Carbon dioxide in the exhaled air.

The video tutorial explains the process of inhaling oxygen and exhaling carbon dioxide. It introduces an experiment to detect carbon dioxide in exhaled air using lime water and a straw. The experiment involves exhaling into a test tube of clear lime water, which turns milky, indicating the presence of carbon dioxide. This simple experiment demonstrates the composition of exhaled air.

What do we primarily inhale and exhale during respiration?

• Inhale hydrogen, exhale nitrogen

• Inhale nitrogen, exhale oxygen

• Inhale oxygen, exhale carbon dioxide

• Inhale carbon dioxide, exhale oxygen

What is the purpose of the experiment discussed in the video?

• To measure the amount of oxygen in the air

• To observe the color change in lime water

• To detect the presence of carbon dioxide in exhaled air

• To find out how much nitrogen is in the air

Which materials are needed for the experiment to detect carbon dioxide?

• A test tube of clear lime water and a straw

• A flask and a pipette

• A test tube and a candle

• A beaker and a thermometer

What change is observed in the lime water during the experiment?

• It turns blue

• It turns red

• It turns clear

• It turns milky

What does the milky appearance of lime water indicate?

• Presence of oxygen

• Presence of nitrogen

• Presence of carbon dioxide

• Presence of hydrogen