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Laboratory Materials quiz #3

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  • Which is an appropriate ritual of renewal for all chemical services?
    Regularly reviewing and updating safety procedures is an appropriate ritual of renewal.
  • Which measuring tool should be used to measure the diameter of a soda can?
    A caliper should be used to measure the diameter of a soda can.
  • What is necessary for the use of chemical vapor sterilization?
    Proper ventilation and compatible containers are necessary for chemical vapor sterilization.
  • Which would be a common-sense practice in a lab environment?
    Wearing PPE and following safety protocols are common-sense practices.
  • What are four guidelines for properly storing chemicals?
    Store chemicals in labeled containers, segregate by compatibility, keep in secure areas, and maintain proper ventilation.
  • When must a meniscus be considered in measurements?
    A meniscus must be considered when measuring liquid volume in a graduated cylinder.
  • What is the purpose of processing a substance with a mortar and pestle?
    A mortar and pestle are used to grind solids into fine powders for easier mixing or reaction.
  • Which piece of lab equipment is used to measure the mass of a chemical sample?
    A balance is used to measure the mass of a chemical sample.
  • In an Erlenmeyer flask, what is its primary use?
    An Erlenmeyer flask is primarily used for mixing and transferring solutions.
  • Where should the volume be read on a graduated cylinder to get the best estimate?
    The best estimate is the value read at the bottom of the meniscus at eye level.
  • Which safety rule is most important when smelling the product of a chemical reaction?
    Use the wafting technique to avoid direct inhalation of fumes.
  • What laboratory equipment is used to measure large amounts of liquids for reagents?
    Beakers are used to measure and hold large amounts of liquids.
  • What is the field of chemistry that best describes this laboratory?
    Analytical chemistry best describes a laboratory focused on measurement and analysis.
  • Approved eye protection devices are worn in the laboratory for what reason?
    Eye protection is worn to prevent injury from chemical splashes and debris.
  • ___ accurately measure liquids.
    Volumetric flasks and burettes accurately measure liquids.
  • Return all unused chemicals to their original containers.
    Unused chemicals should not be returned to original containers to avoid contamination.
  • When gathering glassware and equipment for an experiment, you should
    Inspect for cleanliness and damage before use.
  • Determine when you should remove your goggles in the lab room.
    Remove goggles only after all experiments are complete and the area is clean.
  • After completing an experiment, all chemical wastes should be
    Disposed of according to laboratory waste disposal guidelines.
  • Using tongs to pick up broken glass is a good practice.
    True; tongs protect your hands from cuts when handling broken glass.
  • The best way to protect yourself from solvent hazards is to
    Work in a well-ventilated area and wear appropriate PPE.
  • If you drop or break glassware in lab, first
    Notify your instructor and clean up using appropriate tools.
  • Return all unused chemicals to their original containers.
    Do not return unused chemicals to original containers; dispose of them properly.
  • You are heating a substance in a test tube. Always point the open end of the tube
    Away from yourself and others.
  • For a classroom demonstration a chemistry teacher
    Should follow all safety protocols and use appropriate PPE.
  • When cleaning a buret, begin by coating the inside with
    Use a small amount of the titrant solution to rinse and coat the inside.
  • How should students prepare to use chemicals in the lab?
    Read labels and SDS, wear PPE, and follow instructions.
  • The HazCom requires all of the following to be included on chemical labels:
    Product identifier, hazard pictograms, signal word, and precautionary statements.
  • Select the Erlenmeyer flask.
    The Erlenmeyer flask has a conical body and narrow neck.
  • A Safety Data Sheet (SDS) provides even more information on chemicals than a label.
    True; an SDS provides detailed safety and handling information.
  • A graduated cylinder is used to measure the volume of a
    Liquid.
  • What is the proper way to hold glassware when serving?
    Hold glassware securely with both hands and avoid tilting.
  • Which piece of lab equipment measures the volume of a liquid?
    A graduated cylinder measures the volume of a liquid.
  • The location you use for mixing chemicals must be
    Well-ventilated and equipped with safety equipment.
  • When using the tare function on a balance, start by
    Placing the empty container on the balance and pressing the tare button.
  • A tool used to measure the mass of an object or substance
    A balance is used to measure mass.
  • In a conductivity apparatus, like the one above, you should never touch the while the power is on.
    Never touch the electrodes while the power is on.