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In a review class for the ENEM on equilibrium displacement, we will see fundamental concepts related to concentration, effects of common and non-common ions in chemical reactions. Equilibrium Displacement as a Function of Concentration: Understanding how small variations in the concentration of reactants impact the equilibrium state in chemical systems. Identification of the factors that influence the displacement of equilibrium, including Le Chatelier Common Ion Effect: Analysis of how the presence of similar ions can affect the equilibrium position in chemical reactions. Exploration of practical cases and situations in which the effect of the common ion is crucial to understanding changes in reactions. Non-Common Ion Effect: Understanding how the introduction of a non-participating ion can alter the proportions of reactants and products in a reaction at equilibrium. Practical examples that illustrate how the effect of the non-common ion influences the behavior of different chemical systems. In the class, students will be challenged to apply these concepts in practical contexts, developing a deep and practical understanding of these chemical phenomena. The goal is to prepare them not only to answer specific questions on the ENEM, but also to apply this knowledge in real-world situations.