Contextualization

Chemistry is a science that concerns itself with the composition, structure, properties, and changes of matter. In this sense, the study of gases becomes extremely relevant, as they are present in a variety of events and phenomena that constantly occur around us. In this project, we will explore one of the fundamental concepts in the study of gases: the mole x volume relationship under normal conditions of temperature and pressure (NTP).

The Ideal Gas Law establishes that the volume of one mole of gas, under normal conditions of temperature and pressure (0°C and 1 atm), is approximately 22.4 liters. This relationship is frequently used in stoichiometric calculations, allowing the analysis of gas transformations and the conservation of matter in chemical reactions, among others.

This concept of mole and gas volume at NTP not only helps to understand the nature of gases and their properties but also has applications in various areas of knowledge. In the field of Medicine, for example, knowledge about the mole-volume relationship is fundamental in calculations involving the use of anesthetic gases.

Theoretical Introduction

The first key concept for understanding our topic is the concept of mole, a fundamental unit in the study of Chemistry. A mole is the amount of substance that contains as many elementary entities (atoms, molecules, ions, etc.) as there are atoms in 12 grams of carbon-12.

The second key concept is the understanding of normal conditions of temperature and pressure (NTP), which are a standard set of conditions for experimental measurements established to allow comparisons between data sets. In Chemistry, NTP is a temperature of 0°C (273.15 K) and a pressure of 1 atm.

The third key concept is the Ideal Gas Law, which establishes the relationship between pressure, volume, and temperature of a certain amount of gas, provided that the temperature is in kelvins. This law is expressed by the formula PV=nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.

Practical Activity

Activity Title: "Heading to Space: The Ideal Gas Balloon"

Project Objective:

Understand the mole x volume relationship of gases under normal conditions of temperature and pressure (NTP) through the realization of a practical experimental activity, synthesis of a report, and presentation of the results.

Detailed Project Description:

In this practical activity, students will be challenged to assemble an experimental helium balloon to illustrate the concept of mole, volume, and normal conditions of temperature and pressure. The group that manages to make the balloon rise to the greatest height, maintaining the balance between volume, number of moles, and pressure, will be the winner. Additionally, each group must document the entire process in a written report.

Required Materials:

• Latex balloons
• Helium pump
• String
• Tape measure
• Thermometer
• Manometer

Detailed Step-by-Step for Carrying Out the Activity:

1. Each group will receive a kit with the necessary materials.
2. Students will research to understand the theory behind ideal gases and how the number of moles, volume, and pressure relate.
3. Based on the learned theory, students will make calculations and estimates to determine the amount of helium gas (in moles) needed to fill the balloon and make it rise, considering the current conditions of temperature and pressure.
4. Students will fill the helium balloon according to their estimates.
5. Each group will launch their balloon and note how long it takes to rise to a predetermined height using the tape measure.
6. The group that manages to make the balloon rise to the greatest height, maintaining control of the volume and pressure, will be the winner.
7. Students will document the entire process and results in their reports.

Project Deliverables:

• Written Report: After the practical activity, students must produce a report. This report should contain:

  • Introduction: Description of the objective of the practical activity, the relevance of the mole x volume relationship at NTP, and how this activity helps understand this relationship. The text should be motivating and show how this subject applies in the real world.
  • Development: Detailed explanation of the theory explored in the report, as well as a detailed description of how the practical activity was carried out. Presentation of the calculations and results obtained during the activity. Analysis and discussion of the results, comparing what was planned with what was observed in practice.
  • Conclusions: Review of the main points addressed in the report, lessons learned, discussion on how the practical experience helped understand the theory, and suggestions for improvements or new experiences.
  • Bibliography: List of all sources used in the project, such as books, websites, videos, etc.

• Oral Presentation: Each group will make a 10 to 15-minute presentation to the class, explaining what they learned, how they made the balloon, the challenges encountered, how they overcame these challenges, and what they learned in the process.