1. Chemistry Vocabulary: Part 2

2. Physical Properties
Can be observed or measured without changing the matter’s identity
Adjective – descriptive word
Examples
Color
Smell
Size/Shape
Texture/Taste
Temperature
Density
State (Solid, Liquid, Gas)

3. Chemical Properties
Substance ability to participate in chemical reactions
Hard to observe
In order to see these you must change the substance into a new substance
Examples
Flammability
Reactivity

4. Characteristic Properties
Chemical or physical property that is always the same no matter what size the sample is
Can be physical or chemical
Most useful type of property
Examples
Density
Flammability
Reactivity
Boiling Point, Melting Point, Freezing Point
Color
Smell

5. Physical Changes
A change of matter from one form to another without a change in chemical properties
Usually reversible, no change to matter composition
End with the same thing you started with
Examples:
Ripping
Crushing
Cutting
Heating
Cooling
Coloring
All changes of state

6. Chemical Changes
A change that occurs when one or more substances change into entirely new substances with different properties
Never reversible
End with something different than you started with
Examples:
Soured Milk
Burning
Digesting
Cooking/Baking
Rotting/Spoiling
Tarnishing

7. Signs of a Chemical Change
Change in color
Change in temperature
Fizzing/Foaming
Sound or light being given off
New smell
New taste
Precipitate – when two liquids are mixed together and form a solid

8. Endothermic
Energy is absorbed by a substance or substances

9. Exothermic
Energy is released from a substance or substances