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Questions in Science tagged with "chemistry"

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  Describe the pattern shown by the results below?

  Posted by ibbyszzzzzzzzzzz786 on Dec 31, 2009 at 07:53 PM

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  Comment on the effectiveness of Thin-layer Chromatography (TLC) as a technique to separate mixtures of biological molecules.

  Posted by ibbyszzzzzzzzzz786 on Dec 30, 2009 at 11:20 AM

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  Describe the pattern shown by the results below?

  Posted by ibbyszzzzzzzzz786 on Dec 30, 2009 at 11:02 AM

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  What is the literature value of chlorine (Cl) concentration (g dm3) of seawater from the Indian Ocean and the South China Sea?

  Posted by generalyin on Dec 17, 2009 at 01:02 AM

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  Given that you have 14.5 moles of N2, how many moles of H2 are need to produce 22.5 moles of NH3 according to the reaction:  N2+ 3 H2 yields 2 NH3?

  Posted by gbrlrosa on Dec 14, 2009 at 06:11 PM

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  Why is it impossible to write a net ionic equation for any mixtures that did not form a precipitate?

  Posted by xkevinix on Dec 10, 2009 at 08:05 PM

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  Evaluate the experiment below, identifying energy loss and errors, and access their effect on the efficiency?

  Posted by greg786 on Dec 9, 2009 at 07:14 PM

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  How much heat is necessary to melt 175.32 g of NaCl at 801 degree Celsius? (heat of fusion NaCl=28.16 kJ/mol)  

  Posted by dandelion125 on Dec 8, 2009 at 07:48 PM

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  What is a helix?

  Posted by animallover on Dec 7, 2009 at 05:42 PM

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  Why is it that most soft drinks such as Coke, Pepsi, and Sprite contain fructose instead of glucose?

  Posted by catlover on Dec 7, 2009 at 05:40 PM

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  Why is the term "dehydrogenation" appropriate for the following defintion?

  Posted by catlover on Dec 2, 2009 at 08:11 PM

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  What reaction is taking place for the following situation?

  Posted by animallover on Dec 2, 2009 at 06:57 PM

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  Will table salt bond with ethane and why or why not?

  Posted by catlover on Nov 24, 2009 at 06:27 PM

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  What is pH?

  Posted by animallover on Nov 24, 2009 at 06:01 PM

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  What are some ways to remember the following terms?

  Posted by dogcrazy on Nov 22, 2009 at 07:56 AM

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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