7

Science
Quarter 1- Module 3
Two Worlds Apart:
Pure Substances vs Mixtures
Science - Grade 7
Alternative Delivery Mode
Quarter 1 – Module 3: Title: Two Worlds Apart: Pure Substances vs. Mixtures
First Edition, 2020

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Published by the Department of Education
Secretary: Leonor Magtolis Briones
Undersecretary: Diosdado M. San Antonio

Development Team of the Module

Writers: Wilfredo D. Bartolo, Jr., Glenn Frey L. Pepito, Leah Joy A. Desamparado
Editors: Cynthia S. Bustillo, Miraflor O. Albios
Reviewers: Agabai S. Kandalayang, Marry Anne A. Barrientos, Yusof A. Aliudin,
Mary Joy D. Bautista
Layout Artist: Glen D. Napoles, Analyn J. Madera, Ruth J. Gumangi
Management Team: Allan G. Farnazo
Isagani S. Dela Cruz
Gilbert B. Barrera
Arturo D. Tingson, Jr.
Peter Van C. Ang-ug
Elpidio B. Daquipil
Juvy B. Nitura
Lenie G. Forro

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Office Address: Regional Center, Brgy. Carpenter Hill, City of

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E-mail Address: region12@deped.gov.ph
 7

Science
Quarter 1 – Module 3:
Two Worlds Apart:
Pure Substances vs Mixtures
Introductory Message
For the facilitator:
Welcome to the Science 7 Alternative Delivery Mode (ADM) on Pure Substances and
Mixtures.

This SILM was collaboratively designed, developed and reviewed by educators from
public school institutions to assist you, the teacher or facilitator in helping the
learners meet the standards set by the Revised K to 12 Curriculum using the Most
Essential Learning Competency amidst the COVID – 19 pandemic.

This learning material hopes to engage the learners into self – instructional, guided
and independent learning activities at their own pace and convenient time.
Furthermore, this ADM Module also aims to help learners acquire and demonstrate
the lifelong skills of the 21 st century while taking into consideration their needs and
circumstances despite these trying times.

In addition to the module in the main text, this learning resource also contains helpful
tips or strategies that will help the teacher – facilitator in guiding the learners.

Note to the Teacher

Hello, dear teacher of learning! You are lucky that to have this learning material which let us
easily deliver the lesson for our learners, enhance their knowledge on Two Worlds Apart: Pure
Substances and Mixtures. Pls. help them achieve our learning objectives.

Please advise our learners to read, understand, analyze, and answer all the activities and
questions seriously as this material is designed and made for them. This is also to inform our
learners to take some precautionary measures and some activities need extra care.

This is just a reminder dear teacher of learning, do not go beyond our objectives and main goal
for our learners. Be an agent of learning. Have fun!

As a facilitator, you are expected to orient the learners on how to use this module.
You also need to keep track of the learner’s progress while allowing them to manage
their own learning. Furthermore, you are expected to encourage and assist the
learners as they do the tasks included in the module.

ii
 For the Learner:

Welcome to the Science 7 Alternative Delivery Mode (ADM) on Pure Substances and
Mixtures.
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:

This will give you an idea of the skills or competencies you are expected to learn in
the module. What I Need to Know
This part includes an activity that aims to check what you already know about the
lesson to take. If you
What get all the answers correct (100%), you may decide to skip this
I Know
module.
This is a brief drill or review to help you link the current lesson with the previous
one. What’s In

In this portion, the new lesson will be introduced to you in various ways such as a
story, a song,What’s
a poem,New
a problem opener, an activity or a situation.
This section provides a brief discussion of the lesson. This aims to help you discover
and understand newisconcepts
What It and skills.
This comprises activities for independent practice to solidify your understanding and
skills of the topic.
What’sYouMore
may check the answers to the exercises using the Answer Key
at the end of the module.
This includes questions or blank sentence/paragraph to be filled in to process what
you learned from
WhattheI Have
lesson.
Learned
This section provides an activity which will help you transfer your new knowledge or
skill into real What
life situations
I Can Door concerns.
This is a task which aims to evaluate your level of mastery in achieving the learning
competency. Assessment
In this portion, another activity will be given to you to enrich your knowledge or skill
of the lesson learned. ThisActivities
Additional also tends retention of learned concepts.
This contains answers to all activities in the module.
Answer Key
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 a separate sheet of paper in answering the exercises.
2. Do not 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 deep understanding of the relevant competencies. You can do it!
 What I Need to Know

