Objectives (5 - 7 minutes)

1. Understand the concept of the Nernst equation and its application in electrochemistry.

2. Interpret and calculate the electromotive force of an electrochemical cell using the Nernst equation.

3. Apply the acquired knowledge to solve practical problems involving the Nernst equation and the electromotive force.

Secondary objectives:

• Identify the components of an electrochemical cell and how they influence the electromotive force.

• Relate the Nernst equation to the law of mass action and the equilibrium constant.

• Apply the acquired knowledge to predict the direction of an electrochemical reaction based on temperature variation or concentration.

In this stage, the teacher should clearly present the lesson objectives, explaining the importance of each one and how they relate to the general topic of electrochemistry. Additionally, the teacher should encourage students to ask questions and express their expectations regarding what they will learn.

Introduction (10 - 15 minutes)

1. Review of previous concepts:

   • The teacher should start the lesson by reviewing basic concepts of electrochemistry, such as the definition of an electrochemical cell, electrode potential, potential difference, among others. This is essential for students to deeply understand the concept of the Nernst equation. (3 - 5 minutes)

2. Problem-solving situations:

   • The teacher should present two problem-solving situations to stimulate students' critical thinking. The first one could be: 'How can we calculate the electromotive force of an electrochemical cell operating under non-standard conditions, such as temperature variation or concentration of reactants?' The second one could be: 'How can the variation in ion concentration in an electrochemical cell influence the direction and speed of a reaction?' (3 - 5 minutes)

3. Contextualization:

   • The teacher should then contextualize the importance of the subject, showing how the Nernst equation is applied in various areas, such as in energy production in batteries and in human physiology, where the Nernst equation is used to determine the equilibrium potential of ions in cell membranes. (2 - 3 minutes)

4. Introduction to the topic:

   • Finally, the teacher should introduce the topic in an interesting way, recounting the history behind the discovery of the Nernst equation. The teacher can mention that Walther Nernst, a famous German chemist, developed the Nernst equation in the early 20th century, and that this equation was crucial for significant advances in electrochemistry. (2 - 3 minutes)

In this stage, it is crucial for the teacher to keep the students' attention, using clear and accessible language, and encouraging active participation through questions and discussions.

Development (20 - 25 minutes)

1. 'Daniell Cell' Experiment:

   • The teacher should organize students into groups and provide them with the necessary materials to assemble a 'Daniell Cell,' which is a simple electrochemical cell widely used in didactic experiments.
   • The teacher should guide the students to correctly assemble the electrochemical cell, with a copper electrode in a copper sulfate solution and a zinc electrode in a zinc sulfate solution.
   • After assembly, students should measure the potential difference between the electrodes with a voltmeter.
   • The teacher should then instruct the students to vary the concentration of the solutions and the temperature, and measure the potential difference again.
   • With the obtained data, students should calculate the electromotive force of the electrochemical cell using the Nernst equation.
   • At the end of the experiment, students should discuss the observed variations and how they relate to the Nernst equation. (10 - 12 minutes)

2. 'Electrochemistry Problems' Activity:

   • The teacher should provide students with a list of electrochemistry problems involving the Nernst equation.
   • The problems should vary in difficulty and complexity, allowing students to apply the acquired knowledge progressively.
   • Students should work in groups to solve the problems, with the guidance and support of the teacher.
   • After a set time, each group should present the solution to a problem to the class, explaining step by step how they arrived at the result.
   • The teacher should then provide feedback and clarify any doubts that may arise. (8 - 10 minutes)

3. Classroom Discussion:

   • After completing the activities, the teacher should lead a classroom discussion, questioning students about their observations and conclusions.
   • The teacher should also make connections between the activities and the theory, reinforcing the concepts of electrochemistry and the application of the Nernst equation.
   • This discussion serves to consolidate learning and clarify any remaining doubts. (2 - 3 minutes)

In this stage, it is essential for the teacher to circulate around the classroom, supervising students' activities, clarifying doubts, and encouraging the participation of everyone. Additionally, the teacher should ensure that students are using the correct language and understanding the fundamental concepts.

Return (8 - 10 minutes)

1. Group Discussion:

   • The teacher should gather all students and open a general discussion about the solutions or conclusions found by each group during the practical and problem-solving activities.
   • Each group will have the opportunity to share their findings and explain how they applied the theory of the Nernst equation to solve the proposed problems.
   • During the discussion, the teacher should encourage the exchange of ideas among students, asking them what they think of the solutions proposed by other groups, whether they agree or disagree, and why.
   • This stage is important for students to learn not only from their own experiences but also from the experiences of others, as well as to promote the development of critical thinking and argumentation skills. (3 - 4 minutes)

2. Connection to Theory:

   • The teacher should then make the connection between the practical activities and the theory presented at the beginning of the lesson.
   • The teacher should remind students of the concept of the Nernst equation and how it is used to calculate the electromotive force in an electrochemical cell.
   • The teacher should then show how the results obtained in the practical activities confirm the theory and how the theory can be applied to solve practical problems.
   • This stage is fundamental for students to consolidate learning, understanding the relevance of the theory and its application in practice. (2 - 3 minutes)

3. Individual Reflection:

   • Finally, the teacher should propose that students reflect individually for a minute on what they learned in the lesson.
   • The teacher should ask 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 today in real situations?'
   • After reflection, the teacher can ask some students to share their answers with the class.
   • This stage is crucial for students to internalize learning, identify possible gaps in their understanding, and plan the next steps to consolidate the acquired knowledge. (1 - 2 minutes)

In this stage, the teacher should be attentive to clarify any doubts that may arise, ensure that all students have understood the presented concepts, and encourage reflection and critical thinking. Additionally, it is important for the teacher to provide constructive feedback to students, recognizing their efforts and pointing out areas that need improvement.

Conclusion (5 - 7 minutes)

1. Summary of Contents:

   • The teacher should start the Conclusion of the lesson by briefly summarizing the covered contents. Should recall the definition of the Nernst equation, its application in electrochemistry, and how it is used to calculate the electromotive force of an electrochemical cell. (1 - 2 minutes)

2. Connection between Theory and Practice:

   • Next, the teacher should emphasize the importance of the connection between theory and practice. Should highlight how the practical activities carried out during the lesson helped to illustrate and apply the presented theoretical concepts. (1 - 2 minutes)

3. Extra Materials:

   • The teacher should then suggest extra materials for students who wish to deepen their knowledge on the topic. These materials may include books, articles, videos, and websites that explain in more detail the Nernst equation and electrochemistry. (1 - 2 minutes)

4. Relevance of the Topic:

   • Finally, the teacher should briefly explain the relevance of the topic for daily life and other disciplines. Can mention, for example, how the Nernst equation is used in energy production in batteries or in human physiology.
   • Additionally, the teacher can highlight how the ability to solve electrochemistry problems, developed during the lesson, is important for solving problems in other areas of science and technology. (1 - 2 minutes)

In this stage, the teacher should ensure that students have understood the main concepts of the lesson and feel motivated to continue learning about the topic. Additionally, it is important for the teacher to provide a welcoming and supportive environment where students feel comfortable expressing their doubts and difficulties, and exploring new knowledge and skills.