Final answer:
The type of chemical reaction that occurs when lead nitrate reacts with potassium iodide is a precipitation reaction, resulting in the formation of lead iodide and potassium nitrate.
Step-by-step explanation:
The type of chemical reaction that occurs when lead nitrate reacts with potassium iodide is a precipitation reaction. In a precipitation reaction, a solid substance called a precipitate is formed when two soluble compounds react with each other.
In this case, the lead ions from lead nitrate combine with the iodide ions from potassium iodide to form a yellow solid called lead iodide, while the potassium ions from potassium iodide combine with the nitrate ions from lead nitrate to form potassium nitrate.