Question

you should frequently open and close the crucible when heating the magnesium.
true
false
question 11
how do you put out a magnesium fire? (select all that apply)
hydrochloric acid
water
class d extinguisher
mist fire
dry sand
class abc extinguisher

Explanation:

When heating magnesium in a crucible, frequent opening and closing can introduce air - which may affect the reaction and cause loss of material, so the first statement is false. Magnesium reacts violently with water and hydrochloric acid, and using them to put out a magnesium fire is dangerous. A Class D extinguisher is designed for combustible metal fires like magnesium. Melted fire is not a proper way. Dry sand can be used to smother the fire as it cuts off the oxygen supply. Class ABC extinguishers are for ordinary combustibles, flammable liquids and electrical fires, not for magnesium.

Answer:

False
C. Class D Extinguisher
E. Dry Sand