By Laurie Jarvis
By Deb Simonson
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it doesn't let me see all of the "both chemical and physical changes". what do i do?
Thanks for reporting this. It has been fixed.
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 animated object, learners examine how the heating or cooling steps in a manufacturing process work to control a chemical reaction.
Students read an explanation of chemical formulas in this animated activity. A quiz completes the object.