Summary
Uses a picnic-gone-wrong as the anchor to teach physical vs. chemical changes — what distinguishes mixing ingredients from actually creating a new substance — with clear, food-based examples students can relate to.
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All ages
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Teaching resources
Discussion questions
Discussion
- What is a physical change? Give one example from your lunch.
- What is a chemical change? How do you know one has happened?
- Is dissolving sugar in water a physical or chemical change? How would you check?
- Can a chemical change ever be reversed? Give an example or a counterexample.
Quick work-a-long
Vocabulary: physical change, chemical change, reversible, evidence, substance, reaction.
Try it: Mix baking soda and vinegar in a cup. Observe and list evidence that a chemical change occurred (bubbles, temperature change, new substance formed). Is this reversible? How do you know?