Changes that materials undergo

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.
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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
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2.
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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