CH-365
Composition of air
Chemistry · Secondary 3 · Hard · Composition of air
Sample X is clean, dry air with composition: 78% nitrogen, 21% oxygen, 1% other gases. Sample Y, taken from a room after many candles have been burning, contains 78% nitrogen, 19% oxygen and 3% carbon dioxide. Which process best explains the change from X to Y?
- Vigorous burning of fuels in the room
- Photosynthesis by many plants in the room
- Adding extra nitrogen gas to the room
- Passing the air through a drying agent
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