Chemical Technician 1 Practice Exam

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• In recording laboratory results, always indicate the date of analysis.
• Law that states the linear relationship between absorbance and concentration of an absorbing species
• Which technique is used to separate solids by size prior to metal analysis?
• Which instrument determines the intensity of photons of the analytical line exiting the monochromator?
• Which hazard is indicated by the GHS symbol for an oxidizer?
• In recording laboratory results, the following shall be done, except: Use permanent ink, When an error is committed, put multiple lines to cross out the wrong data, Always indicate the date of analysis, Record all necessary details including qualitative observations.
• Which term best describes waste that has been treated to immobilize contaminants and reduce mobility?
• What is the method of passing the sample through a uniform mesh to separate particles by size?
• Which of the following is not a sample size reduction technique for solid samples?
• Which parameter shall be analyzed immediately after collection?
• Detects contamination from reagents, sample handling, and the entire measurement process.
• What term describes processing a sample to achieve uniform texture by breaking it down into smaller parts and blending?
• Which hazard is indicated by the GHS symbol for flammable substances?
• Broken laboratory glassware should be disposed directly in trash cans or garbage bins.
• Which of the following is not an ideal location for installing an analytical balance?
• Which of the following must NOT be done when using an analytical balance?
• Which instrument is used for measuring and transferring small volumes of liquids?
• Which of the following must be performed before using the analytical balance?
• Which technique is described as breaking down solids into smaller units using mechanical energy with a vibrating base, suitable for wet or dry state?
• A sample comprising two or more increments selected to represent the material being analyzed is called what?
• Which acid is used to preserve water samples intended for metals analysis?
• Which of the following is NOT a good sampling practice?
• Which hazard is indicated by the GHS symbol for explosives?
• It is a 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.
• What type of container must be used for acid or alkali wastes?
• Which indicator shows a color change from colorless to pink?
• Which hazard is indicated by the GHS symbol for an oxidizer?
• Which process concentrates volatile analytes by heating and condensing the vapor, then collecting the condensate?
• In operating the centrifuge, opposing tubes must be of equal weights.
• Which container protects hygroscopic chemicals from humidity?
• Seal able enclosures containing desiccants used to protect chemicals which are hygroscopic or which react with water from humidity.
• What term refers to waste items designed to cut or puncture skin and sharps contaminated with human blood and body fluids?
• Wastes can be stored in fume hoods or near the sink.
• In cases of acid spills, which of the following can be applied to the spill before treating it with adsorbent material?
• Which instrument is used for measuring the volume of liquids?
• 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.
• The process by which a sample is heated to the boiling point of the solvent and volatile analytes are concentrated in the vapour phase, condensed and collected is called what?
• According to the material, Acid/Base titration corresponds to which general type of titration?
• Which container material is most suitable for storing acids or alkalis due to chemical compatibility?
• Which of the following wastes is classified as non-halogenated?
• Which practice should not be done when using a cuvette?
• What is the term for a blank prepared from a clean sample and carried through the entire instrument workflow to assess instrument contamination?
• Which symbol on waste labels instantly identifies the kind of hazard the chemical possesses?
• Phenol Red changes color from yellow to which color?
• Which component destroys any analyte ions and breakdown complexes to create atoms (the elemental form) of the element of interest?
• Karl Fischer titration is used to determine the water content of liquids.
• Methyl Orange changes color from which to which?
• In analytical measurements, which term describes the closeness of the result to the true value?
• A primary standard is defined as which of the following?
• Containers previously containing laboratory reagents are not considered as hazardous waste.
• What is the minimum cyanide concentration in waste to be classified under A101 (waste containing cyanide)?
• Containers previously containing laboratory reagents are hazardous waste.
• 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.
• Purchasing of mercury-containing instruments must be avoided.
• Which practice regarding mercury-containing instruments is recommended?
• It is the measure of hydrogen ion activity in aqueous solutions.
• Which term describes the mechanical cutting of a sample into smaller parts?
• In handling acid wastes, what type of protective gloves should be used?
• 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.
• 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.
• Cuvettes must be cleaned in an ultrasonic cleaning bath.
• Which chemical is usually used to disinfect waste containing microbial organisms?
• Which waste category includes needles, scalpels, and other sharp items contaminated with blood or body fluids?
• In determination of chlorides using argentometric titration, what indicator shall be used?
• What term describes the minimum concentration of a substance that can be measured and reported with 99% confidence that the analyte concentration is greater than zero?
• Which instrument is used to transfer a precise volume of liquid into a container for preparing standard solutions?
• Which sampling method is described by forming a cone of material and dividing into piles for sub-sampling?
• Which option lists Chlorine as the disinfectant used for waste containing microbial organisms?
• Store concentrated acids and bases separately in enclosures made of corrosion-resistant materials.
• What is an approved method for treating waste containing live microorganisms?
• In storing liquid wastes, leave enough amount of head space in the container to allow for expansion and safe transportation.
