Final answer:
The precipitate that forms when aqueous solutions of silver nitrate and potassium chloride react is silver chloride (AgCl).
Step-by-step explanation:
In a double-replacement reaction, the cations and anions from the reactants exchange to form new compounds. To predict the precipitate that forms when aqueous solutions of silver nitrate and potassium chloride react, you need to determine if the product formed is insoluble. One way to do this is by using solubility rules. According to solubility rules, most nitrates are soluble and most chlorides are soluble, except for a few exceptions. In this case, silver chloride is an exception and it is insoluble, so it precipitates out of solution. Therefore, the precipitate that forms is silver chloride (AgCl).