Contextualization

The study of Oxidation Number, also known as Nox, is fundamental in the process of learning Chemistry, being a central concept that helps to understand various chemical reactions, such as oxidation and reduction reactions, chemical equilibrium, and much more. In a simplified way, Nox can be understood as the number of charges that an atom would have in a molecule if all the electrons were assigned to the most electronegative atom.

In this sense, a good chemist should be able not only to understand what Nox is, but also to calculate this value, which is one of the main focuses of our project. Throughout it, we will delve deeply into this concept, exploring its theory, application in everyday situations, and also how to calculate this value. Furthermore, we will also discuss the connection between this concept and the electronegativity of chemical elements, in order to provide a broader and more complete view.

Importance of Nox

The importance of Nox goes far beyond classrooms and chemistry laboratories. It is present in our lives in ways that we often do not even realize. By predicting the behavior of chemical reactions, Nox allows chemists to develop new products and medications, contributing to advances in areas such as the pharmaceutical industry, agriculture, and technology.

Furthermore, understanding Nox is essential for comprehending vital natural processes, such as photosynthesis and cellular respiration. In this way, in addition to expanding our understanding of the world around us, this concept also enables us to develop more efficient and sustainable solutions for current challenges, such as energy issues and the reduction of greenhouse gas emissions.

LINKS INDICATED FOR READING AND DEBATE:

• [What is Nox and how to calculate | Mundo Educação.] (http://mundoeducacao.uol.com.br/quimica/o-que-e-como-calcular-o-nox.htm)
• [Nox (oxidation number) | Chemistry | Khan Academy.] (https://pt.khanacademy.org/science/chemistry/chemical-reactions-stoichiome/redox/v/introduction-to-oxidation-reduction-redox-reactions)
• [The importance of chemistry for society | Brasil Escola.] (https://brasilescola.uol.com.br/quimica/a-importancia-quimica-para-sociedade.htm)

Practical Activity

Activity Title: "Oxidation in Action: Understanding and Calculating Nox"

Project Objective:

The objective of this project is to provide students with the opportunity to investigate in practice the concept of oxidation number (Nox), through the execution of experiments, group discussions, and theoretical research.

Detailed Project Description:

Students will be divided into groups of 3 to 5 members and must select different chemical reactions (minimum of four reactions), including some that occur in our daily lives, to study the application of Nox. Additionally, they will explore the relationship between Nox and electronegativity, in order to understand how this concept is applied and how it can be used to predict the behavior of different chemical reactions. Furthermore, they should also explore and discuss the importance of Nox in the world outside the laboratory, in areas such as the pharmaceutical industry, agriculture, and technology.

Each group must research the chosen chemical reactions and prepare a presentation for the class, explaining the theory behind Nox and how it applies to each reaction, as well as the methodology used to calculate Nox in the various reactions.

Students should also prepare a detailed report describing the process and results of their project.

Required Materials:

• Chemistry books and articles
• Internet access for research and presentations
• Whiteboard and markers for presentations
• Laboratory materials, if available and safe for conducting experiments.

Detailed Step-by-Step for Activity Execution:

1. Divide students into groups of 3 to 5 members.
2. Each group selects at least four different chemical reactions for the study of Nox.
3. Students conduct in-depth research on the application of Nox in the selected chemical reactions.
4. Each group prepares an oral presentation for the class, explaining the theory of Nox, electronegativity, and how it applies to the chosen reactions.
5. During the presentation, students should explain the methodology used to calculate Nox in each case.
6. Each group should discuss the importance of Nox in practical applications beyond the laboratory.
7. After presenting, each group should prepare a detailed report on the project, including an introduction, a description of the project's development, the conclusions obtained, and the bibliography used.

Project Deliverables and their Relationship with the Proposed Activities:

After completing the activities, the groups must produce two main deliverables:

1. Oral Presentation: The presentation should cover the theory of Nox and electronegativity, the description of the selected chemical reactions, the explanation of Nox calculation in each reaction, and the discussion of the importance of Nox in practical applications. This presentation is the culmination of the research and discussion carried out by the groups and allows students to present their findings and understandings in a collaborative manner.

2. Written Report: The report should follow the previously indicated format, containing an introduction to the topic, a description of the project's development, the conclusions obtained, and the bibliography used. The report is an opportunity for students to compile the work done, demonstrating their understanding of the topic and the skills acquired throughout the project. Additionally, it also allows for reflection on the learning achieved, contributing to the consolidation of acquired knowledge.