Objectives (5 - 7 minutes)

1. Understanding Organic Chemistry: The main objective is for students to develop a basic understanding of the concepts and applications of organic chemistry. This includes identifying the different chemical elements and their bonds, as well as studying the properties and behaviors of organic compounds.

2. Learning to Solve Minimum Formula Problems: The secondary focus is for students to become familiar with solving minimum formula problems. They should be able to apply the knowledge acquired about the structure of organic compounds to determine their minimum formula.

3. Developing Critical Thinking and Problem-Solving Skills: In addition to the specific content of the discipline, the lesson also aims to promote the development of critical thinking and problem-solving skills. Students should be able to analyze information, formulate hypotheses, and arrive at logical and well-founded conclusions.

Secondary Objectives:

• Encouraging Active Participation: The lesson should also promote an environment conducive to active student participation, encouraging discussion and sharing of ideas.

• Stimulating Autonomy in Learning: The teacher should encourage students to become autonomous in their own learning, promoting research and independent study.

Introduction (10 - 15 minutes)

1. Review of Previous Concepts: The teacher should start the lesson by briefly reviewing the concepts of chemical bonding, atomic and molecular structure, and the difference between organic and inorganic compounds. This is essential for students to understand the new concepts that will be introduced. (3 - 5 minutes)

2. Problem-Solving Situations: Next, the teacher should present two problem-solving situations that will be the starting point for the theory. For example:

   • "If we have an organic compound that contains carbon, hydrogen, and oxygen, how can we determine the minimum formula of this compound?"
   • "If we know that a compound contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen, how can we determine its minimum formula?" (3 - 5 minutes)

3. Contextualization of the Subject: Next, the teacher should contextualize the importance of the subject, exemplifying how determining the minimum formula is crucial in various practical applications, such as in the pharmaceutical industry, food production, and the manufacturing of plastics and other materials. (2 - 3 minutes)

4. Introduction to the Topic: To draw students' attention to the theme, the teacher can present some curiosities and applications of organic chemistry, such as:

   • "Did you know that organic chemistry is the basis for life as we know it? All living organisms are composed of organic molecules."
   • "Organic chemistry is also present in various aspects of our daily lives, from the medications we take to the plastics we use." (2 - 3 minutes)

5. Engaging Students' Attention: To spark students' interest, the teacher can share some curiosities and stories related to the subject, for example:

   • "Did you know that organic chemistry was originally defined as the chemistry of compounds extracted from living organisms, but now includes a wide variety of carbon-containing compounds?"
   • "And here's an interesting fact: diamond and graphite, although they look very different, are actually both carbon compounds and therefore classified as organic compounds!" (2 - 3 minutes)

Development (20 - 25 minutes)

1. Practical Activity of Molecular Modeling (10 - 12 minutes): The teacher should divide the class into groups of up to 4 students. Each group will receive a molecular modeling kit containing carbon, hydrogen, and oxygen atoms. The teacher should then propose the following challenge:

   • "You have received the atoms needed to form a molecule. The challenge is to create a molecule that contains carbon, hydrogen, and oxygen, and whose minimum formula is CxHyOz. You must determine the values of x, y, and z and build the corresponding molecule."
   • "After all groups finish, each one must present their molecule to the class and explain how they arrived at the minimum formula."

2. Problem-Solving Activity (10 - 12 minutes): After the modeling activity, the teacher should provide students with a series of minimum formula problems to be solved individually or in pairs. The problems should vary in difficulty, allowing students to gradually apply what they have learned. Some examples of problems may include:

   • "Determine the minimum formula of the compound that contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen."
   • "Determine the minimum formula of the compound that contains 20 carbon atoms, 42 hydrogen atoms, and 10 oxygen atoms."
   • "Determine the minimum formula of the compound that contains 6.022 x 10^23 carbon atoms, 1.008 g of hydrogen, and 16 g of oxygen."

3. Group Discussion (5 - 7 minutes): After solving the problems, the teacher should lead a group discussion to clarify doubts and reinforce the concepts. Students should be encouraged to explain their answers and how they arrived at them. The teacher should also highlight common errors and effective strategies for solving minimum formula problems.

4. Feedback and Problem Correction (3 - 5 minutes): Finally, the teacher should provide feedback to students on their answers and correct any errors. This is crucial to ensure that students fully understand the concepts and feel confident in their ability to solve minimum formula problems.

Return (8 - 10 minutes)

1. Group Discussion (3 - 4 minutes): The teacher should promote a group discussion where each team shares the solutions or conclusions found during the molecular modeling and problem-solving activities. Each group should have a maximum of 3 minutes to present, to ensure that there is enough time for everyone. The goal of this discussion is for students to learn from each other, see different approaches to the same problem, and reinforce the concepts that were learned.

2. Connection between Activities and Theory (2 - 3 minutes): After the presentations, the teacher should make the connection between the practical activities and the theory. He should explain how the activities performed demonstrate the practical application of the theoretical concepts discussed in the lesson. For example, the teacher can highlight how molecular modeling helped students visualize the structure of compounds and how solving minimum formula problems allowed them to apply these concepts in a practical way.

3. Individual Reflection (2 - 3 minutes): The teacher should then ask students to reflect individually on what they learned in the lesson. They should think about questions like:

   • "What was the most important concept you learned today?"
   • "What questions have not been answered yet?"
   • "How can you apply what you learned in real life?"

4. Student Feedback (1 minute): Finally, the teacher should ask students for feedback on the lesson. This can be done through a quick sentiment survey, where students are asked to evaluate their understanding of the topic, the difficulty of the activities, and the effectiveness of the lesson as a whole. Student feedback is extremely valuable to the teacher, as it allows him to adjust his teaching approach to meet the needs and expectations of the students.

Conclusion (5 - 7 minutes)

1. Summary of Contents (2 - 3 minutes): The teacher should start the Conclusion by summarizing the main points of the lesson. He should review the fundamental concepts of organic chemistry, the definition of minimum formula, and the step-by-step process for solving minimum formula problems. The teacher can also briefly revisit the answers or solutions from the practical activities, highlighting how these demonstrated the application of theoretical concepts.

2. Connection between Theory, Practice, and Applications (1 - 2 minutes): Next, the teacher should explain the importance of the interconnection between theory, practice, and applications. He should emphasize that organic chemistry is not just a set of abstract concepts, but rather a field of study with numerous practical applications. The teacher can use examples of real situations to illustrate this connection, such as the production of medications, plastics manufacturing, or forensic analysis.

3. Supplementary Materials (1 - 2 minutes): The teacher should then suggest some supplementary materials for students to deepen their knowledge on the subject. These materials may include reference books, educational websites, explanatory videos, or interactive chemistry games. The teacher should encourage students to explore these materials at their own pace, as part of their autonomous learning process.

4. Relevance of the Subject (1 minute): Finally, the teacher should reinforce the relevance of the subject to students' daily lives. He should explain that organic chemistry is present in many aspects of our daily lives, from the food we eat to the products we use in our homes. The teacher can use concrete examples to illustrate this importance, such as the importance of the minimum formula in food production, medications, or construction materials.

5. Encouragement for Continuous Learning (1 minute): Finally, the teacher should encourage students to continue learning about organic chemistry even after the end of the lesson. He should emphasize that organic chemistry is a vast and complex field, and that the knowledge gained in the lesson is just the beginning. The teacher should reinforce the importance of autonomous study and intellectual curiosity, and express his confidence that students have the ability to become true masters of organic chemistry.