This common liquid expands as it freezes, helping its solid form float.

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Water: Molecule made of two hydrogen atoms and one oxygen atom. Source: Water ↗

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19These cleaning agents have molecules with both water-attracting and oil-attracting parts.IDENTIFY
Soap and Surfactants
Surfactant molecules in soap attract both water and oil, letting dish soap lift grease off a plate.
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20These large molecules consist of repeating smaller units called monomers.RECALL
Polymers
Polymers are large molecules built from repeating smaller units called monomers, as in plastic bottles.
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21This familiar seasoning is sodium chloride, a compound of two highly reactive elements.RECALL
Table Salt
Table salt forms when the reactive metal sodium combines safely with the toxic gas chlorine.
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