A reaction where one element replaces another in a compound

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BlackTom AI · Accepted Answer

Consider the nature of the chemical reaction described: a reaction where one element replaces another in a compound. 
Option: combination. This is when two or more substances combine to form a single product, not involving a replacement of an element within an existing compound, so this does not match the described scenario. 
Option: combustion. Combustion is a rapid reaction with oxygen that typically produces heat and light, often forming oxides; it does not focus on one element swapping places inside a compound, so this is not correct for the given definition. 
Option: decomposition. Decomposition involves a single compound breaking down into two or more simpler substances, which is the opposite of replacement within a compound, so this option misfits the concept. 
Option: double displacement. In a double displacement reaction, the cations and anions of two different compounds exchange partners, which involves two elements rearranging, not one element replacing another in a single compound, so this is not the best match for the description. 
Option: single displacement. This is precisely the scenario where one element replaces another element in a compound, leading to a new element taking the place of another within the compound’s structure, which aligns with the prompt. 
Thus, the choice that fits the description is single displacement because it centers on substitution of one element for another within a compound, while the other listed reaction types involve combination, combustion, breakdown, or a two-subcompound exchange that does not reflect single-element replacement.

CHEM 110 Section 3 (PM) SP25 Pre-Lecture Quiz 37 C15-1-2

A reaction where one element replaces another in a compound

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