1ldots +O_(2)=2BaO 2.Si+ldots =SiO_(2) 3. K+O_(2)=ldots

1. 2. 3. Explanation:1. The reaction between barium (Ba) and oxygen (O2) produces barium oxide (BaO). To balance the equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation. In this case, we need 4 barium atoms and 2 oxygen atoms on the left side to match the 2 barium atoms and 2 oxygen atoms on the right side. Therefore, the balanced equation is .2. The reaction between silicon (Si) and oxygen (O2) produces silicon dioxide (SiO2). This equation is already balanced, as there is 1 silicon atom and 2 oxygen atoms on both sides of the equation.3. The reaction between potassium (K) and oxygen (O2) produces potassium oxide (K2O). To balance the equation, we need 4 potassium atoms and 2 oxygen atoms on the left side to match the 2 potassium atoms and 2 oxygen atoms on the right side. Therefore, the balanced equation is .