Question

7th grade Science...

Answer 1

C

Step-by-step explanation:

CaCO3 = CaO + CO2

O = 3 O = 1 + 2 = 3

C = 1 C = 1

Ca = 1 Ca = 1

The number of atoms in each element is the same on each the reactant side and the products side.

Answer 2

The answer is B Because