Hello? How are you today? Are you ready for

another round of learning? In this module, before you will distinguish mixtures from
substances based on a set of properties, you will explore the pure substances first.
For example, look around you. Can you tell whether these matter found in your
environment or even at your home are pure substances such as the air you smell and
breathe, the food you eat, the water you drink and the other things you see, hear and
feel? It is for you to find out with the help of this module.
After going through this module, you are expected to:
1. Define pure substance;
2. Describe pure substance based on a set of properties; and
3. Relate the importance of pure substance in real – life situations

What I Know

Directions: Read each item carefully. Write only the letter of the correct answer for
each question. Use a separate sheet for your answers.
1. What are the two (2) classes of matter?
A. Atom and molecule
B. Element and compound
C. Plant and animal cells
D. Substance and mixture

2. Which is true regarding water?

A. Compound of element
B. Element of gases
C. Mixture of gases
D. Substances of gases

3. What is the difference between a substance and a mixture?

A. Substance can be separated while mixture cannot be separated.
B. Substance has many components while mixture has one only.
C. Substance is heterogeneous while mixture is homogeneous.
D. Substance is pure while mixture is impure.

4. To separate salt from water in a seawater mixture, what process is used?

A. Condensation
B. Distillation
C. Evaporation
D. Filtration

1
5. Which of the following is a property of mixture?
A. It has a definite composition.
B. It consists of a single phase.
C. It has a heterogeneous composition.
D. It can be chemically separated into its components.

6. Which of the following is a physical appearance of a substance?

A. Complicated
B. Homogeneous
C. Heterogeneous
D. Non-uniform

7. Which one is the best way to determine whether an unknown sample is a

substance or a mixture?
A. knowing its density.
B. tasting the given sample.
C. observing its physical appearance.
D. testing its melting and boiling point.

8. Which is NOT a technique to separate components of mixture?

A. Condensation
B. Distillation
C. Evaporation
D. Filtration

9. Which of the following is a heterogeneous mixture?

A. Air
B. Oil in water
C. Stainless steel
D. Soft drink

10.What is/are true for substance and mixture?

I. Pure substance melts completely.

II. Pure substance has a varying boiling point.
III. Mixture does not melt completely.
IV. Mixture has a fixed boiling point.

A. I and II only
B. I and III only
C. II and IV only
D. I and IV only
11.What does it indicate when a sugar is heated in a test tube until it is completely
changed into a black mass and droplets of water?
A. compound
B. Element
C. Mixture
D. Solution

12.What substance is made by mixing two elements without being chemically

combined?
A. compound
B. element
C. mixture
D. solution

13.What is the best way to use in separating iron parts from a mixture?
A. Filter paper
B. Magnet
C. Water
D. Spoon

14.Which of the following uses evaporation as a means of separating the components

of the given mixture?
A. Iron fillings and sand
B. Pebbles and water
C. Sand and gravel
D. Sugar and water

15.Which of the following statements distinguishes pure substances from mixtures?

A. Can be separated by physical means.
B. Consists of two or more kinds of matter.
C. Have no specific solubility and densities.
D. Have constant boiling temperature and melting temperature.
 Lesson

1 Pure Substance

What’s In

In your previous lesson, you learned that a solution is a homogeneous mixture.

It means that it has a uniform composition which makes the appearance uniform all
throughout.
This time you will describe the appearance and other properties of pure
substances. Is it homogeneous or heterogeneous? What are other properties of pure
substances?

What’s New
Activity No. 1
Let us proceed with the new lesson to be presented through a poem. You’ve got
what it takes to be a conqueror if you read carefully this poem and discover the
differences between substances and mixtures. The poem is entitled, “I am Substance, I
am Mixture.” (Note: This poem was composed exclusively for ADM module)

I am Substance, I am Mixture
By Wilfredo D. Bartolo, Jr.
Matter has two broad classes
Mixtures and substances
Each one with differences
Let us start with their appearances.
Homogeneous or heterogeneous
Telling a substance from a mixture can be used
When substances are all homogeneous
Mixtures can be homo or heterogeneous.
Next way to distinguish is through separating technique
Mixtures can be separated easy and quick
Through evaporation, distillation and filtration
But not substances due to chemical combination.
Substances and mixtures behave differently,
During boiling and melting most especially
Boiling point of substance is fixed while mixture is not
Substance melts completely but mixture does not
I am substance, I am mixture
Two worlds apart
Just always remember the differences they’ve got
To distinguish a substance or mixture from what is and what is not.
 What is It

