Question

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: Identify acid - base reactions

Acid - base reactions produce salt and water. In the first reaction $\mathrm{HCl(aq)}+\mathrm{KOH(aq)}
ightarrow\mathrm{KCl(aq)}+\mathrm{H_2O(l)}$, $\mathrm{HCl}$ is an acid and $\mathrm{KOH}$ is a base. In the second reaction $\mathrm{H_2SO_4(aq)}+\mathrm{Zn(OH)_2(s)}
ightarrow\mathrm{ZnSO_4(aq)} + 2\mathrm{H_2O(l)}$, $\mathrm{H_2SO_4}$ is an acid and $\mathrm{Zn(OH)_2}$ is a base.

Step2: Identify precipitation reactions

Precipitation reactions form a solid product. The reaction $\mathrm{NiBr_2(aq)}+\mathrm{K_2S(aq)}
ightarrow2\mathrm{KBr(aq)}+\mathrm{NiS(s)}$ forms $\mathrm{NiS}$ solid.

Step3: Identify synthesis reactions

Synthesis reactions combine two or more reactants to form one product. The reactions $2\mathrm{Zn(s)}+\mathrm{O_2(g)}
ightarrow2\mathrm{ZnO(s)}$ and $\mathrm{H_2(g)}+\mathrm{Cl_2(g)}
ightarrow2\mathrm{HCl(g)}$ are synthesis reactions as they combine elements to form a single compound.

Answer:

• Acid - base reaction examples: $\mathrm{HCl(aq)}+\mathrm{KOH(aq)}

ightarrow\mathrm{KCl(aq)}+\mathrm{H_2O(l)}$, $\mathrm{H_2SO_4(aq)}+\mathrm{Zn(OH)_2(s)}
ightarrow\mathrm{ZnSO_4(aq)} + 2\mathrm{H_2O(l)}$

• Precipitation reaction example: $\mathrm{NiBr_2(aq)}+\mathrm{K_2S(aq)}

ightarrow2\mathrm{KBr(aq)}+\mathrm{NiS(s)}$

• Synthesis reaction examples: $2\mathrm{Zn(s)}+\mathrm{O_2(g)}

ightarrow2\mathrm{ZnO(s)}$, $\mathrm{H_2(g)}+\mathrm{Cl_2(g)}
ightarrow2\mathrm{HCl(g)}$