date.
The width of an atom's absorption band is narrow - ANS-A hollow cathode tube lamp is
necessary in AAS because
m/z ratio - ANS-A mass spectrum plots the intensity of each ion versus its
MALDI - ANS-A soft ionization method in mass spectrometry that is typically applied to
biomolecules that involves a laser striking a solid matrix to ionize that analyte without
fragmentation or decomposition
O-H bond, N-H bond, C-H bond - ANS-The peaks of these bonds can be found at ≥3000 cm-1 in
an IR spectrum
Purity - ANS-It is the fraction of the named material present in the stated chemical form.
Limit of detection - ANS-It is a performance parameter that could be used to analyze blank
sample matrix
Technical grade - ANS-Chemical grade commonly used for low-grade applications such as
cleaning and qualitative testing
Sieving - ANS-Method of passing the sample through a metal or plastic mesh of a uniform
cross-sectional area to separate particles into uniform sizes.
Freeze dryer - ANS-It can remove a fairly large amount of water from a sample that contains
thermally labile material.
Acid digestion - ANS-Sample preparation technique used prior to instrumental analysis of
metals.
Fusion technique - ANS-In the decomposition and dissolution of solids during sample
preparation, it is expensive and often the last resort.
High signal-to-noise ratio - ANS-Analytical methods or instruments' performance aim for
Matrix - ANS-It accounts for all the other components in the mixture that are not under
investigation
Primary standard - ANS-When qualifying a working standard, what is the best type of reagent to
use?
Polyethylene - ANS-What type of container should be used when handling or storing hydrogen
fluoride?
calcium gluconate - ANS-Which of the following is a treatment for HF burns?
Amber bottle - ANS-Which of the following is the most appropriate container for hexane?
Foam type - ANS-If a fire extinguisher has a red body and a blue band, what is its content?
Red - ANS-According to NFPA, what color refers to flammability.
Face velocity - ANS-a value that determines the suitability of the chemical fume hood for its use
(should be 80 to 100 feet per minute
Safety Date Sheet (SDS) - ANS-A technical document, which is GHS compliant, that contains all
the information related to the health hazard, storage, precautionary measures, emergency
procedures, etc. when handling chemicals.
Calibration curve - ANS-A graphical representation of measuring signal as a function of quantity
of analyte.
,Quality Manual - ANS-It describes the policies and procedures the laboratory has to manage in
relation to quality, or references where those procedures can be found. An essential
requirement of ISO 9000 series of standards and ISO 17025.
Capacity - ANS-It is the nominal volume of water ( or mercury) contained, or delivered by an
article of volumetric glassware, at its reference temperature.
Pycnometer - ANS-Used to determine the density of a liquid.
Venting - ANS-This is done during liquid-liquid extraction to release the pressure build-up inside
the separatory funnel during shaking.
Drying agent - ANS-This is used to remove trace amounts of water in organic solutions. This
can be added to the pooled organic layers before removal of the organic solvent
Short stem funnel - ANS-Used to filter hot mother liquor during recrystallization.
Temperature - ANS-In crystallization, crystal phases can be interconverted by varying...
Inside the distilling flask and it should be just below the side arm of the flask - ANS-Where
should a thermometer be placed to determine the boiling point of the distillate?
Steam distillation - ANS-An organic compound decomposes at its boiling point. What is the most
appropriate method for the recovery of the solid organic compound?
Fractionating column - ANS-It allows for many successive distillations to take place at once. It
contains indentations or a packing material with lots of surface area.
Equal to external pressure - ANS-The boiling point of a liquid is the temperature at which the
vapor pressure is
Azeotrope - ANS-A liquid mixture that has a constant boiling point and whose vapor has the
same composition as the liquid.
Multiple extraction using three 50-mL portions of ether - ANS-A 5-g organic solid is dissolved in
100 mL of distilled water. What is the best way to recover most of the organic solid?
Place the reaction mixture in a dry ice-acetone mixture - ANS-A reaction mixture needs to be
cooled to -77C after refluxing. What is the best method to be used?
Helium, Argon, Nitrogen - ANS-Common carrier gases from gas chromatography
ECD - ANS-An air sample is subjected to gas chromatography for the analysis of Freon-11
(CCl3F). The detector that is most suitable for this analysis is
, Reversed-phase chromatography - ANS-A non polar stationary phase and polar mobile phase
Acetamide, acetone, dichloroethane - ANS-Correct order of elution (first to last) from an HPLC
column containing a reversed-phase packing
The column has (+) resin where (-) species bind. - ANS-In anion-exchange chromatography,
Source, monochromator, sample, detector - ANS-Correct order in which light passes through a
UV-Vis spectrometer
Tungsten - ANS-Light source should be used in the wavelength range if 340-1000 nm
To allow only light of a certain wavelength to pass from the source to the sample - ANS-Purpose
of monochromator
The relationship between absorbance and concentration is not linear at high concentration -
ANS-Why must solutions with high concentrations be diluted prior to analysis via Beer's law?
Flame - ANS-Widely used continuous atomization method in AAS. It is also the most
reproducible of all liquid-sample introduction methods that have been developed for AAS to
date.
The width of an atom's absorption band is narrow - ANS-A hollow cathode tube lamp is
necessary in AAS because
m/z ratio - ANS-A mass spectrum plots the intensity of each ion versus its
MALDI - ANS-A soft ionization method in mass spectrometry that is typically applied to
biomolecules that involves a laser striking a solid matrix to ionize that analyte without
fragmentation or decomposition
O-H bond, N-H bond, C-H bond - ANS-The peaks of these bonds can be found at ≥3000 cm-1 in
an IR spectrum
Purity - ANS-It is the fraction of the named material present in the stated chemical form.
Limit of detection - ANS-It is a performance parameter that could be used to analyze blank
sample matrix
Technical grade - ANS-Chemical grade commonly used for low-grade applications such as
cleaning and qualitative testing