How are you feeling so far? Did you find the poem interesting and effective
learning resource? If your answer is a big yes, let us find out!
To find out if the poem really helped you to discover and understand some of
the important concepts of the lesson; you will be asked to answer the following
questions below.
Guide Questions:
1. What is a pure substance?
2. What are the properties of pure substances?
3. Tabulate your answers about pure substances.

Set of
Pure Substances
Properties
Appearance
Melting point
Boiling point

NOTES TO REMEMBER: Pure Substances are one of the classes of matter.

Substances are homogeneous or with uniform composition and appearance are the
same all throughout. The temperature of a substance is fixed and sharp. During
melting, a substance melts completely/smoothly within a short time.
Activity No. 1.1
The figure below shows separating technique for the components of pure
substances. Another set of properties that distinguishes substances from mixtures.
 Electrolysis of Water

Guide

Questions:
A. What is the name of the pure substance H2O?

B. What are the components of water?

C. In the picture, can we separate Hydrogen (H) from Oxygen (O)?

D. What is the process that separates components H and O of water?

In pure substances, the components are chemically combined. The component

parts are difficult to separate except for water. During the process called electrolysis or
by-passing electric current the components Hydrogen (H) and Oxygen (O) of water are
separated.
Activity No. 1.2
Consider activity guides no. 1 and 2. Study first the given table and scenario.
Table 1: Boiling point of two liquid samples
Temperature in ˚C

SAMPLES Before After 5 After 8 After 10 After 12 After 14 After 16

heating minutes minutes minutes minutes minutes minutes

Liquid A 28 40 65 90 100 100 100

Liquid B 30 45 65 97 105 108 113

 Scenario 1: Melting point of two solid samples

Chef Matt and his assistant observed two solid samples: Solid A and Solid B.
Both substances are white crystalline powder. They cannot determine which is a
substance and mixture just by looking at it. So, to distinguish which is which, they
heated the two samples using an improvised melting dish. Both the two samples
were heated at the same time and received an equal amount of heat. After a few
minutes, they had observed that Solid A melts completely within a short period of
time; while Solid B has portions that seem to be not melting.
 What is It

To find out if you have understood the important concepts of the lesson, answer
the following questions below.

1. Which liquid sample is a substance?

Table 1: Boiling point of two liquid samples

Samples Temperature Observation while heating
Liquid A
Liquid B
2. Which solid sample is a substance?
Scenario 1: Melting point of two solid samples
Samples Appearance Observation while melting
Solid A
Solid B

During boiling, the temperature of a substance changes at the start then it

becomes the same and constant. During melting, a substance melts
completely/smoothly within a short time.

What’s More

Decide how to separate these pure substances? If it is not possible, please write
“cannot be separated” on the space provided.
Substance 1 Oxygen
Substance 2 Water
Substance 3 Gold
Substance 4 Carbon Dioxide
Substance 5 Carbon

Here is another Enrichment Activity for you. Read the paragraph below and
answer the questions that follow.
A
Joseph wants to compare the chemical properties of two substances. In
doing it, he prepared two flasks containing the substances and labeled them Liquid
A and Liquid B. He monitored the boiling points of the liquids and found that the
boiling points were 100˚C for substance A and 110˚C - 112˚C for liquid B. How
would you classify the two liquids?

Answer: Which liquid sample is a pure substance?

B
A student tests the melting point of a certain sample of potassium
alum/tawas. It starts melting at 91˚C and melts completely until the temperature is
92.5˚C. According to a data book, the melting point of potassium alum is 92.5˚C.
What can you say about the sample?

Answer: The sample is a .

 What I Have Learned

Directions: Read the paragraph and identify the correct words that fit in the
given sentences in the box below.

constant Boiling point melting liquid

completely different pure substance mixture
solid distilled water Melting point
heterogeneous homogeneous

Pure substances are (1) in appearance. During boiling, the

temperature of a (2) changes at the start then it becomes (3) . During
melting, a substance melts (4) within a short time.
To determine a (5) sample if it is a pure substance , you should test it
using its boiling point; while if it is a (6) sample, its melting point is the best
way to test. In Enrichment A, the liquid A is (7) since it has a fixed boiling point
while the water with salt is a mixture because it has a varying meltingpoint.

