Republic of the Philippines

Department of Education

Supplementary Learning Materials (SLMs)

SCIENCE, TECHNOLOGY,
ENGINEERING AND MATHEMATICS (STEM)

General Chemistry 1
First Semester, Quarter I

MODULE 1
Content Standard:

The learner demonstrates understanding of the properties of matter and its various
forms, the structure of an atom and the formula and the name of compound and
the relationship of percent composition and chemical formula.

Performance Standard:

The learners shall be able to design using multimedia, demonstrations, or model,

a representation or simulation of any of the following:
a. atomic structure b. mass relationships in reactions

Most Essential Learning Competencies:

 Use properties of matter to identify substances and to separate them.

(STEM_GC11MPIa-b-5)
 Recognize the formulas of common chemical substances.
(STEM_GC11MPIa-b-9)
 Compare consumer products on the basis of their components for use, safety,
quality and cost. (STEM_GC11MPIa-b-11)
 Describe various simple separation techniques such as distillation,
chromatography. (STEM_GC11MPIa-b-12)
 Recognize common isotopes and their uses. (STEM_GC11AMIc-e-19)
 Represent compounds using chemical formulas, structural formulas and
models. (STEM_GC11AMIc-e-21)
 Name compounds given their formula and write formula given the name of
the compound. (STEM_GC11AMIc-e-23)
 Calculate the empirical formula from the percent composition of a compound.
(STEM_GC11PCIf-32)
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LESSON 1
PROPERTIES OF MATTER, COMMON CHEMICAL
COMPOUNDS, CONSUMER PRODUCTS & SEPARATION
TECHNIQUES
Learning Targets
 Analyze the differences between the properties of matter.
 Recognize chemical compounds commonly used at home and laboratory.
 List the formulas of common chemical substances based on their category.
 Infer the importance of consumer products based on its description.
 Describe how separation techniques between compounds happen.
 Illustrate how filtration occurs.
 Appreciate the importance of separating mixtures in existing real-life problems.

Introduction
Chemistry is a branch of science known to continuously evolve due to the new
discoveries of theories and concepts that are vital in our world, both in nature and
other real-life applications. It focusses on matter and the changes it undergoes.
Advances in technological and intellectual aspects enabled scientist and researches
to analyse substances even to its smallest components explaining their physical and
chemical characteristics.
Properties of matter are grouped into two major classifications (physical property
and chemical property of matter). Furthermore, the physical properties of matter can
be classified into intensive physical property and extensive physical property.
The different states of matter, the arrangement and the energy of the particles
are important in solids, liquids and gases. Separating these molecules could be in
the form of physical separation, solubility separation and melting point separation.

Gear Up!
Directions: Respond to each statement twice: first before the lesson and again
after the lesson. Put a check mark if you agree with the statement and X if
otherwise.
Before After
the Statements the
Lesson Lesson
1. A substance is a form of matter that has a definite composition and
distinct properties which can either be an element or a compound. Its
properties can be categorized based on change or dependence on amount
of matter.
2. Chemical property involves the burning of hydrogen in air to form water
compounds whereas distillation is involved in removing the concentration
of particulate matter in liquids.
3. Butane or n-butane (C4H10) is highly flammable and easily liquefied gas
that quickly vaporize at room temperature. It is a component of LPG gas
which price increases due to manufacturing costs, supply-demand, and
competition.
4. Some of the common laboratory chemicals categorized as acids are
H2SO4, C6H12O6 and HCl.

5. The use of activated carbon is an example of chemical filtration

that purifies and provides a large surface area to which contaminants may
adsorb without harming other organisms and keeping the water clean.

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ANALYZE AND EXPLORE

Chemists distinguish among several subcategories of matter based on
composition and properties. The classifications of matter include substances,
mixtures, elements, and compounds, as well as atoms and molecules.

I. PROPERTIES OF MATTER

PHYSICAL CHEMICAL INTENSIVE EXTENSIVE

Distinguishing one substance from another based on its characteristic is called

properties. Physical property characterizes matter that is not associated with a change in
property such as density, color, temperature change in which the matter retains its physical
state. Matter undergoes physical change when its state or properties of matter changes
without any accompanying change in its chemical composition. On the other hand, chemical
property is the change of one type of matter into another type without the ability to return to its
original composition. Identifying this means looking at its chemical change – production of one
or more types of matter that differ from the matter present before the change.

