Paper 2 · Laboratory safety and the microscope
How does a sand bucket help control a fire in a laboratory?
ASand cools the fire by absorbing its heat directly, the same way water lowers a fire's temperature
BSand is spread over the fire, depriving it of oxygen and dousing it
CSand reacts chemically with the flames to neutralise them, similar to a fire extinguisher's foam
DSand is thrown to smother the person, not the fire, which would not stop the flames from spreading
Explanation: Sand deprives the fire of oxygen, dousing it.
Derived from ZIMSEC Biology 4025/2 Paper 2 Theory, June 2019, Q1
