1. Pure Substances
Definition: Matter that always has the same
composition. Substances can be classified into two
categories- elements and compounds.
Examples: sugar, salt, etc...
3. Compounds
Definition: A substance that is made from 2 or
more simpler substances and can be broken down
into those simpler substances.
Examples: H2o (water), NaCl (salt)
7. Colloids
Definition: Contain some particles that are
intermediate in size between the small particles in a
solution and larger particles in a suspension.
Examples: fog, milk
8. Evaporation
Definition: The process that changes a substance from a
liquid to a gas or the opposite by reaching boiling point or
melting point.
Examples: Water, Ice,
9. Distillation
Definition: A process that separates substances in a
solution based on their boiling points.
Examples: Fresh water for submarines
10. Filtration
Definition: A process that separates materials
based on their particle size.
Examples: Tea bag, Spaghetti strainer.
11. Physical Properties
Odor- What something smells like
Melting/Freezing Point- The temperature at which a solid changes to a liquid or the opposite.
Boiling Point- The temperature at which a liquid turns into a gas.
Solubility-The ability of a substance to dissolve another.
Density- D= M/V
Viscosity-Resistance to flow.
12. Physical Change
Definition: Occurs when some of the properties of a
material change, but the substances in the material
stay the same.
Examples: haircut, melting butter,
14. Reactivity
Definition:The property that describes the how readily a
substance combines chemically with other substances.
Examples: Pure Potassium and water, oxygen and iron.
15. Chemical Change
Definition: Occurs when a substance reacts and forms
one or more new substances.
Example: Bleach and jeans, rotting fruit(color), bubbles,
production of gas, change in color, formation of
precipitate.
16. What kind of change is
happening when paper
burns?
