Questions and Answers
What should be done with items contaminated with hazardous materials before removal from the hood?
Which chemical should not be stored with ammonia solution?
What is the primary consideration when storing chemicals?
Which of the following chemicals is classified as an oxidizer?
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What should be avoided while operating a UV-Vis spectrophotometer?
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Which of the following equipment does NOT require annual third-party calibration?
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In starting up laboratory operations, which should be done first?
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What action should be taken before turning on the UV-Vis spectrophotometer?
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What pH level qualifies waste as ‘alkali waste’?
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Which of these describes a person who produces hazardous wastes?
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Which hazardous waste characteristic applies to aqueous solutions with a pH less than or equal to 2 or greater than or equal to 12.5?
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What defines ignitability in hazardous waste?
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What best describes residual wastes?
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Which waste materials are classified as hazardous due to their ability to puncture skin?
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What is the definition of reactivity in the context of hazardous waste?
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What characteristic of hazardous waste applies to any material that is unstable or has explosive potential?
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Which hazardous waste characteristic indicates the potential to contaminate groundwater if improperly disposed of?
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What is the term for organic chemicals that resist environmental degradation?
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Which method is recognized as a solid waste management practice that breaks down organic matter?
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What is the term used for liquid that has extracted dissolved and suspended matter from a landfill?
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What practice should be avoided when handling liquid chemicals?
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Which of the following describes a characteristic of waste that is able to ignite easily?
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Which term refers to the process of cleaning up contaminated environments using biological methods?
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Which hazardous characteristic does NOT imply a material's ability to corrode?
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What is the correct method for using a pipette marked with 'To Deliver' (TD)?
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Which statement about cuvette cleaning is true?
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What must be true about opposing tubes when operating a centrifuge?
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What should be avoided to ensure thorough cleaning of glassware?
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What is the expected concentration of potassium dichromate in Solution 2 expressed in two significant figures?
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Which statement about Class B volumetric glassware is correct?
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What is the titration reaction equation for sodium hydroxide and hydrochloric acid?
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When reading the volume on a burette, at what position should your eye be in relation to the liquid level?
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What laboratory glassware is appropriately used to measure 25.0 mL of sodium hydroxide?
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How should dilutions with volumetric flasks be performed for accuracy?
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What is a common misconception regarding the cleaning of laboratory glassware?
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In Solution 5, what is the concentration of potassium dichromate expressed in two significant figures?
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Which statement is true regarding the disposal of broken laboratory glassware?
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What is the correct approach to storing concentrated acids and bases?
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What is the concentration of potassium dichromate in Solution 3, expressed in two significant figures?
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Which statement regarding fire extinguishers in laboratories is false?
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Study Notes
Chemical Storage and Safety
- Storage cabinets should be used for corrosives, oxidizers, carcinogens, and respiratory sensitizers.
- Contaminated items must be decontaminated or placed in closed outer containers before removal from hoods.
Ammonia Solution Compatibility
- Ammonia solution cannot be stored with acetic acid, sodium hydroxide, 2-propanol, or cyclohexane.
Chemical Storage Considerations
- Prioritize storage based on the frequency of usage, compatibility, container size, and alphabetical order.
UV-Vis Spectrophotometer Operation
- Check sample holder is empty before powering up, avoid keeping the sample compartment open during specific pH operations.
Waste Classification
- Waste is considered “alkali” if pH is above 12.5.
- Waste generation is defined by activities producing hazardous materials.
Hazardous Waste Characteristics
- Ignitability applies to waste with flash points below 140°F.
- Corrosivity is relevant for aqueous solutions with pH ≤ 2 or ≥ 12.5.
- Reactivity is for materials that are unstable or explosive when mixed with water.
Solid Waste Management Practices
- Composting aids in controlled decomposition; recycling and reducing waste are key practices.
Dilution and Concentration Calculations
- Understanding volumes and concentrations is essential for proper chemical preparation and analysis.
True or False Statements
- Concentrated acids and bases should be stored in corrosion-resistant materials.
- Fire extinguishers must be accessible near chemical storage areas, contrary to safety practices.
Glassware and Measurement Techniques
- Pipettes and burettes are fundamental for accurate measurements in titration processes.
General Laboratory Safety Guidelines
- Always handle liquid chemicals carefully and protect against splashes with appropriate gear.
- Never dispose of hazardous waste or broken glassware in regular trash; follow proper disposal protocols.
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Description
Test your knowledge on effective chemical storage and safety practices. This quiz covers essential topics such as compatibility of chemicals, handling hazardous waste, and operating UV-Vis spectrophotometers safely. Ensure you are well-versed in proper procedures to minimize risks in the lab.