Contextualization

Chemistry is a fascinating science that allows us to understand the world around us. Many of the phenomena we observe in our daily lives are explained by it. One of these fundamental concepts in Chemistry is the idea of "states of matter". You have probably heard of the three most common states: solid, liquid, and gas. But have you ever stopped to think about what defines each of these states, and what happens when matter changes from one state to another?

"States of matter" is a fundamental concept that helps us understand how matter behaves in different circumstances. For example, why does water turn into ice when we put it in the freezer? Or why does steam form when we boil water? These are examples of state transitions, and that's exactly what we will learn about in this project.

We know that physical states play a crucial role in our daily lives. When we cook, we use heat to change the physical state of our food (for example, when we boil eggs, or when we turn liquid water into steam to cook vegetables). Furthermore, most industrial processes, such as oil distillation or plastic production, involve changes in physical states. Therefore, understanding the concept of physical states and how they change is crucial not only for Chemistry but also for many aspects of our lives.

Below, we suggest some reliable sources, in Portuguese, that you can use to delve deeper into the topic:

1. Brasil Escola: States of Matter
2. Portal Educação: Changes in Physical States of Matter
3. YouTube - Ciência em Ação: States of Matter
4. Manual do Mundo - Iberê Thenório: Why does water turn into steam?

Practical Activity: "State Transitions"

Project Objective

The objective of this project is to investigate the behavior of matter in its different phases (solid, liquid, and gas) and how temperature affects these transitions. The project will be carried out by groups of 3 to 5 students and must be completed within one week.

Project Description

Each group will conduct a series of experiments using water to demonstrate the transitions between the three common states of matter. Each group member will have a specific role to play during the experiments:

1. Group Leader: Responsible for organizing the team, delegating tasks, and ensuring that everyone is fulfilling their responsibilities.
2. Recorder: Responsible for taking notes, recording observations, and taking photos of the experiments.
3. Operator: Responsible for handling materials and conducting the experiments.

Required Materials

• Ice
• Water
• Kettle or pot
• Stove
• Stopwatch
• Plastic cups
• Thermometer
• Camera (can be a cellphone)

Project Step-by-Step

1. Start with a quantity of ice in a plastic cup. Record the temperature of the ice and note the observation of its physical state. Take a photo.
2. Let the ice reach room temperature and observe the state change until it becomes liquid. Record the time required for the transition and note the observations. Take a photo.
3. Place the water (which was previously ice) in a kettle or pot and heat it until it boils. Record the time required for the water to start boiling and the temperature at which this occurs. Note the observations and take a photo of the steam.
4. Discuss in your group what you observed in each phase of the experiment.

Project Deliverables

At the end of the project, the group must produce a report documenting the experiment. The report should include:

• Introduction: Explain the objective of the experiment and its relevance. Include the theory of states of matter and phase transitions.
• Development: Describe in detail the process of the experiment, the observations, and the results.
• Conclusion: Explain what was learned from the experiment and how the results relate to the theory of states of matter.
• Bibliography: List all sources of information used in the project.

In addition to the report, the group must prepare a visual presentation of the experiment results to share with the class. This can be done through a poster, a slide presentation, or a video.

Students should be encouraged to be creative in presenting their projects, incorporating illustrations, graphics, and photographs. Above all, they should work together to present their findings in the clearest and most interesting way possible.