"Chemical Reaction" is a song by German singer Sasha. It was written by Sasha, Pete Boyd Smith, Michael Kersting, and Stephan Baader [citation needed] for Sasha's second studio album ...you (2000), while production was overseen by the latter two. Released as the album's second single, it reached number seven in the Flemish portion of Belgium and the top 40 in Austria, Germany and Switzerland.