1. CHANGES THAT
MATERIALS
UNDERGO

2. Learning Objectives:
The learners demonstrate understanding of
materials undergo changes due to oxygen and
heat;
Investigate changes that happen in materials
under the following conditions; presence or lack
of oxygen and application of heat. And;
Identify the physical properties of solid
materials such as ductility, malleability, flexibility,
elasticity, porosity, hardness and brittleness.
1.
2.
3.

3. Activity #1:
Classify each materials as useful or harmful.
Old news paper
vegetable scraps
old toys
lotion
insect repellent
medicines
paint
drugs

4. Let us Review 💡
Identify the following objects as solid, liquid, gas.
Write your answer on the blank after the number.
Vinegar
Stars
Chalk
Smoke
Paper
Air
1.
2.
3.
4.
5.
6.

5. Physical
Physical
Properties of
Properties of
Solid
Solid
Materials
Materials

6. Ductility
Property of solid to be
transformed into wires.
EXAMPLES: Aluminum,
Copper, Gold, Silver

7. Porosity
the ability of a material to
hold liquid to a certain
extent.
EXAMPLES: Sponge, Cotton,
Fabric

8. property of solid to
be broken into
pieces.
EXAMPLES:
Ceramics, Glass
Brittleness

9. property of solid to return
to its original shape after
being streched.
EXAMPLE: Rubber bands,
tires, baloons
ELASTICITY

10. Property of solid to be
hammered into sheets.
Example: Tin cans, aliminum
sheet
Malleability

11. the ability of the material
to be bent without breaking
EXAMPLES: Plastic Ruler,
Alambre, Paper Clips
Flexibility
Flexibility

12. Magnetic
the ability to
attract material.
Example: Magnet

13. HARDNESS
the ability of a
material to resist after
being pressed and
scratched.
EXAMPLE: Diamond,
Metal, Wood

14. EVALUATION
Identify the physical properties of solid materials.

15. Assignment
Assignment
List atleast 3 examples of solid materials in your
home that possess the following properties.
1. Porosity
2. Brittleness
3. Elasticity