1. Physical and Chemical Properties and Changes

2. Physical Property
A physical property is any characteristic of a material that can be observed WITHOUT changing the identity of the material itself
Characteristics that can be observed or measured
Color
Length
Shape
Temperature
Density
Melting point
Boiling point
-thermal conductivity
Electrical conductivity

5. Physical change
A physical change is any change in the size, the shape, or the state of the matter in which the identity of the substance is unchanged
Physical changes:
Dissolving
Mixing
Changes in state
Freezing, boiling, condensation, vaporization, sublimation, deposition

7. Chemical properties
A chemical property is the ability or inability of a substance to combine with or change into one or more new substances
Properties like:
Flammability: ability to burn
Paper can burn
Hydrogen burns in air
Rust: reactivity with oxygen/water/others
Iron will rust
Aluminum reacts with acid
Silver tarnishes from sulfur in foods
Inability to react or burn
Helium gas does not burn, carbon dioxide is nonflammable
Gold and platinum will not corrode (rust)
Copper and silver do not react with water

9. Chemical and Physical changes
When a substances changes, its properties change.
Ice melts
Iron rusts
Growing taller
Digested food becomes part of your body
With some substances, chemical properties can also change
Food you eat is changed due to disgestion process
Iron rusting forms a new compound, iron oxide

10. Chemical changes
A chemical change is the change of one or more substances into other substances
In chemical changes, the atoms rearrange and form one or more new substances
Not easily reversed
Paper burns, ashes, can’t go back to paper
Food you eat, digest, poop, can’t go back to food
Physical changes on the other hand can be reversed