Extras

    Video thumbnail: Science Trek Compounds:  Can a chemical change be reversed?

    Science Trek

    Compounds: Can a chemical change be reversed?

    Can a chemical change be reversed?

    Compounds: Can a chemical change be reversed?

    Video thumbnail: Science Trek Compounds: Famous Chemists

    Science Trek

    Compounds: Famous Chemists

    Who are chemistry's rockstars?

    Compounds: Famous Chemists