Final answer:
To identify a single-replacement reaction, check if one element replaces another in a compound, as indicated by option c. This reaction follows the general formula A + BC → AC + B.
Step-by-step explanation:
To identify a single-replacement reaction, you should look for a reaction where one element takes the place of another element in a compound. This can often be spotted when you have a solitary element and a compound as reactants, leading to a different element being released and a new compound forming.
This is represented by the general formula: A + BC → AC + B. The correct answer to the question presented would, therefore, be option c: Check if one element replaces another element in a compound.
In contrast, a double-replacement reaction involves two ionic compounds in solution that exchange their cations or anions, potentially resulting in a solid precipitate if one of the products is insoluble in water. This has its own indicative pattern, often seen through two compounds reacting to form two different compounds.
Option a, which discusses the formation of salt and water, is more indicative of a neutralization reaction. Option b refers to a double-replacement reaction, and option d suggests an acid-base reaction, specifically a neutralization reaction if salt and water are produced.