Think of a physical change like cutting a piece of paper. It’s still paper—just in smaller, sadder bits. You can tape it back together and it’s the same stuff. A chemical change, though? That’s a whole new identity.
When you toast bread, it’s a chemical change. You can’t “untoast” it. Burning wood? Chemical. Rust on a bike? Also chemical. These changes create new substances with new properties. And your runny egg? It’s signing up for the same club.