What I Can Do

Identify at least five (5) pure substances found in nature, in the supermarket,
grocery store and even at your home. Use the table below to explain your answer
based on appearance, separating techniques, boiling and melting point.
Pure Appearance Separating Boiling point Melting point
Substances (Homogeneous Techniques (Fixed (Melts
or (Components temperature or completely and
Heterogeneous) can be temperature smoothly or a
separated or different in portion does not
inseparable) different times) melt)
1.
2.
3.
4.
5.

Assessment
Directions: Read each item carefully. Write only the letter of
the correct answer for each question. Use a separate sheet for your
answers.

1. A gaseous material has a strong smell, evaporates quickly, particularly boils at -

33.34˚C and melts at -77.73˚C. This matter can be classified as .
 A. metal
B. mixture
C. solution
D. substance

2. Ella is experimenting on how two liquid samples. The data he gathered is shown in
the table below.
Temperature in ˚C
Before After 5 After 8 After 10 After 12 After 14 After 16
SAMPLES heating minutes minutes minutes minutes minutes minutes
Liquid A 29 45 60 90 100 100 100
Liquid B 30 47 65 97 100 105 108
What can be inferred from the table?
A. Liquid A is pure substance while Liquid B is a mixture.
B. Liquid A is a mixture while Liquid B is a pure substance.
C. Liquid A is an element while Liquid B is a substance.
D. Both Liquids A and B are pure substance.

3. A pinch of bread was placed inside a test tube and heated until it became blackish
in color and released some gas. Which of the following statement/s is/are true
according to the given information?

I. Bread is solution.
II. Bread is composed of only one substance.
III. Bread is made up of solid and gaseous substances.
IV. Bread is made up of mixtures of different substances.

A. I only
B. II & III
C. II only
D. III & IV
4. Water boils at 100˚C and pure ethanol at 78˚C. Which of the statements are TRUE
about water and ethanol?

I. Water and ethanol are pure substances.

II. Water and ethanol can be boiled at either 100˚C or 78˚C.
III. Water and ethanol have specific temperatures at which they would start to boil.
IV. Water and ethanol can be identified according to temperature at which they boil.
A. I only
B. I, II and IV
C. III only
D. I, III, and IV
5. Sodium chloride dissolves in water very well. Which is NOT TRUE in the
following statements?
A. Water is a pure substance.
B. Sodium chloride is a pure substance.
C. Dissolving sodium chloride with water produces a mixture.
 D. Dissolving sodium chloride with water produces a new substance.
6. Ana wants to compare the chemical properties of two substances. In doing it, he
prepared two flasks containing the substances and labeled them Liquid A and
Liquid B. He monitored the boiling points of the liquids and found that the
boilingpoints were 100˚C for substance A and 110˚C - 112˚C for liquid B. How
would you classify the two liquids?
A. Liquid A is pure substance while Liquid B is a mixture.
B. Liquids A and B contain two or more atoms that are chemically bonded.
C. Liquid A has varying boiling points while liquid B has a fix boiling point.
D. Liquid A maybe homogenous or heterogeneous but substance B is not.

7. A white powder was tested and heated. After some time, it melts completely. What
does it imply?
A. It is a mixture.
B. It is a pure substance.
C. It is a homogeneous mixture.
D. It is a combination of pure substance and mixture.

For items 8 and 9, two liquids were observed and heated. The data gathered is
shown in the table below.
Temperature (˚C) Liquid A Liquid B
At start of boiling 100 80
After 30 sec 100 85
After 60 sec 100 84
After 90 sec 100 86

8. Based on the table above, which of the following is TRUE about Liquid A?
A. It has a fixed boiling point.
B. It is heterogeneous.
C. It is a mixture.
D. It is an element.
9. Which of the following could be Liquid A?
A. Fruit juice
B. Soft drinks
C. water
D. water – salt solution
10. Ethan wants to separate the marbles in a jar full of water. Which of the following is
the best way to separate the mixture?
A. Decantation
B. Dissolving
C. Evaporation
D. Using a magnet

