When can a compound be treated like an element when balancing chemical equations?
a) when there is no change to the atoms in the compound
b) when the compound is made of cations
c) when the compound is made of anions
d) when there is no charge on the molecule

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy