This occurs in nuclear reactions . Chemical and Physical Properties Physical Properties are those that can be observed without the substance changing into another substance. Hardness Density Color Electrical and thermal conductivity Refractive index Chemical properties are those which depend on the substance changing from one chemical substance to another. Extensive vs. Intensive Properties Properties which depend on the amount of material are called extensive properties. Those that don't depend on the amount of material are intensive properties.
Examples are mass, volume, and heat needed to cause a one degree change in temperature.
All of these are proportional to the amount of material present. Intensive properties are fundamental properties of the material. These include density, transition temperatures, color, and all chemical properties. Intensive properties are the same for all samples of the material. Physical changes are changes which do not involve a change in the composition of the material.