Question

caco₃ → cao + co₂ the reaction above is classified as a synthesis b double displacement c decomposition d single displacement e combustion reaction

Explanation:

• Synthesis reaction: A synthesis reaction is when two or more reactants combine to form a single product. For example, \(A + B

ightarrow AB\). In the given reaction \(CaCO_{3}
ightarrow CaO + CO_{2}\), there is one reactant and two products, so it is not a synthesis reaction.

• Double - displacement reaction: In a double - displacement reaction, the general form is \(AB+CD

ightarrow AD + CB\) (where ions are exchanged between two compounds). The given reaction \(CaCO_{3}
ightarrow CaO + CO_{2}\) does not involve ion exchange between two compounds, so it is not a double - displacement reaction.

• Decomposition reaction: A decomposition reaction has the general form \(AB

ightarrow A + B\) (one reactant breaks down into two or more products). The reaction \(CaCO_{3}
ightarrow CaO + CO_{2}\) follows the form of a decomposition reaction (\(CaCO_{3}\) is the single reactant that breaks down into \(CaO\) and \(CO_{2}\)).

• Single - displacement reaction: A single - displacement reaction has the form \(A+BC

ightarrow AC + B\) (an element displaces another element in a compound). The given reaction \(CaCO_{3}
ightarrow CaO + CO_{2}\) does not involve an element displacing another element in a compound, so it is not a single - displacement reaction.

• Combustion reaction: A combustion reaction is a reaction of a substance with oxygen (usually producing heat and light). The general form for the combustion of a hydrocarbon is \(C_{x}H_{y}+O_{2}

ightarrow CO_{2}+H_{2}O\). The given reaction \(CaCO_{3}
ightarrow CaO + CO_{2}\) does not involve a reaction with oxygen (in the sense of a combustion process), so it is not a combustion reaction.

Answer:

C. decomposition