When metals react with acids, they displace hydrogen atoms to form hydrogen gas and a compound called a salt.
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When metals react with acids, they produce salts and hydrogen gas. The general equation for this reaction is:
Metal + Acid → Salt + Hydrogen gas
For example, when zinc reacts with hydrochloric acid, zinc chloride and hydrogen gas are formed:
Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g)}
Similarly, the reaction of aluminum with sulfuric acid results in aluminum sulfate and hydrogen gas:
2Al(s) + 3H₂SO₄(aq) → Al₂(SO₄)₃(aq) + 3H₂(g)}
These reactions are examples of metal-acid reactions, where metals displace hydrogen ions from acids to form salts and liberate hydrogen gas.