* New substances are formed: When zinc reacts with sulfuric acid, it forms zinc sulfate (ZnSO₄) and hydrogen gas (H₂). These are entirely different substances from the original zinc and sulfuric acid.
* Chemical bonds are broken and formed: The reaction involves breaking the bonds in zinc and sulfuric acid and forming new bonds to create zinc sulfate and hydrogen.
* Irreversible (in most cases): While you could technically try to reverse the reaction, it's not easily done and wouldn't be the same process as dissolving the zinc in the first place.
Here's the chemical equation for the reaction:
Zn(s) + H₂SO₄(aq) → ZnSO₄(aq) + H₂(g)
Key points to remember:
* Chemical changes involve the formation of new substances.
* Physical changes only alter the appearance or state of matter, not its chemical composition.
* Dissolving a substance in a solvent can sometimes be a physical change (like dissolving sugar in water), but in this case, the reaction with sulfuric acid creates new substances, making it a chemical change.
