Republic of the Philippines
UNIVERSITY OF EASTERN PHILIPPINES
University Town, Catarman, Northern Samar
COLLEGE OF EDUCATION
Secondary Education Department
Detailed Lesson Plan in Chemistry 3B
Year Level:
Grade 9
Subject: Science
Cooperating Teacher:
(Chemistry)
Prof. Rita D. Gordo
3rd
Week No:
3
Date
2/6/2025
Student Teacher: Lloyd Reyniel I. Morallos
Quarter:
I.
OBJECTIVES
Content Standard
Performance Standards
Learning Competencies
II. SUBJECT MATTER
Strategy
Knowledge
Skills
Attitude
III.
LEARNING RESOURCES
References
Students will demonstrate an understanding of the Ideal
Gas Law by describing its components and applications,
including how it relates to the behavior of gases under
different conditions and its limitations in real-world
applications.
Students will accurately solve problems involving the
Ideal Gas law by calculating unknown variables in
various scenarios, demonstrating their understanding
through
written
explanations
and
graphical
representations.
 Explain the relationship between pressure,
volume, temperature, and the number of moles
in ideal gas law equation PV = nRT.
 Demonstrate appreciation for the practical
applications of the Ideal Gas Law in real-world
scenarios.
 Solve problems related to Ideal Gas Law by
calculating unknown variables (pressure,
volume, temperature, or number of moles) using
appropriate mathematical techniques and units.
Topic: Gas Law
Sub-topic: Ideal Gas Law
Cooperative Learning, Lesson Objective, Laboratory
Experiment, Class Discussion, and Powerpoint
Presentation
Familiarize with the content of the unit by answering the
evaluation
Relate prior knowledge to the concepts to be learned in
the lesson.
Exhibit intellectual honesty and responsibility in
answering the summative-assessment
www.byjus.com
www.vedantu.com
www.youtube.com
You and the Natural World: Chemistry
Materials
IV.
PROCEDURES
A. Preparatory Activities




Laptop
Marker
Chalk
Smart TV
STUDENT’S ACTIVITY
• Prayer
“Before we start our class, please stand “In the Name of the Father of the Son and of the Holy
up for a prayer.?”
Spirit. Amen. “

Greetings
“A wonderful day, everyone. Good
morning!”
“Good Morning, Sir.”
“How’s your day today?”
“That’s great to hear.”
“It’s good, Sir.”
“Are you ready for this day’s new
acquirement of learnings?”
“Yes, we are!”
“Very Good!”
• Checking of Attendance
“For your attendance, I want everyone to
get ¼ sheet of paper, write your name,
grade and section and date today.
 Review
“Now that you ¼ is ready, I want you to
answer the following questions.
1. Give the formula for the Dalton’s
Law
2. Give one (1) example of real-life
application of Dalton’s Law.

Setting of Class Policy
“Before we proceed to our next topic, let’s
have first a recap.”
“Let me tell you our class policy before
we begin our proper discussion.”
 Respect everyone inside the
classroom.
 When someone is speaking, stay
silent and just listen.
 If there’s something to say, raise
hand.
 Participate with the activities that
are going to be made.
1. PTOTAL = P1 + P2 + P3 + …….. Pn
2. Scuba Diving, Medical Oxygen Therapy, Air
Travel

Obey all the policies given.
“Can I expect that from you?”
Absolutely Sir!
“Alright. Thank you!”
 Collecting of Assignment
“Did you have an assignment last Yes, Sir
meeting?”
“Kindly, pass it in front.”
Here is our Assignment sir
“Thank you!”
B. Motivational Activity
Before we proceed to our discussionproper, we will have a game. Are you
excited?
Yes, sir!
This game is called “Ideal Gas Quest”
This game is a Crossword Puzzleconcept. You just have to fill out the
boxes from bottom and across
questions. Are you ready?
We are ready sir!
Questions
Across:
Across:
1. The unit of pressure often used
1. Atm
in gas law
2. Charles
2. Law stating that at constant
3. R
pressure, the volume of a gas is
4. N
directly proportional to its
absolute temperature.
Down:
3. The universal gas constant
1. Boyle
represented by “R”
2. Kelvin
4. The term for the amount of
3. Avogadro
substance measured in moles.
4. T
Down:
1. The law that describes the
relationship between pressure
and volume at constant
temperature.
2. The temperature scale starting at
absolute zero, used in gas law
calculations.
3. The law stating that the volume
of gas is directly proportional to
the number of moles at a
Answers:
constant temperature and
pressure.
4. The variable representing
temperature in the Ideal Gas
Law.
Did you have fun on our activity?
Yes sir! We enjoyed it very much!
These terminologies are the
manifestation of you learning our
previous topics about gas law.
C. Activity
Activity: Egg in a Bottle
“For our activity, we will be doing an
experiment which will pretty much relate
to our topic which we will dive in later on.
The objective of this activity is to
determine the relationship among Crystal clear sir!
temperature, pressure, and volume of
gases at constant number of moles.
Understood?
I want you to prepare the following
materials:




