Question

which is a decomposition reaction?

caco₃ → cao + co₂

mgo + h₂o → mg(oh)₂

2p + 3cl₂ → 2pcl₃

s₈ + 8o₂ → 8so₂

Explanation:

A decomposition reaction is a reaction where a single compound breaks down into two or more simpler substances.

• In the reaction \(CaCO_{3}\to CaO + CO_{2}\), one compound (\(CaCO_{3}\)) is breaking down into two simpler compounds (\(CaO\) and \(CO_{2}\)).
• In the reaction \(MgO + H_{2}O\to Mg(OH)_{2}\), two substances (\(MgO\) and \(H_{2}O\)) are combining to form one compound (\(Mg(OH)_{2}\)), which is a combination reaction.
• In the reaction \(2P+3Cl_{2}\to 2PCl_{3}\), two substances (\(P\) and \(Cl_{2}\)) are combining to form one compound (\(PCl_{3}\)), which is a combination reaction.
• In the reaction \(S_{8}+8O_{2}\to 8SO_{2}\), two substances (\(S_{8}\) and \(O_{2}\)) are combining to form one compound (\(SO_{2}\)), which is a combination reaction.

Answer:

\(CaCO_{3}\to CaO + CO_{2}\)