Contextualization

Mixtures are a fundamental part of our daily lives. From the air we breathe, which is a mixture of gases, to the food we eat, which is a mixture of different ingredients, we constantly interact with mixtures. Understanding how mixtures work is vital to understanding the world around us.

Non-reactive mixtures, also known as homogeneous mixtures or solutions, are particularly useful in many applications. They are mixtures where the individual components do not react with each other, but mix uniformly. A common example is the dissolution of sugar in water - sugar and water do not react chemically, but mix to form a homogeneous solution.

Introduction

Before we delve into the practical activity, it is important that we understand good theoretical details about what Non-reactive Mixtures are.

Mixtures are formed by the combination of two or more substances where each maintains its chemical identity. When we talk about non-reactive mixtures, we are referring to a mixture where the components do not change chemically, but simply combine physically. One of the great advantages of mixtures is that the constituents can be separated by physical processes.

In chemistry, a solution is a special type of homogeneous mixture composed of two or more substances. The substance present in greater quantity is usually called the solvent and the substance present in lesser quantity is called the solute. In a solution, the solute is dissolved in the solvent.

In our daily lives, drinking water is a common example of a solution. It is a mixture of water (the solvent) and various other dissolved substances (the solutes) such as mineral salts, gases, and organic matter.

Understanding mixtures is fundamental to various areas, from the food industry, through medicines, to sewage treatment processes. Non-reactive mixtures are especially important in situations where we want to combine substances to obtain a uniform mixture without altering the original chemical properties of the components.

Practical Activity

Activity Title: "From Cocktails to Perfumes: Creating Mixtures without Reactions"

Project Objective:

The objective of this activity is to provide students with the opportunity to explore the creation of non-reactive mixtures, observing how different substances can coexist in a single solution without reacting with each other. In addition, it is expected that students develop essential skills, such as teamwork, time management, and the ability to conduct experiments effectively.

Detailed Project Description:

In this project, groups will be challenged to create two different non-reactive mixtures: an alcohol-free cocktail and a perfume. Each group will select ingredients they wish to include in their mixtures, taking into account the desired smell, taste, and appearance.

For the cocktail, they should mix different juices, syrups, and sodas. For the perfume, they should mix essential oils, water, and alcohol. There will be no chemical reactions between the ingredients, but they will combine to form a homogeneous solution.

Required Materials:

• Various juices, syrups, and sodas for the cocktail creation
• Various essential oils, water, and alcohol for the perfume creation
• Measuring cups and pipettes for precise measurement of ingredients
• Suitable containers for the creation and storage of mixtures
• Precision scale for weighing components
• Paper and pen for recording observations

Activity Steps:

1. Form groups of 3 to 5 students. Each group should choose their ingredients for the two mixtures.

2. First, the groups should focus on creating the cocktail. They should weigh and measure each ingredient carefully before adding it to the mixture.

3. After mixing the ingredients, the groups should carefully observe the resulting solution. They should note the appearance, smell, and taste of the mixture.

4. Next, the groups should repeat the process for creating the perfume. Again, they should weigh and measure each ingredient carefully before adding it to the mixture.

5. After mixing the ingredients, the groups should once again carefully observe the resulting solution. They should note the appearance and smell of the mixture.

6. With the mixtures finished, the groups should analyze their results. They should discuss how the ingredients combined to form a single solution, even without reacting with each other.

7. Each group will create a finalized report on their experience. The report should contain introduction, development, conclusions, and bibliography.

Note: Each group should choose a member to write the document. This member will be responsible for ensuring that all information is included, but all group members should participate by providing observations, conclusions, and ensuring that the report is clear and accurate. The task of writing the report should be divided equally among the group members.

Project Deliverables:

Each group will deliver:

1. The two mixtures created (the cocktail and the perfume)
2. A written report of the activity. This report should include:

• Introduction: Contextualization of the theme, revitalization and real-world application, as well as the objectives of this project.
• Development: The theory behind non-reactive mixtures, a detailed explanation of the activity, the methodology used, and the results obtained.
• Conclusion: Summarize the main points, detail the learnings obtained, and the conclusions drawn from the project.
• Bibliography: The sources used for the project, such as books, web pages, videos, etc.

The activity should be completed within a week. Each student should dedicate between two to four hours for its execution.

The technical and socioemotional skills acquired during the project should be discussed and analyzed in the final report.