Gas and electricity cut-off switch
Spray the student with foam fire extinguisher
Roll the student on the floor
Spray the student with carbon dioxide extinguisher
Tell the student to run to the principal's office
Walk the student calmly outdoors
Reprimand the student for not tying his/her hair back.
Sealed in a locked cabinet
safely in the preparation room
In the principal's office
Next to the teacher's desk
After each laboratory practical
At the end of each school year
Put the unused solid back ito its jar, as there is a limited school budget for chemicals.
React it with hydrochloric acid to neutralise it.
Wash it down the sink with a copious amount of water.