you should frequently open and close the crucible when heating the magnesium. \ntrue \nfalse \nquestion 11…

you should frequently open and close the crucible when heating the magnesium. \ntrue \nfalse \nquestion 11 \nhow do you put out a magnesium fire? (select all that apply) \nhydrochloric acid \nwater \nclass d extinguisher \nmist fire \ndry sand \nclass abc extinguisher

you should frequently open and close the crucible when heating the magnesium. \ntrue \nfalse \nquestion 11 \nhow do you put out a magnesium fire? (select all that apply) \nhydrochloric acid \nwater \nclass d extinguisher \nmist fire \ndry sand \nclass abc extinguisher

Answer

Brief Explanations:

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