Will says some changes caused by heating cannot be reversed. Angelo says some changes can be reversed.

Their father takes a popsicle out of the freezer and sets it on the counter. The popsicle begins to melt. He gets a call and puts it back into the freezer.

Using this example who is correct, Will or Angelo, and why?

An example of a change caused by heating or cooling that can be reversed would be the melting of a candy bar and then putting it into the refrigerator to reset the chocolate.

Which material can be heated or cooled, and then have the changes reversed?

Becca says that some heating changes can be reversed. She gives the example of melting butter. She says that you can turn a solid piece of butter into a liquid and then turn it back to a solid. Her friend Melva disagrees and says butter cannot be changed back and forth.

Who is correct, and why?

Which photo represents a heating or cooling change that can be reversed?

An example of a change caused by heating or cooling that can be reversed would be the melting of a crayon and then freezing it back into a solid cube.

An example of a change caused by heating or cooling that can be reversed would be the baking of a birthday cake.

Which material can be heated or cooled, and then have the changes reversed?

Which photo represents a heating or cooling change that can be reversed?

This photo represents a change due to heating or cooling that can be reversed.