Examples:
Physical property showing Chemical property
physical change. showing chemical
– Melting of ice to liquid change
water. - Water is when
hydrogen burns in air

Properties of matter based on amount of matter are categorized as extensive or intensive

property. An extensive property depends on the amount of matter present on it for instance,
mass and volume of objects. Conversely, intensive property does not depend on the amount
of matter. If the 1L and 2L of tea each at 25°C (room temperature) are combined, the
temperature remains at 25°C.

Example:
Alex accidentally had spattered drops of hot oil in her arm and a severe burn in her leg
from a pot of hot oil. Both causes discomfort but the pot of hot oil gives more discomfort than
the drops. The oils (drops and pot) coming from the same container have the same temperature
(intensive property), but the pot of oil contains much more heat (extensive property).

II. COMMON CHEMICAL COMPOUNDS

An element is a substance that cannot be separated into simpler substances by chemical

means while a compound is a substance composed of atoms of two or more elements
chemically. Compounds can be separated only by chemical means into their pure components.

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Here are some chemical compounds – Name and Formula:

Common Chemical Compound Compound
Chemical Name Formula Formula
Name Formula ion ion
sodium
Baking soda hydrogen
carbonate or NaHCO3 chlorate ClO−3 carbonate CO32−
sodium
bicarbonate
Bleaching calcium Ca(ClO)2 permanganate MnO4− phosphate PO4-3
powder hypochlorite

Chloroform trichloromethane CHCl3 acetate C3H2O2− lithium Li+

hydrochloric
Sugar sucrose C6H12O6 water H2O HCl
acid
Toothpaste sodium fluoride NaF sulfuric acid H2SO4 ethane C2H6
Lye/Caustic sodium
NaOH nickel Ni2+ copper (II) Cu2+
Soda hydroxide
Salt sodium chloride NaCl oxide O2− methane CH4
−
Butane butane/n-butane C4H10 fluoride F ammonia NH3
Ethyl Alcohol ethanol C2H5OH sodium Na+ zinc Zn2+
Remember:
The following are some guidelines for naming compounds:
1. The compound name will always include the names of the elements that are part of it.
2. In a compound, the element that is on the left of the Periodic Table is used first when
naming the compound.
3. The symbols of the elements can be used to represent compounds e.g. FeS, NaCl,
KBr and H2O.
4. A compound may contain ions (an ion is an atom that has lost or gained electrons).

5. These ions can either be simple (consist of only one element) or compound (consist of
several elements).
Source:
Classification of matter. 2015. Siyavula Technology-powered learning. Siyavula Education.
(Accessed 06/2020).

III. CONSUMER PRODUCTS

Consumer goods are products bought for consumption by the average consumer.
Alternatively called final goods, consumer goods are the end result of production. Clothing,
food, and jewelry, etc., are examples of consumer products.
There

Focused Questions/Concepts:

1. How do you define consumer products?

2. What are consumer products are its examples?
3. How do you assess consumer products?

Discussion:

1. Consumer product is the final good that is bought by individuals or households for personal
use. In other words, consumer products are goods that are bought for consumption by the
average consumer.

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2. Consumer products were made possible because of the interactions

of Science, Technology and Society. The Knowledge (Science) is being
used to come up with the different consumer products (Technology) that
address problems of the community (Society). For example, Bath soap
(Technology) is a consumer product which we usually use to solve a
problem of the Society that is skin infection and poor hygiene.
There are many consumer products available in the market because
of their usefulness. However, the same consumer products may post
danger to anyone. Now, when is a consumer product may cause danger if it is very useful to
us? A consumer product may cause harm to us due to abuse or misuse of product and made
intended to cause harm such as gun powder and poisons.

Types of Consumer Products:

3. Analyze the table below that shows information of bath soap in terms of its some chemical
components, use, safeness, and cost.

Based from the table, some of the chemical components used to make bath soap are glycerine,
sodium hydroxide and titanium dioxide. Glycerine is added to soap as emollient and texture
enhancer while sodium hydroxide is added to bath soap to as main ingredient. Titanium dioxide
is added to make the bath soap opaque while Triclosan is added as the active anti-bacterial
ingredient.

