HKCEE chem03 LQ 9a(iii)
In an experiment, a piece of brass(copper and zinc compound) is added to a test tube containing 2M nitric acid.
State TWO observations in the experiment and write the relevant chemical equation(s).
observations無論dilute定conc都係
1)brown gas form 2)solution change to blue in colour
但equation寫咩?
dilute既...先出NO再同O2 react出NO2
conc既...直接就出NO2
呢條係dilute定conc?