7
SCIENCE
Third Quarter – Module 5
Heat Transfer
Department of Education ● Republic of the Philippines
7
Science – Grade 7
Alternative Delivery Mode
Third Quarter – Module 5: Heat Transfer
First Edition, 2020
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Published by the Department of Education
Regional Director: Dr. Arturo B. Bayocot, CESO III
Asst. Regional Director : Dr. Victor G. De Gracia Jr. CESO V
Development Team of the Module
Author/s:
Reviewers:
Janeth D. Arabes
Bonito Ferdinand L. Taclob
Daisy S. Amparado
Illustrator and Layout Artist: Vernie P. Bacayo
Evaluators:
Maricel B. Compania
Ivan M. Guillena
Carmen S. Madrio
Michelle S. Balat
Management Team
Chairperson:
Dr. Arturo B. Bayocot, CESO III
Regional Director
Co-Chairpersons:
Ramon L. Matunog
Philip Ronald Ducoyan
Patrick Dennis J. Antipala
Emmie J. Prince
Rolando T. Luna
Marisol P. Moreno
Dr. Victor G. De Gracia Jr. CESO V
Asst. Regional Director
Edwin R. Maribojoc, EdD, CESO VI
Schools Division Superintendent
Myra P. Mebato,PhD, CESE
Assistant Schools Division Superintendent
Mala Epra B. Magnaong, Chief ES, CLMD
Members
Neil A. Improgo, EPS-LRMS
Bienvenido U. Tagolimot, Jr., EPS-ADM
Samuel C. Silacan, EdD, CID Chief
Marites A. Caguindangan, EPS - Science
Rone Ray M. Portacion, EdD, EPS – LRMS
Asela I. Elumbareng, EdD, PSDS
Nelia T. Lanzaderas, PhD, Principal III/District In-charge
Agnes P. Gonzales, PDO II
Vilma M. Inso, Librarian II
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8
7
Science
Third Quarter – Module 5
Heat Transfer
This instructional material was collaboratively developed
and reviewed by educators from public schools. We encourage
teachers and other education stakeholders to email their
feedback, comments, and recommendations to the Department
of Education - Region 10 at region10@deped.gov.ph.
Your feedback and recommendations are highly valued.
Department of Education ● Republic of the Philippines
9
Introductory Message
For the learner:
Welcome to the Science 7 Alternative Delivery Mode (ADM) Module on
Heat Transfer!
The hand is one of the most symbolized parts of the human body. It is
often used to depict skill, action and purpose. Through our hands we may learn,
create and accomplish. Hence, the hand in this learning resource signifies that
you as a learner is capable and empowered to successfully achieve the relevant
competencies and skills at your own pace and time. Your academic success
lies in your own hands.
This module was designed to provide you with fun and meaningful
opportunities for guided and independent learning at your own pace and time.
You will be enabled to process the contents of the learning resource while being
an active learner.
This module has the following parts and corresponding icons:
What I Need to Know
This gives you an idea of the skills or
competencies you are expected to learn in
the module.
What I Know
This part includes an activity that aims to
check what you already know about the
lesson to take. If you get all the answers
correct (100%), you may decide to skip this
module.
What’s In
This is a brief drill or review to help you link
the current lesson with the previous one.
What’s New
In this portion, the new lesson is introduced
to you in various ways such as a story, a
song, a poem, a problem opener, an activity
or a situation.
What is It
This section provides a brief discussion of the
lesson. This aims to help you discover and
understand new concepts and skills.
What’s More
This comprises activities for independent
practice to solidify your understanding and
skills of the topic. You may check the
iv
answers to the exercises using the Answer
Key at the end of the module.
What I Have Learned
This
includes
questions
or
blank
sentence/paragraph to be filled in to process
what you learned from the lesson.
What I Can Do
This section provides an activity which will
help you transfer your new knowledge or skill
into real-life situations or concerns.
Assessment
This is a task which aims to evaluate your
level of mastery in achieving the learning
competency.
