Do Now: Write down three examples of physical changes.
Music: Rush – Tom Sawyer
Book Section: 2.2
Classifying Matter
 A pure substance is a
single component with
unique chemical
properties.
 Ex: ethanol, water, any
element or compound
 A mixture is a blend of
two or more components.
 A mixture can either be
classified as
homogeneous or
heterogenous.
Classifying Matter
 Homogeneous mixtures
– can not tell components
from each other.
 Also called solutions
 Examples: broth, plain
yogurt, salt water
 Heterogenous mixtures
– can tell the components
apart
 Exampes: salad, Italian
salad dressing, oil &
vinegar
 Demo: Oil/Vinegar,
sugar water
Classification of Matter
Classification of Matter
Classification of Matter
Classification of Matter
Classification of Matter
Separation of Mixtures
 Distillation uses
differences in boiling
points to boil and recondense liquids from
each other.
 Equipment Show &
Tell: Condenser,
Distiller.
Separation of Mixtures
 In filtration, solid
substances are separated
from liquids and
solutions.
 Show & Tell: Filtration
Setup
Separation of Mixtures
 Chromatography separates substances on the basis
of differences in solubility in a solvent.
Heterogenous or Homogenous?
 Food coloring
 Ice cubes in liquid water
 Mouthwash
 Mashed, unpeeled potatoes
Heterogenous or Homogenous?
 Food coloring - homogenous
 Ice cubes in liquid water - heterogenous
 Mouthwash - homogenous
 Mashed, unpeeled potatoes - heterogenous
Homework 1-6 Due Tomorrow!
 This week:
 Thursday – Elements and Compounds (2.3) – HW 1-6
Due
 Friday – Chemical Reactions & Conservation of Mass
(2.4) – HW 1-7 Due
 Unit 1 Test – Thursday, September 16