Question

b. identify the type of reaction as synthesis, decomposition, single - replacement, double - replacement, and combustion:

1. na₃po₄ + 3 koh → 3 naoh + k₃po₄
2. pb + feso₄ → pbso₄ + fe
3. 2 bf₃ + 3 h₂o → b₂o₃ + 6 hf
4. 2 al + 6 hcl → 2 alcl₃ + 3 h₂
5. 2 fe + o₂ + 2 h₂o → 2 fe(oh)₂

Explanation:

Step1: Analyze reaction 1

Two compounds exchange ions. $Na_3PO_4 + 3KOH\to3NaOH + K_3PO_4$ is a double - replacement reaction as the cations ($Na^+$ and $K^+$) exchange anions ($PO_4^{3 -}$ and $OH^-$).

Step2: Analyze reaction 2

A single element ($Pb$) replaces another element ($Fe$) in a compound. $Pb + FeSO_4\to PbSO_4+Fe$ is a single - replacement reaction.

Step3: Analyze reaction 3

Two compounds exchange ions. $2BF_3 + 3H_2O\to B_2O_3 + 6HF$ is a double - replacement reaction as the $B$ and $H$ ions exchange anions ($F^-$ and $O^{2 -}$).

Step4: Analyze reaction 4

A single element ($Al$) replaces another element ($H$) in a compound. $2Al + 6HCl\to2AlCl_3 + 3H_2$ is a single - replacement reaction.

Step5: Analyze reaction 5

Multiple substances ($2Fe$, $O_2$, $2H_2O$) combine to form one compound ($2Fe(OH)_3$). $2Fe + O_2+2H_2O\to2Fe(OH)_3$ is a synthesis reaction.

Answer:

1. Double - replacement
2. Single - replacement
3. Double - replacement
4. Single - replacement
5. Synthesis