Hard-boiled egg
A glass bottle with a mouth just
slightly smaller than the egg
Paper
Match
I have here papers with the instructions Instructions:
included. Please read the instructions
1. Remove the shell from the egg. Set the egg in
accordingly!
the mouth of the bottle to see that the egg does
not fit through the mouth.
2. Fold the piece of paper into a strip that can be
dropped into the bottle.
3. Light the match and use it to ignite the folded
strip of paper. Remove the egg from the mouth
of the bottle and drop the burning strip of paper
into the bottle. Before the fire goes out, set the
egg back onto the mouth of the bottle. Observe
what happens.
That was very fascinating. Was it fun
everyone? Did you enjoy our activity?
It was super fun sir! It really made me learn something
D. Analysis
Now that we are done with the activity.
Please answer the question based on
what you have observed.
Questions:
Answer:
1. Why does the egg slide into the
1. It is being pushed by the surrounding air
bottle, even though no one is
pressure as a result of changes in temperature
pushing it?
and volume of air inside the bottle.
Isn’t it fascinating? The gas law really
gives us surprises.
Yes sir! We didn’t expect that to happen. It is like magic
in disguise.
E. Abstraction
We are now done with the experiment.
Let us now dive into our discussion
proper.
Are you still with me?
Yes sir!
Kindly read our objectives for today’s
lesson
At the end of this lesson, the learners are expected to:



