When do I take notes?
 Copy down any bullet points slides that have a hand
and pencil on them.
 Like this one!
Matter Can Change Form
 Energy is ALWAYS involved when matter changes
 Sometimes a completely new substance is formed (the
molecules change in a chemical reaction)
 Sometimes no new substances are formed (the molecules
are the same)
Two examples of changing matter:
1. An iceberg melts. Is a new substance formed? Explain
why or why not.
2. A piece of wood burns. Is a new substance formed?
Explain why or why not.
Physical Properties of Matter
 Physical Properties
describe something
(measurable
characteristics).
 EXAMPLES
 Color
 State
 Density
 Boiling/Melting Point
 Shape
 Solubility
 Appearance
Electrical Conductivity
 Electrical conductivity is
how well a substance
allows electricity to flow
through it.
 Example:
 Copper is a good conductor
of electricity. It is used for
electrical wiring.
Solubility
 Solubility is the ability to
dissolve in another
substance
 Example:
 Sugar will dissolve in water
 What else can we dissolve?
Solubility
 We can use solubility to make many different
compositions of matter.
 Homogeneous mixtures such as salt water, a material
made of two or more substances that is uniform.
 Heterogeneous mixtures such as polyester-cotton blend,
a material made of two or more substances that is easily
separated.
 Colloids such as milk, or heterogeneous mixtures that
never settle.
 And...
Solubility
 SUSPENSIONS!
 Heterogeneous mixtures containing liquid in which
visible particles settle.
 http://www.youtube.com/watch?v=f2XQ97XHjVw
 http://www.youtube.com/watch?v=2CJJ6FrfuGU&featur
e=related
Physical Changes
 Physical changes occur
when all the physical
properties stay the same
and no new things are
created.
 Examples of physical
changes
 Tearing paper into pieces
 Ice cream melting
 Splitting wood into





kindling
Wadding up a blanket into
a ball
Cutting cake into pieces
Stacking pennies into piles
Stretching a rubber band
Dissolving salt into water
4 physical changes lab
Chemical Properties of Matter
 Chemical Properties
describes how things
react when they come in
contact with other
things.
 EXAMPLES
 Ignite
 Decompose
 Oxidize
 Precipitate
 Dehydrate
 Polymerize
 Reduce
Ignite
 To catch on fire! 
Oxidize
 Objects combine with
oxygen and form what is
called “oxides”
 For example, Oxygen,
Iron and water combine
to form rust
Precipitate
 Separating a solid from a
solution.
Polymerize
 To form a polymer (Any
of various chemical
compounds made of
smaller, identical
molecules linked
together)
 Think slime!
Dehydrate
 Removing fluid from an
object
Chemical Changes
 Chemical changes occur
when 2 or more things
react with each other
and form a completely
new thing with new
physical properties.
 Examples of chemical
changes
 A new color is produced
 Heat is released or






absorbed
A gas is released
A new taste is created
pH goes up or down
A new odor is released
Light is produced
A solid is formed
Activity: Physical or Chemical?
Sort each word into the correct column:
Dissolving
Burning
Exploding
Bleaching
Rusting
Breaking
Fizzing
Evaporation
Freezing
Melting
Rotting
Cutting
Corroding
Crushing
Ticket out the door
 Share your response to the following question:
 What is the main difference between physical and
chemical changes and properties?
4 chemical changes lab