• Which glassware is typically used to mix, stir, and heat liquids?
• Which of the following wastes is not classified as inorganic waste?
• Type of quality-control sample used to evaluate the effects of sample matrices on the performance of an analytical method
• Which device would protect hygroscopic substances from humidity during storage?
• Class B volumetric glass ware provides the highest accuracy and passes the ASTM standard specification for laboratory volumetric glass ware.
• Which instrument component separates and transmits a narrow portion of the optical signal chosen from a wider range of wavelengths available at the input?
• It is best to place the acid dilution in which environment to minimize the exotherm?
• Fractional distillation separates components based on boiling points. Which compound is recovered first when the following boiling points are considered: Dichloromethane 39.6°C, n-hexane 68°C, Xylene 140°C?
• Pyridine waste is halogenated.
• To avoid parallax error when reading volumes, the eye should be at a level aligned with the liquid surface.
• During startup of laboratory operations, which of the following should NOT be observed?
• What is the recommended pre-start check for a UV-Vis spectrophotometer before turning it on?
• In sample acceptance, which of the following shall be checked?
• A grab sample is defined as a single sample taken at a specific time.
• Which statement about conductivity and temperature is correct?
• For pipettes marked with To Deliver (TD), a small amount remaining on the tip should not be blown out.
• What term describes a liquid that has passed through a landfill and has extracted dissolved and suspended matter from it?
• Which option correctly identifies a halogenated waste?
• A solid waste management practice which refers to the controlled decomposition of organic matter by microorganisms, mainly bacteria and fungi, into a humus-like product.
• Which practice must be avoided in handling chemicals?
• According to the material, Redox titration corresponds to which general type of titration?
• Which chemical is used to neutralize waste containing caustic soda?
• The Karl Fischer titrator is used to determine viscosity of liquids.
• Beer-Lambert's Law describes the relationship between absorbance and which quantities?
• In operating a UV-Vis spectrophotometer, the following shall be done, except for:
• In the pH measurement context, the statement 'If the solution is acidic, H+ ions diffuse out of the layer and a negative charge is established on the outer side of the membrane' is:
• For pipettes marked with To Deliver (TD), the remaining liquid on the tip should be blown out.
• Which cleaning practice should be avoided when preparing cuvettes for measurement?
• Which hazard is indicated by the GHS symbol depicting a dead tree and fish?
• Which is the correct volume reading combination: 6.6 mL and 2.3 mL?
• Which device selects and transmits a narrow spectral band before detection?
• A series of reference standard solutions with known and accurate pH values at different temperatures is used for calibrating which instrument?
• Always wear protective gear when working with hazardous chemicals.
• Sample preparation in which the sample is allowed to settle by leaving it undisturbed in a vessel.
• Which of the following will NOT cause drift errors in an analytical balance?
• Which hazard is indicated by the GHS symbol for corrosive substances that can cause severe skin burns?
• Which preservation step is recommended for water samples intended for metals determination when analysis cannot be performed immediately?
• Which statement describes a minimum requirement for Hazardous Waste storage facilities?
• Bromocresol Green changes color from yellow to which color?
• Which group of organic chemicals resists environmental degradation through chemical, biological, and photolytic processes?
• Which waste is classified as halogenated waste?
• Which component of error arises from unpredictable variations of influence quantities?
• Which document should be consulted to determine first-aid measures, fire-fighting measures, and personal protective equipment for a chemical?
• The subsampling method in which the sample is formed into a pile, spread into a disk, divided into four parts and one opposite pair is used as the laboratory sample. What is this method called?
• Which subsampling device is used to split a sample into smaller portions?
• In maintenance and storage of pH meters, which procedure shall not be done?
• Which statement about desiccators is NOT true?
• Liquids must be stored with secondary containment bins.
• Store hazardous chemicals above eye level.
• What pH threshold defines acidic waste?
• Waste containing pyridine is classified as non-halogenated waste.
• Which hazardous waste characteristic is defined by a very low flash point, indicating a tendency to ignite easily?
• Which chemical may be used to neutralize waste containing phosphoric acid?
• Which document provides information on chemical hazards, safe handling, and emergency measures, and often contains multiple sections?
• What pH threshold defines alkali waste?
• This refers to a person who produces hazardous wastes through institutional, commercial, industrial or trade activities.
• Which hazard is indicated by the GHS symbol for corrosive substances?
• Which method involves mechanical cutting of the sample into smaller parts?
• Which device is used to aerosolize the sample before introduction to the flame?
• Organic compounds in aqueous sample A will be extracted using liquid-liquid extraction. Which of the following is the most appropriate solvent to use?
• In calibration of burettes, volume reading shall be taken with the eye higher than the liquid level to avoid parallax error.
• What is the purpose of using buffer solutions in pH meter calibration?
• Which type of chemical can cause an allergic reaction in the airways following inhalation?
• Light-sensitive samples should be collected in which container?
