WHAT
CHANGES?
THINGS
What are things made from?
MATERIALS
How do we classify the materials?
What changes do we observe everyday?
MATERIALS
Solid Materials
MATERIALS
We use wood, metal, glass, plastic, and fabric to make
most everyday object
Materials can be natural materials and artificial/manmade materials
NATURAL
MATERIALS
They are those that are obtained directly from nature and can
have animal, vegetable or mineral origin. For instance: earth,
silver, wool.
ARTIFICIAL
MATERIALS
They are those that are obtained from the transformation of
natural materials and that are used to make products. For
instance: paper, plastic, rubber.
FOOD FROM ARTIFICIAL
MATERIALS
PURITY
What does the purity mean in science?
What prevents us from giving access to pure
water to everyone?
MIXTURE
A SUBSTANCE MADE BY
MIXING OTHER SUBSTANCES
TOGETHER.
MIXTURE
2 KINDS OF MIXTURE
HOMOGENEOUS MIXTURE
HETEROGENEOUS
MIXTURE
WATER AND SAND
MIXTURE
HOMOGENEOUS
MIXTURES
–APPEAR TO BE THE
SAME THROUGHOUT
–“WELL MIXED”-IT
CALLS SOLUTIONS
–PARTICLES ARE VERY
SMALL-CAN’T BE SEEN
SOLUTIONS
•A TYPE OF
HOMOGENEOUS
MIXTURE FORMED
WHEN ONE SUBSTANCE
DISSOLVES IN
ANOTHER
•“BEST MIXED” OF ALL
MIXTURES
WATER IS THE MOST
COMMON SOLVENT
WATER IS THE
“UNIVERSAL
SOLVENT”, SINCE IT
CAN DISSOLVE MANY
SUBSTANCES
SOLUBILITY
SOLUTE: THE SUBSTANCE THAT IS DISSOLVED IN A
SOLUTION
SOLVENT: THE SUBSTANCE THAT DOES THE
DISSOLVING IN A SOLUTION
MIXTURE
HETEROGENEOUS MIXTURES
–DO NOT APPEAR THE
“SAME” THROUGHOUT
–“LEAST MIXED”- IT CALLS
SUSPENSIONS
–PARTICLES ARE LARGE
ENOUGH TO BE SEEN
SUSPENSIONS
SYSTEM DOES NOT STAYS
STABLE AND SETTLE
PHYSICAL CHANGES
Does not alter the chemical composition or identity of the substance,
only the form.
-Melting ice (change in state or phase)
-Freezing Kool-aid
-Tearing paper
-Boiling water (change in state or phase)
-Stretching silly putty
-Making a mixture (ex. Sugar water)
-Unmixing a mixture (ex. sorting)
Seatwork
Can the states of
matter change?
What factors
change it?
Discuss it and make a simple group
report with your desk-mate!
CHEMICAL CHANGES
Does alter the chemical composition or identity of a
substance and makes new substances.
-Burning paper
-Digesting food
-Rotting
-Iron reacting with oxygen gas
A chemical change is also called a chemical reaction.
QUESTIONS
How might physical and chemical changes help us to manipulate materials?
From today's lesson,
we can summarize it into these few points
Lesson
Summar
y
There are three main
states of matter
The states may change
due to several factors
The change of states can
provide many benefits for life
DISCUSS WITH YOUR GROUP
1. THE DIFFERENCE AND
SIMILIARITY BETWEEN
CHEMICAL CHANGES AND
PHYSICAL CHANGES