Focus Activity: Look at the picture
below. List 4 observations and make
2 inferences.
Homework: Read section
2.3 and answer questions
on page 55- left side of
your notebook!!!
Dress Appropriately for
the Lab on Wednesday!
Physical Properties of Matter:
a characteristic of a substance that
can be observed without changing it
into another substance
Examples:
 Physical State
 Color
 Texture
 Hardness
 Freezing Point
 Boiling Point
 Malleability (Flexibility)
Chemical Properties of Matter:
a substance’s ability to change into
a different substance
Examples:
 Flammability
 Ability to react with
other substances
 Oxidation (e.g. rust)
 pH Level
Physical Changes
A physical change is any change that alters the
form or appearance of matter but does not
change the substance.
The substance is the same before AND after the
physical change.
Physical Change
Examples:
 Changes of state (melting,
evaporating, etc.)
 Changes in shape or form
(dissolving, bending,
crushing, breaking,
chopping)
 Forming a mixture
 http://www.youtube.com/watch?v=Bfmxn
V32v6I
Is this matter changing into
something new?
How is it changing?
•
chemical
Change
Produces one or more new substances
through a chemical reaction.
Creates a new substance with
properties that are different from the
original substance properties.
chemical Change
Examples:
 Combustion (burning)
 Oxidation (rusting)
 Any chemical reaction
 Cooking food
 http://www.youtube.com/w
atch?v=FZq91OnJJW8&fe
ature=related
CHEMICAL CHANGE
Evidence of Chemical Changes
If there is a chemical
change you might see….
Bubbles
Substance may turn
cloudy
Temperature changes
Color changes
Change in smell or taste
Law of Conservation of Mass
(Matter)
Matter is neither created nor destroyed
during any physical or chemical change.
• The total amount of matter in a chemical
reaction always remains the same.
Molecules can help explain the law of
conservation of matter. For every molecule of
methane that burns, two molecules of oxygen
are used. The atoms are rearranged in the
reaction, but they do not disappear.
Thermal Energy
Energy – the ability to do work or cause
change.
Every physical and chemical change
includes a change in energy.
Slicing bread, folding paper, cutting
toenails, boiling water, all requires energy!
Thermal Energy
Temperature is a measure of the average
energy of the particles matter.
Thermal energy or heat is the total energy
of all the particles in an object.
Thermal Energy
and Changes in Matter
Endothermic Change –
A change in which energy is absorbed
(taken in).
Heat is absorbed by a substance.
Examples:
 snowman melting
 water evaporating
Thermal Energy
and Changes in Matter
Exothermic Change –
A change in which energy is released
Heat is released by a substance.
Examples:
 water freezing or condensing
 burning paper or wood
 hand warmers (for winter)
For your musical enjoyment…
http://www.youtube.com/watch?v=5yjEDih
EuZI&feature=related
Gummy Bears….
With your partner get a cup and 1 gummy
bear.
Write your names on the cup.
Fill the cup about half way with water.
Put the gummy bear in.
We will check it tomorrow.
On the LEFT side, make a prediction
about what you think will happen to your
gummy bear.
http://www.youtube.com/watch?v=5yjEDihEuZI&feature=related