Contextualization

Chemistry is a fundamental science that permeates all areas of our lives, from the biological processes that occur in our bodies to the technological advances that drive the modern world. In this project, we will delve into one of the most fascinating topics in chemistry: Batteries.

Batteries are devices that convert chemical energy into electrical energy through a process called redox reaction. They are composed of two main parts: the anode and the cathode. Oxidation, which is the loss of electrons, occurs at the anode, and reduction, which is the gain of electrons, occurs at the cathode. When we connect a device to a battery, such as a light bulb or a cell phone, electrons flow from the anode to the cathode, passing through the device, and this flow of electrons is what powers the device.

In our daily lives, we use batteries in numerous electronic devices, such as cell phones, laptops, cameras, watches, etc. Furthermore, batteries are also essential in more advanced applications, such as in space probes, electric cars, and even in pacemakers, which are devices implanted in the human body to regulate the heart rhythm.

Introduction

In this project, we will study in depth the functioning of batteries and carry out a practical activity to build and test several homemade batteries. We invite you to explore the wonderful world of chemistry and physics and to develop valuable skills, such as problem-solving abilities, creativity, and teamwork.

Suggested resources to delve deeper into the topic:

• Book "Chemistry: The Central Science" by Theodore L. Brown, H. Eugene LeMay, and Bruce E. Bursten.
• Khan Academy videos on the topic: Khan Academy
• Toda Matéria website, with articles on the topic: Toda Matéria

Practical Activity

Activity Title: Building and Testing Homemade Batteries

Project Objective

The objective of this project is to provide students with a deeper understanding of how batteries work, through the construction and testing of several homemade batteries. In addition, students will also learn about the importance of batteries in our lives, the various applications of batteries, and the environmental impacts caused by improper battery disposal.

Detailed Project Description

The groups, composed of 3 to 5 students, will delve into the theory behind the functioning of batteries, including the concepts of redox reactions, anode, cathode, and potential difference. They will research the various applications of batteries and the environmental impacts caused by improper battery disposal. Next, they will build and test several homemade batteries using different materials and analyze the results obtained.

Required Materials

• Various types of fruits and vegetables (such as lemons, potatoes, tomatoes)
• Zinc and copper (can be obtained from old coins or wires)
• Connection cables
• Multimeter
• LED bulb
• Paper, pencil, and ruler for notes and drawings
• Computer with internet access for research
• Reference books

Detailed Step-by-Step for Carrying Out the Activity

1. Start the project by researching and studying how batteries work, including the concepts of redox reactions, anode, cathode, and potential difference. Take notes on everything relevant to the project.

2. Research the various applications of batteries in our daily lives and technological advances. Additionally, investigate the environmental impacts caused by improper battery disposal.

3. Now, with the knowledge acquired about how batteries work, build several homemade batteries using different types of fruits and vegetables as electrolytes, and zinc and copper as electrodes.

4. Connect each battery to the multimeter and record the potential difference obtained. Take note of the results.

5. Connect each battery to an LED bulb and observe if it lights up. Record the results.

6. Compare the results obtained with the different batteries and try to explain what influenced the performance of each one.

Project Deliverables and How They Connect to the Suggested Activities

Students must deliver at the end of the project:

1. Written document: Students should write an analytical document in the form of a report on the entire process of building and testing the batteries, including the following main topics:

   • Introduction: Students should contextualize the topic of batteries, their relevance and real-world applications, and the objective of this project. Students should also explain the importance of the topic for society, citing examples from everyday life and the importance of sustainable use and proper battery disposal.

   • Development: Students should describe the theory behind the functioning of batteries, explain in detail how the batteries were built and tested, present and discuss the results obtained, and indicate the methodology used.

   • Conclusions: Students should conclude the work by summarizing their main points, explaining the learnings obtained, and drawing conclusions from the project.

   • Bibliography: Students should indicate the sources of information used for the project, such as books, websites, and videos.

2. Oral presentation: Each group must make an oral presentation summarizing the work done, presenting the results obtained, and discussing the conclusions.