Balance the equation __sio2 + __cac2 → __si + __cao + __co2

5SiO2 + 2CaC2 = 5Si + 2CaO + 4CO2

Hey there!:

5 SiO2 + 2 CaC2 = 5 Si + 2 CaO + 4 CO2

Balancing a chemical equation is to equalize the quantity of atoms of the elements present in the reagents with the quantity of these same atoms of the elements present in the products.

Reagents:                                       Products :

Si = 5*1 = 5                                     Si = 5 * 1 = 5

O = 5 * 2 = 10                                 Ca = 2 * 1 = 2

Ca = 2 * 1 = 2                                  O = 2 * 1 = 2

C = 2 * 2 = 4                                   C = 4*1 = 4

                                                      O = 4 * 2 = 8

Reagents = 5 + 10 + 2 + 4 = 21

Produts =  5 + 2 + 2 + 4 + 8 = 21

Hope that helps!