Worksheet: Hazardous Reagents

In this worksheet, we will practice describing the correct procedures for handling hazardous reagents, including lachrymators and pyrophores.

Q1:

A reaction requires the use of 50 mL of a pyrophoric liquid. Which of the following methods for transferring the liquid would produce the greatest risk?

  • AA single transfer using a 100 mL syringe
  • BA single transfer using a 50 mL syringe
  • CTwo transfers using a 50 mL syringe
  • DContinuous transfer via a cannula
  • EFive transfers using a 20 mL syringe

Q2:

When working with a large volume of pyrophoric reagent in a laboratory, which of the following is not a necessary precaution?

  • AEmergency shower
  • BFire extinguisher
  • COther people
  • DFace shield
  • EGlovebox

Q3:

When using a pyrophoric liquid, which of the following would not reduce the risk of the procedure?

  • AUsing a cannula instead of a syringe
  • BClamping the syringe when taking up the reagent
  • CMeasuring the reagent volume with the smallest suitable syringe
  • DUse of a glovebox
  • EUsing a glovebox

Q4:

When using a pyrophoric liquid, which of the following would not reduce the risk of the procedure?

  • AAvoidance of synthetic clothing
  • BUse of n-butyllithium instead of t-butyllithium
  • CUse of pentane instead of heptane as a solvent
  • DUse of n-hexyllithium instead of n-butyllithium
  • EDiluting the material in heptane before quenching with water

Q5:

When diluting an acid, why is it best to add the concentrated acid to water instead of adding water to the concentrated acid?

  • ADiluting in this way prevents spillage of concentrated acid.
  • BConcentrated acid may damage the container.
  • CIt is easier to control the release of heat and avoid boiling of the solution.
  • DThe acid may precipitate if only a small volume of water is present.
  • EProducing an aqueous solution with a very low pH may cause counterions to undergo reduction–oxidation reactions.

Q6:

Which of the following can react in excess with aqueous potassium cyanide to produce a solution safe for disposal as nonhazardous aqueous waste?

  • ASodium hydroxide
  • BPotassium dichromate
  • CHydrochloric acid
  • DSodium hypochlorite
  • EIsopropanol

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