F.5 CHEM 問題..唔係好明....你地應該明架,幫下我,thx

你的問題不清楚,我只好猜測你問些什麼.
nitric acid係唔係只係同copper react先會 cu^2+ + h2so4-->cuso4 +so2+h2o(oxidizing agent). Ans: For nitric acid, its concentration should be smaller than 0.1M, if you want to have H2 gas released. When its concentration is 6M to 8M, the reaction gives NO gas instead. When its concentration is 12M to 16M, the reaction gives NO2 gas instead. It is a must to state that only 2M H2 SO4 will not react with Cu, since the electrochemical series of Cu is lower than that of H2. However, concentrated H2 SO4 (6M) can react with Cu and give SO2 will react with Cu.

如果同其他metal 好似magnesium反應出acid porperty? Ans: I am not sure whether the acid property of nitric acid you refer is giving H2 gas or not. If yes, as the above stated, for nitric acid only the very dilute one of about 0.05M to 0.1M can give H2 gas when reacts with metals. For H2 SO4 ,only 2 M one will not reacts with metals. Both 0.05M to 0.1M nitric acid and 2M H2SO4 ,will not react with Cu . When they are concentrated one, however, they do.只有濃的 nitric acaid及濃的H2SO4才可以與銅或比銅更低的電化次序的金屬反應,當然,它們也可以和鎂或鋁反應,但是在濃的時候,出來的氣體是NO2 及 SO2 而不是H2了.但是無論是濃或稀,它們都有酸的特性,因為它們均可以與鹼反應[中和反應]及當它們溶於水時可以放出H+離子.

咁佢concentration nitric acid同dilute nitric acid有冇分別? Ans: Only conc. H2SO4 can react with Cu which has the property the same as concentration nitric acid. (i.e. Both acting as an oxidizing agent giving NO2 and SO2 gas(es) when reacting with metals respectively.) For dilute nitric acid with (6M-8M), it is also an oxidizing agent having the same property as conc.H2SO4 able to oxidize metal and give NO gas instead of H2 gas. It reacts with Cu as well.

另外concentration sulphuric acid同dilute係唔係都可以add 係acid property? For conc. H2SO4 , it has both oxidizing property and acid property. For acid property, it can react with alkali (H2SO4 + NaOH→Na2SO4+ H2O) and give H+ ions when dissolves in water. ( H2SO4 + H2O→HSO4-+ H3O+).Hence its pH value is low.
係唔係sulpur dioxide add at oxidizing agent in copper only in concentration?如果汞,銀金果d呢?.唔明你問什麼,但是在用濃的H2SO4時,只有金不會和它反應的.
I hope you will find them helpful.