The react to form zinc sterate and water
Yes
there are no changes because the metal has already reacted with oxygen to form a metal oxide reaction is done.
A reaction between an acid and a metal oxide to form a salt and water as the only products.
Yes copper oxide reacts with hydrochloric acid and it forms a blue green compound.
the ferrous oxide is desolved. and turned in to ferrous hydroxide.
Nothing happens. They don't react.
Nitric acid is oxidizing acid. When it reacts with iron it forms a protective layer of iron oxide over it. So it does not react further.
Metals whose surfaces are "passivated" by for example the formation of an insoluble oxide do not react with acid. An example is aluminium which is resistant to dilute acid.
Magnesium Sulfate
Gold does not react directly with oxygen, however if you succeed in getting gold oxide indirectly, it decomposes at 205C. The oxide is neither acid nor base however gold ions are acidic (like protons are acidic)
Yes, they react tor form water and the corresponding potassium carboxylate salt.
Magnesium carbonate (MgCO3)Explanation:Magnesium oxide is a basic oxide. A property of basic oxides is that they react with acid to form salt and water. Soda water contains an acid called carbonic acid. Magnesium oxide can react with carbonic acid to form magnesium carbonate as shown in the equation below:MgO(s) + H2CO3(aq) --> MgCO3(aq) + H2O(l)