Properties and Reactions of Oxygen

The video tutorial explains the role and properties of oxygen, including its production by plants and its use in respiration and combustion. It details oxygen's properties, such as being colorless, odorless, and tasteless, and its role in supporting combustion. The tutorial also covers the laboratory preparation of oxygen using hydrogen peroxide and manganese dioxide, highlighting the role of manganese dioxide as a catalyst.

What is the primary source of oxygen production on Earth?

• Oceans

• Animals

• Green plants

• Rocks

What is the molecular symbol for oxygen?

• O

• O2

• H2O

• O3

What percentage of the Earth's atmosphere is composed of oxygen?

• 10%

• 21%

• 50%

• 78%

Which of the following is NOT a property of oxygen?

• Odorless

• Colorless

• Tasteless

• Highly soluble in water

How is oxygen collected during its preparation in the lab?

• Using a vacuum pump

• Direct collection in a jar

• Downward displacement of water

• Upward displacement of air

What happens when a lighted magnesium ribbon is exposed to oxygen?

• It extinguishes

• It keeps burning and forms a white substance

• It melts

• It changes color

What is the white substance formed when magnesium burns in oxygen?

• Magnesium carbonate

• Magnesium sulfate

• Magnesium oxide

• Magnesium chloride

Which chemical is used as a catalyst in the preparation of oxygen in the lab?

• Sodium chloride

• Calcium carbonate

• Manganese dioxide

• Hydrogen peroxide

What role does manganese dioxide play in the preparation of oxygen?

• It reacts with oxygen

• It dissolves in water

• It acts as a catalyst

• It burns with a flame

What does hydrogen peroxide decompose into during the preparation of oxygen?

• Hydrogen and nitrogen

• Oxygen and nitrogen

• Water and oxygen

• Water and hydrogen