Question

question 8 1 pts which of the following is an oxidation - reduction reaction? h₂co₃(aq) + ca(no₃)₂(aq) → 2hno₃(aq) + caco₃(s) ba(c₂h₃o₂)₂(aq) + na₂so₄(aq) → baso₄(s) + 2nac₂h₃o₂(aq) agno₃(aq) + hcl(aq) → agcl(s) + hno₃(aq) hcl(aq) + naoh(aq) → h₂o(l) + nacl(aq) cu(s) + 2agno₃(aq) → 2ag(s) + cu(no₃)₂(aq) question 9 1 pts all of the reactions shown are oxidation - reduction reactions except 2fe₂o₃(s) → 4fe(s) + 3o₂(g) n₂(g) + o₂(g) → 2no(g) k₂so₄(aq) + bacl₂(aq) → baso₄(s) + 2kcl(aq) zn(s) + 2hcl(aq) → zncl₂(aq) + h₂(g)

Explanation:

Question 8

• Oxidation - reduction reactions involve a transfer of electrons, which is indicated by a change in oxidation states of elements.
• In \(Cu(s)+2AgNO_3(aq)\to2Ag(s)+Cu(NO_3)_2(aq)\), \(Cu\) (oxidation state \(0\)) is oxidized to \(Cu^{2 +}\) (oxidation state \(+ 2\)) and \(Ag^{+}\) (oxidation state \(+1\)) is reduced to \(Ag\) (oxidation state \(0\)).
• For \(H_2CO_3(aq)+Ca(NO_3)_2(aq)\to2HNO_3(aq)+CaCO_3(s)\), it is a double - displacement reaction (no change in oxidation states).
• For \(Ba(C_2H_3O_2)_2(aq)+Na_2SO_4(aq)\to BaSO_4(s)+2NaC_2H_3O_2(aq)\), it is a double - displacement reaction (no change in oxidation states).
• For \(AgNO_3(aq)+HCl(aq)\to AgCl(s)+HNO_3(aq)\), it is a double - displacement reaction (no change in oxidation states).
• For \(HCl(aq)+NaOH(aq)\to H_2O(l)+NaCl(aq)\), it is an acid - base neutralization (double - displacement, no change in oxidation states).

• In \(2Fe_2O_3(s)\to4Fe(s)+3O_2(g)\), \(Fe\) is reduced (\(+3\) to \(0\)) and \(O\) is oxidized (\(- 2\) to \(0\)).
• In \(N_2(g)+O_2(g)\to2NO(g)\), \(N\) is oxidized (\(0\) to \(+2\)) and \(O\) is reduced (\(0\) to \(-2\)).
• In \(K_2SO_4(aq)+BaCl_2(aq)\to BaSO_4(s)+2KCl(aq)\), it is a double - displacement reaction (no change in oxidation states).
• In \(Zn(s)+2HCl(aq)\to ZnCl_2(aq)+H_2(g)\), \(Zn\) is oxidized (\(0\) to \(+2\)) and \(H\) is reduced (\(+1\) to \(0\)).

Answer:

\(Cu(s)+2AgNO_3(aq)\to2Ag(s)+Cu(NO_3)_2(aq)\)

Question 9