7
Science
Quarter 1 – SLeM 2:
Elements and Compounds
Science – Grade 7
Supplementary Learning Materials
Quarter 1 – Module 2: Elements and Compounds
First Edition, 2020
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Published by : Batasan Hills National High School
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Principal: Dr. Proceso T. Lera -Principal IV
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Introductory Message
For the facilitator:
This module was collaboratively designed, developed and reviewed by educators both from
public and private institutions to assist you, the teacher or facilitator in helping the learners
meet the standards set by the K to 12 Curriculum while overcoming their personal, social, and
economic constraints in schooling.
This learning resource hopes to engage the learners into guided and independent learning
activities at their own pace and time. Furthermore, this also aims to help learners acquire the
needed 21st century skills while taking into consideration their needs and circumstances.
In addition to the material in the main text, you will also see this box in the body of the module:
As a facilitator you are expected to orient the learners on how to use this module. You also
need to keep track of the learners' 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.
For the learner:
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.
HOW TO USE THIS MODULE
Before starting the module, I want you to set aside other tasks that will disturb you
while enjoying the lessons. Read the simple instructions below to successfully enjoy the
objectives of this kit. Have fun!
1. Follow carefully all the contents and instructions indicated on every page of this
module.
2. Write in your notebook the concepts that you learned. Writing enhances learning and
helps you keep in mind what is important
3. Perform all the provided activities in the module.
4. Let your facilitator/ guardian assess your answers using the answer key.
5. Enjoy studying.
PARTS OF THIS MODULE
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Expectations- These are what you will learn after completing the lessons in the
module.
Pre-test – This will measure what you already know about the concepts to be
mastered throughout the lesson.
Looking Back to your Lesson- This section will measure what learning’s and skills
you gained from the previous lesson.
Brief Introduction- This section will give you an overview of the lesson.
Activities- This is a set of activities you will perform.
Remember- This section summarizes the concepts and applications of the lessons.
Check your Understanding- It will check what you have learned from the lessons.
Post-test- This will measure how much you have learned from the entire module.
This module was designed and written with you in mind. It is here to help you master
the classification of substances such as elements and compounds. 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.
The module is divided into two lessons, namely:
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Lesson 1 – Elements: History and Origin
Lesson 2 – Compounds: Formation and decomposition
Lesson 1: Elements: History and Origin
Expectations
Specifically, this module will help you to:
1. define element; and
2. discuss the history of the origin of names and symbols of elements.
Let us start your journey in learning more about elements. I am sure you are ready and excited
to answer the Pre-test. Smile and cheer up!
Pre-Test
A. Choose the letter of the best answer.
1. What is the basic unit of matter?
A. atom
B. compound
C. mixture
D. molecule
2. Erbium an element with a symbol of Er, derived its name and symbol from what origin?
A. places
B. name of scientist
C. heavenly bodies D. ancient name
3. Which of the following elements does not belong to the group?
A. Helium (He)
B. Iron (Fe)
C. Sodium (Na)
D. Tin (Sn)
4. Which pair of name and symbol of elements is paired correctly?
A. Copper-Co
B. Cobalt-Co
C. Carbon-Ca
D. Chromium- Ch
5. Symbols of elements are derived from; their ancient names, first letter, first letter and other
letter from the name, heavenly bodies, names of scientist, and places. The symbol for
tungsten is W, Potassium is K and mercury is Hg. Where are these symbols derived
from?
A. Ancient names B. Heavenly bodies
C. Name of Scientist D. Places
Looking Back
As mentioned in your Grade 6 Chemistry lesson, matter is categorized as mixture and
pure substances. Water and gold are both pure substances, but why is water made up of
molecule and gold is made up of an atom?
Brief Introduction
An element is a substance that is made up of one kind of atom only. It cannot be
broken down into simpler substances. Below is a Periodic Table of elements designed by
Dmitri Mendeleev, a Russian Chemist.
Hydrogen is an element with a hydrogen atom. With a
symbol H
Every element is represented by a specific symbol. The most common symbol is
derived from the first letter or first two letters of the name. Symbols are written in a very
distinctive way, the first letter must always be a capital letter and the second letter is a small
letter. But some are derived from their ancient name, heavenly bodies, places on earth, and
name of scientists. The table below shows the name and symbol of some elements and the
origin of their name and symbols.
Elements derived
from ancient name
Name
Copper
(Cuprum)
Tin
(Stannum)
Iron
(Ferrum)
Gold
(Aurum)
Silver
(Argentum)
Elements derived
from heavenly
bodies
Symbol
Name
Symbol
Co
Neptunium
Np
(Neptune)
Sn
Palladium
Pd
(Pallasasteroid)
Fe
Cerium
Ce
(Ceresasteroid)
Au
Plutonium
Pu
(Pluto)
Ag
Uranium
(Uranus)
U
Elements derived
from places
Elements derived
from name of scientist
Name
Symbol
Name
Symbol
Californium
Ca
Seaborgium
Sg
(Glenn
Seaborg)
(California)
Berkelium
Bk
Bohrium
Bh
(Berkeley)
(Niels Bohr
Europium
(Europe)
Eu
Francium
(France)
Fr
Terbium
(Ytterby)
Tb
Einsteinium
(Albert
Einstein)
Fermium
(Enrico
Fermi)
Curium
(Marie
Curie)
Es
Fm
Cm
Activity
Activity 1. Origin of name and symbol of elements
Identify the origin of name and symbol of each of the following
elements.
