Question

classify each chemical reaction:

2al(s) + 3znbr₂(aq) → 2albr₃(aq) + 3zn(s)

2cri₃(aq) + 3pb(no₃)₂(aq) → 2cr(no₃)₃(aq) + 3pbi₂(s)

2ca(s) + o₂(g) → 2cao(s)

ba(clo₃)₂(s) → bacl₂(s) + 3o₂(g)

select

combination
decomposition
single displacement
double substitution
none of the above

Explanation:

• For the reaction \(2Al(s)+3ZnBr_{2}(aq)\to2AlBr_{3}(aq)+3Zn(s)\), one element (\(Al\)) replaces another element (\(Zn\)) in a compound. This is characteristic of a single - displacement reaction.
• For the reaction \(2CrI_{3}(aq)+3Pb(NO_{3})_{2}(aq)\to2Cr(NO_{3})_{3}(aq)+3PbI_{2}(s)\), the ions of two compounds exchange partners. This is a double - substitution (double - displacement) reaction.
• For the reaction \(2Ca(s)+O_{2}(g)\to2CaO(s)\), two substances (\(Ca\) and \(O_{2}\)) combine to form a single product (\(CaO\)). This is a combination reaction.
• For the reaction \(Ba(ClO_{3})_{2}(s)\to BaCl_{2}(s)+3O_{2}(g)\), a single compound (\(Ba(ClO_{3})_{2}\)) breaks down into two simpler substances (\(BaCl_{2}\) and \(O_{2}\)). This is a decomposition reaction.

Answer:

1. single displacement
2. double substitution
3. combination
4. decomposition