Question

Classify each of these reactions.

Answer 1

Answer;

1)Ba(ClO3)2(s)--->BaCl2(s)+3O2(g) - Redox reaction

2)2NaCl(aq)+K2S(aq)--->Na2S(aq)+2KCl(aq)  - None of the above

3)CaO(s)+CO2(g)--->CaCO3(s)  - None of the above

4)KOH(aq)+AgCl(aq)---->KCl(aq)+AgOH(s) -precipitation reaction

5)Ba(OH)2(aq)+2HNO2(aq)--->Ba(NO2)2(aq)+2H2O(l)  - Acid-base neutralization reaction

Explanation;

• Ba(ClO3)2(s)--->BaCl2(s)+3O2(g)

In this reaction, chlorine is reduced and oxygen is oxidized. Both reduction and oxidation occur in this reaction. Therefore, this is a redox reaction.

• 2NaCl(aq)+K2S(aq)--->Na2S(aq)+2KCl(aq)

In this reaction, both Na2S and KCl are soluble in water. Therefore the reaction is non of the above. Since it can not be a double displacement reaction in which two compounds react and cations and anions exchange their places to form new compounds.

• CaO(s)+CO2(g)--->CaCO3(s)

In this reaction CaO and CO2 combine to form calcium carbonate. This is a synthesis reaction, and thus its none of the above choices

• KOH(aq)+AgCl(aq)---->KCl(aq)+AgOH(s)

In this reaction, the salt KCl is soluble in water and AgOH is insolubel in water. Therefore, this is a precipitation reaction.

• Ba(OH)2(aq)+2HNO2(aq)--->Ba(NO2)2(aq)+2H2O(l)

In this reaction, nitrous acid acts as an acid and barium hydroxide acts as a base. Therefore, barium hydroxide and nitrous acid react to form salt and water. Therefore, this reaction is acid-base neutralization reaction.