Objectives (5 - 7 minutes)

1. Understand the difference between physical and chemical phenomena: Students should be able to identify characteristics that distinguish physical phenomena from chemical phenomena. In addition, they should understand that while physical phenomena can change the appearance or state of a substance, they do not transform it into a new substance, unlike chemical phenomena.

2. Recognize examples of physical and chemical phenomena in everyday life: The goal is for students to be able to apply the concept learned to identify physical and chemical phenomena in real life situations. This will help to consolidate theoretical understanding and to perceive the importance of chemistry in our daily lives.

3. Develop observation and analysis skills: Throughout the lesson, students will be encouraged to observe, analyze and discuss various phenomena and situations to determine whether they are physical or chemical. This critical thinking process is essential for the study of chemistry and for the formation of critical and conscious citizens.

Secondary objectives:

• Stimulate scientific curiosity: Through experiments and problem situations, the lesson should arouse students' interest in chemistry and science in general. This can be done by showing how chemistry is present in various aspects of everyday life and how it can be fun and interesting.

• Promote active student participation: The lesson should be structured in such a way as to encourage active student participation, whether through group discussions, practical experiments or problem solving. This will not only make the lesson more engaging and meaningful, but will also help to develop communication and teamwork skills.

Introduction (10 - 15 minutes)

1. Content review (3 - 5 minutes): The teacher should begin the lesson by reviewing the basic concepts of matter, substances and changes of physical state. It is important for students to understand that in a physical phenomenon, the nature of the substance is not changed, while in a chemical phenomenon, a new substance is formed. This review can be done interactively, through questions and answers.

2. Problem situations (3 - 5 minutes): The teacher should present two problem situations that provoke students' thinking. For example: "What happens when we put an ice cube in the sun? What about when we put a piece of paper in a fire?" These situations should be used to introduce the concept of physical and chemical phenomena and to arouse students' curiosity.

3. Contextualization (2 - 3 minutes): The teacher should explain that the study of physical and chemical phenomena is essential to understand the functioning of various processes around us. For example, the change of physical state of water is a physical phenomenon that occurs in various everyday situations, such as when boiling water to make coffee. The burning of paper is an example of a chemical phenomenon that occurs when a substance reacts with oxygen in the air.

4. Gaining attention (2 - 4 minutes): To arouse students' interest, the teacher can share curiosities or stories related to the topic. For example, he can tell the story of the French chemist Antoine Lavoisier, considered the father of modern chemistry, who conducted various experiments to understand the nature of chemical phenomena. Another curiosity is that many natural phenomena, such as photosynthesis in plants, are in fact complex chemical processes.

Development (20 - 25 minutes)

1. Classification Activity (10 - 12 minutes): The teacher should prepare a series of cards with different phenomena described or illustrated. These may include phenomena such as the dissolution of salt in water, burning a candle, evaporation of water from a glass, melting of an ice cube, and so on. Students, in groups of 3 to 4, will receive the cards and the task of classifying the phenomena as "Physical" or "Chemical". This activity promotes teamwork, discussion among students and the practical application of the concept learned.

   • Preparation: The teacher should prepare the cards in advance and ensure that there is a mixture of physical and chemical phenomena. In addition, it is important that the cards are clear and understandable to students.

   • Implementation: The teacher should divide the class into groups and distribute the cards. Students should discuss among themselves and classify the phenomena. After a set time, each group should present their classifications to the class, explaining the reason for their choices. The teacher should provide feedback and clarify any questions that may arise.

2. Practical Experiment (10 - 12 minutes): The teacher should conduct a simple experiment to demonstrate the difference between a physical phenomenon and a chemical phenomenon. For example, he can mix baking soda and vinegar in a balloon, observing the chemical reaction that occurs and the balloon inflating. The teacher can then demonstrate a physical phenomenon, such as a change in the physical state of water, by heating a glass of water and observing the formation of steam.

   • Preparation: The teacher should prepare the necessary materials for the experiment in advance and ensure that all steps are followed correctly.

   • Implementation: The teacher should conduct the experiment in front of the class, explaining each step and asking questions to check students' understanding. It is important that students are involved in the experiment, observing carefully and taking notes. After the completion of the experiment, the teacher should summarize the observations and relate them to the concept of physical and chemical phenomena.

