Gases and Their Properties

The video tutorial explains the composition of air, highlighting that nitrogen makes up 78%, oxygen 21%, and other gases 1%. It discusses the properties of these gases, noting that they are mostly odorless, colorless, and slightly soluble in water. The video explores the uses of nitrogen in food preservation and as a coolant, the role of oxygen in respiration and industry, and the applications of carbon dioxide in photosynthesis and as dry ice. It also touches on other air components like dust particles and water vapor, and their effects such as smog formation.

What percentage of the air is made up of nitrogen?

• 21%

• 78%

• 50%

• 1%

Which gas is the only one required for burning?

• Nitrogen

• Carbon Dioxide

• Oxygen

• Helium

Why are potato chips kept fresh in their bags?

• Because of the colorless property of rare gases

• Because of the sour taste of carbon dioxide

• Because of the nonreactive property of nitrogen

• Because of the reactive property of oxygen

What is liquid nitrogen commonly used for?

• As a coolant

• For welding

• In soft drinks

• In fire extinguishers

Why do living things need oxygen?

• To help in the breakdown of food to provide energy

• To preserve food

• To form smog

• To create bubbles in soft drinks

How do fish breathe in water?

• With their scales

• With their gills

• With their fins

• With their lungs

What gas do plants inhale for photosynthesis?

• Nitrogen

• Oxygen

• Carbon Dioxide

• Helium

What is dry ice?

• Frozen oxygen

• Frozen nitrogen

• Frozen carbon dioxide

• Frozen helium

What forms smog in the air?

• Combination of water vapor and smoke

• Combination of nitrogen and oxygen

• Combination of carbon dioxide and helium

• Combination of rare gases and dust particles

Which gas is used in colorful signboards?

• Oxygen

• Nitrogen

• Carbon Dioxide

• Neon