CHANGES IN MATTER
1) USING the RECYCLED PAPER, CREATE A SYMBOL THAT
WILL REPRESENT YOUR GROUP FOR THIS QUARTER.
2) YOUR SYMBOL SHOULD HAVE A RELATION WITH
CHEMISTRY.
3) YOU ARE ONLY GIVEN 10 MINUTES TO CREATE YOUR
SYMBOL.
4) YOU WILL BE GRADED ACCORDING TO THE
FOLLOWING:
a) Creativity - 5
b) Originality- 5
c) Compliance - 5
d) Content – 10
TOTAL : 25 pts.
TO DETERMINE IF CHANGE IS
PHYSICAL OR CHEMICAL, ANSWER
THE FOLLOWING QUESTIONS:
1)Do you still have the same object you started
with?
2) Can it be changed back to its original form or is
it reversible?
If both YES – PHYSICAL
change has occurred.
If a NO is answered in any of
the questions – CHEMICAL
change has occurred.
PHYSICAL CHANGE is a reversible change that
affects the physical property of a substance but
NOT its composition.
CHEMICAL CHANGE is an irreversible change
that alters the composition of a substance.
+
Na
REACTANT
(original substance)
Cl
REACTANT
(original substance)
NaCl
PRODUCT
(new substance)
The reaction is ALWAYS accompanied by ENERGY change. (heat, light and
electrical)
Chemical change has occurred if one can see
these evidences or signs during the reaction.
evolution of
gas
Evolution of heat and
light
Chemical change has occurred if one can see
these evidences or signs during the reaction.
Formation of a precipitate (insoluble substance)
Chemical change has occurred if one can see
these evidences or signs during the reaction.
Production of
Mechanical energy
Production of
Electrical energy
NUCLEAR CHANGE is the alteration in the
nucleus of the atom and may change the
identity of the atom.
Natural Radioactivity
Artificial Radioactivity
NUCLEAR CHANGE is the alteration in the
nucleus of the atom and may change the
identity of the atom.
Nuclear Fusion
(combining)
Nuclear Fission
(splitting)
Classify if it’s a Physical or Chemical
Change
Banana Browning
Chemical
Salt dissolving in water
Physical
Tin alloy melts at 505 K
Physical
Gasoline igniting
Chemical
Milk souring
Chemical
Iron bolt rusting
Chemical
Wine turning to vinegar
Chemical
Alcohol evaporating
Physical
Silver table spoon tarnishes
Chemical
Physical
Water turns to vapor
Acknowledgements & References
Dr. Richard Gross Chemistry Professor
Ateneo De Manila University
Silberberg,M., Chemistry: The Molecular Nature of Matter &
Change. McGraw Hill International 2007
Chang, R. Chemistry. 7th edition. McGraw Hill International
2002