Physical and Chemical Changes Properties of Matter Physical and Chemical Changes

A distinctive attribute or quality of something An observation What is a property? A distinctive attribute or quality of something An observation

Two Types of Properties There are two types of properties: Physical Properties Chemical Properties

Physical Properties Physical properties are properties that you can observe without changing the identity of the material. For example: A rubber band is stretchy. If you stretch a rubber band, it is still a rubber band.

Physical Properties Physical properties are descriptive. They include the appearance and behavior. The appearance of the item is how it looks, feels, tastes, as well as any measurable characteristics like mass, volume, etc. The behavior of an item is going to be how it reacts with certain other things. For instance, metals are usually attracted by magnets.

Common Physical Properties Magnetic Dense Color Size Shape

Physical Change A change in the size, shape, or phase of matter is known as a physical change. A physical change is one in which the basic identity of the object does not change! Another way to look at it is that a physical change is one which you can change back.

Common Physical Changes Physical changes change the appearance of a substance, but the chemical makeup does not change. Examples of Physical Changes include: Size Shape Phase (solid, liquid, gas) Dissolving

Chemical Properties A characteristic that indicates it can undergo an chemical change.

Common Chemical Properties Flammability Reactivity Rust (Oxidation)

Chemical Change The changing of one substance into another. New substances are produced because of the breaking of chemical bonds. ONE WHICH YOU CAN’T CHANGE BACK

Detecting Chemical Change A new substance is ALWAYS produced in a chemical change.

Chemical Changes New substances are produced by the making and/or breaking of bonds.

Indicators There are five indicators that help us to know that a chemical change is taking place: Unexpected Color Change Energy Transfer Precipitate Produced Odor Produced Gas Produced