Answer:
5SiO2 + 2CaC2 --> 5Si + 2CaO + 4CO2
4NH3 + 5O2 --> 4NO + 6H2O
Step-by-step explanation:
In a balanced chemical equation, the number of atoms of an element on the reactant side must equal the number of atoms on the product side. On each side of the first equation, there are 5 silicon atoms, 10 oxygen atoms, 2 calcium atoms, and 4 carbon atoms. Then on each side of the second equation, there are 4 nitrogen atoms, 12 hydrogen atoms, and 10 oxygen atoms.