Explain the relationship between pressure,
volume, temperature, and the number of moles
in ideal gas law equation PV = nRT.
Demonstrate appreciation for the practical
applications of the Ideal Gas Law in real-world
scenarios.
Solve problems related to Ideal Gas Law by
calculating unknown variables (pressure,
volume, temperature, or number of moles)
using appropriate mathematical techniques and
units
We have now past the different gas laws
and today, we will be studying the Ideal
Gas Law.
What is the difference of Ideal Gas law Ideal Gas law is a combination of Boyle’s, Charles’,
to other gas laws?
and Gay-Lussac’s Laws.
That is correct. But what is it
fundamental principles? Its variables?
We don’t know yet sir
Let us find out shall we?
Absolutely sir!
The Ideal Gas Law is a fundamental
equation in chemistry and physics that
describes the behavior of ideal gases. It
is expressed as PV = nRT, where P is the
pressure of the gas, V is its volume, n is
the number of moles, R is the universal
gas constant, and T is the absolute
temperature in Kelvin. This law combines
several empirical gas laws and provides
a
comprehensive
framework
for
understanding gas behavior under
various conditions.
Now class, what is the mathematical
expression / formula for Ideal Gas Law?
PV = nRT
Very good!
And what are those variables behind the
Ideal Gas Law?
●
●
●
●
Pressure (P): The force exerted by gas
particles colliding with the walls of their
container.
Volume (V): The space occupied by the gas.
Number of Moles (n): A measure of the amount
of substance in terms of particles.
Gas Constant (R): A proportionality constant
that relates energy to temperature in gas
equations. (0.0821 L.atm/mol.K)
The Ideal Gas Law serves as an
approximation for many gases under low
pressures and high temperatures, where
gas molecules behave independently.
However, it has limitations and may not
accurately predict behavior under
extreme conditions.
Due to this so-called limitations, we can
derive the formula so that we can solve
according to what is required.
Class, what are the different derivations 1. Pressure (P):
of formulas under Ideal Gas law?
P = nRT / V
2. Volume (V):
V = nRT / P
3. Number of Moles (n):
n = PV / RT
4. Temperature (T):
T = PV / nR
Now let us try solving different problems Yes Sir!
under Ideal Gas Law. Are you ready?
Sample Problems
Finding Pressure (P)
Answers:
1.
Given: V = 20 L, n = 1 mol, T = 300 K
Problem 1: A gas occupies a volume of Required: P
20 L, has 1 mole of gas, and is at a
Equation: P = nRT / V
temperature of 300 K. Find the
pressure.
Substitute: P = (1)(0.0821)(300) / 20
Answer: P = 24.63 / 20 = 1.2315 atm
Problem 2: A gas has a pressure of 3
atm, contains 2 moles, and is at a
temperature of 350 K. What is the
volume?
2.
Given: P = 3 atm, n = 2 mol, T = 350 K
Required: V
Equation: V = nRT / P
Substitute: V = (2)(0.0821)(350) / 3
Answer: V = 57.485 / 3 = 19.16167 L
Problem 3: A gas is contained in a
volume of 15 L at a pressure of 4 atm
and a temperature of 300 K. Calculate
the number of moles.
3.
Given: V = 15 L, P = 4 atm, T = 300 K
Required: n
Equation: n = PV / RT
Substitute: n = (4)(15) / (0.0821)(300)
Answer: n ≈ 60 / 24.63 ≈ 2.44 mol
Problem 4: A gas occupies a volume of
4.
25 L at a pressure of 2 atm with an
Given: V = 25 L, P = 2 atm, n ≈3 mol
unknown number of moles which is
Required: T
determined to be around three moles
Equation: T = PV / nR
after calculation.
Substitute: T ≈ (2)(25) / (3)(0.0821)
Answer ≈ T ≈50/0.2463 ≈203 K
Are you now confident in solving
problems using different equations of
Ideal Gas Law?
Yes, sir! I think we can do it!
What do you think is the easiest method GRESA sir
to solve problems?
How do you say so?
Because it simply places up every variables in order.
Very good!
F. Application
I will be showing you a picture of real-Yes, Sir!
world application of the Ideal Gas Law. I
will be asking question/s about it. It that
clear?
Question:
How does the Ideal Gas Law help us The Ideal Gas Law helps us understand thunderstorms
understand thunderstorms? Describe by showing how temperature and pressure in the air
how changes in temperature andare related. When warm air rises, it expands and cools,
pressure in the air can lead to thewhich can lower the air pressure. As the air cools, it
formation of a thunderstorm.
can hold less moisture, causing water vapor to
condense into clouds. If enough warm, moist air rises
quickly, it can lead to the development of a
thunderstorm. By studying these changes in
temperature and pressure, meteorologists can predict
when thunderstorms are likely to happen.
We can notice that it reflects upon theAbsolutely, Sir!
changes in the variable which affected
the whole process. Did you understand it
now?
G. Evaluation
Class, please get a 1 whole sheet of
paper. Our evaluation is composed of
three (4) problem solving questions
about Ideal Gas Law.
Answers:
1. A container holds 5 moles of gas
1.
at a temperature of 250 K and a Given: n = 5 mol, T = 250 K, V = 10 L
volume of 10 L. Determine the Required: P
pressure.
Equation: P = nRT / V
2. A gas at a pressure of 2.5 atm Substitute: P = (5)(0.0821)(250) / 10
contains 0.5 moles and is at a Answer: P = 102.625 / 10 = 10.2625 atm
temperature of 400 K. Find the
volume.
2.
3. A container holds gas at a
Given: P = 2.5 atm, n = 0.5 mol, T = 400 K
pressure of 5 atm, volume of 10 Required: V
L, and temperature of 500 K.
Equation: V = nRT / P
Find the number of moles.
Substitute: V = (0.5)(0.0821)(400) / 2.5
4. A gas has a pressure of 4 atm in Answer: V = 16.84 / 2.5 = 6.736 L
a volume of30 L and contains an
unknown number of moles which
3.
is determined to be around two Given: P = 5 atm, V = 10 L, T = 500 K
moles after calculation.
Required: n
Equation: n = PV / RT
Substitute: n = (5)(10) / (0.0821)(500)
Answer: n ≈ 50 / 41.05 ≈ 1.22 mol
4.
Given P=4 atm, V=30 L, n≈2 mol
Required T
Equation T=PV/nR
Substitute T=(4)(30)/(2)(0.0821)
Answer T≈120/0.1642≈730 K
H. Assignment
For your Assignment, answer the Ideal
Gas Law problem. Write it in a ½ sheet
of paper.
Question:
1. A balloon has a volume of 5.0
liters and contains helium gas at
a pressure of 1.2 atm. If the
temperature of the gas is 25°C,
how many moles of helium are in
the balloon? Use the ideal gas
constant R=0.0821 L·atm/mol·K
I hope you have learned a lot today.
Thank you all for listening. Good bye
Class!
“Good bye and thank you, Sir! Thank you for teaching
us today!
Prepared By:
MORALLOS, LLOYD REYNIEL I.
Student Teacher
Noted By:
PROF. RITA D. GORDO
Cooperating Teacher