• Which of the following is a cause of contamination during the sample preparation?
• The alkaline effect is the phenomenon where H+ ions in the gel layer of the pH-sensitive membrane are partly and completely replaced by alkali ions.
• Unidentified chemical waste can be disposed together with the other unidentified chemical waste.
• Wastes containing live microorganisms can be treated by autoclaving or chemical disinfection.
• Ammonia solution should not be stored with which of the following substances?
• The following are different types of sample preservation except:
• Which component converts photons into an electrical signal for measurement?
• Which device creates a fine aerosol for introduction into the flame?
• Which of the following are possible routes of exposure to hazardous waste?
• 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 be uniform.
• Which hazard is indicated by the GHS symbol for explosives?
• Which statement is true about using a fume hood?
• Which formula should be used to prepare a 0.3 N NaOH solution from a 5 N NaOH solution?
• According to the material, Precipitation titration corresponds to which general type of titration?
• Which of the following shall not be followed when boiling a solution in a hot plate?
• Keep fire extinguishers away from locations where chemicals are stored or used.
• A Safety Data Sheet usually contains about how many headings?
• Which subsampling method involves collecting a sample at a single point in time?
• According to revised DAO 04-36, which items shall be included on appropriate waste labels?
• Which term refers to a single sample or measurement taken at a specific time?
• What is the term for a series of analytical measurements used to assess the quality of the analytical data?
• Which term describes wastes that biodegrade into compost under controlled conditions?
• Which instrument uses a cuvette?
• Which provides the analytical light line for the element of interest?
• It is the closeness of the agreement between the result of a measured value and a true value.
• Nitrates and potassium dichromate are considered as waste oxidizers.
• Which hazardous waste characteristic is associated with extreme pH values (≤ 2 or ≥ 12.5)?
• To determine the specific gravity of a liquid, which of the following glass wares should be used?
• 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.
• Effluent is the wastewater discharged from a plant after treatment.
• Liquids must be stored with secondary containment bins.
• Which glassware is designed to prepare a solution to a precisely known final volume?
• Ammonia solution can be stored with the following chemicals except for:
• Phenolphthalein changes color from colorless to which color?
• Which method compares an unknown sample to standard samples with known concentrations to determine its concentration?
• First consideration for chemical storage shall be based on its:
• Which hazard is indicated by the GHS symbol for explosives?
• 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.
• Which device is used for precise dilutions and preparation of standard solutions?
• Preparation of highly toxic and volatile compounds should be carried out in an efficient __________.
• 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.
• The residual water film on the inner surface of glassware after cleaning should be uniform.
• In using fume hoods, the following shall be done, except for:
• According to the material's titration classification, Complexometric titration corresponds to which general type?
• Phenol Red changes color from yellow to which color?
• Which hazard is indicated by the GHS symbol for environmental hazard?
• Which of the following is an oxidizing chemical?
• Which sample preparation step involves the decomposition of organic matter?
• In the alkaline effect observed in pH-sensitive membranes, which ions partially replace the hydrogen ions in the gel layer?
• Which component of error remains constant or varies in a predictable way over a series of analyses of the same measurand?
• According to the material, which general type is assigned to a titration described as Complexometric?
• Which sampling practice ensures variability over process cycles by collecting samples frequently?
• Always wear eye and face protection, lab coat and gloves when working with hazardous chemicals.
• Which of the following is a recommended practice when boiling a solution on a hot plate?
• From the diagram, determine the volume of the following: 24 mL and 75 mL, 25 mL and 75 mL, 24 mL and 74 mL, or 25 mL and 73 mL.
• Which of the following does not require a minimum of annual third party calibration?
• Which indicator changes color from yellow to blue?
• Which quality-control sample is used to evaluate the effects of sample matrices on the performance of an analytical method?
• Sample preparation technique used prior to instrumental analysis of metals.
• Where should a sample be placed on the analytical balance pan to ensure accurate measurement?
• Which practice minimizes contamination during sample preparation?
• Where should broken laboratory glassware be disposed?
• What term denotes wastewater released from a manufacturing, industrial, or treatment plant after processing?
• Which of the following is a size reduction technique for solids?
• Wastes containing mercury and arsenic should be classified as what type of waste?
• A clean sample (e.g., distilled water) processed through the instrumental steps of the measurement process to determine instrument contamination is called what?
• Which term describes waste materials that can be retrieved from the waste stream for potential beneficial use if contamination is removed?
• The conductivity value of a liquid increases as the temperature decreases as a result of higher ion mobility.
• Which glassware is designed to deliver a known volume when filled to a mark?
• Which term best describes a primary standard?
• Which tool is used to pipette a precise volume to prepare a standard solution?
• Which action should be avoided when preserving water samples for metals analysis if immediate analysis is not possible?
• Head space in liquid waste containers should be avoided.
• Solutions containing high concentrations of ammonia are considered as corrosive waste.