Additional Activities
In this portion, another activity will be given to
you to enrich your knowledge or skill of the
lesson learned. This also tends the retention
of learned concepts.
Answer Key
This contains answers to all activities in the
module.
At the end of this module you will also find:
References
This is a list of all sources used in developing
this module.
The following are some reminders in using this module:
1. Use the module with care. Do not put unnecessary mark/s on any part of the
module. Use your Science activity notebook in answering the exercises.
2. Don’t forget to answer What I Know before moving on to the other activities
included in the module.
3. Read the instruction carefully before doing each task.
4. Observe honesty and integrity in doing the tasks and checking your answers.
5. Finish the task at hand before proceeding to the next.
6. Return this module to your teacher/facilitator once you are through with it.
If you encounter any difficulty in answering the tasks in this module, do not
hesitate to consult your teacher or facilitator. Always bear in mind that you are not
alone. We hope that through this material, you will experience meaningful learning and
gain a deep understanding of the relevant competencies. You can do it!
v
Table of Contents
What I Need to Know
----------------
1
What I Know
----------------
2
Lesson 1: Heat Transfer
----------------
4
What’s In
----------------
4
What’s New
----------------
5
What is It
----------------
6
What’s More
----------------
7
Lesson 2: Conduction
----------------
8
What’s In
----------------
8
What’s New
----------------
9
What is It
----------------
10
What’s More
----------------
11
Lesson 3: Convection
----------------
12
What’s In
----------------
12
What’s New
----------------
13
What is It
----------------
14
What’s More
----------------
15
Lesson 4: Radiation
----------------
16
What’s In
----------------
16
What’s New
----------------
17
What is It
----------------
17
What’s More
----------------
19
What I Have Learned
----------------
20
What I Can Do
----------------
21
Assessment
----------------
22
Additional Activities
----------------
24
Answer Key
----------------
25
References
----------------
27
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What I Need to Know
This module was designed and written with you in mind. It is here to help
you understand more about heat as a form of energy that is always moving
from one object or place to another. The scope of this module permits it to be
used in many different learning situations. The language used recognizes the
diverse vocabulary level of students. The lessons are arranged to follow the
standard sequence of the course. But the order in which you read them can be
changed to correspond with the textbook you are now using.
This module consists of four lessons, namely:

Lesson 1 – Heat Transfer

Lesson 2 - Conduction

Lesson 3 – Convection

Lesson 4 – Radiation
After going through this module, you are expected to infer the conditions
necessary for heat transfer to occur (G7FE-IIIh-i-12). Specifically, you should
be able to:
1. trace the direction of heat as it transfers from one object to another;
and
2. describe the transfer of heat through conduction, convection and
radiation.
1
What I Know
Directions: Read the questions carefully and choose the letter of the correct
answer. Write your answers in your Science activity notebook.
1. Which of the following always moves from hotter to colder object?
A. Heat
B. Light
C. Sound
D. Temperature
2. What is needed for heat to transfer from one object to another? The two
objects should __________
A. have equal temperature.
B. have different temperature.
C. always be in contact for heat to travel through.
D. always be inside a vacuum or empty space for heat to travel through.
3. A small cup of cold milk is being poured into a big mug half-filled with hot
coffee. Which is true about heat transfer in this situation?
A. Cold milk transfers heat to the hot coffee.
B. Hot coffee transfers heat to the cold milk.
C. Both liquids absorb heat from each other.
D. Heat will not transfer to either of the liquids.
4. What will eventually happen if you leave a bowl of hot soup for an hour on
top of the table in your room?
A. The soup will become colder than the room.
B. The room will become hotter than the hot soup.
C. Heat from the room will transfer to the hot soup.
D. Hot soup will eventually cool down to room temperature.
5. Which of the following processes involves heat transfer by direct contact
between objects?
