Magnesium burns brightly in the presence of oxygen. When ...

[sammy]

Magnesium burns brightly in the presence of oxygen. When magnesium reacts with oxygen, the compound formed is
 
  A) MgO.
  B) MgO3.
  C) Mg3O.
  D) Mg4O4.

Question 2

Which of the following statements about technologically important elements is true?
 
  A) China has a virtual monopoly on the rare earth metals.
  B) The U.S. still has large deposits of high-grade ores.
  C) It requires more energy to extract these metals from high-grade ores than from low-grade ores.
  D) The U.S. and other industrial nations are nearly 100 self-sufficient for these metals.

[sokh]

Answer to Question 1

A

Answer to Question 2

A