Contextualization

Chemical reactions are processes that transform one or more substances, called reactants, into other substances, which we call products. These transformations take place through rearrangements of the atoms present in the reactants, which form new bonds and, consequently, new substances. In the field of Organic Chemistry, substitution reactions are some of the most common and important reactions to be known and understood.

Substitution reactions occur when an atom or group of atoms in an organic molecule is replaced by another atom or group of atoms. This process is fundamental in the formation of new substances and it is one of the pillars of the chemical industry, being widely used in the production of medicines, plastics, dyes, among others.

Studying substitution reactions is essential for understanding the logic behind the microscopic and invisible world that is present in our daily lives. The perfume we use, the detergent we use to clean the house, the plastic that packages our food, all of these are the result of chemical processes, many of them involving substitution reactions.

In general terms, substitution reactions help us understand how to manipulate the structure of molecules, allowing us to create new substances with desired properties. They are a powerful tool in the hands of chemists and, consequently, in our society, since they allow the creation of an infinite number of products that we use in our daily lives.

Here are some reliable resources, in Portuguese, that can help you explore the topic further:

• Khan Academy - Substitution Reactions
• Book "Organic Chemistry", by John McMurry. Editora Cengage Learning.
• Portal da Educação - Substitution Reactions in Organic Compounds

Practical Activity

Activity Title: "Substitution Pathways: A Journey into Chemical Reactions"

Project Goal

To understand substitution reactions in organic compounds by conducting practical experiments, researching synthetic routes, applying theoretical concepts, and analyzing the results.

Detailed Description of the Project

Students will be divided into groups of 3 to 5 members and will have the task of using simple and easy-to-obtain materials to conduct one or more experiments that demonstrate the principles of substitution reactions in organic compounds. At the same time, students should research the synthetic routes that involve substitution reactions and understand how these reactions occur in theory and in practice.

Required Materials

1. Simple organic compounds (e.g.: ethanol, acetic acid).
2. Catalysts (e.g.: sulfuric acid).
3. Basic chemistry equipment (test tubes, scales, distilled water).

Note: The required materials may vary depending on the experiments chosen by the students. Teachers should ensure that all experiments are safe and possible to perform under the available conditions.

Detailed Step-by-Step Guide for Completing the Activity

1. Research and Planning: Research the principles of substitution reactions and choose one or more experiments to demonstrate them. Plan the execution of the experiments, identifying the necessary materials and the safety measures to be taken.

2. Conducting the Experiments: Conduct the experiments as planned, recording all observations and results.

3. Analysis and Interpretation: Analyze the results obtained, interpreting them in light of the theory of substitution reactions. Make the connection between what you observed in practice and what you studied in theory.

4. Final Report: Write a detailed report containing the description of the experiment(s) performed, the results obtained, and the analysis thereof. The report should also contain a theoretical part where you explain the principles of substitution reactions and describe the synthetic routes researched.

Project Deliverables

Students should submit a report in the format of a scientific article containing:

1. Introduction: Contextualize the topic, explaining the relevance of substitution reactions and the objective of the work.

2. Development: Describe the experiments performed, explaining step by step how they were done, and present the results obtained. Also explain the theoretical principles of substitution reactions and describe the synthetic routes researched.

3. Conclusion: Conclude the work by reviewing the main points, explaining what was learned by carrying out the project, and interpreting the results obtained.

4. Bibliography: List the sources used to develop the project.

Remember: the written document should not only report the experiments performed, but also reflect a deep understanding of the theory behind the substitution reactions. In addition, teamwork, effective communication, and efficient time management will be considered in the final evaluation of the project.