Question

which clue can be used to identify a chemical reaction as a replacement reaction?
the reaction has two reactants with ions that seem to switch places.
the reaction has a single reactant that changes into two or more products.
the reaction involves oxygen reacting with a hydrocarbon and giving off heat.
the reaction involves a single product forming from two or more reactants.

Explanation:

• A replacement reaction (also known as a single - displacement or double - displacement reaction) involves ions switching places. For example, in a double - displacement reaction \(AB + CD

ightarrow AD+CB\), the ions \(B\) and \(D\) switch places.

• A reaction with a single reactant changing into two or more products is a decomposition reaction (\(A

ightarrow B + C\)).

• A reaction involving oxygen reacting with a hydrocarbon and giving off heat is a combustion reaction (e.g., \(C_{x}H_{y}+O_{2}

ightarrow CO_{2}+H_{2}O+\text{heat}\)).

• A reaction involving a single product forming from two or more reactants is a combination reaction (\(A + B

ightarrow AB\)).

Answer:

The reaction has two reactants with ions that seem to switch places.