2-PS1-4. Construct an argument with evidence that some changes caused by heating or cooling can be reversed and some cannot. [Clarification Statement: Examples of reversible changes could include materials such as water and butter at different temperatures. Examples of irreversible changes could include cooking an egg, freezing a plant leaf, and heating paper.]
27 Slides - The majority of these slide are animated and show examples of water in various stages, other items that can melt and then solidify again and then a few examples of items that cannot be reversed.
Several questions posed to spark discussion and higher level thinking.