IV. METHODS OF SEPARATING SUBSTANCES OR MIXTURES

The method of separating components of mixtures is a procedure or process of segregating

or moving the constituent or part of a substance which is made up of two or more pure
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substances. First is method which is describe as procedure, process, way or technique. Second
is the separate which means to move, segregate or keep apart. Third is component which
means constituent, section or a part of a larger whole. And lastly is the word mixture which
means a substance produced when two or more pure substances are put together in any
proportion without a chemical union.
Sample of a mixture is sea water because sea water contains both water and salt which
are mixed together in different proportion or amount. Another example is mixture of water
conglomerate which is a mixture of sand, gravel and cement which is used as construction
materials. In separating mixtures, you are considering its properties, purity, and the solutions.
There are different types of separation techniques used in different applications.

The table below gives some methods on Separation Techniques.

Source:
OnlineMathLearning.com
.2020. States of Matter
and Separation
Techniques -
https://www.onlinemathle
arning.com/nature-of-
matter.html.
Accessed on 06/2020.

Proceed to the Activity Sheet on page 13.

Answer Activity 1 and 2. After answering, return to this page.

REFLECT
One-sentence completion: Complete the given sentence below.
It is important to learn the concepts in the lesson because ___________________.

Congratulations!
Proceed to the next lesson.
THANK YOU! 

LESSON 2
ISOTOPES, FORMULAS AND MODELS
Learning Targets
 Determine common isotopes and their uses.
 Represent compounds using chemical formulas, structural formulas and
models.
 Name compounds given their formula and write formula given the name of
the compound.
 Develop keenness on analyzing the importance of compounds and its uses.
Introduction
Democritus a Greek philosopher during the fifth century BC, denotes atom as
atomos known for being uncuttable or indivisible. Experimental evidences provide

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data that gave rise to modern definitions of elements and compounds. Compounds can be
represented using their chemical formulas, structural formulas and its models. It’s not just the
compounds that can be represented using different structures but also elements existing as
molecules. Those elements that exist as molecules made up of two or more atoms of the
element chemically bonded together can also be represented by models, molecular formulas
and structural formulas just like compounds.
On the other hand, another finding involved the discovery of isotopes. A lot of new
kinds of elements are being discovered by scientist. Analysis identified that they are
somewhat identical to its parent element. The discovery of isotope led Frederick Soddy to his
Nobel Prize in Chemistry on 1921. Radioactive and stable isotopes have many useful
applications in different fields of study.
Gear Up!
Directions: Analyze each given statements. Write I Already Knew That if your
understanding in the given concept is enough to master the topic and you can
easily discuss examples about it. If not, write Need More Info if you still need to learn more
about the given concept.
I Already Knew That vs. Need More Info
_____________________________1. Compounds can be represented using formulas,
structures and models. Formula can be classified as either molecular or empirical formula. I
can represent chemical formulas, structural formulas and models.
_____________________________2. Atomic number and mass number are different and
can be identified using the protons, neutrons and electrons of an atom. Isotopes are classified
into 2.
_____________________________3. There are rules/concepts in naming compounds/
molecules depending if it is classified as monoatomic, binary, ternary, base and acids. Its
differences can be identified but the suffixes attached to it or the presence of certain molecules/
compounds.
ANALYZE AND EXPLORE
Chemists distinguish among several subcategories of matter based on
composition and properties. The classifications of matter include substances,
mixtures, elements, and compounds, as well as atoms and molecules.

I. ATOMIC NUMBER, MASS NUMBER AND ISOTOPES

Atomic number (Z) = number of protons in the nucleus.

Mass number (A) = number of protons + number of neutrons.
Isotopes are atoms of the same element (same number
of protons) but different numbers of neutrons.

Examples: They have the same atomic number

but different in mass number.

Try to understand the given questions below.

