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  1. ...knowledge in higher studies is not need ; however it'd be good if you can take a look into... the number of drops of acid needed to turn the solution from yellow to red. This...

    分類:科學及數學 > 化學 2015年03月06日

  2. ... if you find the ores of silver and mercury is pure, you do not need to extract them. However, when ores contain mercury oxide, for...

    分類:科學及數學 > 化學 2010年09月04日

  3. ...condition, pressure and it won't decompose when light occur so it is no need to keep it in brown bottle. 2. HNO3 is a strong oxdizing agent, especially...

    分類:科學及數學 > 化學 2007年03月23日

  4. ... exist under room pressure; for iodine to liquefy, additional pressurization is NOT needed . First, do you know evaporation? Liquid not reaching ...

    分類:科學及數學 > 化學 2012年05月16日

  5. It dose not change the no.of moles of solution in the conical flask,which uses up the same amount of titrant whether it is dried or not .

    分類:科學及數學 > 化學 2011年03月31日

  6. ... concentration (of the solute). ========== (c) This titration does NOT need an indicator. When KMnO4 solution is added to solution...

    分類:科學及數學 > 化學 2008年06月03日

  7. In ozonlysis, an alkene is firstly treated with ozone to form an ozonide intermediate, and different products can be obtained by different work-up, i.e. treating the ozonide intermediate with different reagents. I think you are asking...

    分類:科學及數學 > 化學 2010年02月26日

  8. ...can find it in your test book and you should remember all these equation(you do not need to remember the balanced equation,you just need to remember the basic one.) eg...

    分類:科學及數學 > 化學 2011年11月22日

  9. ionization = remove or add electrons to atoms into ions. dissociation = speration of atoms within ionic compounds. The difference is dissociation does not need as much energy as ionization. I hope I helped.

    分類:科學及數學 > 化學 2008年08月24日

  10. ...acid is used as a catalyst. The other three reactions do not need any catalyst. 2: The answer is A. Cracking (A...

    分類:科學及數學 > 化學 2009年03月27日