Question

synthesis (s) or decomposition (d)?

1. \\(\ce{p4o10(s) -> p4(s) + 5o2(g)}\\)
2. \\(\ce{n2(g) + 3h2(g) -> 2nh3(g)}\\)
3. \\(\ce{fe(s) + s(s) -> fes(s)}\\)
4. \\(\ce{2al(s) + 3br2(l) -> 2albr3(s)}\\)
5. \\(\ce{2kclo3(s) -> 2kcl(s) + 3o2(g)}\\)

justify your answers:

Explanation:

1)

Step1: Identify reaction type

A decomposition reaction breaks a compound into simpler substances. Here, $\ce{P4O10}$ (a compound) breaks into $\ce{P4}$ and $\ce{O2}$ (simpler substances).

Step2: Confirm type

Since one reactant forms multiple products, it's decomposition (D).

Step1: Identify reaction type

A synthesis reaction combines simpler substances into a compound. Here, $\ce{N2}$ and $\ce{H2}$ (simpler substances) combine to form $\ce{NH3}$ (a compound).

Step2: Confirm type

Since multiple reactants form one product, it's synthesis (S).

Step1: Identify reaction type

Synthesis combines simpler substances. $\ce{Fe}$ and $\ce{S}$ (elements, simpler) combine to form $\ce{FeS}$ (a compound).

Step2: Confirm type

Multiple reactants (2) form one product, so it's synthesis (S).

Answer:

D (Decomposition), as one compound ($\ce{P4O10}$) breaks into simpler substances ($\ce{P4}$ and $\ce{O2}$).

2)