Contextualization

In this project, we will have a fascinating journey through the world of "Salt", one of the most common and essential compounds for life as we know it. Salt, also known as sodium chloride (NaCl), is much more than just a fundamental ingredient in our food - it is also a window to understanding essential concepts in chemistry and various other disciplines.

Introduction

The chemistry of salt is a wonderful example of the richness and complexity of the molecular world. Starting with its formation: salt is formed by the combination of an alkali metal (sodium) and a halogen (chlorine), the result of a chemical reaction called "neutralization". This is a key concept that opens the doors to understanding many other chemical processes.

Salt is also a prime example of an "ionic compound". This means that it is composed of positive ions (cations) and negative ions (anions) that attract each other and form a regular crystalline structure. Studying the properties of salt allows us to understand many characteristics of ionic compounds in general, including why they are solids at room temperature and have high melting and boiling points.

Finally, salt is a fascinating topic to explore "solubility", that is, the ability of a substance to dissolve in another. Salt is highly soluble in water, which has a series of implications for ocean chemistry and the water cycle on Earth.

Contextualization

Salt plays a crucial role in our history and culture. Since ancient times, salt has been vital for food preservation. Furthermore, salt has been the subject of trade and dispute, and even used as currency in some cultures. The demand for salt influenced the development of trade routes, cities, and even empires.

In the modern world, salt remains an essential resource. In addition to its culinary use, salt is a key component in the production of a range of industrial products, such as plastic, paper, glass, and much more.

To have a solid foundation on the subject, we suggest studying the concepts and contexts mentioned above using resources such as:

• General chemistry books for high school.

• Reliable educational websites, such as Manual do Mundo and Khan Academy, which offer a series of videos and materials on the topic.

• Articles in online encyclopedias in Portuguese, such as Wikipedia and InfoEscola, which provide detailed information and additional references on the topic.

Remember, the goal is to develop a deep and applied understanding of the role of salt in chemistry, nature, and society.

Practical Activity

Activity Title:

Journey to the World of Salt: From Theory to Practice

Project Objective:

Develop a holistic and applied understanding of salt through research, practical experiments, and evaluation of its uses and implications.

Detailed Project Description:

In this project, you will embark on a multi-disciplinary journey exploring the world of salt. You will be divided into groups of 3 to 5 students and will have to complete three main tasks:

1. Theory and Research: You will start by researching the theory behind salt. This should include, but not be limited to, its chemical composition, its formation via neutralization reaction, its properties as an ionic compound, its solubility in water, and its importance for ocean chemistry and the water cycle. You should also research the historical and cultural importance of salt, as well as its role in modern industry.

2. Practical Experiments: After researching the theory, you will conduct a series of practical experiments to demonstrate some of the key concepts you have learned. This includes, but is not limited to, experiments to demonstrate neutralization reaction, the formation of an ionic compound, and solubility.

3. Implications and Applications: Finally, you will need to evaluate the implications of salt use in various applications (industrial, everyday, architectural, or technological). You may propose safe and sustainable solutions considering your local and everyday context.

The project should be carried out over approximately one month. We estimate that each student should dedicate at least 12 hours in total to the project.

Required Materials:

• Access to the internet and/or general chemistry books for research.
• Basic chemistry laboratory materials for experiments, including sodium chloride (table salt), acids and bases (such as vinegar and baking soda), safety equipment, beakers, etc.
• Paper and pen for notes.
• Camera (can be a cellphone camera) to record the experiments.

Detailed Step-by-Step for Activity Execution:

1. Research: Start by researching the key topics mentioned in the project description. Take detailed notes and make sure you fully understand each concept. Remember to also look into the historical, cultural, and industrial importance of salt.

2. Practical Experiments: Plan and conduct a series of experiments to illustrate the concepts you researched. For example, you can perform a neutralization reaction using an acid and a base to produce salt. Or you can measure the solubility of salt in water at different temperatures. Make sure to follow all laboratory safety rules during the experiments.

3. Evaluation of Implications and Applications: After completing the experiments, think about the implications of what you have learned. How can the acquired knowledge be applied in a variety of sectors? Could you propose safe and sustainable solutions for salt use in your community? Discuss and record your ideas.

Project Deliverables:

• Report: Each group must produce a detailed report covering all aspects of the project. The report should include an Introduction, where you contextualize the theme and describe the objective of your project. In the Development section, you should explain the theory behind salt, detail the activity, present the methodology used, and discuss the results obtained. In the Conclusion, you should summarize the main points, state the learnings acquired, and draw conclusions about the project. The report should end with the Bibliography used.

• Presentation: Each group must prepare a PowerPoint presentation or similar format, detailing what they have learned and the results of the experiments conducted. The presentation should also include a segment on the implications and possible applications of salt in different sectors, based on your research.

• Photos or Videos of Experiments: Each group must take photos or record videos of the experiments conducted to include in the report and presentation.

By the end of the project, your knowledge about salt, its role in chemistry and society, will be greatly enriched. Additionally, you will have acquired essential skills in research and experimentation, as well as socio-emotional skills such as time management, communication, problem-solving, creative thinking, and proactivity.