Contextualization

Hello, dear students! Are you ready to embark on a fun and interactive project that involves one of the main topics in Chemistry? Our adventure today is about 'Substances and Mixtures'.

Did you know that almost everything around us is composed of combinations of substances? Yes! Our body, the food we eat, the air we breathe, everything is made up of mixtures of substances. But what exactly is a substance? And a mixture? In chemistry, a substance is a specific type of matter composed of a type of particle. A mixture, on the other hand, is composed of two or more substances. Have you ever stopped to think how amazing this is?

Substances can be simple (composed of a single type of chemical element) or compound (formed by two or more elements). Mixtures can be classified as homogeneous (where the components cannot be differentiated) or heterogeneous (where it is possible to identify each of the different substances). Now, how about delving deeper into the subject and finding out how to differentiate them from each other?

Importance of the Theme

Understanding substances and mixtures is the key to understanding the world around us. From the functioning of our body to the creation of new materials, the study of substances and mixtures is present. For example, understanding what a homogeneous mixture is essential to understand why the air (a mixture of gases) seems the same everywhere.

Furthermore, the separation of mixtures is a frequent activity in laboratories and industries, being a very important method in the production of medications, water purification, food production, among others. Therefore, the study of substances and mixtures is fundamental for our daily lives. And not only that, it is also the basis for understanding many other concepts within Chemistry.

For this project, we suggest that you consult the following reliable resources:

1. Book 'Chemistry: The Central Science' by Brown, LeMay, Bursten, Murphy, and Woodward.
2. USP Chemistry Teaching Website: http://educarquimica.com.br/
3. Video 'Substances and Substance Mixtures - Chemistry - #04' from the Curso Enem Gratuito channel on Youtube: https://www.youtube.com/watch?v=9Jl4InSv2I8
4. Brasil Escola Website, Chemistry section: https://brasilescola.uol.com.br/quimica/

Don't forget, it is always important to verify the sources of your information. We are excited to see what you will discover!

Practical Activity: The Fascinating Journey of the Substance Separator

Project Objective

This activity aims to allow students to understand and differentiate pure substances from mixtures, the different types of mixtures, and how they can be separated.

Detailed Project Description

This project, divided into practical and theoretical activities, will be carried out in groups of 3 to 5 students. Each group will be responsible for conducting experiments involving the separation of substances from a complex mixture. In addition, students must produce a report confirming their learnings from the experiments.

Necessary Materials

• Sand
• Salt
• Charcoal
• Water
• 3 transparent containers
• Coffee filter
• Tablespoon
• Stove or another heat source

Detailed Step-by-Step for Carrying Out the Activity

1. Each group must create a complex mixture in one of the containers, adding 2 tablespoons of sand, 1 tablespoon of salt, and half a block of charcoal to the water.

2. Note the initial appearance of the mixture. Can you identify the different substances in it?

3. The next step is the separation. First, let's remove the most evident component: the charcoal. Using a spoon, remove the charcoal from the container.

4. The next component to be separated is the sand. For this, use the filtration method. Place the coffee filter in one of the empty containers and pour the mixture from the initially used container into it. Wait for the saltwater (filtered) to pass through the filter and the sand (residue) to be retained.

5. Finally, to separate the salt from the water, use the evaporation method. Place the saltwater directly on the stove or another heat source and let it evaporate until only the salt remains in the container.

6. After conducting the experiment, each group must write a project report, where they will report on the experience, the learnings, and the discovery about substances and mixtures.

Project Delivery and Connection with Activities

The learning during the practical activity should be complemented by the theory learned during the research to produce the project report. This report should contain:

1. Introduction: Provide context for the theme, its relevance and real-world application, as well as the objective of this project.

2. Development: Explain the theory behind the central theme of the project. Describe the activity in detail, indicate the methodology used, and finally present and discuss the results obtained. It is important to discuss the different substances that make up the mixture and the separation methods used, as well as their applications in everyday life.

3. Conclusion: Summarize the main points of the work, explaining the learnings obtained and the conclusions drawn about the project. Recall the importance of separating mixtures in everyday life and how learning this concept can be applied in various aspects of daily life.

4. Bibliography: Indicate the sources on which you relied to work on the project such as books, web pages, videos, among others.

The project will stimulate the development of time management skills, communication, problem-solving, and creative thinking.

Remember, it is important for students to understand that Chemistry is everywhere and that knowledge of this science has transformative power!