5 Questions
What percentage of the atmosphere is made up of oxygen?
21%
Which of the following is true about the oxygen cycle?
The oxygen cycle includes both biotic and abiotic components.
Which of the following is NOT a form in which oxygen is found?
Methane (CH4)
What are some processes in which oxygen is used up?
Respiration and combustion
What is the level of reactivity of oxygen?
Oxygen is highly reactive.
Study Notes
Oxygen Composition
- Oxygen makes up approximately 21% of the Earth's atmosphere.
Oxygen Cycle
- The oxygen cycle involves the movement of oxygen between the atmosphere, oceans, land, and living organisms.
Forms of Oxygen
- Oxygen is found in various forms, including molecular oxygen (O2), ozone (O3), and oxygen atoms.
- Plasma is NOT a form in which oxygen is found.
Oxygen Consumption
- Oxygen is used up in various biological processes, including:
- Respiration in living organisms
- Decomposition of organic matter
- Combustion of fossil fuels
Reactivity of Oxygen
- Oxygen is highly reactive, readily forming compounds with other elements.
- Its high reactivity is due to its high electronegativity, which allows it to attract electrons from other atoms.
Test your knowledge on the oxygen cycle and its role in the biosphere. Explore how oxygen is produced, circulated, and used up in the atmosphere. Learn about its reactivity and its presence in different spheres.
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