OTHERS Flashcards by Vince Rafael Candelaria

It is a document that provides useful information on the chemical hazards, advice on safe
handling, use and storage, and the emergency measures to be followed in case of an
accident. It usually contains 16 headings.
a. Certificate of Analysis
b. Product Specification
c. Safety Data Sheet
d. Environmental Compliance Certificate

c. Safety Data Sheet

How well did you know this?

Not at all

Perfectly

The following will cause drift errors in an analytical balance except:
a. Balance door is open.
b. Balance is not levelled.
c. Air currents are present in the laboratory.
d. Temperature of the balance and the sample to be weighed is the same

d. Temperature of the balance and the sample to be weighed is the same

How well did you know this?

Not at all

Perfectly

Type of chemical that can cause an allergic reaction in the airways following inhalation of
the chemical.
a. Oxidizer
b. Corrosive
c. Carcinogen
d. Respiratory Sensitizer

d. Respiratory Sensitizer

How well did you know this?

Not at all

Perfectly

Ammonia solution can be stored with the following chemicals except for:
a. acetic acid solution
b. sodium hydroxide solution
c. 2-propanol solution
d. cyclohexane solution

How well did you know this?

Not at all

Perfectly

First consideration for chemical storage shall be based on its:
a. frequency of usage
b. compatibility with other chemicals
c. size of the container
d. alphabetical order

b. compatibility with other chemicals

How well did you know this?

Not at all

Perfectly

Which of the following does not require a minimum of annual third party calibration?
a. analytical balance
b. drying oven
c. autoclave
d. sets of weights

d. sets of weights

How well did you know this?

Not at all

Perfectly

Which of the following is an oxidizing chemical?
a. potassium dichromate
b. sodium hydride
c. magnesium
d. sodium

a. potassium dichromate

How well did you know this?

Not at all

Perfectly

In starting-up laboratory operations the following should be observed except ________.
a. Turning on the hoods, vents and exhaust fans.
b. Turning the equipment and instruments on.
c. Performing the analysis immediately.
d. Monitoring operating parameters.

c. Performing the analysis immediately.

How well did you know this?

Not at all

Perfectly

The following must be avoided in using the analytical balance except ______________.
a. Weighing warm objects in the balance.
b. Closing the draft shield before reading the result.
c. Placing the sample not at the center but on the side of the pan.
d. Touching the samples or sample containers with your bare fingers.

b. Closing the draft shield before reading the result.

How well did you know this?

Not at all

Perfectly

Sealable enclosures containing desiccants used to protect chemicals which
are hygroscopic or which react with water from humidity.
a. Mortar and Pestle
b. Desiccator
c. Evaporating dish
d. Separatory Funnel

b. Desiccator

How well did you know this?

Not at all

Perfectly

To determine the specific gravity of a liquid, which of the following glass wares should be
used?
a. volumetric flask
b. pycnometer
c. pipette
d. graduated cylinder

b. pycnometer

How well did you know this?

Not at all

Perfectly

Preparation of highly toxic and volatile compounds should be carried out in an efficient
_____________.
a. canopy hood
b. laminar hood
c. fume hood
d. any of the above

c. fume hood

How well did you know this?

Not at all

Perfectly

Which of the following shall not be followed when boiling a solution in a hot plate?
a. Make sure that the glass ware being used is heat resistant
b. Inspect the glass ware for cracks before putting it in the hot plate.
c. Add boiling stones to facilitate boiling.
d. When removing the heated material, use polyethylene gloves to protect your hand from
heat.

d. When removing the heated material, use polyethylene gloves to protect your hand from
heat.

How well did you know this?

Not at all

Perfectly

The alkaline effect is the phenomenon where H+ ions in the gel layer of the pH-sensitive
membrane are partly or completely replaced by alkali ions.

True

How well did you know this?

Not at all

Perfectly

Karl Fischer titrator is used to determine viscosity of liquids.

False

While Karl Fischer titrators are important instruments used in analytical chemistry, their primary function is not to measure viscosity. They are specifically designed for determining the moisture content of liquids and solids.

How well did you know this?

Not at all

Perfectly

The conductivity value of a liquid solution increases as the temperature decreases as a
result of higher ion mobility

False

How well did you know this?

Not at all

Perfectly

In pH measurements, if the solution is acidic, the H+ ions diffuse out of the layer and a
negative charge is established on the outer side of the membrane

True

How well did you know this?

