Physical Properties vs. Chemical Properties
Physical Properties
-->Can be observed or measured without altering the identity of a material
-->Such as:
- Color
- Natural Odor
- Density
- Melting Point
- Boiling Point
-->Physical properties may be extensive or intensive
Extensive: dependent on amount of matter present (typically measurements)
Intensive: independent on amount of matter present (DENSITY IS INTENSIVE)
Chemical Properties
- -->Describe the ability to undergo change that transforms it into new and different substances
- -->Such as:
- - Decomposes when exposed to light
- - Oxidizes upon heating
- - Supports Combustion
- - Ability to Rust
Physical Change
- -->Any change in matter that does not result in a change in identity
- - Boil
- - Boil
- - Freeze
- - Dissolve
- - Condense
- - Break
- - Split
- - Crack
- - Grind
- - Cut
- - Crush
- - Bend
- - Can include a temperature change ( PHASE CHANGES are always physical)
Chemical Change
- -->The ability of a substance to undergo a change that alters its identity
- - Burn
- - Ferment
- - Rot
- - Rust
- - Explode
- - Corode
- -->any change in which one or more substances are converted into different substances with different characteristic properties
Reactant+Reactant = Product
- - Reactants: Substance(s) that undergo a chemical reaction (The starting substances in a chemical reaction
- - Iron + Oxygen (Reactants) → Iron Oxide (Rust)
- - Products: Substance(s) that are created during a chemical reaction
- - Iron + Oxygen → Iron Oxide (Product)
-->Indicators of a chemical reaction
- Release or absorb light or heat energy
- Ferment
- Production of a gas
- Formation of a precipitate
- Unexpected color changes
- Production of an odor
- pH change