A. What is the atomic number of an element if one of its isotopes has 117
neutrons and a mass number of 195?
B. What is the difference between the isotopes of Uranium?
Answers:
A. Since the number of neutrons (117) and the mass number (195) are given, we can
easily identify its atomic number by subtracting the number of neutrons to the mass
number.
195 - 117 = 78. Atomic number is 78 which is Platinum.
number of neutrons = mass number – atomic number
mass number = number of protons + number of neutrons
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B. There are two primordial isotopes of uranium known as uranium-

238 and uranium-235. The other isotope of uranium is known as
uranium-234. The three isotopes of Uranium are all radioactive.
The first isotope is used in nuclear reactors and atomic bombs,
whereas the second isotope lacks the properties necessary for
these applications.

Elements like uranium, its isotopes are called uranium-235 (pronounced

“uranium two thirty-five”), uranium-238 (pronounced “uranium two thirty-eight”) and
uranium-234 (pronounced “uranium two thirty-four”).

II. MOLECULAR FORMULA AND EMPIRICAL FORMULA

An abbreviation used to indicate an element or an atom of an

element is known as chemical symbol. Chemical formulas are used to
express the composition of molecules and ionic compounds in terms of their
chemical symbols. There are two types of formulas: molecular formulas
and empirical formulas. These chemical formulas are represented not
only by the elements present but also the ratios in which the atoms are
combined.

A. Molecular formula - the exact number of atoms of each element in the smallest unit of
a substance.
Example: CH4 – molecular formula of methane

The subscript numeral indicates the number of atoms of an element present. There is
no subscript for C in CH4 because there is only one atom of carbon in a molecule of methane,
and so the number “one” is omitted from the formula.

B. Empirical formula - shows the simplest whole-number ratio of the atoms in a substance.
Example: C8H12O4 - molecular formula of dimethyl fumarate, a substance used to treat
psoriasis,
a skin disease.
The molecular formula indicate that glucose has 8 atoms of C molecules, 12 atoms of
H molecules and 4 atoms of O molecules. Although the ratio of carbon to hydrogen to oxygen
atoms in C4H6O2 is 2:3:1, it will still not be its simplest form. Dividing the subscripts by 4, we
obtain the empirical formula C2H3O.
Other examples:

MOLECULAR EMPIRICAL
H2O H2O
N2H4 NH2

III. MONOATOMIC COMPOUNDS AND POLYATOMIC ANIONS

Monoatomic Compounds
A. For cations, the name of the element is unchanged. If an element can form two ions
of
different charges, the name, which is usually derived from its Latin name, is modified by
the suffix –ic for the ion with the higher charge, and –ous for that with the lower charge.
Examples: a. Zn2+ – zinc ionc. b. Fe2+ – ferrous ion or iron (II) ion

B. For anions, the name of the element is modified by the suffix –ide.
Examples: a. Br- – bromide ion b. S2- – sulfide ion
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C. Several anions are polyatomic and are named based on the atomic constituents and
the
suffix – ide.
Examples: a. OH- – hydroxide ion b. CN- – cyanide ion

Polyatomic Anions
A. A number of polyatomic anions containing oxygen atoms are named based on the
root word of the central (or non-oxygen) atom and the suffix –ate for the one with more
oxygen atoms and –ite for the one with less oxygen atom.
Examples: a. NO3- – nitrate ion b. NO2- – nitrite ion

B. Some anions have common names ending with the suffix –ate.
Examples: a. C2H3O2- – acetate ion b. C2O42- – oxalate ion

IV. NAMING COMPOUNDS

Binary compounds – made up of two elements.

A. Ionic compounds – made up of a cation and an anion. They are named by giving the
name of the cation first, followed by the name of the anion.
Examples: a. NaI – sodium iodide b. MgCl2 – magnesium
chloride

B. Molecular compounds – made up of two non-metals. They are named by giving the
name of the first nonmetal and then that of the second nonmetal modified by the ending
- ide. Molecular compounds are usually gases.
Examples: a. HCl – hydrogen chloride b. CO2 – carbon dioxide

Ternary compounds – made up of three elements. The naming of ternary compounds

follows the same rule as that of the binary ionic compound: the name of the cation is
given first, followed by the name of the anion.
Examples: a. NaNO3 – sodium nitrate b. BaCrO4 – barium
chromate

Acids – yield hydrogen ions in aqueous solutions.

