CPs & NCPs: Changes to Matter

Review: Characteristic Properties A characteristic property is a physical or chemical property that is unique to a particular substance. It can be used to identify a substance.

Review: Non-Characteristic Properties A non-characteristic property is a physical or chemical property that is not unique to one particular substance. It could be used to describe many substances

Review: Temperatures Freezing Point of Water: 0°C Melting Point of Ice: 0°C Boiling Point of Water: 100°C These are all examples of Physical Changes

Physical vs. Chemical Properties and Changes Physical Properties: These can be observed or measured without changing the make-up of the matter of the object. These properties can be used to describe the object.

Physical Properties Include: Appearance Texture Color Odor Melting point Boiling point Density Solubility

Physical Changes Physical Changes: These are changes that relate to the physical properties. There is no change to the chemical make-up during a physical change.

Examples of Physical Changes Ice melting Clay being modeled into a new shape Butter melting on toast Paper is cut in half Water evaporates from the surface of the ocean A beach ball deflates

Chemical Properties Chemical Property: A chemical property becomes evident during a chemical reaction. This is because it only becomes apparent when the object is chemically changed. A chemical property cannot be determined by simply viewing or touching the object

Chemical Changes Chemical changes: These are changes that change the substance or object into something different or new. These changes are also irreversible.

Examples of Chemical Changes Explosion of fireworks Nail rusts Bread becomes toast Milk goes sour You digest food Paper on fire

The 5 Signs of a Chemical Change A chemical change has happened if 1) A gas or solid (precipitate) is produced 2) There is a colour change 3) Heat is created or absorbed 4) A light is given off 5) An odour is produced