CHAPTER 4 (IFSTA 7TH EDITION) QUESTIONS AND ANSWERS 2025
True or False: Oxidizers affect a fire because they are combustible - (ANSWER)False. Oxidizers are not
combustible but will support or enhance combustion
Physical science is the study of what two things? - (ANSWER)Matter and energy
Oxidation - (ANSWER)A chemical reaction involving the combination of an oxidizer, such as oxygen in
the air, with other materials.
Energy - (ANSWER)The capacity to perform work
Work - (ANSWER)This occurs when a force is applied to an object over a distance or when a substance
undergoes a chemical, biological, or physical change. In the case of heat, work means increasing a
substance's temperature
Potential Energy - (ANSWER)The amount of energy that an object can release at some point in the
future. Stored energy
Heat of Combustion - (ANSWER)The potential energy available for release in the combustion process
Kinetic Energy - (ANSWER)The energy that a moving object possesses
What are the 7 types of energy? - (ANSWER)Chemical
Thermal
Mechanical
Electrical
Light
Nuclear
Sound
, CHAPTER 4 (IFSTA 7TH EDITION) QUESTIONS AND ANSWERS 2025
How is energy measured in the International System of Units (SI)? - (ANSWER)With joules
How many joules is required to change the temperature of 1 gram of water by 1 degree Celsius? -
(ANSWER)4.2J
In the customary system, the unit of measurement for heat is what? - (ANSWER)The British Thermal Unit
(Btu)
What is the British thermal unit? - (ANSWER)The amount of heat required to raise the temperature of 1
pound of water by 1 degree Fahrenheit
1 Btu equals how many joules? - (ANSWER)1055 J
Exothermic Reactions - (ANSWER)Reactions that emit energy as they occur
Endothermic Reactions - (ANSWER)Reactions that absorb energy as they occur
What are the 3 elements to the Fire Triangle? - (ANSWER)Fuel, Oxygen, Heat
What are the 4 elements to the Fire Tetrahedron? - (ANSWER)Reducing Agent (Fuel), Oxidizing Agent,
Heat, Chemical Chain Reaction
Pyrolysis - (ANSWER)Off-gassing of a solid
Vaporization - (ANSWER)Off-gassing off liquids
True or False: Both pyrolysis and vaporization are chemical changes - (ANSWER)False. Pyrolysis is a
chemical change from a solid to a gas, but vaporization is a physical change from a liquid to a gas
True or False: Oxidizers affect a fire because they are combustible - (ANSWER)False. Oxidizers are not
combustible but will support or enhance combustion
Physical science is the study of what two things? - (ANSWER)Matter and energy
Oxidation - (ANSWER)A chemical reaction involving the combination of an oxidizer, such as oxygen in
the air, with other materials.
Energy - (ANSWER)The capacity to perform work
Work - (ANSWER)This occurs when a force is applied to an object over a distance or when a substance
undergoes a chemical, biological, or physical change. In the case of heat, work means increasing a
substance's temperature
Potential Energy - (ANSWER)The amount of energy that an object can release at some point in the
future. Stored energy
Heat of Combustion - (ANSWER)The potential energy available for release in the combustion process
Kinetic Energy - (ANSWER)The energy that a moving object possesses
What are the 7 types of energy? - (ANSWER)Chemical
Thermal
Mechanical
Electrical
Light
Nuclear
Sound
, CHAPTER 4 (IFSTA 7TH EDITION) QUESTIONS AND ANSWERS 2025
How is energy measured in the International System of Units (SI)? - (ANSWER)With joules
How many joules is required to change the temperature of 1 gram of water by 1 degree Celsius? -
(ANSWER)4.2J
In the customary system, the unit of measurement for heat is what? - (ANSWER)The British Thermal Unit
(Btu)
What is the British thermal unit? - (ANSWER)The amount of heat required to raise the temperature of 1
pound of water by 1 degree Fahrenheit
1 Btu equals how many joules? - (ANSWER)1055 J
Exothermic Reactions - (ANSWER)Reactions that emit energy as they occur
Endothermic Reactions - (ANSWER)Reactions that absorb energy as they occur
What are the 3 elements to the Fire Triangle? - (ANSWER)Fuel, Oxygen, Heat
What are the 4 elements to the Fire Tetrahedron? - (ANSWER)Reducing Agent (Fuel), Oxidizing Agent,
Heat, Chemical Chain Reaction
Pyrolysis - (ANSWER)Off-gassing of a solid
Vaporization - (ANSWER)Off-gassing off liquids
True or False: Both pyrolysis and vaporization are chemical changes - (ANSWER)False. Pyrolysis is a
chemical change from a solid to a gas, but vaporization is a physical change from a liquid to a gas
