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Title ¼ÐÃD |
Content ¤º®e |
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(1) |
A.Fung ªº¤Æ¾Ç«Å¨¥ |
¤ù¬qÅã¥ÜA.Fung¹ï¤Æ¾Çªº¼ö¸Û |
1.10M |
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(2) |
Sodium ¶u + water ¤ô |
Na floats and moves around on the surface of water. Heat and colorless gas are given out. ¶u¯B¦b¤ô±¨Ã¥|³B²¾°Ê¡C¦³¼ö¤ÎµL¦â®ðÅé¥Í¦¨¡C 2 Na + 2 H2O
à
2 NaOH + H2 |
4.68M |
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(3) |
Test for hydrogen ²Bªº´ú¸Õ |
Hydrogen
gas gives a ¡¥pop¡¦ sound with a burning splint. ²B®ð©M¿U¿N¤¤¤ì±øµo¥X¡u¼P¡vÁn¡C 2 H2 + O2 à 2 H2O |
0.90M |
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(4) |
Test for oxygen ®ñªº´ú¸Õ |
Oxygen gas can relight a glowing splint. ®ñ®ð¥i«¿U¦³¾lÂuªº¤ì±ø¡C |
0.73 M |
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(5) |
Test for water ¤ôªº´ú¸Õ |
Water can turn dry cobalt(II) chloride paper from blue to pale pink. ¤ô¥i§â°®Àꪺ´â¤Æ¹W(II)¸Õ¯È¥ÑÂŦâÅܦ¨¯»¬õ¦â¡C |
2.44 M |
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(6) |
Coins + conc. nitric acid µw¹ô + ¿@µv»Ä |
The coins dissolve in conc. nitric acid to form greenish- blue solution and brown gas. µw¹ô·»©ó¿@µv»Ä(HNO3)¡A§Î¦¨ºñÂŦⷻ²G¤Î ´Ä¦â®ðÅé¡C
Cu + 4 H+ + 2 NO3¡Ð à Cu2+ + 2 NO2 + 2 H2O |
5.50M |
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(7) |
Alkene ²m + KMnO4 / H+ |
Alkene can turn acidified potassium permanganate solution from purple to colorless. ²mÖL¥i§â»Ä¤Æ°ª¿ø»Ä¹[¥Ñµµ¦âÅܦ¨µL¦â¡C
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4.70M |
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(8) |
Burning magnesium ¿NÁâ |
Mg burns with bright white flame. White solid is formed. Mg¿U¿N®É²£¥Í±j¯Pªº¥Õ¥ú¡C¦³¥Õ¦â©TÅé¥Í¦¨¡C
2 Mg + O2 à 2 MgO |
3.04M |
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(9) |
2001¦~¨÷¤@²Ä4ÃD Sodium + oil & water ¶u + ªo©M¤ô |
Na + oil ªo à no
reaction ¨S¦³¤ÏÀ³ 2 Na + 2 H2O
à
2 NaOH + H2 NaOH(alkaline) + phenolphthalein à pink color NaOH(ÆP©Ê)
+ ×ô¨»¤Ó à ¯»¬õ¦â |
4.20M |
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(10) |
Magnesium + steam Áâ + ¤ô»]®ð |
Mg metal turns white. Colorless gas is given out. MgÅܦ¨¥Õ¦â¡C¦³µL¦â®ðÅé©ñ¥X¡C
Mg (s)
+ H2O (g) à MgO (s) + H2 (g) |
4.37M |
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(11) |
Zinc + copper(II) sulphate ¾N + ²¸»Ä»É(II) |
Displacement reaction ¸m´«¤ÏÀ³¡G Zn + CuSO4 à
ZnSO4 + Cu Blue solution turns pale blue. Brown solution is formed. ·»²G¥ÑÂŦâÅܦ¨²LÂŦâ¡C¦³´Ä¦â©TÅé¥Í¦¨¡C Cu + ZnSO4 à
no reaction ¨S¦³¤ÏÀ³ |
4.62M |
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(12) |
Iron(II) ion + rust indicator ÅK(II)Â÷¤l + ÅKù׫ü¥Ü¾¯ |
A blue compound is formed. ¥Í¦¨ÂÅ¦â¤Æ¦Xª«¡C |
2.02M |
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(13) |
Mg-Cu chemical cell Áâ-»É¤Æ¾Ç¹q¦À |
Magnesium is more reactive than copper. Mg loses electrons. Mg is negative pole of the cell (anode). Cu is positive pole of the cell (cathode). Áâ¤ñ»É¬¡¼â¡CÁâ©ñ¹q¤l¡C Áâ¬O¹q¦Àªºt·¥(¶§·¥)¡C»É¬O¹q¦Àªº¥¿·¥(³±·¥)¡C |
