This document provides information about elements and compounds. It begins by defining pure substances as either elements or compounds. Elements contain only one type of atom, while compounds contain two or more different types of atoms bonded together. Examples of common elements and their symbols are provided, along with their locations on the periodic table. Elements are also classified as metals, nonmetals, and metalloids. Examples of important compounds like water and their chemical formulas are also given. Students are then asked to classify substances as elements or compounds and answer multiple choice questions to assess their understanding of the key concepts.

1. 11/27/2020
1
SCIENCE 7ELEMENTS AND COMPOUNDS

2. MELC #2 :Recognize that substances are classified into elements and
compounds
Quarter : 1
Week : 3
OBJECTIVES:
A. Differentiates elements and compounds ;
B. Classifies substances into elements or compounds; and
C. Shows appreciation of the elements and compounds by giving an
example.

3. 1.What have you observed in the
picture?
4. Is it an element? Or a compound?
Questions:
2. What are the gases present in
air?
3. What type of pure substance is the
gas you are referring to?

4. • Pure Substance  are substances that are made up of only one kind of
particles and has a fixed or constant structure.
• Atom  are building blocks of matter.
• Molecule  consists of two or more atoms of the same element, or
different elements, that are chemically bound together.
• Element  contains only one kind of atom.
• Compound  contains two or more kinds of atom.
TERMS TO REMEMBER:

5. ELEMENT
 Pure substance that cannot be separated into simpler
substances by physical or chemical means.
 It consists of only one kind of atom.
 The chemical elements are divided into the metals, the
metalloids, and the non-metals.

6. Elements are arranged in increasing atomic number across the
periodic table presented above.
PERIODIC TABLE OF ELEMENTS
The periodic table shows 118 elements, including metals (blue),
nonmetals (red), and metalloids (green).

7. MAJOR CATEGORIES OF ELEMENTS
1. Metals  shiny , good conductors of heat and electricity, malleable (can
be hammered into thin sheets), ductile ( can be drawn into thin
wires).
Examples : Iron (Fe) , Copper (Cu)
2. Nonmetals  dull , poor conductor of heat and electricity , brittle and unmalleable.
Examples: Neon (Ne) , Bromine (Br)
3. Metalloids  have properties of both metals and nonmetals.
Examples: Silicon (Si) , Boron (B)

8. ELEMENT SYMBOL USES
Oxygen O This is the gas that everyone needs for breathing.
Carbon C It is used for fuel and as a lead of pencils which
are very essential to students.
Iron Fe This is used in making appliances , utensils and
building supports .
Chlorine Cl This is used as a disinfectant, mostly used as a
cleaning material.
Hydrogen H It is an element needed to produce water.
Calcium Ca It is the mineral that makes up bones and teeth.
Iodine I This is needed to maintain thyroid gland.
ELEMENTS THAT ARE USED IN DAILY LIFE

9. COMPOUNDS
 Pure substance that can be broken down into a simpler type of
matter (elements) by chemical means .
 It consists of atoms of two or more different elements bound
together.

10. Definite Composition of Compounds
A molecule of a compound has a
definite number of atoms.
Consider the elements of
hydrogen and oxygen.
If one atom of oxygen and two atoms
of hydrogen combine, the resulting
compound is water . This is the most
important compound in the universe.

11. COMPOUNDS SYMBOL USES
Water It is used for drinking, cleaning,
washing, cooking and other activities.
Sodium Chloride It is use to give flavor to our food.
Calcium Carbonate It is used as a building material and a
component of mortar.
Hydrochloric Acid It is an acid found in the stomach. It
primarily aids digestion.
Compounds that are used in daily life

12. I. Classify the following substances below. State if it is an element or compound.
Element 1. Nitrogen (N)
2. Ammonia (NH3)Compound
3. Water (H2O)Compound
4. Carbon (C)Element
5. Tin (Sn)Element
6. Silver (Ag)Element
7. Carbon dioxide (CO2)Compound

13. LET’S WRAP IT UP! II. MULTIPLE CHOICE: Underline the correct answer.
1. It is a good conductor of electricity.
a. Non-metals
b. Metals
c. Metalloids
d. Compounds
2. It has a property of both metals and non-metals.
a. Non-metals
b. Metals
c. Metalloids
d. Compounds
3. It contains only one kind of atom.
a. Elements
b. Compounds
c. Molecules
d. Metals
4. It is an acid found in the stomach. It primarily aids digestion.
a. Calcium carbonate
b. Citric acid
c. Sodium chloride
d. Hydrochloric acid

14. September 21, 2020
OUTPUT #1: GIVE ME FIVE…
Using short bondpaper in a table format, give at least five (5)
examples of elements and compounds found at home and give its uses.
Submit it on Friday, September 25, 2020 @ 02:00 PM in Google Classroom.
Using short bondpaper in a table format, give at least five (5)
examples of elements and compounds found at home and give its uses.
Submit it on Tuesday, September 29, 2020 @ 08:00 – 04:00 PM here in
school.
Sir Christian
LET’S BRING IT HOME:
ONLINE
MODULAR

15. ONLINE/MODULAR:
TASK: Using Venn Diagram, compare and contrast elements and compounds.
For online, use short bondpaper and submit it on Friday, September 25,
2020 in the Google Classroom.
For modular, use short bondpaper and submit it on Tuesday,
September 29, 2020 here in school.
LET’S DEEPEN MORE :