11. Which of the following will Jeofrey do to segregate the rubber bands of different
colors?
 A. Water Decantation
B. Evaporation
C. Filtration
D. Physical manipulation
12. What is the best way to use in separating iron fillings from a mixture?
A. Filter paper
B. Magnet
C. Water
D. Spoon

13. Which of the following uses evaporation as a means of separating the components
of the given mixture?
A. Oil and water
B. Pebbles and sand
C. Sand and gravel
D. Salt and water

14. Which of the following materials will be used to separate a mixture of iron nails
and sand?
A. Alcohol Lamp
B. Filter paper
C. Magnet
D. Spoon

15. Glen wants to separate salt and water mixture. Which of the following will help him
to successfully separate the components of the mixture?

Using a magnet Decantation

Dissolving Evaporation
A. I, II, III, IV
B. I, II only
C. III, IV only
D. I and IV only
 Additional Activities

Fill in the Venn Diagram below with similarities and differences between pure
substances and mixtures.

Homogeneous
Homogeneous/Heterogeneous
It has fixed boiling point
It has varying boiling point
It melts completely
Some portion seems to be not melting

Substance Mixture

What I Need to Know

 Hello? How are you today? Are you ready for another round of learning?
In this module, before you will distinguish mixtures from substances based on
a set of properties, you will also explore the mixtures.
For example, look around you. Can you tell whether if these matter found in
your environment or even at your home are mixtures such as the air you smell and
breathe, the food you eat, the water you drink and the other things you see, hear and
feel? It is for you to find out with the help of this module.
After going through this module, you are expected to:
1. Define mixtures
2. Describe mixtures based on a set of properties
3. Relate the importance of mixtures in real – life situations

What I Know

1. What are the two (2) classes of matter?

A. Atom and molecule
B. Plant and animal cells
C. Element and compound
D. Substance and mixture

2. Which is true regarding air?

A. Compound of gases
B. Element of gases
C. Mixture of gases
D. Substances of gases

3. What is the difference between a substance and a mixture?

A. Substance can be separated while mixture cannot be separated.
B. Substance has many components while mixture has one only.
C. Substance is heterogeneous while mixture is homogeneous.
D. Substance is pure while mixture is impure.

4. To separate salt from water in a seawater mixture, what process is used?

A. Condensation
B. Distillation
C. Evaporation
D. Filtration

5. Which of the following is a property of mixture?

A. It has a definite composition.
B. It consists of a single phase.
C. It has a heterogeneous composition.
D. It can be chemically separated into its components.

6. Which of the following is a physical appearance of a substance?

 A. Complicated
B. Homogeneous
C. Heterogeneous
D. Non-uniform

7. Which one is the best way to determine whether an unknown sample is a

substance or a mixture?
A. knowing its density.
B. tasting the given sample
C. observing its physical appearance.
D. testing its melting and boiling point.

8. All are techniques which help to separate components of mixtures. Which of these
is NOT?
A. Condensation
B. Distillation
C. Evaporation
D. Filtration
9. Which of the following is a heterogeneous mixture?
A. Air
B. Soft drink
C. Oil in water
D. Stainless steel

10.What is/are true for substance and mixture?

I. Pure substance melts completely.
II. Pure substance has a varying boiling point.
III. Mixture does not melt completely.
IV. Mixture has a fixed boiling point.

A. I and II only
B. I and III only
C. II and IV only
D. I and IV only

11.What does it indicate when a sugar is heated in a test tube until it is completely
changed into a black mass and droplets of water? The sugar is a/an
A. Compound
B. Element
C. Mixture
D. Solution

12.What substance is made by mixing two elements without being chemically

combined?
A. Compound
B. Element
C. Mixture
D. Solution
13.What is the best way to use in separating iron parts from a mixture?
A. Filter paper
B. Magnet
C. Water
D. Spoon

14.Which of the following uses evaporation as a means of separating the components

of the given mixture?
A. Iron fillings and sand
B. Pebbles and water
C. Sand and gravel
D. Sugar and water
15.Which of the following statements distinguishes pure substances from mixtures?
A. Can be separated by physical means.
B. Consists of two or more kinds of matter.
C. Have no specific solubility and densities.
D. Have constant boiling temperature and melting temperature.

Lesson
Properties of Pure
2 Substance

What’s In

In your previous lesson, you learned solution which is a homogeneous mixture.

