Lord, we offer to you our class today. We pray that through your Divine
Guidance, we would learn how to listen attentively to the inputs of our
teacher. May we appreciate his/her effort in imparting his/her knowledge to
us. May we participate actively in the discussions and activities, so we could
learn more while having fun. May we value each other’s contributions as a
building block towards harmony and peace. Grant that as we interact with
one another, we recognize the fact that all our learning activities should be
accomplished for your greater glory. Grant that we recognize YOU in each
of our classmates and teachers. As we leave for home, we pray that you
keep us safe from harm and illnesses. And we would be able to apply
correctly what we have learned from school. All these we ask in your
powerful name.
Amen.
2
REMINDER!
3
Objectives:
+ Investigate how gases behave in different
factors such as temperature, volume, and
pressure
+ explain the factors that affect gas movement
by using a simulation/program; and
+ value the importance of gases on Earth to
humans.
4
Essential Questions:
1. What real life situations can you apply
the behavior of gases?
2. Why do gases play an important role on
life?
Inflate / Deflate
6
Inflate or Deflate?
Water can exists in 3
phases of matter.
7
Inflate or Deflate?
Gases can take up the
space of a container.
8
Inflate or Deflate?
Condensation is the process
of turning Solids into Liquids.
9
Inflate or Deflate?
Colder Gases is denser
compared to Hotter Gases.
.
10
Inflate or Deflate?
Balloons can
float up into
outer space.
.
11
Behavior of gases
Group activity – phet simulation
•
GROUP 1
GROUP 2
GROUP 3
Start with 10 nm
of volume, add
300 Heavy
Particles,
decrease the
volume to 5 nm.
Start with 10 nm
of volume, add
300 Heavy and
Light Particles,
increase the
temperature to
900 K.
Start with 5 nm of
volume, add 50
Heavy and Light
Particles,
decrease the
temperature to
50 K.
13
What are the properties of
gases?
● Gases have no definite shape and volume.
They follow the shape of the containers and
occupy all the spaces available.
● Gases are easily compressed when pressure
is applied.
● Gases expand when heated and contract
when cooled.
14
What are the properties of
gases?
• Gases exert pressure.
• The densities of gases are relatively small
compared to the densities of solids
and liquids.
• The force of intermolecular attraction between
gas particles is negligible’
• Gases mix evenly and completely when
contained in the same vessel.
15
What are the measurable properties of gases?
1. Pressure is defined as force per unit area.
Pressure= force/ area
Units of pressure: Pascal (Pa), atmosphere (atm.), torr
(torr), and millimeter
mercury (mm. Hg.)
1 atm = 760 torr = 760 mm Hg
1 torr = 1mm.Hg
1 atm = 101 326 Pa
16
What are the measurable properties of gases?
2. Volume is the space it occupies.
Common units of volume used in gas measurements
are cubic meter(m3), cubic
centimeter (cm3), liter(L), and milliliter(ml)
1 L = 1000 ml = 1000cm
17
What are the measurable properties of gases?
3. Temperature
The temperature of a gas is determine using
thermometer. It is expressed in
three units, the degree Celsius(oC), degree Fahrenheit
(oF), and kelvin(K).
oC = 5/9 (oF – 32)
oF = 9/5 (oC) + 32
K = oC + 32
18
What are the measurable properties of gases?
4. Amount of gases
The quantity of the gas being measured is always
expressed in moles or n.
Number of moles = mass of the gas/ molar mass of the
gas
n = m/MM
19
What are the five assumptions of kinetic
molecular theory?
1.Gases are made up of atoms or molecules that
continuously move in random
and straight- line motion.
2.The distance between particles of gases is so wide
compared to their individual
sizes. A gas particle is mostly empty space or with negligible
volume.
3.The force of attraction between gas molecules is almost
negligible
20
What are the five assumptions of kinetic
molecular theory?
4. The collision between gas particles and the walls of their
container is perfectly elastic.
5. The average kinetic energy of a gas is proportional to its
temperature in Kelvin.
21
How do flammable gases behave in the
presence of fire?
22
1. Gas Explosion
(https://www.youtube.com/watch?v=iX
wQ5uLCk-8)
2. Gas Explosion
(https://www.youtube.com/watch?v=9S
sgsd6Wxrs)
23
What is the difference of the two video and how
can avoid that kind of situations?
How do flammable gases behave in the
presence of fire?
24
25
26
Essential Questions:
1. What real life situations can you apply
the behavior of gases?
2. Why do gases play an important role on
life?
Essential Questions:
1. What real life situations can you apply
the behavior of gases?
2. Why do gases play an important role on
life?
29
Assessment
Google forms:
https://docs.google.com/forms/d/1
OjJu_AzT0t3_rqeDmaNRzHvp8x8je2fLX2iKaQR3CY/edi
t#responses
30
ASSIGNMENT
Read and
Review for the
next topic:
Gas Laws
31
Thanks!
32