How Is Oxygen Used

This video explores the properties of oxygen, its role in respiration, and its chemical reactions. Oxygen, with atomic number eight, is a colorless, odorless gas essential for life on Earth. It makes up 21% of the Earth's atmosphere and is crucial for respiration, where it combines with glucose to release energy. Oxygen also reacts with metals, forming oxides like rust, which can be harmful, or protective layers like aluminum oxide. The video also discusses oxygen production in labs and its potential environmental impact if atmospheric levels were higher.

What is the atomic number of oxygen?

• 7

• 6

• 9

• 8

What percentage of Earth's atmosphere is made up of oxygen?

• 21%

• 18%

• 30%

• 25%

During respiration, what does oxygen combine with to release energy?

• Glucose

• Vitamins

• Fats

• Proteins

What is the common name for iron oxide formed by the reaction of iron with oxygen and water?

• Rust

• Patina

• Tarnish

• Verdigris

What would happen if Earth's atmosphere had 30% oxygen instead of 21%?

• Uncontrollable forest fires

• Increased plant growth

• Higher sea levels

• More stable weather patterns