Not at all

Perfectly

For pipettes marked with To Deliver (TD), a small amount of liquid remaining on the tip
should not be blown out.

True

How well did you know this?

Not at all

Perfectly

Cuvettes must be cleaned in an ultrasonic cleaning bath

False

How well did you know this?

Not at all

Perfectly

In operating the centrifuge, opposing tubes must be of equal weight.

True

How well did you know this?

Not at all

Perfectly

Class B volumetric glass ware provides the highest accuracy and passes the ASTM
standard specification for laboratory volumetric glass ware.

False

Class A

How well did you know this?

Not at all

Perfectly

To ensure that glass wares is properly cleaned, the film of water which adheres to the
inner glass wall of the glass ware as it is emptied must not be uniform.

False

How well did you know this?

Not at all

Perfectly

In recording laboratory results, the following shall be done, except:
a. Use permanent ink
b. When an error is committed, put multiple lines to cross out the wrong data
c. Always indicate the date of analysis
d. Record all necessary details including qualitative observations

b. When an error is committed, put multiple li

How well did you know this?

Not at all

Perfectly

In sample acceptance, which of the following shall be checked?
a. sample density
b. sample integrity
c. amount of sample
d. both b and c

d. both b and c

How well did you know this?

Not at all

Perfectly

In determination of chlorides using argentometric titration, what indicator shall be used? a. phenolphthalein b. ferroin c. methyl red d. potassium chromate

d. potassium chromate

Method that involves mechanical cutting of sample into smaller parts a. sieving b. chopping c. crushing d. blending

b. chopping

This refers to a single sample or measurement taken at a specific time or over as short a period as feasible. a. grab sample b. composite sample c. laboratory sample d. none of the above

a. grab sample

A sample comprising two or more increments selected to represent the material being analyzed. a. grab sample b. composite sample c. laboratory sample d. none of the above

b. composite sample

Which of the following parameters shall be analysed immediately after collection? a. Density b. Temperature c. Viscosity d. Solids

b. Temperature

Method by which the sample is processed to be uniform in texture and consistency by breaking down into smaller parts and blending a. grinding b. mincing c. homogenizing d. pressing

c. homogenizing

Type of subsampling in which the sample is mixed to form a pile and then spread out to a flattened disk. The disk is then divided into 4 parts and one of the opposite pair is used as the laboratory sample. a. coning and quartering b. grab sampling c. splitters d. rotational traversing cut

a. coning and quartering

What should be the pH of a waste for it to be considered as an “acidic waste”? a. pH <= 2 b. pH <= 3 c. pH 4 d. pH 7

a. pH <= 2

Sample preparation that involves the process of decomposition of organic matter a. ashing b. homogenization c. fusion reaction d. liquid extraction

a. ashing

What should be the pH of a waste for it to be considered as an “alkali waste”? a. pH 7 b. pH > 2 c. pH 10 d. pH > 12.5

d. pH > 12.5

This refers to a person who produces hazardous wastes, through any institutional, commercial, industrial or trade activities. a. Waste generator b. Waste treater c. Waste transporter d. Pollution Control Officer

a. Waste generator

In cases of acid spills, which of the following can be applied to the spill before treating it with adsorbent material? a. Sodium bicarbonate b. Water c. Acetic acid d. Sodium bisulfite

a. Sodium bicarbonate

Wastes containing mercury and arsenic should be classified as what type of waste? a. Alkali waste b. Wastes with inorganic chemicals c. Reactive chemical wastes d. Stabilized Waste

b. Wastes with inorganic chemicals

It is a hazardous waste characteristic which applies to waste liquids with a flash point less than 140°F or solids capable of spontaneous combustion under normal temperature and pressure. a. Ignitability b. Reactivity c. Corrosivity d. Toxicity

a. Ignitability

It is a hazardous waste characteristic which applies to aqueous solutions with a pH less than or equal to 2 or greater than or equal to 12.5. a. Ignitability b. Reactivity c. Corrosivity d. Toxicity

c. Corrosivity

It is a hazardous waste characteristic which applies to materials that are normally unstable or explosive. They can cause explosions, toxic fumes, gases or vapours when mixed with water. a. Ignitability b. Reactivity c. Corrosivity d. Toxicity

