how can you show that oxygen is only one fifth of the components of the air???
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Aim of the experiment - To show that oxygen occupies one-fifth of the air by volume
Materials required - candle, trough, water, glass tumbler
Procedure - Fill the trough with water. Take a lighted candle and place it carefully at the centre of the trough.Now take a glass tumbler and use a marker pen to mark five equal portions on the tumbler. Invert this tumbler over the burning candle.Observation - The candle burns for some time and is then extinguished. The water rises from the edge of the inverted tumbler to occupy about one-fifth of it.
Inference -
The candle burnt till oxygen was present, Once the oxygen inside the tumbler was used up, it stopped burning. The air was devoid of oxygen inside the tumbler and as such the water from the trough moved up the tumbler and occupied its place, Since the candle was extinguished after about one-fifth of the air being used up, we know the gas used up was oxygen as it is the only gas in air which supports combustion. Thus, it is proved that oxygen occupies about one-fifth of the air by volume.
Materials required - candle, trough, water, glass tumbler
Procedure - Fill the trough with water. Take a lighted candle and place it carefully at the centre of the trough.Now take a glass tumbler and use a marker pen to mark five equal portions on the tumbler. Invert this tumbler over the burning candle.Observation - The candle burns for some time and is then extinguished. The water rises from the edge of the inverted tumbler to occupy about one-fifth of it.
Inference -
The candle burnt till oxygen was present, Once the oxygen inside the tumbler was used up, it stopped burning. The air was devoid of oxygen inside the tumbler and as such the water from the trough moved up the tumbler and occupied its place, Since the candle was extinguished after about one-fifth of the air being used up, we know the gas used up was oxygen as it is the only gas in air which supports combustion. Thus, it is proved that oxygen occupies about one-fifth of the air by volume.
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Answer:
Fix two candles of the same length on a table. Light both the candles. Cover one of the candles with a inverted glass tumbler. Observe both the candles carefully.
Do both the candles continue to burn or go off?
You must have observed that the candle covered with glass tumbler got extinguished after some time, whereas the other candle continued burning.
Explanation:
The candle got extinguished because the component inside of the glass tumbler, which supports burning, is limited. Most of the component is used up by the burning candles. However, the other candle is getting continued supply of air. This component of air, which supports burning is known as oxygen.
Thus oxygen make the one fifth part of the air.
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