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  1. ZnO is white when cold but turns yellow on heating . It returns to white when on cooling. The same situation for lead(II)oxide. These...

    分類:科學及數學 > 化學 2007年09月23日

  2. When heating , the metal nitrate dissolves in its water of crystallization...without decomposition. Then, the metal nitrate decomposes when it is heated to the temperature of decomposition.. =

    分類:科學及數學 > 化學 2009年01月21日

  3. 1. A silvery space suit helps to reflect radiant heat when under solar radiation. At places of darkness... heated by an electric current. The heated oil causes convection of the air surrounding...

  4. ...the surroundings. Besides, the inside of freezers arepainted white , it is to reduce heat gain from the surroundings as white is apoor absorber of heat . 4...

  5. On heating the mixture of magnesium powder and black copper(II) oxide, white magnesium oxide is formed with brown bits of copper: 圖片參考...

  6. ...well, then add in sugar and cornstarch;using electric beater,beat mixture until creamy white . Heat milk over low heat till it reaches 60C.Pour milk into egg mixture...

  7. ... general, black coloured objects have higher emissivity than white coloured objects. Thus black coloured objects...

  8. ...emitter of heat , this helps heat from the refrigerant to dissipate much rapidly. 3.(a) White surface is a bad absorber of heat and a bad emitter of heat . Hence, the body temperature of the astronaut could be...

  9. ... with oxygen exothermically to produce an intense white light. since red phosphorus has a relatively large molecular...it will react with oxygen to produce an oxide without strong heating . 2008-05-17 13:12:38 補充: There are...

    分類:科學及數學 > 化學 2008年05月20日

  10. ...well, then add in sugar and cornstarch;using electric beater,beat mixture until creamy white . 2. Heat milk over low heat till it reaches 60C.Pour milk into egg mixture...

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