2-PS1-4

SCUSD NGSS Curriculum Guide ====** 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.] ====

Science Background for the Teacher:
Temperature should be identified as hot, warm, or cold. Solids and liquids should be introduced. The process of changing matter should not be described as "hot, warm, cold" but as heating and cooling where heating and cooling are used as verbs. Heat and cold should **not** be used as nouns.

Key Vocabulary:

 * [key vocab term for this performance expectation] || [key vocab term for this performance expectation] || [key vocab term for this performance expectation] || [key vocab term for this performance expectation] ||
 * irreversible || reversible || freezing || melting ||
 * heating || cooling || temperature ||  ||

Possible Assessments (formative and/or summative):
If, then __. Statements with sentence frames provided.

Construct a list of reversible and irreversible changes and have students separate them into their proper categories (ex. irreversible: you can't unbake a cake, reversible: you can make water back into an ice cube).

Key Student Activities:
Watch an ice cube melt and then freeze it again. (reversible) Popcorn popping. (irreversible) Baking (irreversible) Hard boiled egg (irreversible) Softening and hardening of butter or chocolate (reversible)

Key Teacher Demos/Activities:
[Description of teacher demo or activity. Include necessary materials, if known.]

Common Student Misconceptions:
It is a common misconception that "heat" and "cold" are "stuff." They should not be used as nouns but as verbs (to heat, to cool). "Cooling" is the removal of energy.

Things to Avoid/Correct:
Avoid the cell phone popping popcorn video (the video is incorrect, it is showing the process in reverse/ movie magic).

====Other Resources (text, video, simulations, activities, models, etc..): ====

Videos of blowing glass. Videos of melting crayons (How It's Made)