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Chemistry 9 Online
OpenStudy (anonymous):

(Combination reaction) Ca + O2 --> ? So, the answer isn't simply CaO2? How do I do these? . _.

OpenStudy (anonymous):

The balanced equation would be 2Ca+O2--> 2CaO

OpenStudy (joannablackwelder):

Ca is a metal and O is a nonmetal. So, they will make an ionic compound. Thus the ionic charges must cancel out. Ca is 2+. O is 2-. So they must combine as CaO.

OpenStudy (anonymous):

Thank you both!

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