A. Conduction
B. Convection
C. Emission
D. Radiation
6. Which material is best to be used as kettle pot handle to keep your hand
from being burned when holding it while cooking?
A. Copper
B. Plastic
C. Steel
2
D. Wood
7. Which method of heat transfer makes the entire pot of water boil over the
hot stove?
A. Conduction
B. Convection
C. Evaporation
D. Radiation
8. Which is the correct sequence of events as convection current occurs in
boiling water in a pot placed over a hot stove?
i.
Bottom part of the pot conducts heat to the water.
ii. The cool, denser water on top will sink.
iii. Heated water at the bottom becomes less dense then rise.
iv. Hot stove conducts heat to the bottom of the pot.
A. i, ii, iii, iv
B. iii, iv, ii, i
C. iv, i, iii, ii
D. ii, iii, I, iv
9. Which is true about heat transfer by radiation?
A. Heat moves through waves.
B. Heat cannot transfer without matter.
C. Direct contact by touching is needed for heat to transfer.
D. Actual movement of matter is needed for heat to transfer.
10. How does heat transfer from the sun to the earth? Heat transfers by
A. conduction.
B. convection.
C. dispersion.
D. radiation.
11. Which of the following examples involves heat transfer by conduction?
A. Sitting beside a bonfire
C. Sun shining on the earth
B. Drying hair with a blower
D. Walking on hot sand without slippers
12. Which of the following household chores involves convection of heat?
A. Ironing rumpled clothes.
C. Frying egg for breakfast.
B. Boiling water for the coffee.
D. Drying clothes in the clothes line.
13. Which of the following situations involves heat transfer by radiation?
A. Smoke rising
C. Getting sunburn
B. Touching burning coal
D. Cooling juice in a refrigerator
14. Why is a light colored shirt preferable to wear during hot days than dark
colored ones?
A. It absorbs more heat.
C. It is a good insulator of heat.
B. It absorbs less heat.
D. It is a good conductor of heat.
15. Which one is a benefit of heat transfer by convection?
A. It cools down hot coffee.
C. It causes smoke to rise.
B. It gives energy for plants to grow. D. It makes frying of food possible.
3
Lesson
Heat Transfer
1
What’s In
Energy is the ability to do work or cause change. It is present in nature
in many different forms. In your previous modules you were studying about
sound and light energy. This time you will be learning another form of energy.
Let’s check what you have learned about some forms of energy.
Activity 1. Match Me!
Directions: Match the forms of energy in the first column to their
corresponding pictures and descriptions in the second column.
Write the letter of your answer in your Science activity notebook.
Form of Energy
Description
1. Sound
A. Energy that we can feel.
2. Light
B. Energy that we can hear.
3. Heat
C. Energy that we can see.
Very good! Your answers are correct!
4
What’s New
I am sure you have experienced touching a mug of hot coffee or taking
out pieces of ice cubes from your freezer, right? These experiences have
something to do with heat. Heat is usually associated with temperature.
You can explore more about heat and the necessary conditions for it to
be transferred from one object to another by performing the next activity.
Activity 2. Warm me up!
(This activity is adapted from the Science 7 Learner’s Material but is revised on the
assumption that the learners have no laboratory thermometer in their homes.)
Reminders: Ask assistance from your parents or any responsible member of
the family while performing this activity to ensure safety, especially
when using hot water.
NEVER dip your hands in hot water!
Materials:
Tap water (Water from the faucet)
2 Small containers
Hot Water
2 Big containers
Procedure:
1. On top of your table prepare the setup as shown in figure 1 below.
Right hand
Tap
water
Left hand
Small
Container
Tap
water
Hot
water
Tap
water
SET UP 1
Figure 1. The Experimental Set Up
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Big
Container
SET UP 2
2. After you have prepared all the materials, simultaneously dip your right
hand in the small container of set up 1 and your left hand in the small
container of set up 2 for two minutes.
3. Write your observations by answering the questions in your Science
activity notebook.
