Mississippi Science P.2.5.4
The Standard
- P.2.5
- Students will demonstrate an understanding of the properties of matter.
Construct scientific arguments to support claims that some changes to matter caused by heating can be reversed, and some changes cannot be reversed.
2026 Mississippi College- and Career-Readiness Standards for Science · Organization of Matter and Chemical Interactions
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students observe what happens when chocolate melts and cools, and when bread is toasted and cools. They make a claim about which change can be undone and use observations to support it.
What Mastery Looks Like
- A student explains that melted chocolate becomes solid again when cooled, even if its shape changes. They point out that toast stays brown and crisp after cooling, so it cannot become plain bread again.
Common Misconceptions
- Students may think cooling undoes every change caused by heating. They may also think melted chocolate cannot change back because it hardens in a different shape.
How to Assess It
- Show pictures of chocolate melting then hardening, and bread browning then cooling. Ask: "Which change can be undone? What do you see that supports your answer about each one?"
Lesson moves
Ways to Teach It
Place sealed bags of chocolate in teacher-prepared warm water, then ice water, and have students record what happens in each bath.
Show plain bread and toast, then ask: "Can cooling turn toast back into plain bread? What do you notice?"
Give pairs picture cards of melted butter, cooled butter, cookie dough, and baked cookies to sort by whether heating can be undone.
Show a melted ice pop and a slice of toast, then ask which a freezer could return to a solid and which would stay changed.
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Printable P.2.5.4 Worksheet
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