1. Chemical Changes

2. 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

3. 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

4. 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

5. 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