1. Describe an activity to demonstrate the following:
a. Presence of air in an empty bottle.
b. Presence of oxygen in air.
c. Presence of air in soil
Answers
Answer:
a
Method: Take the empty bottle and open its cap. ... Tilt the bottle. Observation: Bubbles at the mouth of the bottle will be observed. This is because when the bottle is tilted, the air inside it comes out in the form of bubbles.
b Activity: Take a candle and fix it on a table. The candle is lighted. The candle will continue to burn due to continuously available fresh air providing the required oxygen for combustion.
c Take a glass tumbler. Add some soil in it, then pour some water on the soil slowly, the air-bubbles comes out of the soil. This proves that soil holds air in it.
Answer:
a ... Tilt the bottle. ... This is because when the bottle is tilted, the air inside it comes out in the form of bubbles. Before tilting, the space inside the bottle gets filled with air, but as the bottle is tilted, the air rushes out. Conclusion: This activity proves that air is present in an empty bottle
b The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen
Explanation:
C Composition of air in soil and atmosphere: Nitrogen: Soil Air: 79.2% Atmosphere: 79.0% Oxygen: Soil Air: 20.6% Atmosphere: 20.9% Carbon Dioxide: Soil Air: 0.25% Atmosphere: 0.04%