Questions:
Q1. In which set up your hand did NOT feel change in temperature?
Q2. In which set up your hand did feel change in temperature?
Q3. In which set up is heat transfer taking place?
Q4. What is then the condition necessary for heat to transfer between
objects? Objects must have ____________.
(the same temperature or different temperature)
Q5. What do you think is the direction of heat transfer in this set up?
(from tap water to hot water or from hot water to tap water)
What is It
Heat is a form of energy that is always moving from one object to
another. Heat energy will only transfer if there is difference in temperature
between two objects. In set up 1 of your activity, there was no heat transfer
since the water in the big and small containers have the same temperature. But
in set up 2, heat transferred from the big container (with hot water) to the small
container (with cold water). The transfer of heat in this set up will stop as soon
as the temperature of the water in the two containers become equal. The
direction of heat transfer will always be from higher temperature (hot) to lower
temperature (cold).
Figure 2. Direction of heat transfer
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What’s More
Activity 3. Which Way to Go?
Directions: Given the situations below, identify which object has higher
temperature and which has lower temperature. Trace the direction
of heat flow using an arrow. Write your answer in your Science
activity notebook. (Note: Example is provided for you.)
Object with
Object with Direction of
Situation
Higher
Lower
Heat
Temperature Temperature
Transfer
Example: Taking frozen
food from the freezer with
your hand
hand
food
hand  food
1. Walking on the road at
noon time with bare feet
2. Drying clothes under the
sun
3. Sun shines on earth
4. Roasting chicken in a fire
5. Drying hair using blower
Now, you know already the conditions for heat to transfer. But how
exactly is heat being transferred? There are three methods by which heat can
be transferred from one object or place to another. You will learn about these
methods in the next three lessons of this module.
7
Lesson
Conduction
2
What’s In
Activity 1. Feeling Hot or Cold?
Directions: Study the pictures below. Fill in the blanks based on your
observations in the given situation. Write your answer in your
Science activity notebook.
A
In picture A, what can you say about the
temperature of hot and cold objects?
(high or low)
Hot object
_____________
Cold object _____________
hand
B
hot cup
Heat transfers from the ______ to the
girl’s _______.
ice cube
Heat transfers from the __________ to the
____________.
C
hand
8
What’s New
Activity 2. Ouch! It’s hot!
Reminders: Ask assistance from your parents or older member of the
family to ensure your safety in doing this activity.
Be careful in pouring hot water
in the cup!
Materials:
Cup with ¾ hot water
Metal Spoon
Procedure:
1. Fill a cup with three-fourths (3/4) of
hot water.
2. Dip a metal spoon in the hot water.
3. After two minutes, touch the spoon
handle.
4. Write your observations by answering
Figure 3. A cup with hot water
the questions below in your Science
activity notebook.
Questions:
1. What did you feel when you touch the spoon handle?
2. Did your hand directly touch the hot water?
3. Was heat being transferred to your hand?
4. In what direction did the heat transfer? Choose between A and B.
A. hand  spoon  water
B. water  spoon  hand
Very good! Your observations are correct!
9
What is It
In activity 2, heat is being transferred from the hot water to your hand by
conduction. Conduction is the transfer of heat through direct contact between
objects. Hot water transferred heat to the spoon. Heat then transferred from the
spoon to your hand.
Figure 4. Arrows showing direction of heat transfer
Conduction can occur in solid, liquid and gas, but it is best observed in
solids. Not all materials conduct heat equally. Some materials readily transfer
heat and they are called conductors. Metals like silver, copper, steel, and
aluminum are good conductors of heat. These materials are commonly used as
heating devices at home like cooking utensils. There are also materials that
conduct heat poorly. They are called insulators. Examples of these are rubber,
plastic, wood, fabrics, water, and air. Insulators are also used in cooking
utensils to prevent burning one’s hand while in contact with hot objects.
10
What’s More
Activity 3. Picture Talk
Directions: Study the picture below and answer the given questions. Choose
your answer from the word pool placed beside the picture. Write
your answer in your Science activity notebook.
