Laboratory

pH <= 2

What should be the pH of a waste for it to be

considered as an acidic waste

ph => 12.5

What should be the pH of a waste for it to be

considered as an alkali waste?

waste generator

Refers to a person who produces hazardous

wastes, through any institutional, commercial,

industrial or trade activities

wastes with inorganic materials

Wastes containing mercury and arsenic

should be classified as _____

Rubber gloves

In handling acid wastes, what type of protective gloves should be used?

Polyethylene Drums

What type of container must be used for acid or alkali wastes

sodium bicarbonate

In case of acid spils, what can be applied to the spill before treating it with adsorbent material

Ignitability

Hazardous waste characteristic which applies to waste liquids with a flash point less than 140 F

Corrosivity

Hazardous waste characteristic which applies to aqueous solution with a pH less than or

equal to 2 or greater than or equal to 12.5

Reactivity

Hazardous waste characteristic which applies to materials that are normally unstable or explosive

Toxicity

Hazardous waste characteristic which applies to wastes that have the potential to contaminate groundwater if improperly disposed

Composting

Solid waste management practice which refers to the controlled decomposition of

organic matter by microorganisms, mainly

bacteria and fungi, into a humus-like product

Compostable wastes

Biodegradable wastes such as food waste, garden waste, animal waste and human waste that undergo biological degredation under controlled conditions

sharps

Waste materials refer to items designed to cut or puncture skin and sharp items with human blood and body fluids or bacteria

Persistent Organic Chemicals (POPs)

These are organic chemicals that are resistant to environmental degradation

through chemical, biological, and photolytic processes

Leachate

This refers to any liquid that passes through a landfill and has extracted dissolved and

suspended matter from it.

True

TRUE OR FALSE. Store concentrated acids and bases separately in enclosures made of corrosion-resistant materials.

False

TRUE OR FALSE. Keep fire extinguishers away from locations where chemicals are

stored or used.

Safety Data Sheet

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.

Respiratory Sensitizer

Type of chemical that can cause an allergic reaction in the airways following inhalation of the chemical.

a. acetic acid solution

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

compatibility with other chemicals

First consideration for chemical storage shall be based on its:

a. potassium dichromate

Which of the following is an oxidizing chemical?

a. potassium dichromate

b. sodium hydride

c. magnesium

d. sodium

Dessicator

Sealable enclosures containing desiccants used to protect chemicals which are hygroscopic or which react with water from humidity.

Pycnometer

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

Fume hood

Preparation of highly toxic and volatile compounds should be carried out in an efficient _____.

False

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

True

TRUE or FALSE. 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.

False

TRUE OR FALSE. 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.

False

TRUE OR FALSE. Karl Fischer titrator is used to determine viscosity of liquids

True

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

False

TRUE OR FALSE. Cuvettes must be cleaned in an ultrasonic cleaning bath

True

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

False

TRUE OR FALSE. 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

TRUE OR FALSE. Class B volumetric glass

ware provides the highest accuracy and

passes the ASTM standard specification for

laboratory volumetric glass ware.

False

TRUE OR FALSE. In calibration of burettes,

volume reading shall be taken with the eye higher than the liquid level to avoid parallax error

Hydrochloric Acid

Which of the following chemicals may be used to neutralize waste containing caustic soda?

a. Potassium Hydroxide

b. Ammonia

c. Hydrochloric Acid

d. Buffer 10 Solution

Chlorine

This chemical is usually used to disinfect waste containing microbial organisms.

Pictogram

Symbols indicated in waste labels that

instantly identify the kind of hazard the chemical possesses

Waste containing dichloromethane

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

A. Waste containing acetonitrile

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

200 ppm

What is the minimum concentration of cyanide contained in a waste to be classified it under A101 (wastes containing cyanide )?

D. All of the above

According to Revised DAO 04-36, the appropriate

waste labels shall include:

A. Volume of Waste

B. Generator ID Number

C. Container Material

D. All of the above

Calibration curve

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.

UV-Vis Spectrophotometer

Instrument that uses cuvette.

Buffer Solutions

A series of reference standards solutions that

have known and accurate pH values at different temperatures used for pH meter calibration.

Wavelength

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.

pH

It is the measure of hydrogen ion activity in aqueous solutions.

Beer-Lambert's Law

Law that states the linear relationship between absorbance and concentration of an

absorbing species

Matrix Spike

Type of quality-control sample used to evaluate the effects of sample matrices on the performance of an analytical method

Instrument Blank

A clean sample (e.g., distilled water) processed through the instrumental steps of

the measurement process to determine

instrument contamination.

Method Detection Limit

Minimum concentration of a substance that can be measured and reported with 99%

confidence that the analyte concentration is

greater than zero

Systematic Error

Component of error which, in the course of a

number of analyses of the same measurand,

remains constant or varies in a predictable

way.

Random Error

Component of error which arises from unpredictable variations of influence quantities.

Quality Control

Series of analytical measurements used to

assess the quality of the analytical data

Light

Part of the Atomic Absorption Spectrophotometer that Provides the analytical light line for the element of interest

Nebulizer

Part of AAS that Creates a fine aerosol for introduction into the flame

Flame

Part of AAS that Destroys any analyte ions and breakdown complexes to create atoms (the elemental form) of the element of interest.

Monochromator

Part of AAS that Separates and transmits a

narrow portion of the optical signal chosen

from a wider range of wavelengths available

at the input.

Detector

part of AAS that Determines the intensity of photons of the analytical line exiting the

monochromator.

Amber bottle container

Light sensitive samples should be collected in

a/an _____ container.

Dichloromethane

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.

Primary standard

It is a pure dry solid substance of known

chemical composition used in the direct

standardization of solution.

Filtration

The following are different types of sample

preservation except:

a. freezing

b. acidification

c. reagent addition

d. filtration

Accuracy

It is the closeness of the agreement between the result of a measured value and a true value.

a. Accuracy

b. Precision

c. Mean

d. Error

acid digestion

Sample preparation technique used prior to

instrumental analysis of metals.

a. acid digestion

b. liquid-liquid extraction

c. sieving

d. clean-up

method blank

Detects contamination from reagents, sample handling, and the entire

measurement process

hexane

Organic compounds in aqueous sample A will be

extracted using liquid-liquid extraction. Which of the following is the most appropriate solvent to use?

a. methanol

b. water

c. hexane

d. hydrochloric acid solution

pulverizing

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

sedimentation

Sample preparation in which the sample is

allowed to settle by leaving it undisturbed in a vessel.

Acidify with 1mL HNO3 to pH<2

Preservation technique for water samples intended for metals determination that cannot be analyzed immediately

Grab sample

This refers to a single sample or measurement taken at a specific time or over as short a period as feasible.

composite sample

A sample comprising two or more increments selected to represent the material being analyzed.

Temperature

Which of the following parameters shall be

analysed immediately after collection?

a. Density

b. Temperature

c. Viscosity

d. Solids

Coning and Quartering

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.

Ashing

Sample preparation that involves the process

of decomposition of organic matter