Question

part b give examples. check all that apply. hcl(aq) + koh(aq) → kcl(aq) + h₂o(l) h₂so₄(aq) + zn(oh)₂(s) → znso₄(aq) + 2h₂o(l) nibr₂(aq) + k₂s(aq) → 2kbr(aq) + nis(s) 2zn(s) + o₂(g) → 2zno(s) h₂(g) + cl₂(g) → 2hcl(g)

Explanation:

Step1: Recall acid - base reaction

An acid - base reaction produces a salt and water.

Step2: Analyze each equation

• For $\mathrm{HCl}(aq)+\mathrm{KOH}(aq)

ightarrow\mathrm{KCl}(aq)+\mathrm{H}_{2}\mathrm{O}(l)$, $\mathrm{HCl}$ is an acid, $\mathrm{KOH}$ is a base, and they react to form the salt $\mathrm{KCl}$ and water.

• For $\mathrm{H}_{2}\mathrm{SO}_{4}(aq)+\mathrm{Zn}(\mathrm{OH})_{2}(s)

ightarrow\mathrm{ZnSO}_{4}(aq)+2\mathrm{H}_{2}\mathrm{O}(l)$, $\mathrm{H}_{2}\mathrm{SO}_{4}$ is an acid, $\mathrm{Zn}(\mathrm{OH})_{2}$ is a base, and they form the salt $\mathrm{ZnSO}_{4}$ and water.

• For $\mathrm{NiBr}_{2}(aq)+\mathrm{K}_{2}\mathrm{S}(aq)

ightarrow2\mathrm{KBr}(aq)+\mathrm{NiS}(s)$, this is a double - displacement reaction that forms a precipitate ($\mathrm{NiS}$), not an acid - base reaction.

• For $2\mathrm{Zn}(s)+\mathrm{O}_{2}(g)

ightarrow2\mathrm{ZnO}(s)$, this is a combination reaction (oxidation of zinc).

• For $\mathrm{H}_{2}(g)+\mathrm{Cl}_{2}(g)

ightarrow2\mathrm{HCl}(g)$, this is a combination reaction to form a compound.

Answer:

$\mathrm{HCl}(aq)+\mathrm{KOH}(aq)
ightarrow\mathrm{KCl}(aq)+\mathrm{H}_{2}\mathrm{O}(l)$
$\mathrm{H}_{2}\mathrm{SO}_{4}(aq)+\mathrm{Zn}(\mathrm{OH})_{2}(s)
ightarrow\mathrm{ZnSO}_{4}(aq)+2\mathrm{H}_{2}\mathrm{O}(l)$