Contextualization

Organic Chemistry is a subarea of Chemistry that is dedicated to the study of carbon compounds and their respective properties, reactivity, and applications. A remarkable characteristic of these compounds is the great diversity of structures and properties, which makes them fundamental for the existence and functioning of all known forms of life, as well as raw materials for a multitude of products in our daily lives, from medications to plastics and fuels.

The physical properties of organic compounds, such as boiling point, melting point, solubility, density, among others, are extremely important because they have a direct influence on the chemical reactions, industrial processes, and technological applications of these compounds. For example, the boiling point of a substance determines the temperature at which it changes from a liquid to a vapor state, which is crucial for distillation, one of the most common processes in the chemical industry.

These properties are determined by the intermolecular forces that act between the molecules of the compounds. Knowing and understanding these forces is essential to comprehend, predict, and manipulate the behavior of organic compounds. Furthermore, it is essential to know how these forces relate to the molecular structure of the compound.

Organic Chemistry is all around us. From the food we eat, the medicines we take, the clothes we wear to the fuels we use in our vehicles, everything has Organic Chemistry as its foundation. Therefore, understanding the physical properties of organic compounds is essential not only for chemists but for all of us. Studying this topic allows us to understand what determines the effectiveness of a medication, the resistance of a material, or the efficiency of a fuel, for example.

In this sense, we suggest consulting the following resources to deepen your knowledge on the topic:

1. Brazil School: Organic Chemistry I (https://brasilescola.uol.com.br/quimica/quimica-organica.htm)
2. Khan Academy: Introduction to Organic Chemistry (https://pt.khanacademy.org/science/organic-chemistry)
3. YouTube: Chemistry in Action - Prof. Paulo Valim (https://www.youtube.com/user/cienciascanal)

Practical Activity

Activity Title: Organic Compound Detective

Project Objective

The objective of this project is to create an investigation on different organic compounds and their physical properties. Students should research, collect information, and analyze the properties of different organic compounds, such as melting and boiling points, solubility in water, and polarity. Additionally, students should compare these properties and explain how the molecular structure of a compound affects its physical properties.

Project Description

Students will be divided into groups of 3 to 5 members, and each group will be responsible for investigating and presenting information about three different organic compounds.

Firstly, each group must research and collect information about the characteristics and physical properties of their assigned compounds. This should include data on the melting and boiling points, solubility in water, and polarity of the compounds.

The students should then analyze the collected data and compare the properties of the different compounds. They should also consider how the molecular structure of the compound influences its physical properties.

Finally, the students should produce a report of their work, including all the collected information, their analyses, and conclusions.

Required Materials

• Internet access for research
• Paper and pens for taking notes
• Software for typing and formatting the report (e.g., Microsoft Word, Google Docs)

Step by Step

1. Divide the students into groups of 3 to 5 members.
2. Assign three different organic compounds to each group for them to investigate.
3. Instruct the students to research and collect information about the physical properties of the compounds, including melting and boiling points, solubility in water, and polarity.
4. Ask the students to analyze and compare the properties of the different compounds.
5. Instruct the students to consider how the molecular structure of the compound influences its physical properties.
6. Ask the students to prepare a report of their work, including all the collected information, their analyses, and conclusions.

Project Deliverables

Students must deliver a report of their work, formatted according to the following sections:

1. Introduction: Students must contextualize organic compounds and their properties and explain why understanding these properties is important.

2. Development: Students must list the information collected about their assigned compounds, including data on melting and boiling points, solubility in water, and polarity. They must also explain and analyze this data, considering how the molecular structure of the compound influences its physical properties.

3. Conclusions: Students must summarize their results and the conclusions they drew from them. They must also reflect on what they learned from the activity.

4. Bibliography: Students must list all the sources from which they collected information about their compounds.