3條chem問題,答重點就得...唔該

2007-12-21 4:08 am

1.Imagine you were on the Moon. Suggest why you could not find any living things there.
2.In the chlor-alkali industry, brine, but not sea water, is electrolysed. Explain why.
3.Write a word equation for the reaction between chalk and dilute nitric acid.

回答 (2)

勇

2007-12-21 4:38 am

✔ 最佳答案

第一題有人答左

第二題我諗係因為brine係指concentration o既NaCl....
而sea water就係dulite家la....而家係 chlor-alkali industry...即係要整Cl....
由於brine 進行electrolysis會出Cl2同H2...但sea water只會出O2 同H2

第三題chalk即係calcium carbonate CaCO3

CaCO3+2HNO3---->CO2+H2O+Ca(NO3)2

而家係H^+ + CO3^2-
係acid o既一種性質!!

希望無錯!

2007-12-20 21:15:32 補充：
第二題如果係sea water...入面有Na ,Cl - , OH- , H 根據DISCHARGE O既次序係OH-同H 出先....會變O2同H2但由於CONCENTRATION會影響放電次序..而Cl- 同OH- o既位置好近...所以會出Cl2第三題acid HCO3^ - or CO3^2- 都會出CO2同H2O

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屎忽神

2007-12-21 4:19 am

1. there is no air so no living things there
2. 唔識
3. 唔識

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