Contextualization

Chemistry is the science that studies the composition, structure, and properties of matter, the changes that matter undergoes during chemical reactions, and its relation to energy. Within this science, one of the fundamental concepts refers to chemical bonds and, more specifically, to ionic and covalent bonds.

To fully explore this subject, you need to understand that atoms seek stabilization by forming chemical bonds with other atoms. The way these combinations occur depends on the electron structure of the atoms involved and is responsible for the formation of compounds with specific physical and chemical properties.

Ionic bonds occur between metal and non-metal atoms and involve the transfer of one or more electrons from the donor atom (metal) to the receptor atom (non-metal). As a result of this transfer, both atoms become ions (charged atoms) that attract each other and form the ionic compound.

On the other hand, covalent bonds occur between non-metallic atoms, where one or more pairs of electrons are shared between the atoms. Sharing these electrons allows both atoms to achieve stability by forming molecules.

The existence of ionic and covalent bonds is fundamental to life as we know it. The substances that form living beings, such as DNA, proteins, and fats, are composed of atoms that are covalently bonded. In addition, most of the materials that we use in our daily lives, such as table salt (NaCl), diamond (C), and water (H2O), have these chemical bonds that give these substances their unique characteristics.

The links below can be used as an initial reference for studying and understanding the subject:

1. Covalent Bonds
2. Ionic Bonds
3. Video about Chemical Bonds

Practical Activity: "Building Molecules"

Activity Title:

Building and Analyzing Molecular Models

Project Objective

1. Identify the difference between ionic and covalent bonds.
2. Analyze the structure of molecules formed by these bonds.
3. Develop teamwork, communication, and time management skills.

Project Description

Students will be divided into groups of 3 to 5. Each group will build molecular models of an ionic substance and a covalent substance using modeling clay and toothpicks. After building the models, they will analyze and discuss the characteristics of each bond and prepare a detailed project report.

Required Materials

1. Modeling clay of different colors
2. Toothpicks
3. Cardstock
4. Colored pens
5. Books and internet resources for consultation

Step-by-Step

1. Each group will choose a molecule that has an ionic bond and one that has a covalent bond to represent with models made of clay.
2. They will use modeling clay to represent the atoms and toothpicks to represent the bonds.
3. Each color of clay will represent a type of atom (e.g.: blue clay for oxygen, red clay for hydrogen, etc.).
4. After building the models, the groups will analyze their characteristics, observing the differences and similarities.
5. Each group will prepare an oral presentation explaining their molecules, the type of bond present, and its characteristics.
6. Finally, each group will prepare a detailed project report.

Project Submission and Report Writing

Students must submit the project in two parts:

1. Molecule Presentation: each group must present its molecules to the class, explaining in detail the types of bonds present and their characteristics.

2. Written Report - This report should be divided into:

   • Introduction: Describe the topic, its relevance, and the application of ionic and covalent bonds in the real world.

   • Development: Describe the theory of ionic and covalent bonds. Explain in detail the activity carried out, the methodology used, and show the constructed molecules. Discuss the results obtained.

   • Conclusion: Review the main points of the project, relate the learning acquired with the project, and draw conclusions about it.

   • Bibliography: List the sources that were consulted and used to carry out the project in the citation format.

All group participants must contribute to the report writing and their respective parts. This report will serve to assess students' understanding of the topic and the skills acquired.