Colorado Cosmetology Written Practice Exam

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By what means can hydrogen bonds in hair be broken?

  1. Chemicals

  2. Cool air

  3. Heat or water

  4. Light

The correct answer is: Chemicals

Hydrogen bonds in hair can be broken by using chemicals such as hair dye or hair straighteners. Cool air, heat or water, and light may affect the appearance or texture of hair, but they do not directly break hydrogen bonds.

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