Summary
Sid notices that Grandma's pancakes come out perfect every time and wonders how heat changes the batter. At school, he and his classmates test what heat does to different foods and discover that cooking can permanently change a material — you can't "uncook" a pancake.
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Teaching resources
Discussion questions
Discussion
Sid discovers that some changes caused by heat can't be undone — a cooked pancake can't go back to batter.
- What did Sid notice was different about the batter before and after cooking?
- Can you think of another food that changes permanently when heated? What about one that changes back when cooled?
- Why do you think it matters whether a change is reversible or not?
Quick work-a-long
Vocabulary: heat, change, reversible, irreversible, material.
Try it: Think of two examples: one material that can change back (like ice → water → ice) and one that can't (like raw → cooked egg). Draw each and label it reversible or irreversible.