Risk Assessment for a Reaction Nobody Has Run Here · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.
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Assessing a reaction you have never run

Science · Chemistry · ages 23-24
Name ______________________   Date ____________

  1. What is the worst credible failure?

    • Anything you can imagine going wrong
    • Worst that fits this procedure
    • Only failures seen before in this lab

  2. Where does a written assessment start?

    • With the hazard data for every reagent
    • With the gloves you own
    • With the cleanup rota

  3. Protective equipment is the last control to reach for, not the first.

    Circle one:   True   False

  4. Which control order is right?

    • Gear, administrative, engineering, substitution
    • Substitution, engineering, administrative, gear
    • Engineering, gear, administrative, substitution

  5. A pyrophoric reagent is moved by syringe under inert gas. What is the likeliest trigger for a fire?

    • Filling in the written assessment
    • Working at a small reaction scale
    • Air meeting the reagent

  6. The data sheet warns a reagent attacks airways. What handling choice follows?

    • Work in the open lab
    • Smell it to check the level
    • Contain it and use less

  7. A student names explosion for every procedure. What is the error?

    • The failure must fit this procedure
    • Every lab fears explosions
    • Small scales cannot fail

  8. The run shows the exact temperature drift your stop condition names. What do you do?

    • Adjust cooling and carry on
    • Abandon the run at once
    • Repeat the drift to be sure
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Answer key

For grown-ups. Fold this page away before handing over the rest.

Assessing a reaction you have never run W1-mt_CdotJQjdka-s1

  1. Worst that fits this procedure · Credible means it fits your procedure. Fantasy and history both mislead.
  2. With the hazard data for every reagent · Data first, decisions second. You cannot control what you never looked up.
  3. True · Gear guards one worker. Substitution and containment guard the room.
  4. Substitution, engineering, administrative, gear · Remove or swap the hazard first, then engineer it away from people, then change how people work, and wear gear last.
  5. Air meeting the reagent · A pyrophoric reagent ignites in air, so a leak that lets air reach it is the trigger to name.
  6. Contain it and use less · Airway hazard means keep it contained. Less reagent, less risk.
  7. The failure must fit this procedure · Credible beats scary. Tie the failure to your reagents and steps.
  8. Abandon the run at once · A stop line is a promise. Cross it and the run ends.
Worksheet · LightMySky