Question detail
A preparation may release irritating acidic fumes when a reagent is added dropwise. Which control best reduces the main risk to students?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
A-level practical endorsement and required practical activities
Question
- A. A. Carry out the addition in a fume cupboard while wearing eye protection and adding the reagent slowly.
- B. B. Stand further away but leave the vessel open on the bench so the fumes disperse.
- C. C. Use a larger measuring cylinder so the addition can be completed in one rapid pour.
- D. D. Ignore the fumes if the reaction mixture is below room temperature.
Answer
A. Carry out the addition in a fume cupboard while wearing eye protection and adding the reagent slowly.
Explanation
This answer supports risk management because it identifies the specific hazard, acidic vapour, and chooses controls that reduce inhalation and splash risk. Slow addition also controls reaction rate and heat release. The other options either increase exposure, reduce control of the reaction, or dismiss a chemical hazard without evidence.
Common mistake
Ignoring Safety Protocols
Students often overlook the importance of wearing appropriate personal protective equipment (PPE) during practical experiments, which can lead to accidents or injuries.
Always follow safety guidelines by wearing gloves, goggles, and lab coats. For example, when handling acids, the rule is to wear gloves and goggles to protect skin and eyes. This ensures a safe working environment. Keep the correction anchored to A-level practical endorsement and the objective: Apply risk management and safe working in practical contexts.
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