Question

12 five chemical reactions are listed in the table below. reaction 1 caco3→cao+co2 reaction 2 ca(oh)2+2hcl→cacl2+2h2o reaction 3 nh3+hcl→nh4cl reaction 4 pbo2→pb+o2 reaction 5 2mg+o2→2mgo identify any decomposition reaction(s) shown in the table. a reaction 1 b reaction 5 c reaction 4 d reaction 2 e reaction 3

Explanation:

A decomposition reaction is a reaction where a single compound breaks down into two or more simpler substances. In Reaction 1: \(CaCO_3
ightarrow CaO + CO_2\), one compound (\(CaCO_3\)) is decomposing into two simpler compounds (\(CaO\) and \(CO_2\)).
Reaction 2: \(Ca(OH)_2+2HCl
ightarrow CaCl_2 + 2H_2O\) is a double - displacement reaction (acid - base reaction).
Reaction 3: \(NH_3+HCl
ightarrow NH_4Cl\) is a combination reaction (synthesis reaction).
Reaction 4: \(PbO_2
ightarrow Pb+O_2\) is a decomposition reaction.
Reaction 5: \(2Mg + O_2
ightarrow 2MgO\) is a combination reaction (synthesis reaction).

Answer:

A. Reaction 1, C. Reaction 4