A. Binary acids – composed of hydrogen and another element, usually a nonmetal. The
first part of the name starts with the prefix hydro- followed by the name of the element,
modified by the ending –ic. The second part consists of the word ‘acid’.
Examples: a. HCl – hydrochloric acid b. H2S – hydrosulfuric acid

B. Ternary acids – made up of hydrogen and an anion, usually containing oxygen. The
first part of the name consists of the root word of the name of the element, modified by
the ending –ic. The second part consists of the word ‘acid’. If there is another acid with
the same atoms, the suffix –ous is used to denote the one with less number of atoms.
Examples: a. HNO3 – nitric acid b. HNO2 – nitrous acid

Base - defined as a substance that yields hydroxide ions (OH–) when dissolved in water.
Examples: a. KOH – potassium hydroxide b. Ba(OH)2 – barium
hydroxide

Hydrates - compounds that have a specific number of water molecules attached to them.
Example: LiCl•H2O – lithium chloride monohydrate
Source: K-12 Teacher’s Guide in General Chemistry

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Assess and Reflect:

Directions: Read and analyze the table below. Answer the needed questions.

Chemistry in Everyday Life

Compounds in Your Cabinets
Every day you encounter and use a large number of compounds. Some of these compounds are listed
below.
COMPOUND USES
NaF sodium fluoride ingredient in toothpaste
Na2CO3 sodium carbonate washing soda; used in cleaning agents
Al(OH)3 aluminum hydroxide ingredient in antacids
Na2SO3 sodium sulfite preservative
**Source: Chemistry. OpenStax College. 2015. Rice University
Chose 1-2 compounds and explain how useful are these to you? Are there any
precautionary measures in using these compounds?
_______________________________________________________________________

Congratulations!
Proceed to the next lesson.
THANK YOU! 

LESSON 3
STOICHIOMETRY: CALCULATING EMPIRICAL FORMULA
FROM PERCENT COMPOSITION
Learning Targets
 Analyze empirical formula and percent composition.
 Calculate the empirical formula from the percent composition of a compound.
 Show understanding regarding percent composition of compounds in
application to the real-life situations/ examples.
Introduction
Compounds tell the number of atoms in each element. However, suppose
we needed to verify the purity of a compound for use in a laboratory experiment,
calculating what percent of the total mass of the compound is contributed by each
element will be used. By comparing the result to the percent composition obtained
experimentally for our sample, we could determine the purity of the sample.
REVISITING CONCEPTS
Read and analyze the given concept below. Make sure to understand it for it is
related to the lesson.
PERCENT COMPOSITION BY MASS
The percent composition by mass is the percent by mass of each element in a
compound.

Mathematically,

with n = the number of atoms of the element

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Examples:
1. CO2

2. Determine the percent composition of C in C3H8.

mass C
%C   100%
mass C 3 H 8
3  12.01 g
  100%
44.11 g
 81.68%
NOTE: The first example used the unit of molar mass which is g/mol while the 2 nd example
indicated the mass of the element.
Source: K-12 Teacher’s Guide in General Chemistry 1
ANALYZE AND EXPLORE
EMPIRICAL FORMULA FROM PERCENT COMPOSITION

The empirical formula of a compound can be calculated from the percent

composition. Because percentage is given, it is convenient to assume 100.00
grams of the compound.
Examples:
1. A compound is found to consist of 7.81% C and 92.19% Cl. What is the empirical
formula of the compound?

The compound is C0.650Cl2.601.

To convert to whole numbers, divide the number of moles by the smallest value (that is
0.650).

The empirical formula is C1Cl4 or CCl4.

2. A compound is found to consist of 43.64% P and 56.36% O. The molar mass for the
compound is 283.88 g/mol. What is the empirical formula and molecular formula of
the compound?

The compound is PO2.5. But the subscripts are still not whole numbers. Multiply the
subscripts by a factor to get the smallest whole number. When multiplied by 2, the empirical
formula is P2O5.

Mass of P2O5 = 141.94 g/mol

Molar mass = 283.88 g/mol
Therefore, the molecular formula is (P2O5)2 or P4O10.

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1. Suppose that in one experiment the combustion of 11.5 g of ethanol produced 22.0 g
of CO2 and 13.5 g of H2O. Determine the number of moles of each element present
in 100 grams of compound. What is its empirical formula?

