Question

What’s the formula equation for

Magnesium +Oxygen = Magnesium oxide


And


Calcium Carbonate = Calcium oxide + Carbon dioxide

Answer 1

If you have a magnesium for every oxygen, then you have to start with two magnesiums. So the balanced equation is 2 Mg + O2 2 MgO.

And

CaCO3———→CaO + CO2

I hope it helped!

Answer 2

2Mg + O₂ → 2MgO

CaCO₃ → CaO + CO₂