Are these equations balanced? If not how do I balance them?

The answer to your question is given below.

Explanation:

1. CH3COOH(aq) + NaHCO3(s) —> CO2(g) + H2O(l) + Na+(aq) + CH3COO-(aq)

The above equation is balanced since the number of atoms of the different elements present on both sides of the equation are equal.

2. CaCl2 + NaHCO3 —> CO2 + CaCO3 + NaCl + H2O

The above equation can be balance as follow:

There are 2 atoms of Cl on the left side and 1 atom on the right side. It can be balance by putting 2 in front of NaCl as shown below:

CaCl2 + NaHCO3 —> CO2 + CaCO3 + 2NaCl + H2O

Now, there are 2 atoms of Na on the right side and 1 atom on the left side. It can be balance by putting 2 in front of NaHCO3 as shown below:

CaCl2 + 2NaHCO3 —> CO2 + CaCO3 + 2NaCl + H2O

Now the equation is balanced.

the answer is c.the valence of the atoms combine .