The number of moles of each element present in 11.5 g of ethanol is

The formula of ethanol is therefore C 0.50

H 1.5 O 0.25 (we round off the number of
moles to two significant figures). Because
the number of atoms must be an integer, we
divide the subscripts by 0.25, the smallest
subscript, and obtain for the empirical
formula C2H6O (C2H5OH).
Sources:
K-12 Teacher’s Guide in General Chemistry 2.
Chang, R. & Goldsby, K. 2016. Chemistry. 12th Ed. New York. McGraw-Hill

Proceed to the Activity Sheet on page 13.

Answer Activity #3. After answering, return to this page.

Directions: Summarize in one sentence the key point of the lesson.

__________________________________________________________________________

Congratulations!
Proceed to the Assesssment.
THANK YOU! 

REFERENCES:
 Bettelheim, F. et al. 2011. Introduction to General, Organic, and Biochemistry. New
York. McGraw-Hill Education
 Chang, R. & Goldsby, K. 2016. Chemistry. 12th Ed. New York. McGraw-Hill Education
 Commission on Higher Education. (2016). K-12 Teacher’s Guide in General
Chemistry 1. Philippines.
 Alternative Delivery Mode, First Edition 2020, General Chemistry 1
 Weebly. Panchbhaya. Properties of Matter. Retrieved 07/2020 from
http://panchbhaya.weebly.com/chemistry-ch5---properties-of-matter.html
 Siyavula Technology-powered learning. 2015. Siyavula Education
 OpenStax College.2015. Chemistry. Rice University

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Name of Learner: ___________________________________ Date: _________________

Grade and Section: ___________________________ Score: ________________
Parent’s Name and Signature: ___________________________

GENERAL CHEMISTRY 1
ACTIVITY SHEET: (Q1: Module 1)

Activity #1: CONCEPT MAPPING

Directions: Analyze and complete the concept map below about the properties of matter.

Activity #2: SENTENCE COMPETION

Directions: Complete the given sentences to come up with a meaningful concept. You may chose
from the words below. Choose only the letter of your answer and on the space provided on each
number.

A. segregating B. composition C. Consumer Products D. pure E. 6

F. 12 G. separating H. Chemical formula I. Chemical Symbol
J. 1 K. Carbon L. Calcium M. Distillation N. Electrolysis

1. ____is a chemical decomposition of breakdown produced by passing an electric current

through a liquid or solution containing ions.
2, ____ are the goods that are bought for consumption by the average consumer.
3-5. The method of _____ components of mixtures is a procedure or process of ____ or moving
the constituent or part of a substance which is made up of two or more ____ substances.
6. ____ refers to the ingredients or constituents
7. There is/are ____ hydrogen atom/s present in this chemical formula C 6H12O6.
8. _____ is shorthand of expressing the types and the number of atoms present in a substance.
9. C is the chemical symbol for ______.
10. ____ is a process that involves the evaporation and condensation of a liquid solvent from a
mixture or solution.

Activity #3: PROBLEM SOLVING

Directions: Analyze the problem below. Solve for the answer.

Problem: A certain compound is found to have the following percent compositions:

C = 60%, H = 4.48%, O = 35.52%.
Find the empirical formula of the compound?

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Name of Learner: ___________________________________ Date: _________________

Grade and Section: ___________________________ Score: ________________
Parent’s Name and Signature: ___________________________

GENERAL CHEMISTRY 1
ASSESSMENT: (Q1: Module 1)

Directions: Read analyze the given parts of the assessment. (35 points)

I. Multiple Choice: Choose the BEST answer. Write the letter of your answer on the
space provided before each number. (25 points)