Homogeneous means uniform in composition which makes the appearance uniform all
throughout.
This time you will describe the appearance and other properties of mixtures. Is
it homogeneous or heterogeneous? What are other properties of pure substances?

What’s New

Activity No. 1
Let us proceed with the new lesson to be presented though a poem. You’ve got
what it takes to be a conqueror if you read carefully this poem and discover the
differences between substances and mixtures. The poem is entitled, “I am substance, I
am mixture.” (Note: This poem was composed exclusively for SILM)

I AM SUBSTANCE, I AM MIXTURE
 By Wilfredo D. Bartolo, Jr
Matter has two broad classes
Mixtures and substances
Each one with differences
Let us start with their appearances.
Homogeneous or heterogeneous
Telling a substance from a mixture can be used
When substances are all homogeneous
Mixtures can be homo or heterogeneous.
Next way to distinguish is through separating technique
Mixtures can be separated easy and quick
Through evaporation, distillation and filtration
But not substances due to chemical combination.
Substances and mixtures behave differently,
During boiling and melting most especially
Boiling point of substance is fixed while mixture is not
Substance melts completely but mixture does not
I am substance, I am mixture
Two worlds apart

What is It
Activity 1.1
Find out if the poem really helped you to discover and understand some of the
important concepts of the lesson. Answer the following questions below.
Guide HOTS Questions:
1. What is a mixture?
2. What are the sets of properties of mixtures?
3. Tabulate your answer about the properties of matter.

Set of Properties Mixtures

Appearance

Melting point

Boiling point
 Substances and mixtures are classes of matter. Mixtures are heterogeneous or without
uniform composition and appearance are not the same all throughout. The temperature
of a mixture is different at different times. During melting, a mixture has portions that
seem to be not melting.

Activity No. 1.2

Figures below show separating techniques for the components of mixtures. Another set
of properties that distinguishes substances from mixtures.

Figure A Figure B Figure C

Figure D Figure E Figure F

What is It
Find out if you have discovered and understood the important concepts of the lesson,
you will be asked to answer the following questions below.
A. Which pictures show filtration or straining?

B. Which picture shows filter paper being used?

C. Which picture shows pieces of iron being separated?

D. Which picture shows decantation?

E. Which picture shows dissolving?

F. Which picture shows evaporation?

There are a lot of ways to separate mixtures. Physical manipulation separates

using a spoon or any scooping material or by picking. The use of magnet can be done
to separate the metallic materials from nonmetallic materials. Filtration is the
separation of an insoluble solid from a liquid mixture using filter paper. In
decantation, the large particles of insoluble solid are separated from the liquid
mixture. Evaporation separates the soluble solid from the liquid component of the
solution by evaporating the liquid substance.

Activity No. 1.3

Consider activity guides no. 1 and 2. If you are ready, start! Study fist table 1
and scenario 1.

Table 1: Boiling point of two liquid samples

Temperature in ˚C
Before After 5 After 8 After 10 After 12 After 14 After 16
SAMPLES heating minutes minutes minutes minutes minutes minutes
Liquid A 28 40 65 90 100 100 100
Liquid B 30 45 65 97 105 108 113

Scenario 1: Melting point of two solid samples

Chef Matt and his assistant observed two solid samples: Solid A and Solid B.
Both substances are white crystalline powder. They cannot determine which is a
substance and mixture just by looking at it. So, to distinguish which is which, they
heated the two samples using an improvised melting dish. Both the two samples
were heated at the same time and received an equal amount of heat. After a few
minutes, they had observed that Solid A melts completely within a short period of
time; while Solid B has portions that seem to be not melting.

What is It
Find out if you have discovered and understood the important
concepts of the lesson, you will be asked to answer the following
questions below.

1. Which liquid sample is a substance?

Table 1: Boiling point of two liquid samples

Samples Temperature Observation while heating

Liquid A
Liquid B

2. Which solid sample is a substance?

Scenario 1: Melting point of two solid samples

Samples Appearance Observation while melting

Solid A
Solid B

During boiling, the temperature of a mixture is different at different times. During

melting, a mixture has portions that seem to be not melting.
 What’s More

Decide how to separate these pure substances? If it is not possible, please write
“cannot be separated” on the space provided.
Mixture 1 salt and iron filings
Mixture 2 water and pebbles
Mixture 3 salty water
Mixture 4 salt, iron filings and water
Mixture 5 gravel, sand and sugar
Mixture 6 gravel, sand, sugar and iron filings

Figure A A magnet is used to separate iron Figure B Water is used to dissolve a solid

Figure C A strainer is used to separate large Figure D Decanting water with insoluble
solids materials into the other container

is used to separate Figure F Filtration is used to separate very

small solids.

