Chemical Changes

This usually requires a NEW substance to be formed Chemical Properties A chemical property is the ability of a substance to change in composition This usually requires a NEW substance to be formed Examples of chemical properties Flammability Reactivity

Flammability Flammability is the ability of a material to burn in the presence of oxygen Flammability may be a property in some cases, like gasoline so your engine runs or newspaper to start a fire Laws regulate how flammable sleepwear can be, the less flammable in this case the better

Reactivity Reactivity is how easily a substance chemically combines with other substances Examples of reactive elements include oxygen and iron (think about something rusting) Examples of less reactive elements include the Noble gases and nitrogen

Signs of Chemical Change A chemical change occurs when a substance reacts and forms one or more NEW substances Clues for a chemical change include a change in color, the production of a gas, and the formation of a precipitate (a solid that forms in a liquid solution) When a chemical change occurs the composition of the matter changes When a physical change occurs the composition of the matter remains the same