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Questions and Answers
What percentage of the atmosphere is made up of oxygen?
What percentage of the atmosphere is made up of oxygen?
- 21% (correct)
- 15%
- 25%
- 10%
Which of the following is true about the oxygen cycle?
Which of the following is true about the oxygen cycle?
- Oxygen is only produced through photosynthesis.
- Oxygen is only used up in processes like respiration and combustion.
- The oxygen cycle is a simple process with no complexities.
- The oxygen cycle includes both biotic and abiotic components. (correct)
Which of the following is NOT a form in which oxygen is found?
Which of the following is NOT a form in which oxygen is found?
- Methane (CH4) (correct)
- Molecular oxygen (O2)
- Water (H2O)
- Carbon dioxide (CO2)
What are some processes in which oxygen is used up?
What are some processes in which oxygen is used up?
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What is the level of reactivity of oxygen?
What is the level of reactivity of oxygen?
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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.
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