Physical and chemical changes in matter can impact both people and the environment. Changes in matter through technological advancements have made work easier for people but also increased energy usage. While appliances improve living standards, their widespread use also contributes to air and water pollution. Physical changes alter the size or shape of a substance without forming new ones, while chemical changes produce different substances through molecular rearrangements.

1. PHYSICAL AND CHEMICAL

2. INVESTIGATE!!!
Did you notice the changes that you experienced as you grow
older?
Did you notice the changes in your body, size, weight, and height?
Do you agree that these ar among some changes in you as matter?

3. IMPACT OF CHANGE
BECAUSE OF CHANGE:
- Work has become easier and more comfortable to people.
- Unlike in the past, work today are aided with modern tools, and
equipment, many task get easier and faster to do.
- Increase the productivity of people, many output at a shorter
time because of technological advancement/changes.

4. IMPACT OF CHANGE
BECAUSE OF CHANGE:
- It leads to technological advancements that contributed much in
the field of sciences.
- Matter develops into a new thing

5. KINDS OF CHANGE IN MATTER
1. PHYSICAL CHANGE
2. CHEMICAL CHANGE
These changes occur when:
- Exposed to different condition,
- Addition of heat energy
- Removal of heat energy
- Mixed with other materials

6. PHYSICAL CHANGE
- Change occur in the size, shape, or state of matter without forming a
new substance.
Example:
1. Tearing up a paper – from a whole single paper when tore up into
pieces, it changes its size but still the components is paper.
2. Pounding a chalk – from a whole chalk pounded becomes powder,
still the components is chalk.

7. Types of changes
- Evaporation
- Condensation
- Melting
- Freezing
- Sublimation
- deposition

8. EVAPORATION – Changes from liquid to gas
- it happens when heat energy is applied to a liquid substances.
Example: boiling a water, you can observe that once the water boils it
produces steams (vapor)
CONDENSATION – Changes from gas to liquid
- it happens when vapor cools down, and become
water
Example: sweats around the glass of cold/hot water

9. EVAPORATION CONDENSATION

10. MELTING / FUSION– Changes from solid to liquid
- it occurs when there is an addition or application of heat energy
Example: putting a solid chocolate under the heat of the sun – it will melt.
butter placed in a hot cooking pan – it will melt.
FREEZING OR SOLIDIFICATION – Changes from liquid to solid
- it occurs when place liquid substances into a cool place
or room with low temperature.
Example: placing a water into the freezer – it becomes ice
in other countries during winter their bodies of water
like streams becomes ice.

11. SUBLIMATION – Changes from solid to gas
Example: a naphthalene balls or moth balls is a white stone-like substance used
to ward off insects, when it is placed in an area for one hour it releases smells
and the ball gets smaller as the time passes.
DEPOSITION – Changes from gas to solid
Example: frost in the freezer (it occurs when the sublimated
ice forms frost without passing through liquid state)
carbon dioxide into dry ice

12. COMPRESSING – is the act of compressing the oxygen gas into liquid
oxygen under high pressure and low temperature. The same with
carbon dioxide gas. Through this process products like soda or soft
drinks are made.

13. - a substance made by mixing other substances
together.

14. – is one type of homogeneous mixture. It is
composed of two or more substances. Ex.
– is a substance that dissolves another
substance. Ex.
- is the substance that is dissolved. Ex.
– if the substance can be dissolved
by the solvent. Ex. .
– if the substance can’t be dissolved by the
solvent. Ex.

15. CHEMICAL CHANGE
- Its chemical composition is altered, causing the original
substance to be replaced by one or more new substance.
Example: burning logs – when heat is applied to the logs, the
components of the wood react with the oxygen in the air,
thus forming the smoke and ashes. In this instance you can no
longer distinguish the wood from the smoke or ashes.
mixing vinegar and milk – produces foul odor and taste
mixing baking soda and vinegar/mentos – produces
bubbles.

16. KEY DIFFERENCES BETWEEN PHYSICAL CHANGE
AND CHEMICAL CHANGE

17. EFFECTS OF CHANGES
IN
MATTER

18. EFFECTS ON PEOPLE
 Technologies and appliances become handy
 Gadgets can be easily be fir in the pocket unlike in the past
 Technological advancements make work easier and faster
 Communication is more convenient
 Development of air conditioner controls the temperature
and humidity in an enclosed area
 BUT! Air conditioner can transmit airborne diseases easily,
requires huge amount of electric energy, more energy
used more fossil fuels burnt meaning it produces gases
that is harmful to humans and also with the environment.

19. EFFECTS ON THE ENVIRONMENT
 Changes in matter may increase the production of food
supply and other materials.
 Continuity supply of water
 Enough supply of water for plants, and other living things.
 BUT! Because of pollution rainwater becomes hazardous
because it contains high amount of acid or also known as
acid rain.
 Acid rain removes important minerals for plants and
animals, that will affect their growth.
 It also causes death of fishes, and contaminates the
drinking water of people.