2條Chem pls help

Halo

2010-09-03 5:45 am

1. Rainwater is not neutral in terms of pH Explain why rains might be a concern of erosion. Write relvant equations to support your argument. 2. the reactivity of 3 metals in ascending order Y<X<Zto further investigate their properties an expeirement was conduct to decompose their metal oxides and test any gas produced accordingly draw a labelled diagram to show expirment set-up.

~thx for yur help~

回答 (1)

[匿名]

2010-09-05 2:13 am

✔ 最佳答案

1)) normal rain water cintains dissolved CO2, forming carbonic acid
CO2 (g) + H2O(l) Õ H2CO3 (aq)
acid rain will consists of dissolved sulphur dioxide, forming sulphuric acid, sulpurous acids,
SO2 (g) + H2O(l) Õ H2SO3 (aq)
H2SO3 (aq) + O‧Õ H2SO4 (aq)
nitrogen dioxides , forming Nitrous acid and Nitric acid
NO(g) + O‧Õ NO2 (g) [NO reacts with oxygen radical in air to form NO2
2NO2 (g) + H2O (l) Õ HNO3 (aq) + HNO2(aq

erosion of marbles structures (contain CaCO3) MEANS THERE is reaction between CO3^(-2) and H^+

2) obtain if heated directly: least reactive
picture:
http://www.yenka.com/content/item.action?quick=20k
obtain if by carbon reduction: more reactive
picture:
http://www.yenka.com/content/item.action?quick=1gy

cannot obtain through the above mothod: most reactive

參考: myself

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