Question

aluminum replacing a less active metal in a compound is classified as a ____ reaction. decomposition single displacement combination double displacement neutraliztion

Explanation:

• Decomposition reaction: A single compound breaks down into two or more simpler substances. For example, \(2H_2O\xrightarrow{electrolysis}2H_2 + O_2\). This is not the case here as we have a replacement, not a breakdown.
• Single - displacement reaction: A reaction where one element replaces another element in a compound. The general form is \(A+BC

ightarrow AC + B\). Here, aluminum (a more active metal) replaces a less active metal in a compound, which fits the single - displacement pattern.

• Combination reaction: Two or more substances combine to form a single compound. For example, \(2H_2+O_2\xrightarrow{点燃}2H_2O\). This is not a combination reaction.
• Double - displacement reaction: Two compounds exchange ions. The general form is \(AB + CD

ightarrow AD+CB\). For example, \(AgNO_3+NaCl = AgCl\downarrow+NaNO_3\). There is no ion - exchange between two compounds in our problem.

• Neutralization reaction: A reaction between an acid and a base to form a salt and water. For example, \(HCl + NaOH=NaCl + H_2O\). This is not relevant to a metal - replacement scenario.

Answer:

single displacement