WORD POOL
Kettle pot
Hot stove
Insulator
Conduction
Figure 5. Lifting a pot from a hot stove
Questions:
1. What is the source of heat in this picture? _______
2. What material is in direct contact of the source of heat? _______
3. How is heat transferred from the source to the kettle pot? _____________
4. Why is cloth pot holder used in holding the metal handle of the kettle pot?
It serves as __________ to prevent the hand from burning.
Excellent! All of your answers are correct! You are now ready for the
next lesson.
11
Lesson
3
Convection
What’s In
Before you will proceed to the next method of heat transfer, let’s check
what you have learned about heat transfer by conduction.
Activity 1: TRUE or FALSE
Directions: In your Science activity notebook, draw a happy face
statement is true and sad face
if the
if the statement is false.
Statements
Reaction
Example:
Heat transfer will stop if the two objects have already
exchanged temperatures.
1. Heat will transfer only when two objects have different
temperatures.
2. Heat transfers from colder to hotter objects.
3. A plastic spoon is a good heat conductor while a metal
spoon is a good heat insulator.
4. Ironing clothes is an example of conduction of heat.
5. Conduction happens only in solid objects.
Wow! You’ve got them right!
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What’s New
Activity 2: Moving the Seeds Up and Down!
Reminders: This activity needs close supervision by your parents or any
responsible member of the family since you will be dealing with
fire and boiling water.
Be careful in building fire or turning
on the stove!
Materials:
Kettle or any cooking pot
Water
Cooking stove or “Sug-ang”
Mongo Seeds
Match or Lighter
Firewood or LPG
Procedure:
1. Half-fill the kettle with water.
2. Place it on top of a burning firewood or stove.
3. Put two spoonful of mongo seeds in the
kettle (figure 6).
4. Wait until the water boils and observe
what will happen to the mongo seeds.
5. Write your observations in your Science
activity notebook.
Figure 6. Boiling water with
mongo seeds
Questions:
1. What happened to the water as it starts to boil?
___________________________________________________________
2. What happened to the mongo seeds as the water continues to boil?
____________________________________________________________
Amazing! You have perfect observations!
13
What is It
Based on the experiment, when the kettle was placed on top of the
burning firewood or stove, the metal part at the bottom of the kettle is heated.
As the metal is heated it begins to conduct heat to the water at the bottom of
the kettle. The heated water becomes less dense and moves up to the surface;
the cold water at the surface is more dense and moves downward. The
circulating current of water can be clearly seen through the mongo seeds that
move up and down together with the water as the boiling continues.
Figure 7. Mongo seeds move up and down in boiling water
Heat is transferred from the bottom to the surface of the water by
convection. Convection is the transfer of heat by the actual movement of fluids
such as liquid (like water) or gases (like air) from one place to another.
Another example of heat transfer by convection is the rising of hot air
above the flame and the moving down of air as it cooled down.
14
What’s More
Activity 3. Smoke Roller Coaster!
Reminders: Ask assistance from your parents or any responsible member of
the family in performing this activity.
Be careful in holding the lighted rolled
paper!
Materials:
Rolled Paper
Cardboard
Glass Jar
Small candle
Lighter or Match
Procedure:
1. Prepare the set up as shown in figure 8 below.
2. Light the end of the rolled paper and
place it on the opposite side of the
lighted candle.
3. Observe what happens to the smoke
from the rolled paper.
4. Write your observations by answering
the questions in your Science activity
notebook.
Figure 8. Improvised Two
Chimney Set up
Questions:
1. What happened to the smoke from the rolled paper?
(move up or move down)
2. Where did the smoke go on the side of the lighted candle? (up or down)
3. Why do you think the smoke moved in this way? It is because the side of the
lighted candle is _______ (hotter or colder) than the opposite side.
That’s awesome! Your answers are all correct!
You can now proceed to the last method of heat transfer.
