What type of equation is this? Is it balanced?

Question

Mg+O2=MgO

Answer 1

This is a chemical equation, specifically a reaction between magnesium and oxygen to form magnesium oxide. It is not balanced as written. To balance it, the equation would be:

2Mg + O2 = 2MgO

Now it is balanced with two magnesium atoms reacting with one oxygen molecule to form two magnesium oxide molecules.