1. Which of the following substances,when mixed will undergo a chemical reaction?
(1)calcium and water
(2) Bromine water and sodium chloride solution
(3) Zinc nitrate solution and dilute sodium hydroxide solution
ans : 1 and 3 點解2 唔岩??
2.Which of the following methods can help to control the pollution from the electroplating industry?
1. Use less water to rinse electroplated
呢個點解岩ge??
plz explain thz~~~
Chem 高手請答~~
2007-06-18 2:00 am
回答 (1)
2007-06-18 7:44 am
✔ 最佳答案
1 (1) Ca + H2O --> Ca(OH)2 + H2(2) Br(aq) + NaCl(aq) === No Reaction ===
because Br is a weaker oxidizing agent than Cl
(3) Zn2+ +2OH- --> Zn(OH)2
Alkali acting on metal ions
2 Perhaps it focuses on thet volume of the pollutants...
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一個GAG，就好似一杯凍檸茶一樣，愈督愈"爛"，愈(攪)搞愈凍...
收錄日期: 2021-04-13 00:38:24
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