Contextualization and Introduction

The balancing of chemical reactions is one of the fundamental pillars of Chemistry. In any chemical reaction, the involved atoms rearrange themselves to form new substances, but the quantity of each type of atom remains constant. This principle is known as the Law of Conservation of Mass.

In practical terms, the goal of balancing reactions is to ensure that there is no 'leftover' or 'missing' matter at the end of the reaction. For each chemical species, the number of atoms on the reactant side must be equal to the number of atoms on the product side.

The ability to balance chemical reactions is essential not only for the discipline of Chemistry but also for many scientific and technical careers. It is a crucial skill for chemists as it provides the basis for understanding chemical reactions, such as the formation and breaking of bonds and the interconversion of substances.

Balancing reactions plays a crucial role in many aspects of our daily lives and society. For example, in industrial processes such as the production of medicines, food, fuels, and many other chemical products, the precise balancing of chemical reactions is a prerequisite for process efficiency and safety.

In nature, balancing reactions is also fundamental. It is essential for photosynthesis, which allows plants to convert carbon dioxide and water into glucose and oxygen, and for respiration, which allows animals to convert glucose and oxygen into carbon dioxide and water. Thus, balancing reactions help maintain life on Earth.

To deepen your knowledge on the subject and prepare for the practical activity that will be proposed, I recommend the following sources:

1. Khan Academy: 'Balancing Chemical Equations' (https://www.khanacademy.org/science/chemistry/chemical-reactions-stoichiometry)

2. Manual da Química: 'How to Balance Chemical Equations' (https://www.manualdaquimica.com/quimica-geral/balanceamento-equacoes-quimicas.htm)

3. Brasil Escola: 'Balancing by Trial and Error' (https://www.brasilescola.com/quimica/balanceamento-por-tentativas.htm)

Practical Activity

Activity Title: Chemical Balance

Project Objective

This project aims to apply theoretical knowledge about balancing chemical reactions in a collaborative game, aiming at the development of technical and socio-emotional skills such as time management, communication, problem-solving, creative thinking, and proactivity.

Detailed Project Description

Students should form groups of 3 to 5 members to carry out the activity. The proposal is for students to develop a board game called 'Chemical Balance,' where to advance in the game, they need to correctly balance chemical reactions.

This is a long-term project, with one week allocated for completion. The recommended dedication time per group member is 2 to 4 hours.

Required Materials

1. Cardboard or Cardstock
2. Colored Pens
3. String
4. Scissors
5. Small stones, buttons, or other materials to serve as game pieces

Detailed Step-by-Step for Activity Execution

1. Draw the Board: On the cardboard or cardstock, draw the path that the game piece must follow, it can be in a spiral, zigzag, circle, etc. Divide this path into numbered spaces.

2. Create the Questions: In a separate document, create a list of chemical reactions to be balanced, one for each space on the board. The difficulty level of the equations should increase as the game progresses.

3. Game Rules: The group should create a set of rules to determine how the game is played, for example, how to decide who starts, how to advance in the game, what happens if you get the balance of a reaction wrong, etc.

4. Play: After building the game, the group should test it by playing among themselves. During the game, observe if the rules are clear and if the game is flowing well, make changes if necessary.

Project Deliverables

1. Report: Each group must produce a report containing:

   • Introduction: Contextualization of balancing chemical reactions and the relevance of the project.
   • Development: Explanation of the step-by-step for creating the game, a detailed description of the rules, discussion on the creation of questions and the difficulty level of the game.
   • Conclusion: Reflection on the experience, what they learned about teamwork and balancing reactions during the project, improvements that could be made to the game.
   • Bibliography: References used for creating the questions and for balancing the reactions.

2. The Game: The created game is also a deliverable of the project. It must be properly identified with the names of all group members.