QUÍMICA ENEM 2018! "O manejo adequado do solo possibilita a manutenção de sua fertilidade..."

Hey everyone! In this video, we'll be solving question 121 of the 2018 ENEM chemistry exam (blue booklet)! Proper soil management allows for the maintenance of its fertility as the exchange of nutrients between organic matter, water, soil, and air is maintained to ensure production. Some ionic aluminum species are toxic, not only to the plant but also to many organisms such as the bacteria responsible for transformations in the nitrogen cycle. Aluminum damages the cell membranes of the roots and restricts the expansion of their walls, thus preventing the plant from growing properly. To promote benefits for agricultural production, soil remediation using limestone (CaCO3) is recommended. BRADY, N. C.; WEIL, R. R. Elements of nature and properties of soils. Porto Alegre: Bookman, 2013 (adapted). This remediation promotes in the soil the: a) decrease in pH, making it fertile. b) solubilization of aluminum, with its leaching occurring through rain. c) interaction of calcium ions with aluminum ions, producing a metallic alloy. d) reaction of calcium carbonate with aluminum ions, forming metallic aluminum. e) increase in its alkalinity, making aluminum ions less available. The Chemistry Room channel has content aimed at students who have a lot of difficulty with this subject! Simple, clear and easy-to-understand explanations! If CHEMISTRY is the terror of your studies, it's time to change that perception!!! Guys, don't forget to subscribe to the channel, leave a comment and like the videos, and share with friends who are "completely clueless" in chemistry! My goal is to bring free, quality basic content to students in Brazil! We're in this together!!!! Instagram: professordiegofares #enem #enem2018 #resolucaoenem