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Get your questions answered here: http://kuadro.com.br/videoaula/quimic... Watch other chemistry video lessons: http://kuadro.com.br/quimica What are addition reactions? What is hydrogenation? In this video lesson we begin the study of addition reactions. We begin with the hydrogenation reactions of alkenes that result in the addition of hydrogen atoms to the organic molecule, breaking the double bond. These reactions are very important economically and are often tested in college entrance exams and ENEM. Study with Kuadro and get ready!