CHEM 120 Week 1 Lab Report
Student Name
Chamberlain University
CHEM-120 Intro to General, Organic & Biological Chemistry
Prof. Name
Date
OL Lab 1: Chemistry Safety and Atomic Structure – Assessing the Possibility of Life on Other Planets
Learning Objectives
The primary goals of this laboratory session are as follows:
- Identify laboratory hazards associated with chemical handling and understand preventive measures.
- Respond effectively to fire emergencies, applying correct safety protocols to save lives.
- Utilize CAS (Chemical Abstracts Service) numbers to accurately plan experimental procedures.
- Differentiate between halogenated and non-halogenated waste and follow proper disposal techniques.
- Interpret H (Hazard) and P (Precautionary) phrases using Safety Data Sheets (SDS).
- Safely operate a chemical fume hood for volatile or hazardous reactions.
- Describe atomic structure and the characteristics of subatomic particles (protons, neutrons, electrons).
- Explain atomic number, atomic mass, and isotopes in relation to chemical properties.
- Understand the quantum model of the atom and the significance of the four quantum numbers.
Chemistry Safety and Laboratory Hazards
Dangers in the Laboratory
Laboratories contain a wide variety of hazardous chemicals, each posing potential risks to human health and the environment. Identifying these hazards is a critical first step in experimental planning.
Some common hazards include:
| Hazard Type | Example Chemicals | Potential Risks | Preventive Measures |
|---|---|---|---|
| Corrosive Agents | Hydrochloric Acid | Burns to skin, eyes, and respiratory tract | PPE, fume hood, careful handling |
| Flammable Liquids | Ethanol, Acetone | Fire and explosion risks | Keep away from ignition sources, proper storage |
| Toxic Substances | Mercury Compounds | Systemic poisoning, neurological effects | Minimize exposure, use appropriate containers |
| Reactive Chemicals | Sodium, Peroxides | Violent reactions with water or air | Store in inert atmosphere, avoid contact with water |
Atoms and Subatomic Particles
Atoms are the basic units of matter, composed of three main subatomic particles:
| Particle | Charge | Location in Atom | Relative Mass |
|---|---|---|---|
| Proton | +1 | Nucleus | ~1 atomic mass unit |
| Neutron | 0 | Nucleus | ~1 atomic mass unit |
| Electron | -1 | Orbitals around the nucleus | ~1/1836 of a proton |
In the Atomic Structure simulation, learners explore how altering the number of electrons changes the charge of an atom, creating cations (positively charged) or anions (negatively charged).
Identifying Elements from the Periodic Table
During the simulation, participants are virtually transported to an exoplanet to collect rock samples. Upon return to the lab, the properties of these samples are analyzed using the periodic table for elemental identification.
Understanding Isotopes
Isotopes are variants of the same element with identical numbers of protons but different numbers of neutrons. For example:
| Isotope of Carbon | Protons | Neutrons | Mass Number |
|---|---|---|---|
| Carbon-12 | 6 | 6 | 12 |
| Carbon-14 | 6 | 8 | 14 |
The Quantum Model and Quantum Numbers
The quantum mechanical model describes the behavior of electrons around the nucleus using four quantum numbers:
- Principal quantum number (n) – energy level of the electron.
- Angular momentum quantum number (l) – shape of the orbital.
- Magnetic quantum number (ml) – orientation of the orbital.
- Spin quantum number (ms) – direction of electron spin.
Part 1: Chemistry Safety Lab Questions and Answers
1. Look up an MSDS of the chemical HCl. What are the major hazards and what precautions would you take when handling this chemical?
Hydrochloric acid (HCl) is highly corrosive to skin, eyes, and respiratory tissue. Inhalation or ingestion can be fatal. Prolonged exposure may erode dental enamel. It is also corrosive to metals. Safety measures include:
- Wearing gloves, goggles, and a lab coat.
- Using a chemical fume hood.
- Storing in a corrosion-resistant container.
- Avoiding inhalation of vapors.
2. Why is proper waste disposal important in a lab setting?
Proper waste disposal prevents hazardous chemical accumulation, reduces environmental contamination, and ensures the safety of personnel. Incorrect disposal may cause dangerous chemical reactions or pollute water sources.
3. Why is the proper usage of personal protective equipment (PPE) key to a safe lab experience?
PPE serves as a physical barrier against harmful substances. Correct and consistent use minimizes direct exposure to chemicals, prevents injuries, and ensures compliance with safety regulations.
Part 2: Atomic Structure Lab Questions and Answers
1. Purpose: Describe in complete sentences and in your own words, the purpose of this experiment.
The purpose of this lab is to investigate the chemical composition of an exoplanet’s environment and determine whether it could support life. This is achieved by collecting samples, analyzing their elemental content, and interpreting atomic structure principles.
CHEM 120 Week 1 Lab Report
2. Observations: Record three observations from the simulation.
| Observation No. | Description |
|---|---|
| 1 | Samples from various locations differed in color and chemical composition. |
| 2 | A gray/white rock reacted with a reagent, confirming the presence of carbon. |
| 3 | Ion charge depends on electron gain or loss (anions gain, cations lose). |
3. In your own words, explain the terms below:
- Ion – An atom or molecule with an unequal number of protons and electrons, resulting in a net electrical charge.
- Isotope – Atoms of the same element that have identical proton counts but different neutron counts.
4. Describe the three subatomic particles that make up atoms.
- Protons – Positively charged, located in the nucleus, contribute to atomic identity.
- Neutrons – Neutral charge, located in the nucleus, contribute to atomic mass.
- Electrons – Negatively charged, orbit the nucleus in energy levels, determine chemical reactivity.
5. You have an atom of carbon with a mass number of 14. Determine the number of protons, neutrons, and electrons you would expect this atom to possess.
- Protons: 6 (defines the element as carbon).
- Neutrons: 8 (mass number 14 – protons 6).
- Electrons: 6 (neutral atom, electrons equal protons).
6. Reflection:
This experiment reinforced understanding of atomic composition, isotopes, and ions, and applied these concepts to astrobiology. The detection of carbon and water on an exoplanet suggests possible habitability. In real-world contexts, such skills are critical for environmental monitoring, pharmaceutical development, and radiological medicine. For example, knowledge of isotopes is essential in nuclear medicine for diagnostic imaging and cancer therapy, while ion chemistry is central to developing safe chemical products.
References
American Chemical Society. (2020). Safety in academic chemistry laboratories (8th ed.). Washington, DC: ACS.
National Institute for Occupational Safety and Health (NIOSH). (2021). Hydrochloric acid: Chemical hazard information. U.S. Centers for Disease Control and Prevention.
CHEM 120 Week 1 Lab Report
Zumdahl, S. S., & Zumdahl, S. A. (2020). Chemistry: An atoms first approach (3rd ed.). Cengage Learning.