Zinc is added to a beaker containing hydrochloric acid, and the beaker gets warm. What type of reaction is this?

Apr 5, 2017

This is a redox reaction...........that also happens to be an exothermic reaction.

Explanation:

Zinc metal is oxidized to zinc ion:

$Z n \left(s\right) \rightarrow Z {n}^{2 +} + 2 {e}^{-}$ $\left(i\right)$

Hydrogen ion is REDUCED to dihydrogen gas:

$2 {H}_{3} {O}^{+} + 2 {e}^{-} \rightarrow {H}_{2} \left(g\right) \uparrow + {H}_{2} O \left(l\right)$ $\left(i i\right)$

For the overall reaction, we simply add $\left(i\right)$ to $\left(i i\right)$

$Z n \left(s\right) + 2 H C l \left(a q\right) \rightarrow Z n C {l}_{2} \left(a q\right) + {H}_{2} \left(g\right) \uparrow$