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Flashcards in Chapter 3 Deck (70)
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1

Which of the following occurs when a substance remains chemically the same but changes in size, shape, or appearance?

Physical change

2

When a substance changes from one type of matter to another?

Chemical change.

3

A chemical reaction involving the combination of oxygen (or similar types of substances) with other materials?

Oxidation

4

Reactions that give off energy as they occur?

Exothermic reaction

5

Refers to reactions that absorb energy as they occur

Endothermic reactions

6


Modes of combustion are different based on:


Where the reaction is occuring

 

 

7


Which mode of combustion requires liquid or solid fuels to be converted to the gas phase or vaporized?


Flaming combustion

8


Which mode of combustion occurs when solid fuels undergo oxidation at the surface of the fuel.


Nonflaming or smoldering combustion

9


What are the three components of the fire triangle?


Oxygen, Fuel, and Heat.

10


Flaming combustion is accurately best explained by what?


The fire tetrahedron

11


What are the elements of the fire tetrahedron?


Oxygen, Fuel, Heat, and a self-sustained chemical reaction.

12


Energy possessed by a moving object.


Kinetic energy

13


Temperature is a messurment of:


Kinetic energy

14


In the customary system, the unit of measure for heat is:


British thermal units (BTU)

15


Applying large amounts of heat to solid fuels such as wood causes.


Pyrolysis

16


What is the temperature to which the surface of a substance must be heated for ignition and self-sustained combustion to occur?


Autoignition temperature

17


What is the most common source of heat in combustion reactions?


Chemical heat energy

18


What occurs when any combustible is in contact with oxygen?


Oxidation

19


What mode of electrical heat energy occurs when electric current flows through a conductor at a normal design limit?


Resistance Heating

20


What type of heat energy is generated by friction or compression?


Mechanical heat energy

21


The rate at which heat is transfered is related to the temperature differentialof the bodies and

Thermal conductivity of the material involved

22


What refers to the transfer of heat within a body or to another body by direct contact


Conduction

23


What refers to the transfer of heat energy from a fluid (liquid or gas) to a solid surface?


Convection

24

What refers to transmission of energy as an electromagnetic wave without an intervening medium?


Radiation

25


What is the dominant mode of heat transfer when a fire grows in size?


Radiant heat

26


What refers to materials that absorb heat but do not participate actively in the combustion reaction?


Passive agents

27


Fuel in combustion is known as the


Reducing agent

28


For flaming combustion to occur, fuels must be in the:

Gaseous state

29


In order to burn, liquids must be:


Vaporized

30


What refers to the temperature at which a liquid gives off sufficient vaporsto ignite, but not sustain, combustion?


Flash point