unit 7 balancing chemical reactions practice test
}_4 + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2O \] Balanced: \[ \text{CH}_4 + 2\text{O}_2 \rightarrow \text{CO}_2 + 2\text{H}_2O \] Explanation: Carbon and hydrogen are balanced first, then oxygen is balanced by a