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Some students set up an apparatus. Flask A has a water inside it and a plant. The top of the flask is being blocked off with some cotton wool. The same for Flask B however , there is not plant in Flask B. After 24 Hours the mass in Flask b has changed but the mass in flask a has stayed the same. Why does this happen?

Posted Sun 28th October, 2012 @ 20:04 by SciTech

2 Answers

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Answered Mon 29th October, 2012 @ 12:01 by Dementia
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Because water need to use oxygen inside flask A, it obsorb oxygen for photosynthesis and release carbon dioxide, but the amont of carbon dioxide is different to the oxygen obsorb, so the mass changed, also the mass of carbon dioxide and oxygen are different.  In flask B, there is no plant so there is no photosynthesis, therefore there is nothing happened.

Answered Mon 29th October, 2012 @ 12:09 by Ivan