Photosynthesis and Respiration -> oxygen

Oxygen

Oxygen is a chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds.

Properties of Oxygen:

• Atomic Number: 8
• Symbol: O
• Atomic Mass: 15.9994 atomic mass units
• Physical State at Room Temperature: Gas
• Color: Colorless
• Odor: Odorless
• Boiling Point: -183 °C
• Freezing Point: -219 °C
• Density: 1.429 g/L

Uses of Oxygen:

Oxygen has several important uses:

1. Respiration: It is essential for the survival of living organisms as it is used in the process of cellular respiration.
2. Medical Applications: It is used in medical settings for patients with respiratory conditions and in anesthesia.
3. Industrial Processes: It is used in various industrial processes such as metal cutting, welding, and in the production of steel and plastics.
4. Water Treatment: It is used to purify water and wastewater in treatment plants.

Oxygen Cycle:

Oxygen is constantly cycled through the environment in a process known as the oxygen cycle. It involves the production of oxygen through photosynthesis by plants, the consumption of oxygen by animals during respiration, and the exchange of oxygen and carbon dioxide in the atmosphere and oceans.

Study Guide Questions:

1. What is the atomic number of oxygen?
2. Describe the physical state of oxygen at room temperature.
3. What are the uses of oxygen in various industries?
4. Explain the role of oxygen in the process of cellular respiration.
5. Discuss the oxygen cycle and its importance in the environment.

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