Question

Допишите возможные уравнения реакций : K + HCl= CA + HBr= Hg + H2So4= Если реакция невозможна, объясните почему.

Answer 1

2K + 2HCl = 2KCl + H2

Ca + 2HBr = CaBr2 + H2

Hg + 2H2SO4 = HgSO4 + 2H2O + SO2

Answer 2

K + HCl = KCl + H2

Explanation: This is a single displacement reaction. Potassium (K) displaces hydrogen (H) from hydrochloric acid (HCl) to form potassium chloride (KCl) and hydrogen gas (H2).

Ca + HBr = CaBr2 + H2

Explanation: This is also a single displacement reaction. Calcium (Ca) displaces hydrogen (H) from hydrogen bromide (HBr) to form calcium bromide (CaBr2) and hydrogen gas (H2).

Hg + H2SO4 = HgSO4 + H2

Explanation: This is a double displacement reaction. Mercury (Hg) reacts with sulfuric acid (H2SO4) to form mercury(II) sulfate (HgSO4) and hydrogen gas (H2).

All of the given reactions are possible and will proceed as described above. The reactions involve the exchange of elements to form new compounds and release hydrogen gas as a product in each case.