Explain What type of chemical reaction is this? \( \mathrm{Zn}+2 \mathrm{HCl} \rightarrow \mathrm{ZnCl}_{2}+\mathrm{H}_{2} \) Check your answer.

The chemical reaction you've provided is: \[ \mathrm{Zn} + 2\,\mathrm{HCl} \rightarrow \mathrm{ZnCl}_{2} + \mathrm{H}_{2} \] **Type of Reaction: Single Replacement (Single Displacement) Reaction** ### **Explanation:** 1. **Reactants and Products:** - **Reactants:** Zinc (\(\mathrm{Zn}\)) and Hydrochloric Acid (\(\mathrm{HCl}\)) - **Products:** Zinc Chloride (\(\mathrm{ZnCl}_{2}\)) and Hydrogen Gas (\(\mathrm{H}_{2}\)) 2. **Single Replacement Reaction Characteristics:** - In a single replacement reaction, one element replaces another element in a compound. - The general form is: \[ \mathrm{A} + \mathrm{BC} \rightarrow \mathrm{AC} + \mathrm{B} \] - Here, Zinc (\(\mathrm{Zn}\)) replaces Hydrogen (\(\mathrm{H}\)) in Hydrochloric Acid (\(\mathrm{HCl}\)). 3. **Redox Aspect:** - **Oxidation:** Zinc is oxidized from 0 oxidation state in \(\mathrm{Zn}\) to +2 in \(\mathrm{ZnCl}_{2}\). - **Reduction:** Hydrogen is reduced from +1 in \(\mathrm{HCl}\) to 0 in \(\mathrm{H}_{2}\). 4. **Activity Series Confirmation:** - Zinc is higher than hydrogen in the reactivity (activity) series of metals, which allows it to displace hydrogen from acids like \(\mathrm{HCl}\). ### **Balanced Reaction Check:** - **Atoms Count:** - **Left Side:** 1 Zn, 2 H, 2 Cl - **Right Side:** 1 Zn, 2 H, 2 Cl - **Charge Balance:** - All species are balanced in terms of charge. The reaction is correctly balanced and appropriately classified. ### **Conclusion:** This reaction is a **single replacement (single displacement) reaction** where zinc displaces hydrogen from hydrochloric acid to form zinc chloride and hydrogen gas.