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secondary 4 | E Maths
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Need help for explanation. Why ans is C? Thank u
Date Posted: 10 months ago
Views: 152
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Greetings.
Rusting requires oxygen and water to react with iron. Water is plentiful in the set-up, and oxygen comes from the air that is trapped in the inverted test-tube.
Oxygen takes up approximately 21% of air. That comes up to roughly a fifth. Thus, 4 cubic cm of oxygen is about a fifth of the volume of the air initially. That reasons that the original volume of air is 20 cubic cm.
Hope this helps. Regards
Rusting requires oxygen and water to react with iron. Water is plentiful in the set-up, and oxygen comes from the air that is trapped in the inverted test-tube.
Oxygen takes up approximately 21% of air. That comes up to roughly a fifth. Thus, 4 cubic cm of oxygen is about a fifth of the volume of the air initially. That reasons that the original volume of air is 20 cubic cm.
Hope this helps. Regards
Thank u! Helps a lot!
Excellent. Have a good one. Regards
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