5g metal Zinc reacts with hydrochloric acid to form hydrogen gas. What is the balanced chemical equation to represent the reaction

Zn (s) + HCl (aq) →  ZnCl₂ (aq) + H₂ (g) ↑

Explanation:

Let's define the reactants:

Zn (s)

HCl (aq)

One of the product is: H₂ (g)

This reaction can also produce ZnCl₂ (s)

Let's make the reaction:

Zn (s) + HCl (aq) →  ZnCl₂ (aq) + H₂ (g) ↑

Notice that the the hydrogen gas is released from the tube, that's why the up arrow.

This is a redox reaction because the Zn and H chage their oxidation states.

Zn ⇄ Zn²⁺ +  2e⁻     Oxidation (it released two electrons)

Oxidation state is increased

2H⁺ + 2e⁻ →  H₂     Reduction (It gained two electrons)  

Oxidation state is decreased

The oxidation state of elements at ground state is 0

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