This document defines key terms and discusses physical and chemical changes in matter. It defines porosity, density, and biodegradability. Physical changes alter a material's appearance through processes like bending, cutting, and melting, which change size and shape but not composition. Chemical changes produce new substances through chemical reactions like burning and rusting. The document provides examples of physical changes like phase changes and chemical changes like cooking and provides a review questions to test the reader's understanding.

1. TEACHER HAIZEL

2. WHAT IS POROSITY ?
- a property of a material that
lets it absorb water and other
liquids
REVIEW

3. - It is the amount of matter
that an object has, related
to mass and volume of an
object.
WHAT IS DENSITY?

4. -It is the ability of the
materials which can easily rot
and decay.
WHAT IS BIODEGRADABILITY?

5. CHANGES
IN MATERIALS

6. WHAT HAVE YOU SEEN IN THE
PICTURE ?

7. TWO CHANGES IN MATTER
1. PHYSICAL CHANGE
• It is the change in the appearance of the
materials such as: size, shape and other
physical characteristics.
• Ways: Bending (like bending of steel),
Cutting, tearing, shattering, grinding, and
mixing are further types of physical
changes because they change the form
but not the composition of a material..

8. Phase changes are changes
that occur when substances are
melted, frozen, boiled, condensed,
sublimated, or deposited. They are
also physical changes because they
do not change the nature of the
substance.

9. EXAMPLES OF PHYSICAL CHANGES IN
MATTER

10. 2. CHEMICAL CHANGE
• It happens when chemical composition
of a substance is affected.
• Chemical changes are also known as
chemical reactions.
• Ways : Rotting, burning, cooking, and
rusting are all further types of
chemical changes because they
produce substances that are entirely
new chemical compounds.

11. An unexpected color change or
release of odor also often indicates
a chemical change. For example:
The heat from cooking an egg
changes the interactions and
shapes of the proteins in the egg
white, thereby changing its
molecular structure and converting
the egg white from translucent to
opaque.

12. EXAMPLES OF CHEMICAL CHANGES IN
MATTER

14. IDENTIFY IF IT IS PHYSICAL CHANGE OR CHEMICAL
CHANGE

15. TELL IF IT IS PHYSICAL OR
CHEMICAL CHANGE
PHYSICAL CHANGE CHEMICAL CHANGE

16. PHYSICAL CHANGE
CHEMICAL CHANGE

17. PHYSICAL CHANGE
CHEMICAL CHANGE

18. ANSWER :
Differentiate physical
and chemical change?

19. THANK YOU FOR
YOUR
PARTICIPATION