Questions: Câu 1. Cho các cặp chất sau: a) Zn+HCl b) Cu+ZnSO4 c) Fe+CuSO4 d) Zn+Pb(NO3)2 e) Cu+HCl g) Ag+H2SO4 loãng h) Ag+CuSO4 i) Ba+H2O k) Mg+O2 1) Cu+H2O m) Ag+O2 n) Fe+Cl2 Nhưng cặp chất nào xảy ra phản ứng? Viết các phương trình hóa học xảy ra.

Solution Steps

To determine which pairs of substances will react, we need to consider the reactivity of the metals involved and the nature of the reactions:

• a) \(\mathrm{Zn} + \mathrm{HCl}\): Zinc is more reactive than hydrogen and will react with hydrochloric acid to produce hydrogen gas and zinc chloride.
• b) \(\mathrm{Cu} + \mathrm{ZnSO}_{4}\): Copper is less reactive than zinc, so no reaction will occur.
• c) \(\mathrm{Fe} + \mathrm{CuSO}_{4}\): Iron is more reactive than copper and will displace copper from copper(II) sulfate to form iron(II) sulfate and copper.
• d) \(\mathrm{Zn} + \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}\): Zinc is more reactive than lead and will displace lead from lead(II) nitrate to form zinc nitrate and lead.
• e) \(\mathrm{Cu} + \mathrm{HCl}\): Copper does not react with hydrochloric acid because it is less reactive than hydrogen.
• g) \(\mathrm{Ag} + \mathrm{H}_{2} \mathrm{SO}_{4}\) (dilute): Silver does not react with dilute sulfuric acid.
• h) \(\mathrm{Ag} + \mathrm{CuSO}_{4}\): Silver is less reactive than copper, so no reaction will occur.
• i) \(\mathrm{Ba} + \mathrm{H}_{2} \mathrm{O}\): Barium reacts with water to produce barium hydroxide and hydrogen gas.
• k) \(\mathrm{Mg} + \mathrm{O}_{2}\): Magnesium reacts with oxygen to form magnesium oxide.
• l) \(\mathrm{Cu} + \mathrm{H}_{2} \mathrm{O}\): Copper does not react with water.
• m) \(\mathrm{Ag} + \mathrm{O}_{2}\): Silver does not react with oxygen under normal conditions.
• n) \(\mathrm{Fe} + \mathrm{Cl}_{2}\): Iron reacts with chlorine to form iron(III) chloride.

For the reactions that occur, we write the balanced chemical equations:

• a) \(\mathrm{Zn} + \mathrm{HCl}\): \[ \mathrm{Zn} + 2\mathrm{HCl} \rightarrow \mathrm{ZnCl}_2 + \mathrm{H}_2 \uparrow \]

• c) \(\mathrm{Fe} + \mathrm{CuSO}_{4}\): \[ \mathrm{Fe} + \mathrm{CuSO}_4 \rightarrow \mathrm{FeSO}_4 + \mathrm{Cu} \]

• d) \(\mathrm{Zn} + \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}\): \[ \mathrm{Zn} + \mathrm{Pb(NO}_3)_2 \rightarrow \mathrm{Zn(NO}_3)_2 + \mathrm{Pb} \]

• i) \(\mathrm{Ba} + \mathrm{H}_{2} \mathrm{O}\): \[ \mathrm{Ba} + 2\mathrm{H}_2\mathrm{O} \rightarrow \mathrm{Ba(OH)}_2 + \mathrm{H}_2 \uparrow \]

• k) \(\mathrm{Mg} + \mathrm{O}_{2}\): \[ 2\mathrm{Mg} + \mathrm{O}_2 \rightarrow 2\mathrm{MgO} \]

• n) \(\mathrm{Fe} + \mathrm{Cl}_{2}\): \[ 2\mathrm{Fe} + 3\mathrm{Cl}_2 \rightarrow 2\mathrm{FeCl}_3 \]

Final Answer