NFPA Chapter 5 Exam 2025 Questions
and Answers
Combustion - ANSWER✔✔-a chemical process of oxidation that occurs at a rate fast enough to
produce heat and usually light in the form of either a glow or flame
Fire - ANSWER✔✔-a rapid oxidation process which is a chemical reaction resulting in the
evolution of light and heat in varying intensities
Heat - ANSWER✔✔-a form of energy characterized by vibration of molecules and capable of
initiating and supporting chemical changes and changes of state
Temperature - ANSWER✔✔-measure of a material's ability to transfer heat energy to other objects
Fuel - ANSWER✔✔-a material that will maintain combustion under specified environmental
conditions
Oxidizer - ANSWER✔✔-any material that readily yields oxygen or other oxidizing gas, or that
readily reacts to promote or initiate combustion of combustible materials.
Matter - ANSWER✔✔-anything that occupies space and has mass
Energy - ANSWER✔✔-capacity to perform work
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, Oxidation - ANSWER✔✔-chemical process that occurs when a substance combines with an
oxidizer such as oxygen in the air
Physical Science - ANSWER✔✔-the study of matter and energy and includes chemistry and physics
Physical Change - ANSWER✔✔-a substance remains chemically the same but changes in size,
shape, or appearance
Chemical Reaction - ANSWER✔✔-when a substance changes from one type of matter into
another, such as two or more substances combining to form compounds
Potential Energy - ANSWER✔✔-stored energy possessed by an object that can be released in the
future to perform work once released
Kinetic Energy - ANSWER✔✔-the energy possessed by a body because of its motion
Exothermic Reaction - ANSWER✔✔-chemical reaction that releases thermal energy or heat
Endothermic Reaction - ANSWER✔✔-chemical reaction that absorbs thermal energy or heat
Pyrolysis - ANSWER✔✔-the chemical decomposition of a solid material by heating
Vaporization - ANSWER✔✔-physical process that changes a liquid into a gaseous state
Ignition - ANSWER✔✔-the process of initiating self-sustained combustion
Piloted Ignition - ANSWER✔✔-moment when a mixture of fuel and oxygen encounters an external
heat (ignition) source with sufficient heat or thermal energy to start combustion reaction
Autoignition - ANSWER✔✔-initiation of combustion by heat but without a spark or flame
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
and Answers
Combustion - ANSWER✔✔-a chemical process of oxidation that occurs at a rate fast enough to
produce heat and usually light in the form of either a glow or flame
Fire - ANSWER✔✔-a rapid oxidation process which is a chemical reaction resulting in the
evolution of light and heat in varying intensities
Heat - ANSWER✔✔-a form of energy characterized by vibration of molecules and capable of
initiating and supporting chemical changes and changes of state
Temperature - ANSWER✔✔-measure of a material's ability to transfer heat energy to other objects
Fuel - ANSWER✔✔-a material that will maintain combustion under specified environmental
conditions
Oxidizer - ANSWER✔✔-any material that readily yields oxygen or other oxidizing gas, or that
readily reacts to promote or initiate combustion of combustible materials.
Matter - ANSWER✔✔-anything that occupies space and has mass
Energy - ANSWER✔✔-capacity to perform work
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
, Oxidation - ANSWER✔✔-chemical process that occurs when a substance combines with an
oxidizer such as oxygen in the air
Physical Science - ANSWER✔✔-the study of matter and energy and includes chemistry and physics
Physical Change - ANSWER✔✔-a substance remains chemically the same but changes in size,
shape, or appearance
Chemical Reaction - ANSWER✔✔-when a substance changes from one type of matter into
another, such as two or more substances combining to form compounds
Potential Energy - ANSWER✔✔-stored energy possessed by an object that can be released in the
future to perform work once released
Kinetic Energy - ANSWER✔✔-the energy possessed by a body because of its motion
Exothermic Reaction - ANSWER✔✔-chemical reaction that releases thermal energy or heat
Endothermic Reaction - ANSWER✔✔-chemical reaction that absorbs thermal energy or heat
Pyrolysis - ANSWER✔✔-the chemical decomposition of a solid material by heating
Vaporization - ANSWER✔✔-physical process that changes a liquid into a gaseous state
Ignition - ANSWER✔✔-the process of initiating self-sustained combustion
Piloted Ignition - ANSWER✔✔-moment when a mixture of fuel and oxygen encounters an external
heat (ignition) source with sufficient heat or thermal energy to start combustion reaction
Autoignition - ANSWER✔✔-initiation of combustion by heat but without a spark or flame
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
