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CBSE Class 12-science Answered

why are polythene bags are dangerous?
Asked by Gautam | 11 Dec, 2013, 01:38: PM
answered-by-expert Expert Answer
  • Polythene bags are dangerous because they are non-biodegradable.
  • It takes thousands of years for its natural biodegradation.
  • It makes the soil less fertile when thrown on land.
  • When thrown in water it chokes  ponds, rivers and oceans. It harms the sea life.
  • If animals eat plastic, it gets stuck in their stomach. It makes them sick, because the bacteria in their stomach cannot break the plastic into smaller pieces.
Answered by Prachi Sawant | 12 Dec, 2013, 06:34: PM

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CBSE 12-science - Chemistry
A polymer sample contains 30%(by weight) of chains with molecular weight 10000, 30%(by weight) of the chains with molecular weight 20000, and the rest of chains with molecular weight 30000. Calculate the number average and weight average molecular weight of the sample.
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