In this animated object, learners examine how changes in pH affect the salt bonds in strands of hair.

In this screencast, learners examine the properties of the peptide bond and how the bond relates to the structure of hair.

In this animated lesson, learners read about the disulfide bond, the second strongest chemical bond in the hair. This bond can only be altered by chemicals.

In this interactive object, students examine a type of chemical bond known as the "hydrogen bond."

In this screencast, learners examine the properties of the hydrogen bond and how the bond changes when hair is shampooed or styled.