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In a sodium stearate molecule, the part that dissolves in grease and oil is

  1. Athe long hydrocarbon chain
  2. Bthe carbonyl oxygen
  3. Cthe carboxylate group
  4. Dthe sodium ion

Answer: A

The tail is non-polar (hydrophobic) and therefore dissolves in oils and grease. The ionic head is polar (hydrophilic) and stays in water.
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