matter

pure substances are…

uniform throughout

two types of pure substances:

• elements

• compounds

element:

• only one type of atom

• CANNOT be broken down at all

monatomic;

• exist as single atoms

diatomic:

• exists as molecule

• 2 of same atom

diatomic elements:

Br

I

N

Cl

H

O

F

molecule:

more than one atom

compounds:

• 2 or more different atoms

• can be CHEMICALLY broken/seperated

• WHOLE NUMBER RATIOS

examples of compounds:

H2o

NaCl

the two types of mixtures…

homogeneous and heterogeneous

homogeneous

• EVENLY/UNIFORMLY mixed

• solutions (aq)

• CAN BE seperated by EVAPORATION, DISTILLATION

• CANNOT be seperated by FILTRATION

heterogeneous

• UNEVENLY mixed

• you can see diff parts

• ex. SAND + WATER

• CAN BE seperated by DISTILLATION, EVAPORATION + FILTRATION

(aq) = ?

dissolved

filtration

• seperated solid from liquid

• separation of heterogenous mixtures

• CANNOT BE USED to separate homogeneous