which of the following images represents a single - replacement reaction? two reactants two products

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# Brief Explanations:
A single - replacement reaction has the general form $A + BC
ightarrow AC + B$ (or $Y+XZ
ightarrow YZ + X$). Let's analyze each reaction:

1. For the left - side reaction (with reactant $AB$): The reactants would be $AB$ and another substance. But from the diagram, if we consider the reaction, it doesn't follow the single - replacement pattern. The products here are $A$ and $B$, which looks more like a decomposition reaction (if we assume $AB
ightarrow A + B$), not single - replacement.

2. For the right - side reaction (with reactants $A$ and $BC$): The reactants are an element $A$ (the blue atoms) and a compound $BC$ (the red - green molecules). The products are a compound $AC$ (the red - blue molecules) and an element $B$ (the green atoms). This follows the general form of a single - replacement reaction ($A+BC
ightarrow AC + B$).

# Answer:
The reaction with reactants $A$ and $BC$ (the right - hand side reaction in the diagram) represents a single - replacement reaction.

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