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Single replacement reactions occur when a compound substance reacts with a simple substance and generates two other simple and compound substances. In double replacement reactions, two compound substances react to produce two more. Learn more with this class by Prof. Eduardo. OUR WEBSITE: http://www.AulaDe.com.br FACEBOOK: http://www.Facebook.com.br/AulaDeOnline TWITTER: http://www.Twitter.com.br/AulaDeOnline INSTAGRAM: / auladeonline GOOGLE+: https://plus.google.com/+AuladeBr/