Answer
Physical Properties: soft, silver colored, metal
Chemical Properties: highly reactive with water, oxygen, and chlorine.
Work Step by Step
Physical Properties: can be observed without changing the composition of the matter. They are used to observe and describe the matter in question. The observations of the Potassium being silver, soft, and a metal do not change the composition of the Potassium, and they are descriptive words.
Chemical Properties: A chemical property becomes evident during, or after a chemical change has occurred. As we describe reacting the Potassium with water, oxygen, and chlorine, we are describing a chemical change to the Potassium. Chemical properties cannot be observed while maintaining the original structure of the matter; the matter must undergo a change.
