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This is a chemical change because a new compound, potassium nitrate, is formed through a chemical reaction between the potassium iodide and lead nitrate. Physical changes do not involve the formation of new substances.
Adding water to potassium nitrate will create a solution of potassium nitrate.
No, adding lead nitrate to sodium chromate results in a chemical reaction that forms lead chromate and sodium nitrate. This is a chemical change because new substances are formed with different properties than the original reactants.
The formula when adding potassium (K) and chlorine (Cl) is KCl, which forms potassium chloride. This compound is a salt that is commonly used as a salt substitute and in fertilizer.
Adding antifreeze to your radiator is a physical change because the antifreeze retains its chemical composition and properties when mixed with the water in the radiator. It does not undergo a chemical reaction to form a new substance.
Adding sugar to cereal is a physical change because the sugar does not undergo a chemical reaction when mixed with the cereal. The sugar retains its chemical structure and properties, only altering the taste of the cereal.