2.79M |
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(14) |
CO2 fire extinguisher ¤G®ñ¤ÆºÒ·À¤õ¾¹ |
Carbon dioxide gas is denser than air. CO2 removes oxygen out of the burning object. ¤G®ñ¤ÆºÒ«©óªÅ®ð¡CCO2¥h°£¿U¿Nª«ªþªñªº®ñ¡C |
3.22M |
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(15) |
Electrolysis of concentrated potassium iodide solution ¹q¸Ñ¿@¸K¤Æ¹[·»²G |
+ electrode·¥(anode¶§·¥)¡G 2 I¡Ð à I2 + 2 e¡Ð Brown color is seen. ¦³´Ä¦âª«½è¥X²{¡C - electrode·¥(cathode³±·¥)¡G 2 H+ + 2 e¡Ð à H2 Colorless gas is formed. ©ñ¥XµL¦â®ðÅé¡C |
4.33M |
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(16) |
Potassium ¹[ + water ¤ô |
K floats and burns with a lilac flame. K moves around on the surface of water. Heat and colorless gas are given out. ¹[¯B¦b¤ô±¡A¿U¿N®É²£¥Í²Hµµ¦â¤õ¿V¡C ¹[¦b¤ô±¥|³B²¾°Ê¡C¦³¼ö¤ÎµL¦â®ðÅé¥Í¦¨¡C 2 K + 2 H2O
à
2 KOH + H2 |
3.54M |
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(17) |
Burning sodium¿N¶u |
Sodium burns with a golden yellow flame. ¶u¿U¿N®É²£¥Íª÷¶À¦â¤õ¿V¡C 4 Na + O2 à 2 Na2O |
2.80M |
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(18) |
Copper + silver nitrate »É + µv»Ä»È |
Displacement
reaction ¸m´«¤ÏÀ³¡G Cu
+ 2 AgNO3 à Cu(NO3)2 + 2 Ag Colorless solution turns blue. Silvery solid is formed. ·»²G¥ÑµL¦âÅܦ¨ÂŦâ¡C¦³»È¦â©TÅé¥Í¦¨¡C Ag
+ CuSO4 à no reaction ¨S¦³¤ÏÀ³ |
5.78M |
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(19) |
Reduction of silver oxide by strong heating §Q¥Î±j¼ö§â®ñ¤Æ»ÈÁÙì |
Black solid (Ag2O) turns silvery (Ag). Colorless gas (O2) is evolved which can relight a glowing splint. 2 Ag2O à 4 Ag + O2 ¶Â¦â©TÅé(Ag2O)Åܦ¨»È¦â(Ag)¡C ¦³µL¦â®ðÅé(O2)©ñ¥X¡A¥¦¥i«¿U¦³¾lÂu¤ì±ø¡C |
7.26M |
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(20) |
Zn-Cu chemical cell ¾N-»É¤Æ¾Ç¹q¦À |
Zinc is more reactive than copper. Zn loses electrons. Zn is negative pole of the cell (anode). Cu is positive pole of the cell (cathode). ¾N¤ñ»É¬¡¼â¡C¾N©ñ¹q¤l¡C ¾N¬O¹q¦Àªºt·¥(¶§·¥)¡C»É¬O¹q¦Àªº¥¿·¥(³±·¥)¡C |
2.75M |
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(21) |
Chemical cell¤Æ¾Ç¹q¦À KI - KMnO4 / H+ |
Anode(- pole), lose electrons¡G 2 I¡Ð à I2 + 2 e¡Ð ¶§·¥(t·¥),©ñ¹q¤l Colorless solution turns brown. ·»²G¥ÑµL¦âÅܴĦâ¡C Cathode(+ pole), gain electrons³±·¥(¥¿·¥),¨ú¹q¤l¡G MnO4¡Ð + 8 H+
+ 5 e¡Ð à
Mn2+ + 4 H2O Purple solution turns colorless finally. ·»²G³Ì²×¥Ñµµ¦âÅܵL¦â¡C |
3.47M |
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(22) |
Electrolysis of silver nitrate solution ¹q¸Ñµv»Ä»È·»²G |
+ electrode·¥(anode¶§·¥)¡G 4 OH¡Ðà O2 + 2 H2O + 4 e¡Ð Colorless bubbles are formed.¦³µL¦â®ðÅé¥Í¦¨¡C - electrode·¥(cathode³±·¥)¡G Ag+ + e¡Ðà Ag Silvery solid is formed. ¥Í¦¨»È¦â©TÅé¡C |
4.93M |
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(23) |
Electrolysis of dilute sulphuric acid using copper metal as positive electrode ¹q¸Ñµ}²¸»Ä¡A ¥Î»Éª÷Äݧ@¬°¥¿·¥ |
+
electrode·¥(anode¶§·¥)¡G Cu à Cu2+ + 2 e¡Ð Copper dissolves. Colorless solution turn |