Chemical Safety and Storage Practices
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Questions and Answers

What should be done with items contaminated with hazardous materials before removal from the hood?

  • They can be removed without any precautions.
  • They should be left in the hood indefinitely.
  • They should be decontaminated or placed in a closed container. (correct)
  • They should be destroyed immediately.

    • Which chemical should not be stored with ammonia solution?

  • Acetic acid solution. (correct)
  • Cyclohexane solution.
  • 2-Propanol solution.
  • Sodium hydroxide solution.

    • What is the primary consideration when storing chemicals?

  • Frequency of usage
  • Cost of the chemicals
  • Compatibility with other chemicals (correct)
  • Size of the container

    • Which of the following chemicals is classified as an oxidizer?

    <p>Potassium dichromate</p> Signup and view all the answers

    What should be avoided while operating a UV-Vis spectrophotometer?

    <p>Keeping the sample compartment open during use.</p> Signup and view all the answers

    Which of the following equipment does NOT require annual third-party calibration?

    <p>Sets of weights</p> Signup and view all the answers

    In starting up laboratory operations, which should be done first?

    <p>Turning on the hoods, vents, and exhaust fans.</p> Signup and view all the answers

    What action should be taken before turning on the UV-Vis spectrophotometer?

    <p>Check if the sample holder is empty.</p> Signup and view all the answers

    What pH level qualifies waste as ‘alkali waste’?

    <p>pH &gt; 12.5</p> Signup and view all the answers

    Which of these describes a person who produces hazardous wastes?

    <p>Waste generator</p> Signup and view all the answers

    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?

    <p>Corrosivity</p> Signup and view all the answers

    What defines ignitability in hazardous waste?

    <p>Flash point less than 140°F</p> Signup and view all the answers

    What best describes residual wastes?

    <p>Material that can no longer be beneficially reused</p> Signup and view all the answers

    Which waste materials are classified as hazardous due to their ability to puncture skin?

    <p>Hazardous glass and plastics</p> Signup and view all the answers

    What is the definition of reactivity in the context of hazardous waste?

    <p>Generation of toxic fumes upon interaction with water</p> Signup and view all the answers

    What characteristic of hazardous waste applies to any material that is unstable or has explosive potential?

    <p>Reactivity</p> Signup and view all the answers

    Which hazardous waste characteristic indicates the potential to contaminate groundwater if improperly disposed of?

    <p>Toxicity</p> Signup and view all the answers

    What is the term for organic chemicals that resist environmental degradation?

    <p>Persistent Organic Chemicals (POPs)</p> Signup and view all the answers

    Which method is recognized as a solid waste management practice that breaks down organic matter?

    <p>Composting</p> Signup and view all the answers

    What is the term used for liquid that has extracted dissolved and suspended matter from a landfill?

    <p>Leachate</p> Signup and view all the answers

    What practice should be avoided when handling liquid chemicals?

    <p>Carrying acid in an open container</p> Signup and view all the answers

    Which of the following describes a characteristic of waste that is able to ignite easily?

    <p>Ignitability</p> Signup and view all the answers

    Which term refers to the process of cleaning up contaminated environments using biological methods?

    <p>Bioremediation</p> Signup and view all the answers

    Which hazardous characteristic does NOT imply a material's ability to corrode?

    <p>Dermatitis potential</p> Signup and view all the answers

    What is the correct method for using a pipette marked with 'To Deliver' (TD)?

    <p>Allow a small amount of liquid to remain in the tip.</p> Signup and view all the answers

    Which statement about cuvette cleaning is true?

    <p>Cuvettes should be cleaned in an ultrasonic cleaning bath.</p> Signup and view all the answers

    What must be true about opposing tubes when operating a centrifuge?

    <p>They must be of equal weight.</p> Signup and view all the answers

    What should be avoided to ensure thorough cleaning of glassware?

    <p>Leaving a uniform film of water on glassware.</p> Signup and view all the answers

    What is the expected concentration of potassium dichromate in Solution 2 expressed in two significant figures?

    <p>3.1 mol/L</p> Signup and view all the answers

    Which statement about Class B volumetric glassware is correct?

    <p>It does not meet ASTM standards.</p> Signup and view all the answers

    What is the titration reaction equation for sodium hydroxide and hydrochloric acid?

    <p>NaOH(aq) + HCl(aq) ↔ NaCl(aq) + H2O(l)</p> Signup and view all the answers

    When reading the volume on a burette, at what position should your eye be in relation to the liquid level?

    <p>Higher than the liquid level.</p> Signup and view all the answers

    What laboratory glassware is appropriately used to measure 25.0 mL of sodium hydroxide?

    <p>Pipette</p> Signup and view all the answers

    How should dilutions with volumetric flasks be performed for accuracy?

    <p>Dilute to the mark with distilled water.</p> Signup and view all the answers

    What is a common misconception regarding the cleaning of laboratory glassware?

    <p>All glassware can be cleaned the same way.</p> Signup and view all the answers

    In Solution 5, what is the concentration of potassium dichromate expressed in two significant figures?

    <p>1.2 x 10^-2 mol/L</p> Signup and view all the answers

    Which statement is true regarding the disposal of broken laboratory glassware?

    <p>It should be collected in designated sharps containers.</p> Signup and view all the answers

    What is the correct approach to storing concentrated acids and bases?

    <p>They should be stored separately in corrosion-resistant materials.</p> Signup and view all the answers

    What is the concentration of potassium dichromate in Solution 3, expressed in two significant figures?

    <p>0.61 mol/L</p> Signup and view all the answers

    Which statement regarding fire extinguishers in laboratories is false?

    <p>Fire extinguishers can be stored under chemical fume hoods.</p> Signup and view all the answers

    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.

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