Changing Matter

Matter can be described in terms of two kinds of properties: Physical properties Chemical properties

Physical Properties Anything that can be observed without changing the identity of the substance. (Tends to be measurable.) Examples: Color, hardness, texture, shine and flexibility, melting point, boiling point, electrical conductivity, density, thermal conductivity, ductility, malleability, solubility

Chemical Properties Are characteristics of a substance that describes its ability to change into other substances. To observe the chemical properties of a substance, you must change it to another substance. Ex. Burning, tarnishing, and rusting

Matter changes in two ways 1.Physical Change 2. Chemical Change

Physical Change Physical change is any change that alters the form or appearance of a substance but DOES NOT make the substance into another substance. Examples: Bending, crushing, breaking, cutting, and anything else that changes only the shape or form of matter.

Chemical Change Chemical change occurs when a change in matter produces one or more new substances. This is also called a CHEMICAL REACTION. Examples Precipitate is formed, color change, production of gas and changes in energy

Evidence of a Chemical Reaction

Changes in Energy Endothermic reaction – a reaction in which energy is absorbed. (Gets cold) Ex. Frying an egg Exothermic reaction – a reaction that releases energy in the form of heat. Ex. Sugar and sulfuric acid (gets hot)

Matter Physical Properties Chemical Properties Physical Change Chemical Change