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Chem Tech Review > Laboratory > Flashcards

Laboratory Flashcards

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1
Q

What should be the pH of a waste for it to be considered as an acidic waste

A

pH<= 2

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2
Q

What should be the pH of a waste for it to be considered as an alkali waste?

A

ph=> 12.5

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3
Q

Refers to a person who produces hazardous wastes, through any institutional, commercial, industrial or trade activities

A

waste generator

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4
Q

Wastes containing mercury and arsenic should be classified as _____

A

wastes with inorganic materials

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5
Q

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

A

Rubber gloves

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6
Q

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

A

Polyethylene Drums

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7
Q

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

A

sodium bicarbonate

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8
Q

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

A

Ignitability

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9
Q

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

A

Corrosivity

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10
Q

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

A

Reactivity

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11
Q

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

A

Toxicity

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12
Q

Solid waste management practice which refers to the controlled decomposition of organic matter by microorganisms, mainly bacteria and fungi, into a humus-like product

A

Composting

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13
Q

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

A

Compostable wastes

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14
Q

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

A

sharps

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15
Q

These are organic chemicals that are resistant to environmental degradation through chemical, biological, and photolytic processes

A

Persistent Organic Chemicals (POPs)

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16
Q

This refers to any liquid that passes through a landfill and has extracted dissolved and suspended matter from it.

A

Leachate

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17
Q

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

A

True

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18
Q

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

A

False

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19
Q

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

Safety Data Sheet

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20
Q

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

A

Respiratory Sensitizer

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21
Q

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

A

a. acetic acid solution

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22
Q

First consideration for chemical storage shall be based on its:

A

compatibility with other chemicals

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23
Q

Which of the following is an oxidizing chemical?

a. potassium dichromate
b. sodium hydride
c. magnesium
d. sodium

A

. potassium dichromate

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24
Q

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

A

Desiccator

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25
Q

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

A

b. pycnometer

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26
Q

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

A

. fume hood

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27
Q

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

A

False

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28
Q

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.

A

TRUE

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29
Q

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.

A

FALSE

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30
Q

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

A

FALSE

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31
Q

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

A

TRUE

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32
Q

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

A

FALSE

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33
Q

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

A

TRUE

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34
Q

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

A

FALSE

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35
Q

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

A

FALSE

36
Q

TRUE OR FALSE. In calibration of burettes, volume reading shall be taken with the eye higher than the liquid level to avoid parallax error

A

FALSE

37
Q

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

A

. Hydrochloric Acid

38
Q

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

A

chlorine

39
Q

Symbols indicated in waste labels that instantly identify the kind of hazard the chemical possesses

A

Pictogram

40
Q 
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 dichloromethane

41
Q

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

42
Q

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

A

200 ppm

43
Q 
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
A

d. ALL OF THE ABOVE

44
Q

GHS HAZARD SYMBOL:

O na may apoy

A

Oxidizer

45
Q

GHS HAZARD SYMBOL:

May puno yung picture and fish

A

Environmental Hazard

46
Q

GHS HAZARD SYMBOL:

Dalawang test tube na tinapon yung laman in opposite directions

A

Corrosive

47
Q

GHS HAZARD SYMBOL:

parang firework

A

explosive

48
Q

GHS HAZARD SYMBOL:

apoy

A

flammable

49
Q

GHS HAZARD SYMBOL:

exclamation point

A

harmful

50
Q

GHS HAZARD SYMBOL:

skull

A

toxic

51
Q

GHS HAZARD SYMBOL:

Cylinder tank pero mukang dinamita

A

compressed gas

52
Q

GHS HAZARD SYMBOL:

tao na may star sa dibdib

A

health hazard

53
Q

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

54
Q 
Which of the following instruments uses a cuvette?
Flame- AAS 
b. UV-Vis Spectrophotometer
c. Gas Chromotograph
d. pH Meter
A

UV-Vis Spectrophotometer

55
Q

A series of reference standards solutions that have known and accurate pH values at different temperatures used for pH meter calibration.

A

. Buffer Solutions

56
Q

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

. wavelength

57
Q

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

A

pH

58
Q

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

A

Beer-Lambert’s Law

59
Q

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

A

. Matrix Spike

60
Q

A clean sample (e.g., distilled water) processed through the instrumental steps of the measurement process to determine instrument contamination.

A

Instrument Blank

61
Q

Minimum concentration of a substance that can be measured and reported with 99% confidence that the analyte concentration is greater than zero

A

Method Detection Limit

62
Q

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

Systematic Error

63
Q

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

A

Random Error

64
Q

Series of analytical measurements used to assess the quality of the analytical data

A

Quality Control

65
Q

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

A

Light

66
Q

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

A

Nebulizer

67
Q

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

A

. Flame

68
Q

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.

A

Monochromator

69
Q

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

A

Detector

70
Q

Light sensitive samples should be collected in a/an __________ container.

A

. amber bottle container

71
Q

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

72
Q

It is a pure dry solid substance of known chemical composition used in the direct standardization of solution.

A

primary standard

73
Q

The following are different types of sample preservation except:

a. freezing
b. acidification
c. reagent addition
d. filtration

A

. filtration

74
Q

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

A

Accuracy

75
Q

Sample preparation technique used prior to instrumental analysis of metals.

a. acid digestion
b. liquid-liquid extraction
c. sieving
d. clean-up

A

acid digestion

76
Q

. Detects contamination from reagents, sample handling, and the entire measurement process

A

. method blank

77
Q 
Organic compounds in aqueous sample A will be extracted using liquid-liquid extraction. Which of the following is the most appropriate solvent to use?
. methanol
b. water
c. hexane
d. hydrochloric acid solution
A

hexane

78
Q

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

pulverizing

79
Q

Sample preparation in which the sample is allowed to settle by leaving it undisturbed in a vessel.

A

sedimentation

80
Q

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

A

. Acidify with 1mL HNO3 to pH<2

81
Q

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

A

. grab sample

82
Q

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

A

composite sample

83
Q

Which of the following parameters shall be analysed immediately after collection?

a. Density
b. Temperature
c. Viscosity
d. Solids

A

Temperature

84
Q

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

85
Q

Sample preparation that involves the process of decomposition of organic matter

A

ashing

Chem Tech Review (5 decks)

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