Chemical and Physical Properties 2016-2017

Physical Change A change in the physical property of a substance The chemical properties remain the same Ex: ice to water, carving wood…

Any characteristic that can be observed or measured is a physical property.                    Length can be measured.

Physical Physical Properties Physical Changes Def: Properties that can be seen without changing the identity of the substance. Ex: color, shape, hardness, odor, density, dissolvability, mass, weight, volume, texture Def: changes from one phase to another (solid, liquid, gas), without changing the substance Ex: Chopping, slicing, sawing, grinding, dissolving Melting/ Freezing Vaporizing (Boiling) Condensation Sublimation Evaporation

Chemical Change A substance is transformed into a new substance Involves a chemical reaction Ex. Iron rusting (with oxygen) to form iron oxide, chemical explosions, burning of wood

Signs of a Chemical Change Signs of a chemical change include the production of bubbles, heat, light, smoke, sounds or color changes. Chemical changes are not reversible using physical means. http://www.bbc.co.uk/schools/scienceclips/ages/10_11/rev_irrev_changes_fs.shtml

Example Chemical Reaction Before During (fire, smoke) After change

Chemical Chemical Changes Chemical Properties Def: The process by which a substance changes to a new substance Ex: Combustion (burning) Respiration Digestion Leaves changing color Rusting Photosynthesis Baking/cooking Gasoline burning Alka seltzer in water reacting Def: Properties that describe how a substance changes into a new substance Ex: flammability (burning)

Properties Physical Properties Chemical Properties Def: Properties that can be seen without changing the identity of the substance. Ex: color, shape, hardness, odor, density, solubility (how well a solid dissolves), mass, weight, volume, texture Def: Properties that describe how a substance changes into a new substance Ex: flammability (burning)