b. Reactivity

It is a hazardous waste characteristic which applies to wastes that have the potential to contaminate groundwater if improperly disposed of. These materials are regulated as hazardous waste due to their potential to leach out specific toxic substances in a landfill. a. Ignitability b. Reactivity c. Corrosivity d. Toxicity

d. Toxicity

These are biodegradable wastes such as food waste, garden waste, animal waste and human waste that can undergo biological degradation under controlled conditions and can be turned into compost. a. Recyclable wastes b. Residual wastes c. Compostable wastes d. Special wastes

c. Compostable wastes

These are any waste materials that can be retrieved from the waste stream and free from contamination that can still be converted into suitable beneficial use. a. Recyclable wastes b. Residual wastes c. Compostable wastes d. Special wastes

a. Recyclable wastes

These waste materials refer to items designed to cut or puncture skin and sharp items with human blood and body fluids or bacteria. a. Hazardous glass and plastics b. Non-hazardous trash c. Waste or surplus chemicals d. Sharps

d. Sharps

These are organic chemicals that are resistant to environmental degradation through chemical, biological, and photolytic processes. a. Persistent Organic Chemicals (POPs) b. Ozones c. Carcinogen d. Mutagen

a. Persistent Organic Chemicals (POPs)

This refers to any liquid that passes through a landfill and has extracted dissolved and suspended matter from it. a. Filtrate b. Aquifers c. Leachate d. Groundwater

c. Leachate

Wastes containing live microorganisms can be treated by autoclaving or chemical disinfection

true

It is a general term denoting any wastewater, partially or completely treated, or in its natural state, flowing out of a manufacturing, industrial or treatment plant. a. Influent b. Effluent c. Coastal water d. Fresh water

b. Effluent

Which of the following is not an ideal place to install the analytical balance? a. Stable and away from vibrations. b. Away from drafts caused by air conditioner. c. Away from direct sunlight. d. None of the above.

d. None of the above.

It is a general method for determining the concentration of a substance in an unknown sample by comparing the unknown to a set of standard samples of known concentration. a. Calibration curve b. Method validation c. Titration d. Chromatography

a. Calibration curve

Which of the following instruments uses a cuvette? a. Flame- AAS b. UV-Vis Spectrophotometer c. Gas Chromotograph d. pH Meter.

b. UV-Vis Spectrophotometer

A property of a wave which is described as the distance between a point on one wave and the same point on the next wave. a. frequency b. wavelength c. amplitude d. period

b. wavelength

Which of the following should not be done in using a cuvette? a. Use a brush to clean the insides of the cuvette b. Fill the cuvette about 3/4 full of the solution you wish to test. c. Wipe the outside of the cuvette with a lint-free, soft tissue to remove any moisture or fingerprints from the outside surface. d. Do not clean your cuvettes in an ultrasonic cleaning bath.

a. Use a brush to clean the insides of the cuvette

A clean sample (e.g., distilled water) processed through the instrumental steps of the measurement process to determine instrument contamination. a. Method Blank b. Instrument Blank c. Surrogate d. Reagent Blank

b. Instrument Blank

Component of error which, in the course of a number of analyses of the same measurand, remains constant or varies in a predictable way. a. Random Error b. Analyst’s Error c. Systematic Error d. Uncertainty

c. Systematic Error

. Component of error which arises from unpredictable variations of influence quantities. a. Random Error b. Analyst’s Error c. Systematic Error d. Uncertainty

a. Random Error

Series of analytical measurements used to assess the quality of the analytical data a. Quality Assurance b. Quality Control c. Analytical run d. Fortification

b. Quality Control

Atomic Absorption Spectrophotometer Separates and transmits a narrow portion of the optical signal chosen from a wider range of wavelengths available at the input. a. Light b. Nebulizer c. Flame d. Monochromator

d. Monochromator

Atomic Absorption Spectrophotometer Destroys any analyte ions and breakdown complexes to create atoms (the elemental form) of the element of interest. a. Light b. Flame c. Monochromator d. Detector

b. Flame

Atomic Absorption Spectrophotometer Creates a fine aerosol for introduction into the flame. a. Nebulizer b. Detector c. Monochromator d. Light

a. Nebulizer

Atomic Absorption Spectrophotometer Provides the analytical light line for the element of interest a. Light b. Flame c. Detector d. Nebulizer

