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Questions in Science tagged with "chemistry"

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  What structural feature usually needs to be present in order for an addition polymer to be produced?  

  Posted by teatime10 on Nov 18, 2009 at 06:23 PM

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  What is the essential feature that a molecule must have in order to it be involved in the formation of a condensation polymer? 

  Posted by summer10 on Nov 18, 2009 at 06:20 PM

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    Polyethylene (polyethene) has which of the following monomers?   CH2   C2H4   CH4   C2H6

  Posted by kungfufu on Nov 18, 2009 at 06:17 PM

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  In another sample of polyethlene, the molecules contain on average, 450 monomer units. What is the molar mass of the polymer?

  Posted by feder12 on Nov 18, 2009 at 06:12 PM

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  A sample of polyethene has an average molar mass of 84500 g mol-1.

  Posted by nadal2sc on Nov 18, 2009 at 06:09 PM

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  You will have read that proteins are polypeptides composed of large numbers of amino acids linked together.

  Posted by jenny101 on Nov 18, 2009 at 05:51 PM

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  You will have also read that the carbohydrate polymers starch and cellulose are composed of glucose molecules.

  Posted by lee100 on Nov 18, 2009 at 05:44 PM

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  In conducting an experiment to obtain the graphs, a few variables must kept constant. What are these variables and explain why.

  Posted by new-lifestyle on Nov 14, 2009 at 02:36 PM

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  Does anyone have information on industrial chemistry? In urgent need of assistance

  Posted by mballaz on Nov 14, 2009 at 02:33 PM

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  What are the Endocrine glands and what are their purpose?

  Posted by valenjenkins on Oct 21, 2009 at 04:12 AM

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  What is blood made up of?

  Posted by hbzuk on Oct 21, 2009 at 02:42 AM

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  What substances are in mascara?

  Posted by billybobjoe5000 on Sep 22, 2009 at 10:57 AM

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  What is the mole in chemistry and what are some common household objects that have mole?

  Posted by shortieash on Sep 20, 2009 at 04:20 PM

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  What is the ion in sulphuric acid which causes it to be acidic?

  Posted by sandali on Sep 17, 2009 at 05:52 AM

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  What makes one liquid denser than another if they have equal mass?

  Posted by vyfhuis on Sep 13, 2009 at 04:04 PM

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  If you have 3 liquids *unknown* how do you find which is the most dense, mid dense and least dense using nothing but the liquids, a cup and a straw?

  Posted by abdelrahman on Sep 9, 2009 at 05:15 PM

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  what is otto-hoffman's by-porduct oven explane with there construction ,working ,net labeled digram? 

  Posted by lovewe on Aug 25, 2009 at 11:18 PM

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  Does a solid, liquid or gas expand/contract faster?

  Posted by angel-girl on Jul 26, 2009 at 07:26 PM

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  A mixtureof hydrogen&chlorine occupying36cc was exploded.On shaking itwith water4cc of hydrogen wasleft behind.Find the composition of the mixture

  Posted by itssnigdha on Jul 15, 2009 at 09:49 AM

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  2500cm cube of hydrogen at S.T.P.  subjected to 2 and half times increase in pressure. What volume will hydrogen now occupy?

  Posted by cherrybhatnagar on Jul 8, 2009 at 09:22 AM