Question

Which change is the best example of a physical change?

1) a cookie baking
2) a paper burning
3) ice cream melting
4) a nail rusting

I need help on this FAST, thx!

Answer 1

A physical change would be 3) ice cream melting. 1) and 2) are combustion reactions, which are chemical with oxygen, and 4) is an oxidation reaction, also with oxygen. A phase change, or melting, is not a chemical change but a physical one. Therefore 3) ice cream melting is the answer

Answer 2

A physical change does not change the bonds and it changes the state of the substance. 

A cookie baking is wrong because we cannot change it back to dough after it bakes. 

A paper burning is wrong also. Burning is a chemical change.

Ice cream melting can always be frozen back again, so that is correct!

A nail rushing is a chemical change, so it is wrong.

Final answer:- 3) ice cream melting