In short a physical change is something that changed the way something looks but doesn't affect the chemical makeup. Drying your hair doesn't change the color of your hair, it just makes it dry so thats a physical change. Rust forming on a knife is a chemical change becaause the water reacts with the chemical makeup of the knife. Hope that helps.
Do you really feel fly in true religion
The answer is 1s2 2s2 2p6
A Polar Covalent Bond!! Hope this helps!!
What am I suppose to do???