15
5
Lesson
Radiation
4
What’s In
Before you will explore the third method, let us check what you have
learned about conduction and convection.
Activity 1. Crossword Puzzle
Directions: Copy the puzzle in your Science activity notebook and fill in the
boxes based on the given clue statements. Choose your answer
from the word pool. (Note: Number 1 is done for you.)
5
6
4
3
WORD POOL
2
1
S
I
N
RISE
SINK
STEEL
WOOD
CONVECTION CONDUCTION
HEAT
K
Horizontal
Vertical
1. Cold water will _______.
4. Heat transfer by movement of liquids or gases.
2. An example of a conductor.
5. An example of an insulator.
3. Heat transfer by direct contact.
6. Hot water will _______.
Very good! Your answers are all correct!
16
What’s New
Activity 2: Complete Me!
Directions:
Study the picture and describe it by completing the statement
below. Write your answer in your Science activity notebook.
Figure 9. The Sun Heating the Earth
Heat from the _________ travels millions of kilometers through the
empty _________ before it reaches the _________.
What is It
In the previous lessons you have learned that conduction of heat can
occur in solid, liquid and gas while convection occurs only in liquids and gases.
In activity 1, heat moves through empty space (outer space) from the
sun to the earth. There is no medium like water, air, nor any solid material where
heat can travel through. This method of heat transfer is called radiation.
Radiation is the transfer of heat by means of electromagnetic waves. Radiate
means to emit, to send out, to release or spread outward from an origin or
17
source. So the sun, which is the source of heat radiates towards the earth in
the form of electromagnetic waves.
Radiation can occur through materials or through an empty space or
vacuum. Figure 10 shows the fire radiates heat and transfers it to the hand.
Figure 10. Hands Placed Near the Fire
All objects emit (release) and absorb (take in) heat. Hotter objects emit
more heat than colder objects. The sun is so hot that it can send a very great
amount of heat towards the earth. Not all objects absorb heat at the same
amount. Some absorb more heat than others. Dark colored objects, especially
black, absorb more heat than light or white colored objects. This is the reason
why, you will feel hotter and uncomfortable when you wear black shirts during
hot summer days. It is better to wear white or any light colored shirts.
18
What’s More
Activity 3: Melt Me Quick!
Reminders: Ask assistance from your parents or any responsible member of
the family in performing this activity.
Be careful in using the scissors!
Materials:
Black crayon
White crayon
Black art paper
White bond paper
Scissors
Procedure:
1. Cut a piece of white crayon and black crayon, about one centimeter
each. Be sure that the crayons are of the same brand and size.
2. Place the white crayon in a white bond paper and the black crayon in a
black art paper.
3. Place both crayons under the direct heat of the sun for two hours (refer
to figure 11 below).
4. Observe what will happen to the crayons.
5. Draw your observation indicating which crayon melted the most.
6. Copy the answer sheet format (figure 12) in your Science activity
notebook.
Activity 2: Melt Me Quick!
___ crayon melted faster than ___
crayon
Sketch of my observation :
White crayon
Figure 11. White and Black
Pieces of Crayons
Black crayon
Figure 12. Answer Sheet Format
You are really amazing! Your observation is perfect!
You can be a real scientist someday!
19
What I Have Learned
Directions:
Fill in the blanks with the missing word. Choose your answers
from the given words in the box. Write your answers in your
Science activity notebook.
hot
cold
energy
convection
sink
radiation
rise
waves
conduction
contact
Heat is a form of (1) ________ that always transfers from one object or
place to another. Transfer of heat will take place when there is a difference in
temperature between two objects. Naturally, heat flows from (2) ________ to
(3) ________ object. Heat transfer will stop once the two objects reach the
same temperature.
There are three methods of heat transfer. Heat transfer is easiest in solid
objects when they are in direct (4) ________ with each other. This method of
heat transfer is known as (5) ________.
