Worksheet: Hazardous Reagents

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


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


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

  • AOther people
  • BFace shield
  • CFire extinguisher
  • DCooling the reagent
  • EEmergency shower


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


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


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.


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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