______1. A chemical change is different than a physical change because in chemical change _.
A. Chemicals are used
B. Molecules do not physically touch
C. A new substance is formed and in physical change no new substance is formed
D. The change can be seen but in physical change it cannot.
______2. How can a mixture of sand, salt, water and paper be separated?
I. filter the mixtures to separate the sand from salt solution
II. use the tong to separate the paper from the mixtures
III. evaporate the mixtures to separate the salt from water
A. I, II and III B. II, I and III C. III, II and I D. III, I and II
_____3. Chemical properties of matter are classified into three groups which are
the ability to rust, flammability and reactivity. Which of the following BEST defines reactivity?
A. Reactivity is the ability of matter to change shape according to its temperature.
B. Reactivity is the ability of matter to react chemically with other substances.
C. Reactivity refers to the ability of matter to resist external forces such as weathering.
D.Reactivity refers to the inability of matter to react chemically with other substances.
_____4. Suppose you have a glass of unknown liquid that you want to identify. It
looks like milk, but you cannot be sure. How could it be determined?
A. taste the unknown liquid C. guess the unknown liquid
B. smell the unknown liquid D. none of the above
_____5. Suppose you have a bag of cans that you want to recycle. The recycling center accepts
only aluminum cans. You know that some of your cans contain steel. You would probably find it
difficult to tell aluminum cans from steel ones just by looking at them. How would you separate
the cans?
A. use magnets to separate aluminum from steel.
B. boil them to separate aluminum from steel
C. place them in water to separate aluminum from steel
D. all of the above
_____6. Which property depends on the amount of matter present?
A. extensive B. intensive C. hardness D. mass
_____7. Using their properties mixtures can be separated too. When iron and wooden match
mixed and you wish to separate them, how would it be possible?
A. place them in water C. dissolve them in water
B. use magnet to attract the iron D. get their densities
____8. Which of the following explains the importance of knowing percent composition, consumer
products/compounds and properties of compounds?
A. It can be used to know and verify the purity of a compound for laboratory use and
experiment.
B. Knowing the compounds in consumer products, properties and compositions of
compounds can solve real-life problems through innovation.
C. Every compound can be dangerous and give potential harm; knowing its composition
and properties may guide someone on proper handling and disposal of compounds.
D. All of these
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_____9. To what classification of properties of matter do the hardness,

temperature, color, size and smoothness belong to?
A. States of matter C. Physical properties
B. Chemical properties D. Elements and compounds
_____10. Which of the following tells you that a chemical change has occurred?
A. Change in color B. Change in shape C. melting D. vaporizing
_____11. The following are types of consumer product EXCEPT:
A. Convenience B. Specialty C. Shopping D. Sought
_____12. The goods that are frequent and immediately bought by consumers are classified as__.
A. Convenience B. Specialty C. Shopping D. Unsought
_____13. Which product requires heavy promotion to attract buyers or consumers?
A. Convenience B. Specialty C. Shopping D. Sought
_____14. When consumer looks for seals to make sure if it is approved by responsible agencies.
Then, consumer is looking for_________________.
A. Cost B. Quality C. Safety D. Use
_____15. What do we call the individuals that purchase goods or services for personal use?
A. Buyers B. Consumers C. Constituents D. Clients
_____16. The formula that shows the number and kind of atoms which a substance of a molecule
contained, is known as
A. chemical formula B. compound formula C. atomic formula D. molecular formula
_____17. Which of the following has the correct formula for Magnesium sulfate?
A. MgSO B. MgSO2 C. MgSO3 D. MgSO4
_____18. Which of the following products should be properly labeled as “X” due to its toxicity?
A. acetic acid B. citric acid C. carbonic acid D. hydrochloric acid
_____19. Which of the following does NOT belong to the group?
A. ethyl alcohol B. soda water C. plaster of paris D. sodium acetate
_____20. The following are true EXCEPT:
A. (H2O2) (Hydrogen peroxide) C. (H2O) (Water)
B. (Na2CO3) (Sodium carbonate) D. (Na4HPO4)(Sodium bicarbonate)
_____21.The following are isotopes of Hydrogen EXCEPT.
A. 1H B. 2H C. 3H D. 4H
_____22. In an element, the atomic number is the number of ____________.
A. proton B. electron C. neutron D. all of the above
_____23. Nanay Julia always use table salt in cooking different meals but in a moderate
amount. What is the chemical formula of table salt?
A. TaSt B. NaCl C. CO2 D. Cr3N2
_____24. I-131 is a radioactive iodine salt that alters the mechanism of iodine absorption in the
thyroid gland. Which of the following shows its number of protons and neutrons?
A. P-53, N-78 B. P-73, N-58 C. P-54, N-77 D. P-78, N-53
_____25. Uranium-238 has 92 protons. Which of the following shows its number of neutrons?
A. 239 B. 92 C. 146 D. 330