When liquids and gases are heated, they become less dense. Less
dense materials will (6) ________. When these materials are cooled down, they
become denser. Denser materials will (7) ________. The rising and sinking of
hot and cold fluids is a method of heat transfer known as (8) ________.
Heat can also be transferred even without the presence of solid and fluid
materials. Heat can be transferred in empty space in the form of
electromagnetic (9) ________. This method of heat transfer is known as
(10) ________.
20
What I Can Do
Directions: Identify examples of situations or activities that can be observed
in your own house and surroundings involving the methods of
heat transfer. Draw and explain briefly why it is important to you
and your family. Copy the format given below in your Science
activity notebook.
Situation/Activity
Method of Heat
Transfer involved
It is important to us
because…..
Radiation
we can wear dry and
clean clothes.
Example :
1.
Conduction
2.
Convection
3.
Radiation
4.
Conduction
5.
Convection
21
Assessment
Directions: Read the questions carefully and choose the letter of the correct
answer. Write your answers in your Science activity notebook.
1. Which of the following statements is true about heat transfer?
A. Heat transfers from a colder to hotter object.
B. Heat transfers only in vacuum or empty space.
C. Transfer of heat is only on objects that are in contact.
D. Transfer of heat occurs when objects have different temperatures.
2. You place a warm bottle of juice in ice water. How would you compare the
temperature of the juice to that of the water after one hour?
A. the same
C. much colder
B. much hotter
D. a little bit colder
3. The ice cubes melt as you hold them in your hand. What is the direction of
heat transfer in this situation?
A. ice cube  air
C. hand  air
B. hand  ice cube
D. ice cube  hand
4. What heat transfer happens when you accidentally burn your finger by
touching fire?
A. Conduction
B. Convection
C. Dispersion
D. Radiation
5. In which of the following can convection current occur?
A. Aluminum
B. Vacuum
C. Water
D. Wood
6. What type of heat transfer can occur in a vacuum or empty space?
A. Conduction
B. Convection
C. Evaporation
D. Radiation
7. Your house is burning and you notice that the smoke and flame rise, but
near the floor is colder and less smoky; that’s why you crawl and manage to
get out from your house safely. This observation is an example of what
method of heat transfer?
A. Conduction
B. Convection
C. Insulation
22
D. Radiation
8. Why are some cooking pots coated black? It is because black
surfaces_________.
A. reflect more heat
C. are more durable
B. are easier to clean
D. absorb more heat
For questions number 9 – 12, refer to the situation and illustration below:
Your mother is preparing chicken soup for your
dinner using a metal pan placed over a hot stove.
9. How does heat travel to the metal pan? Heat travels to the metal pan
by____________.
A. conduction
B. convection
C. dispersion
D. radiation
10. What method heats up the entire chicken soup?
A. Conduction
B. Convection
C. Evaporation
D. Radiation
11. In what direction does heat travel through the chicken soup inside the
pan?
A. From bottom to top
C. From top to bottom
B. Sideways to the right
D. Sideways to the left
12. Your mother stands near the burning stove and fells warm in her stomach.
How does heat from the stove travel sideways to her stomach? Heat
travels through __________.
A. conduction
B. convection
C. dispersion
D. radiation
13. Which of the following situations is an example of conduction?
A. The spoon used to stir hot coffee is heated.
B. Clothes hanged outside the house are dried.
C. The water of the lake over a hot spring is heated.
D. Warm foods in lower compartments of the freezer are cooled.
14. Which of the following is an example of convection?
A. Holding a hot water bottle
C. Boiling water for a hot bath
C. Stepping on a cold tile floor
D. Drying of wet rug in clothes line
15. The following are examples of heat transfer by radiation, EXCEPT:
A. Drying salted fish
C. Sun bathing
B. Ironing clothes
D. Roasting chicken
23
Additional Activities
Directions: The pictures below involve transfer of heat. Classify each picture
as example of heat transfer by CONDUCTION, CONVECTION or
RADIATION. Write Pot A, B or C in your Science activity
notebook for each numbered picture.
