unit 7 balancing chemical reactions practice test
ficients of 1 for each compound. Single Replacement Example Unbalanced: \[ \text{Zn} + \text{HCl} \rightarrow \text{ZnCl}_2 + \text{H}_2 \] Balanced: \[ \text{Zn} + 2\text{HCl} \rightarrow \text{ZnCl}_2 + \text{H}_2 \] Explanation: Two HCl molecules provide enoug