Name: Date: September 23,2019
Section: St. Philip the Apostle Score:
Strand: STEM
Activity Sheet 2
Fire Triangle 2
Introduction:
Combustion is the opposite process of photosynthesis. Combustion is the breaking apart of the building blocks put
together through photosynthesis. Combustion is the release of the energy acquired during photosynthesis. Oxygen is
introduced, and bonds in the fuel of hydrogen and carbon are broken (releasing energy), the resulting hydrogen and
carbon combining separately with the oxygen as H2O and CO2, releasing heat in the process. . Carbon dioxide is
stored in the tissue, and oxygen is given off into the atmosphere. Combustion is the process of that tissue (plant
matter) burning—oxygen is consumed, and carbon dioxide and heat are released into the atmosphere.
The fire triangles or combustion triangles are simple models for understanding the necessary ingredients for most
fires. The triangle illustrates the three elements a fire needs to ignite: heat, fuel, and an oxidizing agent (usually
oxygen). A fire naturally occurs when the elements are present and combined in the right mixture, meaning that fire
is actually an event rather than a thing. Heat/ignition sources include anything capable of generating heat—
lightning, cigarettes, powerlines, catalytic converters, small engine sparks, matches, a magnifying glass. Fuel
sources include any kind of combustible material—grass, shrubs, trees, houses, propane tanks, wood piles, and
decks. Fuels are characterized by their moisture content (how wet the fuel is), size, shape, quantity, and the
arrangement in which they are spread over the landscape. The last part of the triangle is oxygen. Ambient air is
made up of approximately 21 percent oxygen and most fires require at least 16 percent oxygen content to burn
Learning Target:
1. I can distinguish what materials are necessary to create fire – the fire triangle.
Direction: List down the fire triangle from the following situations.
3 pts each.
A. Bonfire being lit while camping
B. Stove fire used for cooking rice
C. Lamp (gasera) used for areas where electricity is unavailable
D. Lighter used for lighting cigarettes
E. Grilling barbeques using charcoal
F. Lightning striking a tree
F. Newspapers being burned
G. Fire crackers/fireworks used during celebrations
H. Electrical fires during summers
J. Chemicals stored in closed environments
Name: Date: September 24,2019
Section: St. Philip the Apostle Score:
Strand: STEM
Activity Sheet 3
Fire Triangle 3
Learning Targets:
1. . I can analyze the different causes of fire.
2. I can classify based on their source or cause.
A. Direction: using the statistics from Bureau of Fire Protection (BFP) and Philippine Statistics
Authority (PSA) for 2010 – 2013, answer the following questions. (3 points each)
1. What can you say about he incidents from 2010- 2013?
2. What can you say about the number of fire causes shown in the graph?
3. Why do you think are there discrepancies between regions in terms of number of fire incidents?
B. List down 20 causes of fire based on BFP operational procedures. 1 point each.
1 6 11 16
2 7 12 17
3 8 13 18
4 9 14 19
5 10 15 20
Name: Date: September 25,2019
Section: St. Philip the Apostle Score:
Strand: STEM
Activity Sheet 4
Fire Triangle 4
Learning target:
1. I can identify the different fire classes.
Introduction:
Each fire class is based on the fuel that they burn. The classification is very useful in order to determine
what substances or chemicals are effective in extinguishing the fire.
Direction: Complete the list of data below.
Fire Class Kinds of Fuels
Example:
Class A Ordinary materials: such as
1.wood
2.paper
3.plastic
Or anything that leaves ash
Class B 1.
2.
3.
4.
5.
Class C 1.
2.
3.
Class D 1.
2.
3.
4.
5.
Class K 1.
2.
3.
Name: Date: September 26,2019
Section: St. Philip the Apostle Score:
Strand: STEM
Activity Sheet 5
Extinction of Fire
Learning Target:
I can identify how to extinguish a fire.
Introduction:
To stop a combustion reaction, one of the three elements of the fire-triangle has to be removed. Without sufficient
heat, a fire cannot begin, and it cannot continue. Heat can be removed by the application of a substance which
reduces the amount of heat available to the fire reaction. This is often water, which requires heat for phase change
from water to steam. Introducing sufficient quantities and types of powder or gas in the flame reduces the amount of
heat available for the fire reaction in the same manner. Scraping embers from a burning structure also removes the
heat source. Turning off the electricity in an electrical fire removes the ignition source.
Without fuel, a fire will stop. Fuel can be removed naturally, as where the fire has consumed all the burnable fuel,
or manually, by mechanically or chemically removing the fuel from the fire. Fuel separation is an important factor in
wildland fire suppression, and is the basis for most major tactics, such as controlled burns. The fire stops because a
lower concentration of fuel vapor in the flame leads to a decrease in energy release and a lower temperature.
Removing the fuel thereby decreases the heat. Without sufficient oxygen, a fire cannot begin, and it cannot continue.
With a decreased oxygen concentration, the combustion process slows. Oxygen can be denied to a fire using a
carbon dioxide fire extinguisher, a fire blanket or water.
Direction: Identify the methods or means of extinguishing the fire caused by the following situations
below.
A. Bonfire being lit while camping
B. Stove fire used for cooking rice
C. Lamp (gasera) used for areas where electricity is unavailable
D. Lighter used for lighting cigarettes
E. Grilling barbeques using charcoal
F. Lightning striking a tree
F. Newspapers being burned
G. Fire crackers/fireworks used during celebrations
H. Electrical fires during summers
J. Chemicals stored in closed environments
