Q1. 碳粉為何能提升導電能力? (用在電池)
Q2. anhydrous calcium chloride 有咩用? 吸水定吸氧氣?
Q3. ammunium chloride 是否 covalent compound?
Q4. potassium permanganate 同 potassium dichromate 用作氧化劑時為何要
in acidic solution?
Q5. copper(2) chloride 同 potassium hydroxide
copper(2) sulphate 同 sodium carbonate
lead(2) nitrate 同 sodium sulphate
點解會有反應? 又唔係displacement。我好唔明。
Q2請提供equation解釋。
Chem 數問
2008-08-25 7:27 pm
回答 (2)
2008-08-28 7:15 pm
✔ 最佳答案
Q5. Because precipitate is formed in each reactioncopper(2) chloride 同 potassium hydroxide ---> Cu(OH)2 (s) insoluble in water
copper(2) sulphate 同 sodium carbonate-----> CuCO3(s) insoluble in water
lead(2) nitrate 同 sodium sulphate------> PbSO4 (s) insoluble in water.
2008-08-26 9:04 pm
Q1 碳粉可以係電池入面幫手傳ELECTRONS
Q2 吸水...佢吸D 水 form water of crystallization
equation 應該係:CaCl2+nH2O----->CaCl2．nH2O N係幾多我唔知- -
Q3 ammonium chloride 係ionic bond ..cation:NH4+ anion:Cl-
Q4 佢地做reduction 個陣...要involve H+ ions.. 所以要用acid 入面d H+ ions
Q5 我ar sir 話..其實係大家交換左個partner
Q2 吸水...佢吸D 水 form water of crystallization
equation 應該係:CaCl2+nH2O----->CaCl2．nH2O N係幾多我唔知- -
Q3 ammonium chloride 係ionic bond ..cation:NH4+ anion:Cl-
Q4 佢地做reduction 個陣...要involve H+ ions.. 所以要用acid 入面d H+ ions
Q5 我ar sir 話..其實係大家交換左個partner
收錄日期: 2021-04-15 14:37:59
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