a. Light

Atomic Absorption Spectrophotometer Determines the intensity of photons of the analytical line exiting the monochromator. a. Monochromator b. Detector c. Light d. Flame

b. Detector

precise dilutions and preparations of standard solutions a. Graduated cylinder b. Desiccator c. Volumetric flask d. Beaker

c. Volumetric flask

mixing, stirring, and heating liquids a. Volumetric flask b. Beaker c. Pipette d. Desiccator

b. Beaker

Light sensitive samples should be collected in a/an __________ container. a. polyethylene bottle container b. polypropylene container c. amber bottle container d. volumetric flask

c. amber bottle container

A solution consisting of petroleum ether, n-hexane and ethyl acetate is subjected to fractional distillation. What compound will be recovered first given the following boiling points? Dichloromethane = 39.6°C, n-hexane = 68°C, Xylene = 140°C. a. Dichloromethane b. n-hexane c. Xylene d. All the above

a. Dichloromethane

The dilution of concentrated acid is an exothermic process. It is best to: a. place the flask in a hot water bath. b. add ice cold water instead of room temperature water. c. place the flask in a cold water bath. d. place the flask in a freezer with a temperature of -20ºC

c. place the flask in a cold water bath.

Choose the formula to be used when you have to prepare a 0.3 N solution of NaOH form 5 N NaOH. a. N1V1=N2V2 b. PV=nRT c. M=moles/L a. P1V1=P2V2

a. N1V1=N2V2

Which of the following is a cause of contamination during the sample preparation? a. Sample contained in a required container following the precautions specified in the sampling method. b. Sample preparation apparatus is cleaned and washed according to requirements of sampling method. c. Carryover of previous sample due to uncleaned sample preparation apparatus. d. None of the above.

c. Carryover of previous sample due to uncleaned sample preparation apparatus.

Which of the following is not a sample size reduction technique for solid samples? a. grinding b. blending c. crushing d. stirring

d. stirring

Detects contamination from reagents, sample handling, and the entire measurement process a. method blank b. solvent blank c. calibration blank d. matched-matrix blank

a. method blank

Sample preparation method in which electromechanically driven rod or vibrating base is used to break particles down mechanically into smaller units; can be performed in wet or dry state a. sieving b. mincing c. homogenizing d. pulverizing

d. pulverizing

Preservation technique for water samples intended for metals determination that cannot be analyzed immediately a. Acidify with 1mL HNO3 to pH<2 b. Adjust pH to>11.5 with NaOH, c. Filter and preserve with zinc acetate d. add PbCO3

a. Acidify with 1mL HNO3 to pH<2

This chemical is usually used to disinfect waste containing microbial organisms. a. chlorine b. sodium chloride c. sodium sulfate d. fluorine

a. chlorine

Symbols indicated in waste labels that instantly identify the kind of hazard the chemical possesses A. Signal Words B. Pictogram C. Precautionary Statements D. Hazard Statement

B. Pictogram

Which of the following waste is classified as halogenated waste? A. Waste containing toluene B. Waste containing dichloromethane C. Waste containing acetone D. Waste containing ammonia

B. Waste containing dichloromethane

Which of the following waste is classified as non-halogenated waste? A. Waste containing acetonitrile B. Waste containing chloroform C. Waste containing polychlorinated hydrocarbons D. Waste containing bromine

A. Waste containing acetonitrile

Which of the following waste is not classified as inorganic waste? A. Waste containing mercury B. Waste containing lead C. Waste containing arsenic D. Waste containing acetonitrile

D. Waste containing acetonitrile

What is the minimum concentration of cyanide contained in a waste to be classified it under A101( wastes containing cyanide )? A. 20 ppm B. 100 ppm C. 200 ppm D. 1000 ppm

C. 200 ppm

Unidentified chemical waste can be disposed together with the other unidentified chemical waste. a. True b. False

b. False

Nitrates and potassium dichromate are considered as waste oxidizers. a. True b. False

a. True

Solutions containing high concentrations of ammonia are considered as corrosive waste. a. True b. False

a. True

Containers previously containing laboratory reagents are not considered as hazardous waste. a. True b. False

b. False

Waste containing pyridine is classified as non-halogenated waste. a. True b. False

a. True

Wastes can be stored in fume hoods or near the sink. a. True b. False

b. False

Store hazardous chemicals above eye level. a. True b. False

b. False

Liquids must be stored with secondary containment bins. a. True b. False

a. True