3. Discussion and Synthesis (5 - 7 minutes): After the classification activity and the experiment, the teacher should promote a classroom discussion to consolidate learning. He can ask questions such as: "Which phenomena were the most difficult to classify?" or "What did you learn from the experiment?" The goal is for students to reflect on what they have learned and to apply the concept of physical and chemical phenomena to different situations. The teacher should encourage all students to participate in the discussion and to share their ideas.

Feedback (8 - 10 minutes)

1. Group Discussion (3 - 4 minutes): The teacher should promote a group discussion, where each team will share their answers and conclusions from the activities performed. Each group will have a maximum of 3 minutes to present, in order to ensure that everyone participates. During the presentations, the teacher should encourage questions and comments from other students, thus promoting a collaborative learning environment.

   • Preparation: The teacher should organize the groups and define the rules for the presentation. He should also prepare some guiding questions to ensure that the main points are covered by all groups.

   • Implementation: The teacher should give the floor to each group in the established order, ensuring that everyone has the chance to share their ideas. During the presentations, the teacher should ask questions to stimulate critical thinking and deepen students' understanding.

2. Connection with Theory (2 - 3 minutes): After the presentations, the teacher should briefly review the theoretical concepts discussed at the beginning of the class and how they connect to the practical activities carried out. He can, for example, highlight how the observation of physical and chemical phenomena in the practical experiment confirmed the theory presented. This step is important to consolidate learning and clarify any doubts that may still exist.

   • Preparation: The teacher should briefly review the theoretical concepts and prepare some questions to check students' understanding.

   • Implementation: The teacher should explain the connection between theory and practice, using concrete examples. He should also ask questions to check students' understanding and clarify any doubts that may arise.

3. Final Reflection (2 - 3 minutes): To conclude the lesson, the teacher should propose that students reflect individually on what they have learned. He can ask questions such as: "What was the most important concept learned today?" and "What questions have not yet been answered?" Students will have a minute to think and then will be invited to share their answers with the class, if they wish.

   • Preparation: The teacher should prepare the reflection questions and ensure that there is enough time for all students to share their answers, if they wish.

   • Implementation: The teacher should propose the reflection questions and give a minute for students to think. He should then invite those who wish to share their answers with the class. The teacher should listen attentively to students' answers and encourage them to ask questions and express their doubts, if any.

4. Teacher Feedback (1 minute): Finally, the teacher should provide feedback on the lesson, highlighting the strengths and pointing out areas that may need more study. He can also suggest additional resources for students who wish to deepen their knowledge of the subject.

   • Preparation: The teacher should prepare the feedback in advance, focusing on the main learning points and areas that need reinforcement.

   • Implementation: The teacher should provide the feedback constructively, praising students' efforts and pointing out ways to improve. He should also answer any questions or doubts that students may have.

Conclusion (5 - 7 minutes)

1. Lesson Summary (2 - 3 minutes): The teacher should summarize the main points covered during the lesson. This includes the definition of physical and chemical phenomena, the difference between them and examples of each. The teacher can reinforce these concepts through questions and answers, ensuring that students have understood.

   • Preparation: The teacher should prepare a summary in advance, highlighting the key points of the lesson.

   • Implementation: The teacher should make the summary, making sure that all students are attentive and understanding. He should answer any questions that may arise during this review.

2. Connection of Theory with Practice (1 - 2 minutes): The teacher should explain how the lesson connected the theory, practice and application of the concepts. He can, for example, mention how the classification activity and the practical experiment allowed students to apply the concept of physical and chemical phenomena to real life situations.

   • Preparation: The teacher should prepare a clear and concise explanation of the connection between theory and practice.

   • Implementation: The teacher should present the explanation, ensuring that all students understand the importance of this connection.

3. Extra Materials (1 minute): The teacher should suggest additional study materials for students who wish to deepen their understanding of the topic. This may include videos, books, chemistry websites and learning apps.

   • Preparation: The teacher should prepare a list of recommended resources in advance.

   • Implementation: The teacher should share the list of resources with students, encouraging them to explore them in their own time.

4. Relevance of the Subject (1 - 2 minutes): In conclusion, the teacher should emphasize the importance of physical and chemical phenomena in everyday life. He can, for example, mention how understanding these phenomena is fundamental for various areas, such as cooking, medicine and engineering.

   • Preparation: The teacher should prepare some concrete examples that illustrate the importance of physical and chemical phenomena.

   • Implementation: The teacher should present the examples and explain how they relate to the lesson topic. He should encourage students to think of other examples and to share them with the class.