II. Completion: Complete the given table. (4 points)

NAME OF
FORMULA FORMULA NAME OF COMPOUND
COMPOUND
1 potassium sulfate 3 HClO4
2 sulfur trioxide 4 Cr2S3

III. Problem Solving: Analyze the given problem. Compute and show your solutions. Box
your final answer to the problem. You may use the Periodic table attached on page 18.
(6 points)

Problem:
Based from the gathered data of a researcher during his laboratory, he found a compound
with a molar mass of 163.94 g/mol. The percent composition of the elements are as follows: 42.1%
Na, 18.9% P and 39.0% O. Identify the empirical formula and molecular formula of the compound?

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PERFORMANCE TASK (20 points)

Schematic Diagram

Directions: Read the given experiment regarding separation of mixtures. Create a schematic
diagram (step by step illustration) about its procedure. Your schematic diagram should only
consist of illustrations/sketches of materials, procedure and written amounts of substances or time
involved in the activity. Write your answer on a separate paper. A rubric will be used in grading
your output. (You may use a separate paper for your answer.)

Title: SEPARATE ME
Materials: Mixture of sand, salt, and pepper, 2 index cards, comb, felt, graduated cylinder, spoon,
water, coffee filter, funnel, small cup, pie tin
Procedure:
1. Examine the mixture and the materials provided. Design an illustration of step by step
procedure for separating the different substances in your mixture. Carefully consider the order in
which you will try each step.
2. Explain why you chose the steps you did for each substance.

Guide Questions:
1. Do you think your procedure will be a successful experiment? Why or why not?
____________________________________________________________________________
2. How does knowing the properties of matter help you separate the substances in mixture?
____________________________________________________________________________
Conclusion:
____________________________________________________________________________

Criteria 1 2 3 4
Content and The schematic The schematic The schematic The schematic
Scientific diagram is diagram somewhat diagram indicates diagram indicates
Accuracy incorrect and indicates an an understanding of an understanding of
lacks scientific understanding of the experimental the experimental
accuracy. the experimental procedure but procedure and
procedure but shows some shows scientific
contains a lot of scientific errors. accuracy.
scientific errors.
Diagrams/ The diagrams, The diagrams, The diagrams, The diagrams,
Laboratory sketches and sketches and sketches and sketches and
Equipment laboratory laboratory laboratory laboratory
and Sketches equipments are equipments are equipment are clear equipments are
difficult to somewhat easy to but some materials clear and easy to
understand and understand. Some are missing in the understand. All the
are not used. materials are procedure. necessary materials
Most of the missing and not are present in the
important needed in the procedure.
materials are experiment.
missing.
Labels/ The labels are The labels are The labels are The labels are
Words used written improperly correctly matched correctly matched properly written and
and didn’t match the the correctly matched
the illustrations/sketch illustrations/sketche the
illustrations/sketc es but not written s. The words used illustrations/sketche
hes. The words properly. The are suitable for the s. The words used
used are not words used are experiment but are suitable for the
suitable for the suitable for the some experiment.
experiment. experiment but measurements and Measurements and
Incomplete most time required in the time required in the
labels. measurements and procedure are procedure are
time required in the incomplete. shown and stated.

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Department of Education

procedure are
incomplete.
Originality The schematic The schematic The schematic The schematic
diagram didn’t diagram somewhat diagram shows diagram shows
show originality shows originality originality and originality and
and creativity of and creativity of somewhat creativity creativity of work.
work work. of work.
Neatness and The schematic The schematic The schematic The schematic
Organization diagram is sloppy diagram is in diagram is diagram is well
and unorganized. organized matter organized and organized, neat and
but doesn’t some presented neat but cohesive.
up the overall some parts are
procedure. Some unclear.
parts are not neat
and hard to
understand.

Congratulations! You have completed this module.

THANK YOU! 
OTHER READING NOTES:
A. Types of Chemical Compounds and their Formula

B. Other Common Chemical Compounds

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Source: National Center for Biotechnology Information (2020). PubChem Periodic Table of
Elements. Retrieved July 29, 2020 from https://pubchem.ncbi.nlm.nih.gov/periodic-table/.

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