2 - PS1.B - Changes from Heat - FINAL (WND 3/10/2014)

Module: Changes from Temperature

DCI: PS1.B Chemical Reactions – Heating or cooling a substance may cause changes that can be observed. Sometimes these changes are reversible, and sometimes they are not.

PE: 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.]

The ideas in this standard are: 

- heating a substance may cause changes that can be observed

- cooling a substance may cause changes that can be observed

- sometimes these changes are reversible

- sometimes these changes are not reversible

We will have to provide evidence (scenarios, data, etc.) and have students tell us which of the observations are related to heating or cooling a substance, and we can have them tell us whether something is a reversible change or not.  This sets the stage for the understanding that heat can cause both physical changes and chemical changes. 

Possible Question Starters:
"A student leaves an ice cube outside on a sunny day.  After a few minutes, the ice cube melts. This change is caused by - ?"

correct answer - heat

incorrect answers - wind, grass, rain