What are the chemical equations for metals reacting with acids

1-metal + acid → salt + hydrogen gas

e.g    magnesium + dilute sulfuric acid  → magnesium sulfate + hydrogen

         Mg + H2SO4  →  MgSO4 + H2

2-metal oxide + acid  → salt + water

e.g    zinc oxide + dilute hydrochloric acid  → zinc sulfate + water

        ZnO + H2SO4  →  ZnSO4 + H2O

3-metal hydroxide + acid  → salt +water

e.g    zinc hydroxide + dilute nitric acid  → zinc nitrate + water

        Zn(OH)2 + 2HNO3  →  Zn(NO3)2 + 2H2O

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.