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Classwork Chemical or Physical Questions
1) A hot dog is cooked
·Chemical or physical change? Answer may vary, depending on whether the student is used to boiling or grilling a hot dog. However, cooking is generally thought of as being a chemical change.
·Your reason: The properties of the hot dog (consistency, taste, etc) are different after cooking than before, suggesting that drastic changes have been made.
2) Thousand Island dressing and mayonnaise are mixed to make “secret sauce” for hamburgers
Physical change
·Your reason: Mixing things doesn’t break or make chemical bonds
3) Water is boiled in preparation for making pasta
Physical change
·Your reason: The process of boiling doesn’t break the bonds in water molecules (breaking the hydrogen bonds between molecules doesn’t count)
4) Old ham goes bad in the refrigerator
Chemical change.
·Your reason: From the wide variety of properties that change, it can be inferred that the chemical structure of the ham has been changed.
5) A rock star gets a tattoo on his forehead
Physical change
Your reason: The dye in tattooing ink doesn’t formally bond to the skin.
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