Contextualization

The "mol" is a basic unit in the International System of Units used to express the quantity of a substance. It is crucial for the understanding and development of concepts in Chemistry, including the exact determination of quantities of reagents and products involved in chemical reactions.

Much like a dozen, which refers to twelve units of something, a mole represents approximately 6.02 x 10²³ units of the substance in question. This exceptionally large number is known as Avogadro's number and is used because the particles of a substance - whether they are atoms, molecules, or ions - are incredibly small, requiring an appropriate counting measure.

Understanding the concept of mole may seem abstract, but it is crucial to understand how Chemistry works on a microscopic scale and, ultimately, how it applies to the world around us.

The amount of matter, expressed in moles, is closely related to the mass of substances. This connection is established by the concept of Molar Mass, which allows chemists to solve problems involving the amount of matter in a substance from its measured mass and vice versa.

Thus, these concepts become fundamental tools, for example, in the chemical industry, where it is necessary to accurately measure the quantities of reagents to produce the desired amount of a product. It is also applied in other fields, such as pharmacy, where the correct dosage of a medication can be crucial to a patient's health.

Therefore, understanding the mole and the amount of matter is not only fundamental to Chemistry but to various areas of science and industry, being an essential part of our daily lives.

Atividade Prática

The Great Mole - A Practical and Integrated Approach

Project Objective

This project aims to provide a playful and interdisciplinary approach to understanding and applying the concept of mole and amount of matter. It seeks not only to explore the theoretical details but also to bring a real-world application to the classroom, allowing students to experience firsthand how the concepts of mole, Avogadro's number, and molar mass are applied in practice.

Project Description

Students, divided into groups of three to five, will carry out a project with an estimated duration of 15 hours, which will involve practical experiments, chemical calculations, a gaming element, and a final report. The project will be divided into three main parts: 1) Practical Experiment, 2) The Quest for the Lost Mole (Game), and 3) Writing a report.

Required Materials

• Precision balance
• Various substances for experimentation (salt, sugar, etc.)
• Calculators
• Explanatory articles and videos about the mole
• Paper and pen for notes
• Computers with internet access
• Cardboard paper, colored pens, scissors, and glue for creating the game board

Detailed Step-by-Step

Part 1: Practical Experiment

1. Each group will choose a substance (for example, sugar or salt) and weigh it to obtain a sample of exactly 1 mole. To do this, they will need to research the molar mass of the substance and use the definition of mole to determine the necessary mass.

2. Next, the students will calculate how many molecules are present in their sample, using Avogadro's number.

3. After calculating, the students will discuss and reflect on the magnitude of the number of molecules in their sample and what that number means in the context of their daily lives.

Part 2: The Quest for the Lost Mole

1. Each group will create a board game where the objective is to find the "lost mole." The board will consist of several "houses" indicating different actions that players must perform.

2. Some houses would involve answering questions on the mole concept (e.g., "What is Avogadro's number?", "How many moles are in 12 grams of carbon-12?"), some would involve real-life applications (e.g., "Solve a problem involving the number of moles in a specific volume of air at room temperature and pressure."), and some could involve fun, game-based mechanics (e.g., "Swap places with the player in the lead.").

3. Groups would then present their board games to the class, explaining the rules and mechanics. If time permits, groups could swap games and play each other's.

Part 3: Writing a Report

1. After completing the previous steps, each group must write a report on the project. The report should include:

   • Introduction: Presenting the concept of the mole and its relevance and application in the real world, as well as the project's objective.
   • Development: Explaining in detail the theory behind the mole, the activities carried out, including the experiment and the game, the methodology used, and the results obtained.
   • Conclusions: Summarizing the main points, explaining the learnings obtained, and drawing conclusions about the project.
   • Bibliography: Citing the sources used for the project's elaboration.

2. The report, along with the board game created, will be the main deliverable of each group. This report should be a well-founded reflection of what was learned and experienced during the project.

Project Deliverables

Each group must deliver the following:

• The 1 mole sample of the chosen substance.
• The calculation of the number of molecules in the sample.
• The board game created by them, along with an explanation of the rules and mechanics.
• A well-founded report that reflects what was learned and experienced during the project.

The purpose of these deliverables is to clearly and solidly demonstrate the students' understanding of the mole and the amount of matter, as well as their application of these concepts in a practical and playful context.