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  1. ...flame. (ii) P: sodium Q: Calcium b) P reacts with air readily. c) (i) 1) P melts to form a silvery ball. 2) It moves quickly on the water surface with a ...

    分類:科學及數學 > 化學 2015年06月16日

  2. ...⁻) = -6 The O.N. of Cr changes from +3 to +6. ===== Q2) To know the O.N. of Fe, you must know...

    分類:科學及數學 > 化學 2014年08月20日

  3. ... or metal hydrogencarbonates to give carbon dioxidegas. • Neutralize with metal... a weak reducing agent, but NOT an oxidizing agent. 2014-08-05 14:19:34 補充: 補充...

    分類:科學及數學 > 化學 2014年08月07日

  4. ...change Fermentation of glucose gives ethanol and carbon dioxide. Hence...chemical change Explosion is an extremely rapid burning. (All... butter changes to solid butter. No new substance ...

    分類:科學及數學 > 化學 2013年10月10日

  5. ... 4ic) Milk turns sour due to reaction with oxygen, or by micro-organisms微生物so chemical...and oxygen atoms so CO2 is NOT an element. The atoms are held by...

    分類:科學及數學 > 化學 2013年09月22日

  6. ... with oxygen in air . (2) is correct because...1 because the ability of carbon to form mutiple bond with other...quot;The ability of an element to catenate is...volume of carbon dioxide is given out, it shows that the...

    分類:科學及數學 > 化學 2013年03月17日

  7. ...renewable fuel, and it will be used up soon. Burning petroleum causes air pollution, and conserve petroleum can thus reduceair pollution. (i) bitumen It can be...

    分類:科學及數學 > 化學 2012年08月31日

  8. ...upward delivery (downward displacementof air ) or using a syringe... is used to dry NH3 gas. d) ...(OH)2solution to give NH3 gas. However... is because an insoluble layer of calcium carbonate...

    分類:科學及數學 > 化學 2012年08月09日

  9. ...144.5 = 0.00692 mole From the equation, 3 moles of fuel mixture can give an energy of 2680 kJ and hence 1 g can give : 0.00692 x 2680/3 = 6.18 kJ 2) Vol. of air in house = 275 x 2.5 = 687.5 m3 Using PV = nRT, no. of ...

    分類:科學及數學 > 化學 2012年04月13日

  10. 1. because nitric acid do not have enough oxidizing power to oxidize gold.gold can react with halogen(very high oxidizing...qid=7006110603635 5.Concentrate something means to increase the concentration of solute=decrease the concentration of solute...

    分類:科學及數學 > 化學 2012年04月10日