Figure E Evaporation
already dissolve solids.
Read the paragraph below and answer the questions that follow.
 A
Joseph wants to compare the chemical properties of two substances. In
doing it, he prepared two flasks containing the substances and labeled them
Liquid A and Liquid B. He monitored the boiling points of the liquids and found
that the boiling points were 100˚C for substance A and 110˚C - 112˚C for liquid
B. How would you classify the two liquids?

Answer: Liquid A is .
B
Liquid B is .

B
A student tests the melting point of a certain sample of potassium
alum/tawas. It starts melting at 87-89˚C but does not melt completely until the
temperature is 91˚C. According to a data book, the melting point of potassium
alum is 92.5˚C. What can you say about the sample?

Answer: The sample is a .

Teacher Joy placed two white solid substances in two different beakers.
She labeled the beakers as Solid A and Solid B. She said that Solid A is a
substance and Solid B is a mixture. If you are going to test the melting point of
the two samples what would you expect to the melting point of Solid A and Solid
B?
Answer: .

What I Have Learned

Read the paragraph carefully and fill in the correct words that fit in the given
sentences found in the box below.

magnet mixtures filtration different

manipulation evaporation liquid

(1) are separated without any chemical reactions. There are many
different kinds of mixtures. Different mixtures are separated in (2) ways.
Physical (3) separates the components of varying sizes using a
spoon or any scooping material or by picking. The use of (4) can be done
to separate the metallic materials from nonmetallic materials. (5) is the
separation of an insoluble solid from a liquid mixture using a semipermeable
membrane like filter paper.
In decantation, the large particles of insoluble solid are separated from the
(6) mixture. (7) separates the soluble solid from the liquid
component of the solution by evaporating the liquid substance.
 What I Can Do

Identify at least five (5) examples of mixtures found in nature, in the

supermarket, grocery store and even at your home. Distinguish these matters as
either substances or mixtures. Use the table below to explain your answer based on
appearance, separating techniques, boiling and melting point.

Mixtures Appearance Separating Boiling point Melting point

(Homogeneous Techniques(Comp (Fixed (Melts
or onents can be temperature or completely and
Heterogeneous) separated or temperature smoothly or a
inseparable) different in portion does
different times not melt)

1.
2.
3.
4.
5.

Assessment

1. A gaseous material has a strong smell, evaporates quickly, particularly boils at -

33.34˚C and melts at -77.73˚C. This matter can be classified as .
A. metal
B. mixture
C. solution
D. substance

2. Ella is experimenting on how two liquid samples. The data he gathered is shown in
the table below.
Temperature in ˚C
Before After 5 After 8 After 10 After 12 After 14 After 16
SAMPLES heating minutes minutes minutes minutes minutes minutes
Liquid A 29 45 60 90 100 100 100
Liquid B 30 47 65 97 100 105 108

What can be inferred from the table?

A. Liquid A is pure substance while Liquid B is a mixture.
B. Liquid A is a mixture while Liquid B is a pure substance.
C. Liquid A is an element while Liquid B is a substance.
D. Both Liquids A and B are pure substance.
 3. A pinch of bread was placed inside a test tube and heated until it became blackish
in color and released some gas. Which of the following statement/s is/are TRUE
according to the given information?
I. Bread is solution.
II. Bread is composed of only one substance.
III. Bread is made up of solid and gaseous substances.
IV. Bread is made up of mixtures of different substances.
A. I only
B. II & III
C. II only
D. III & IV

4. Water boils at 100˚C and pure ethanol at 78˚C. Which of the statements are TRUE
about water and ethanol?

I. Water and ethanol are pure substances.

II. Water and ethanol can be boiled at either 100˚C or 78˚C.
III. Water and ethanol have specific temperatures at which they
would start to boil.
IV. Water and ethanol can be identified according to temperature at
which they boil.

