Changes in Matter Physical Change is any change
- Slides: 8
Changes in Matter § Physical Change is any change that alters the form or appearance of matter but does NOT make any substance in the matter into a different substance.
Physical Changes § Changes in State § Solid, liquid, gas § Changes in form: § Dissolving § Bending § Crushing § Breaking § Chopping § Filtration § Distillation
Chemical Changes § Chemical change- produces one or more new substances with different properties. § Evidence of chemical changes § New substance with different properties § Burning/cooking § Gas is produced (odor) § Precipitate § Endo/Exothermic reaction § Light is produced
Chemical Changes § Examples § Combustion (burning) § Electrolysis (electricity breaks a compound into its elements) § Oxidation (slow combination of a substance with oxygen) Fe. O 2 § Tarnishing (combination of sulfur with a metal)
The Law of Conservation of Mass § No matter is created or destroyed during a chemical or physical change. § No mass is lost, because during a chemical change, atoms are not lost or gained, only rearranged.
Matter and Thermal Energy § Every chemical or physical change in matter includes a change in energy. § Temperature- measures the average random motion of the particles in a substance.
Matter and Thermal Energy § Thermal energy is the total energy of the particles in an object.
Thermal Energy and Changes in Matter § Endothermic change- a change in which energy is taken in. § Exothermic change- a change in which energy is given off.
