Tuguegarao Archdiocesan Schools System
Saint Joseph’s College of Baggao, Inc.
Baggao, Cagayan, Philippines
Transforming Lives, Shaping the Future
Subject Science Grade Level 4
Teacher PREXY GRACE A. RAMER Term and A.Y. 2020-2021
Name: _____________________________________________________________________
MODULE 3
PHYSICAL AND CHEMICAL CHANGES IN MATTER
I. Overview
Physical change is when a material changes only on its appearance or state and no new materials
formed. There are changes in state due to change in temperature: melting, freezing, evaporation,
condensation, sublimation and deposition.
Chemical change is when one or more new substances are formed. It affects the chemical
properties.
II. Intended Learning Outcomes:
a. Explain what cause changes in the appearance of certain objects;
b. Predict the changes in the state of matter when exposed to different temperature;
c. Differentiate physical from chemical changes in matter.
III. Learning References:
1. T.R.E.K. 4 (Technology. Research. Experiment. Knowledge)
By: Geraldine O. Magbanua
IV. Content/ Lecture: (4 hours)
Hello kids! How are you?
For this time, you will learn about physical and chemical changes in matter.
Solid materials have definite shape and volume, right? They have different characteristics or
properties such as shape, color, size, texture and weight.
These materials can be changed by cutting, pounding, tearing, folding, twisting, bending, stretching,
pressing, coloring, melting and other physical pressure. The change is considered a physical change. It is
when a material changes only in its appearance or state. Physical changes affect the physical property of
matter.
Changes in State Due to Change in Temperature
There are changes physically in matter from on state to another due to presence or absence of
heat.
1. Melting – it is the process from solid to liquid due the presence of heat. For example, when an ice cube
left outside the freezer, it would melt into a liquid as it gains heat.
Solids melt at different temperatures. Like, ice cream melts at room temperature. A chocolate bar
will melt in your hand. And candies melt in your mouth.
2. Freezing – is the process from liquid to slid due the absence of heat. When liquid water loses heat, it
hardens and becomes solid. For example, a liquid water placed in the freezer will become solid (ice).
3. Evaporation – from liquid to gas due the presence of heat. Like the water when heated it will turn into
gas. Liquid changes to gas when it gains heat.
4. Condensation – the process to liquid due the absence of heat. When heat is removed from gas, it will
change from gas to liquid. For example, Having a cold soda on a hot day, the can "sweats." Water
molecules in the air as a vapor hit the colder surface of the can and turn into liquid water.
5. Sublimation – it is from solid to gas due to presence of heat. Have you ever seen your mom putting
mothballs in clothes as to avoid the insects? And if you search for it after a few days either you will get a
ball with very much reduced size or you won't get it. So where do it goes. Here it comes, it gets sublime and
the solid converts directly into gas.
6. Deposition – it is from gas to solid due the absence of heat. When enough heat is taken into a gas, it
changes into a solid. Like dry ice is cooled carbon dioxide gas. It is made under very low temperature.
Chemical Changes in Materials
Chemical changes take place in many things around us. It is irreversible or cannot be reversed. One
or more new substances are formed from chemical change.
When you light the wood up, it would burn gently. After a while, it produces a new substance called
ashes. The ashes from the burning wood have an entirely new molecular composition. It can never turn
back to wood again.
There are two types of changes in matter: physical change and the chemical change.
Here are some differences between Physical and Chemical changes in matter.
PHYSICAL CHANGE CHEMICAL CHANGE
Affects the physical properties of matter. A broken Affects the chemical properties of matter. The
bottle is no longer whole. Its size and shape differ molecular composition of wood, when burned and
from its original form. turned to ashes, is permanently altered
Does not produce a new kind of matter. Like a Produces a new kind of matter, which is completely
pencil that was cut in half remains a pencil. different from the original matter. A rusted nail
developed rust, a new material, as a nail
underwent chemical change.
Sometimes, physical change can be reversed. Just Produces an irreversible change. We cannot a cake
like water turning to ice when frozen and ice back to its ingredients, nor ashes back to wood.
turning back to water. at other times, physical
change cannot be reversed. Like an egg that was
cracked open is an irreversible.
V. Learning Activity/Supplementary Activity
On you book, page 44-45 answer cool down, letter A and B.
VI. Generalization
Physical change is when a material changes only on its appearance or state and no new materials
formed.
There are changes in state due to change in temperature: melting, freezing, evaporation,
condensation, sublimation and deposition.
Melting – it is the process from solid to liquid due the presence of heat.
Freezing – is the process from liquid to slid due the absence of heat.
Evaporation – from liquid to gas due the presence of heat.
Condensation – the process to liquid due the absence of heat.
Sublimation – it is from solid to gas due to presence of heat.
Deposition – it is from gas to solid due the absence of heat.
Chemical change is when one or more new substances are formed. It affects the chemical
properties.
VII. Assessment
Write what are the changes in the state of matter when exposed to different temperature. (melting,
freezing, evaporation, condensation, sublimation and deposition).
___________ 1. Ice turned into water
___________ 2. Mothballs turning to gas
___________ 3. Clouds to drop water
___________ 4. Fog
___________ 5. A water turns into an ice
VIII. Application
On you book, answer on page 36-37.