A
CONDUCTION
1. Sun shines on earth
B
CONVECTION
2. Ice melts in hand
C
RADIATION
3. Water boils in a pot
4. Holding a heated rod
5. Roasting chicken
6. Smoke rising
7. Drying hair using blower
8. Sitting beside bonfire
9. Walking in hot sand
Congratulations! You have completed Module 6.
Please proceed to Module 7 and learn more about electric charges.
24
Lesson 3
What’s In
1.
25
Lesson 2
What’s In
A. Hot object –
high
2.
Cold object –
low
3.
4.
B. hot cup to
the girl’s hand
C. hand to the
5.
ice cube
1. Hot
1. Bubbles
What’s New
What’s New
3. Yes
upward
2. No
moved
2. Mongo
4. B
2. kettle pot
and down
1. hot stove
moved up
What’s More
seeds
4. insulator
1. move down
3. conduction
What’s More
Know
What’s In
What I
Lesson 1
13. C
1. road-higher
feet-lower
road  feet
12. B
What’s More
11. D
to tap water
10. D
5. from hot water
9. A
temperature
8. C
4. different
7. B
3. Setup 2
6. D
2. Setup 2
5. A
1. Setup 1
4. D
What’s New
3. B
3. A
2. B
2. C
1. A
1. B
14. B
15. C
2. sun-higher
clothes-lower
sun  clothes
3. sun-higher
earth –lower
sun earth
2. up
3. hotter
4. fire-higher
chicken-lower
fire  chicken
5. blower – higher
hair – lower
blower  hair
Answer Key
Assessment
1. D
26
What I Have
Learned
2. A
10. radiation
12. D
9. waves
11. A
8. convection
10. B
7. sink
9. A
6. rise
8. D
5. conduction
7. B
4. contact
6. D
3. cold
5. C
2. hot
4. A
1. energy
3. B
13. A
Black crayon
melts faster
than white
crayon
can sell in the
What’s More
or salted fish-
earth.
3. drying squid
reaches the
coffee
before it
drink milk or
empty space
water- can
through the
2. boiling
kilometre
rice
millions of
can eat cooked
sun travels
1. cooking rice-
Heat from the
Situation:
What’s New
Possible
Lesson 4
What I Can Do
market
Activities
15. B
Additional
14. C
4. hot bath
during fevercan help
1. Pot C
reduce fever
2. Pot A
5. opening
3. Pot B
windows for air
4. Pot A
to enter the
5. Pot C
house- freshen
6. Pot B
the room
7. Pot B
8. Pot C
9. Pot A
Lesson 4
What’s In
References
Books
Alvie J. Asuncion, et.al. 2017. Science - Grade 7 Learner's Material. Pasig
City: FEP Printing Corporation
Raymond A. Serway, et.al. 1999. Physics. Texas: Holt, Rinehart and Winston.
David V. Frank et.al. 2002. Science Explorer: Physical Science. New Jersy:
Prentice Hall.
Paul W. Zitzenitz, Robert F. Neff, Mark Davids. 1995. Merill Physics:
Principles and Problems. New York: Mac Graw-Hill School Publishing
Company.
Electronic Resources
O'Block, Tina. 2018. lessons4littleones.com. June 15. Accessed July 1, 2020.
https://lessons4littleones.com/2018/06/15/sun-learning-activites-andbook-suggestions/.
blog.hawaii.edu/. Accessed June 22, 2020.
http://blog.hawaii.edu/hcri/files/2017/01/U2L2-Heat-Energy.pdf.
n.d. mstworkbooks.co.za. Accessed July 13, 2020.
http://www.mstworkbooks.co.za/natural-sciences/gr7/gr7-ec-03.html.
27
For inquiries or feedback, please write or call:
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Cagayan de Oro City, 9000
Telefax: (088) 880 7072
E-mail Address: region10@deped.gov.ph