Name of
elements
Sodium
Potassium
Mercury
Cobalt
Hydrogen
Helium
Aluminum
Roentgenium
Cerium
Ytterbium
Symbol
Na
K
Hg
Co
H
He
Al
Rg
Ce
Yt
Origin of name and symbol (write; heavenly body, ancient
name, place, name of scientist, first letter, first two letters)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Remember
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•
Element is the basic unit of matter it cannot be broken down into a simpler
substance.
Name and symbols of elements can be derived from its ancient name, from the
name of scientists, name of places, and name of heavenly bodies.
The symbol is written in a way such that the first letter is capital letter and the
second letter is a small letter.
Checking Your Understanding
Associate the letters of your name with the elements and their symbols.
Example
Galag: Ga-Gallium, Al-Aluminum, Ag-Silver
Post-Test
A. Choose the letter of the best answer.
1. What is the basic unit of matter?
A. atom
B. compound
C. mixture
D. molecule
2. Erbium an element with a symbol of Er derived its name and symbol from what origin?
A. places
B. name of scientist
C. heavenly bodies D. ancient name
3. Which of the following elements does not belong to the group?
A. Helium (He)
B. Iron (Fe)
C. Sodium (Na)
D. Tin (Sn)
4. Which pair of name and symbol of elements is paired correctly?
A. Copper-Co
B. Cobalt-Co
C. Carbon- Ca
D. Chromium-Ch
5. Symbols of elements are derived from; their ancient names, first letter, first letter and other
letter from the name, heavenly bodies, names of scientist, and places. The symbol for
tungsten is W, Potassium is K and mercury is Hg. Where do these symbols are derived
from?
A. Ancient names B. Heavenly bodies
C. Name of Scientist D. Places
- - - - - -End of lesson 1- - - - -
Lesson 2: Compounds: Formation and decomposition
Expectations
Specifically, this module will help you to:
1. define compounds;
2. describe how compounds are formed; and
3. illustrate how compound decomposes.
Let us start your journey in learning more about compounds. I am sure you are ready and
excited to answer the Pre-test. Smile and cheer up!
Pre-Test
Choose the letter of the best answer.
1. A compound is formed from combining atoms of elements. Which is not true about
compound?
A. Compound is a chemical combination of atoms of elements.
B. Compounds can only be separated by chemical means like electrolysis.
C. Compounds can be separated by physical means like evaporation or
distillation.
D. Compounds are combined with definite proportion, changing the proportion
changes the compound.
2. What kind of substance will be formed when different elements are chemically
combined?
A. Atom
B. Compound
C. Element
D. Mixture
3. Which of the following illustration below DOES NOT correctly illustrate a
compound?
A.
B.
C.
D.
4. What can be used to decompose a compound?
A. chemical process
B. evaporation process
C. distillation process
D. physical process
5. Which of the following compounds shows a combination of two atoms of the
same element?
A.
B.
C.
D.
Looking Back
In lesson 1 you learned about elements and in grade 6 Science you learned about
mixtures and substances.
Brief Introduction
A compound is a substance that is made from more than one atom combined
chemically. Since compound can only be combined chemically it can only be
separated through chemical process also. When atoms combine their individual chemical
property also changes.
O
H H
2 hydrogen atoms
Oxygen atom
When one oxygen atom chemically combines with two hydrogen atoms, they become a
compound called water.
O
H H
1 Water molecule
Na
Cl
One sodium atom
combined with
one chlorine atom
Na Cl
Sodium chloride compound (table salt)
A compound can only be chemically decomposed to its atomic composition.
Ca
Ca
O
O
C
O
Chemical decomposition
O
C
Activity
Activity 2. Mix and Match
Draw a line between the compound and its name.
Chlorine gas (Cl2)
Methane gas (CH4)
Water (H2O)
Hydrochloric acid (HCl)
Carbon dioxide (CO2)
Remember
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•
•
Compound is a chemical combination of two or more atoms.
Compounds cannot be separated by physical process.
When compound is formed the chemical properties of elements present in the
compound change.
Checking Your Understanding
Given the following elements, create a compound. The compounds that you will form must
not be found in this module. You can use the elements multiple times.
Carbon, Hydrogen, Oxygen, Calcium, Nitrogen, Fe, Sulfur, Iodine, Fluorine, and Boron
Post-Test
Choose the letter of the best answer.
1. A compound is formed from combining atoms of elements. Which is not true about
compound?
A. Compound is a chemical combination of atoms of elements.
B. Compounds can only be separated by chemical means like electrolysis.
C. Compounds can be separated by physical means like evaporation or
distillation.
D. Compounds are combined with definite proportion, changing the proportion
changes the compound.
2. What kind of substance will be formed when different elements are chemically
combined?
A. Atom
B. Compound
C. Element
D. Mixture
3. Which of the following illustrations below DOES NOT correctly illustrates a compound?
A.
B.
C.
D.
4. What can be used to decomposed a compound?
A. chemical process
B. evaporation process
C. distillation process
D. physical process
5. Which of the following compounds shows a combination of two atoms of the same
element?
A.
B.
C.
D.
- - - - - - -End of lesson 2- - - - - -
References
About Essential Elements, accessed July 24, 2020, https://www.livescience.com/3505chemistry-life-human-body.html
About Elements in the Periodic Table of Elements, accessed July 24, 2020,
http://www.chem.uiuc.edu/rogers/Text3/Tx33/tx33.html