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  1. ...concentration of HCl is kept for for both cases, so one needs not to consider this. surface area... did you notice the mass ratio of A to...

    分類:科學及數學 > 化學 2012年03月04日

  2. ... need heat to start then off. All changes to Some Not all chemical reactions need heat to start, for instance, reaction of group 1 elements with water.

    分類:科學及數學 > 化學 2010年11月18日

  3. ...reversal of hydrolysis) in hair. These make the hair lost of shinny and not smooth. Thus, we add conditioner to neutralize sort of reactions and therefore...

    分類:科學及數學 > 化學 2007年01月27日

  4. Blackbroad chalk is Calcium Sulphate CaSO4 not CaCO3 . You need to redesign your experiments !

    分類:科學及數學 > 化學 2009年10月25日

  5. ...' movement. when they were cooled the praticles will not be as active as it is heated up. and some how they move slowly. the potential...

    分類:科學及數學 > 化學 2007年01月21日

  6. In order to make a water filter, you need to list things appropriate in an order of size. (Decreasing in size...

    分類:科學及數學 > 化學 2008年07月01日

  7. in fact, the reaction is as simple as that, need not too much details to describe. for aldehydes (except ethanal and methanal...

    分類:科學及數學 > 化學 2011年03月17日

  8. Firstly, iodine is the safest one among the halogens. Fluorine is extremely reactive and can even react with water (in our body). Chlorine is poisonous. Bromine vapour is very toxic and corrosive...

    分類:科學及數學 > 化學 2007年10月06日

  9. ...between the molecule. Stronger the intermolecular force, more heat need to supply to breask the bond and melt it. Take propanone...will have similar melting poing and the melting point cannot use ti identify them

    分類:科學及數學 > 化學 2010年11月05日