Which reaction involves a single substance breaking down into two or more substances?

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Multiple Choice

Which reaction involves a single substance breaking down into two or more substances?

Explanation:
Decomposition reactions involve a single compound breaking down into two or more substances. This happens when a compound is energized—by heat, electricity, or another trigger—causing its bonds to split and form simpler products. A classic example is calcium carbonate decomposing into calcium oxide and carbon dioxide: CaCO3 -> CaO + CO2. The other types don’t fit this pattern: synthesis is when two or more substances combine to form one product; combustion is burning with oxygen to produce heat and new substances like carbon dioxide and water; neutralization is an acid–base reaction forming a salt and water.

Decomposition reactions involve a single compound breaking down into two or more substances. This happens when a compound is energized—by heat, electricity, or another trigger—causing its bonds to split and form simpler products. A classic example is calcium carbonate decomposing into calcium oxide and carbon dioxide: CaCO3 -> CaO + CO2. The other types don’t fit this pattern: synthesis is when two or more substances combine to form one product; combustion is burning with oxygen to produce heat and new substances like carbon dioxide and water; neutralization is an acid–base reaction forming a salt and water.

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