Question

The Diagram below is set-up for the laboratory preparation of oxygen gas.

1. Name solid R
2. Write an equation for the reaction that takes place in the flask.
3. Give one commercial use of oxygen.

Answer 1

1. Manganese (IV) oxide. 
2.                Manganese (IV) Oxide
   2H₂O_2(l)                     O_2(g) + 2H₂O_(l) + 2H₂O_(l)
3.  
   1. Welding
   2. Steel making
   3. Breathing aid/ hospitals