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  1. 1. we only need to heat a small object such as test tube or beaker. so we do not need a gas stove. 2. there may be some liquid spilling out during heating...

    分類:科學及數學 > 化學 2008年05月31日

  2. ...an arrow to show the last reaction 2D + 2E → H. You do not need to double Its reaction heat ΔH3 beause this reaction is exactly...

    分類:科學及數學 > 化學 2011年02月01日

  3. ... sink in water, obviously iron has higer density than water. You do not need any figure to support the fact. 3. Any metal, eg. iron, aluminum. Hig thermal...

    分類:科學及數學 > 化學 2007年08月25日

  4. ...cellulose. However, sometimes the visual quality of the final paper product does not need to be very light in color, so these paper products are made from...

    分類:科學及數學 > 化學 2010年03月07日

  5. ...extremely intense exothermic reaction between Al & Fe2O3 and this does not need any oxygen from air. This is nothing relate to the match (火柴) ...

    分類:科學及數學 > 化學 2007年05月07日

  6. ...since sulphonic acids are quite strong, it dissociate readily in water they do not need to be in a alkaline medium to make it become an anion

    分類:科學及數學 > 化學 2007年04月24日

  7. ...29 12:18:30 補充: Na+ will be stayed in the salt bridge if they do not need to be used to balance the charge of solutions. 2010-12-29 12:40:46...

    分類:科學及數學 > 化學 2010年12月29日

  8. ... also insoluble in water, but they would react with acid to dissolve. So you need to acidified it to ensure the precipitate formed are silver chloride but not other silver compounds.

    分類:科學及數學 > 化學 2008年01月18日

  9. ...of carbon dioxide. Notice that the number of moles does not need to balance on either side of the equation. This is because a mole ...

    分類:科學及數學 > 化學 2007年03月18日

  10. ...thermite, mixture of iron(III) oxide and aluminium, burns vigorously ( not needing oxygen) to form molten iron. it's used in welding rails in...

    分類:科學及數學 > 化學 2011年02月09日