A. I only
B. I, II and IV
C. III only
D. I, III, and IV

5. Sodium chloride dissolves in water very well. Which is NOT TRUE in the following
statements?
A. Water is a pure substance.
B. Sodium chloride is a pure substance.
C. Dissolving sodium chloride with water produces a mixture.
D. Dissolving sodium chloride with water produces a new substance.

6. Ana wants to compare the chemical properties of two substances. In doing it, he
prepared two flasks containing the substances and labeled them Liquid A and
Liquid
B. He monitored the boiling points of the liquids and found that the boiling points
were 100˚C for substance A and 110˚C - 112˚C for liquid B. How would you classify
the two liquids?
A. Liquid A is pure substance while Liquid B is a mixture.
B. Liquids A and B contain two or more atoms that are chemically bonded.
C. Liquid A has varying boiling points while liquid B has a fix boiling point.
D. Liquid A may be homogenous or heterogeneous but substance B is not.

7. A white powder was tested and heated. After some time, it melts completely. What
does it imply?
A. It is a mixture.
B. It is a pure substance.
C. It is a homogeneous mixture.
D. It is a combination of pure substance and mixture.
Two liquids were observed and heated. The data gathered is shown in the table below.
Temperature (˚C) Liquid A Liquid B
At start of boiling 100 80
After 30 sec 100 85
After 60 sec 100 84
After 90 sec 100 86
8. Based on the table above, which of the following is TRUE about Liquid A?
A. It has a fixed boiling point.
B. It is heterogeneous.
C. It is a mixture.
D. It is an element.

9. Which of the following could be Liquid A?

A. Fruit juice
B. Soft drinks
C. Water
D. water – salt solution

10.Ethan wants to separate the marbles in a jar full of water. Which of the following is
the BEST way to separate the mixture?
A. Decantation
B. Dissolving
C. Evaporation
D. Using a magnet

11.Which of the following will Jeofrey do to segregate the rubber bands of different
colors?
A. Decantation
B. Evaporation
C. Filtration
D. Physical manipulation

12.What is the BEST way to use in separating iron fillings from a mixture?
A. Filter paper
B. Magnet
C. Water
D. Spoon

13.Which of the following uses evaporation as a means of separating the components

of the given mixture?
A. Oil and water
B. Pebbles and sand
C. Sand and gravel
D. Salt and water

14.Which of the following materials will be used to separate a mixture of iron nails
and sand?
A. Alcohol Lamp
B. Filter paper
C. Magnet
D. Spoon
15.Glenn wants to separate salt and water mixture. Which of the following will help
him to successfully separate the components of the mixture?
Using a magnet Decantation
Dissolving Evaporation

A. I, II, III, IV
B. I, II
C. III, IV
D. IV only

Additional Activities

Ending with Crosswords

Across:
2. It separates the components of varying sizes using a spoon or any
scooping material or by picking.
6. This is used when separating the iron nails from a jar full of sand.
Down:
1. It is the separation of an insoluble solid from a liquid mixture using a
semi-permeable membrane like filter paper.
3. The large particles of insoluble solid are separated from the
liquid mixture.
4. The liquid component is separated from the solid component by
heating the mixture leaving the solid component.
5. This is the best way to separate sugar and sand mixture.
 Answer Key

Lesson 1 Lesson 2
References
Books

Asuncion, Alvie J., et al. 2017. K to 12 Science Grade 7 Learners Material. First Edition.
Pasig City: Bureau of Learning Resources (DepEd-BLR).

2020. Department of Education Curriculum Strand. Pasig City: Department of Education.

K to 12 Science Curriculum Guide. Pasig City: Department of Education.

Mapa, Amelia P.,et al. 2001. EASE I.Module 5.Lesson 3. Quezon City: Book Media Press.

Seymour, Rosen. 2000. Science Worshop Series. New Jersey 07458: Globe Fearon Inc.

Tan, Merle C., et al. 2009. EASE III.Module 3. Lesson 2. BEAM III Unit 2. Mandaluyong:
Printwell, Inc.

Treyes, Rodolfo S. et al. 1997. Science and Technology III: NISMED. Second Edition.
Pasig City: Department of Education.

Websites

2020. January 29. http://www.minichemistry.com/.

2016. Learning Resources and Management System. May. http://lrmds.deped.gov.ph/.

For inquiries or feedback, please write or call:

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Meralco Avenue, Pasig City, Philippines 1600

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