Fire Behavior

Question 1

What is Physical Science ?

Answer 1

Physical Science is the study o the physical world around us and includes the sciences of chemistry and physics. (pg.86)

Question 2

True or False

In order for anything to burn, heat has to be generated faster than it can be dissipated, and this causes a significant increase in temperature

Answer 2

True (pg.86)

Question 3

What is Matter ?

Answer 3

Matter is anything that occupies space and has mass ( weight) . Matter can undergo many types of physical and chemical changes. (pg.87)

Question 4

What is a physical change?

Answer 4

A physical change occurs when a substance remains chemically the same but changes in size,shape or appearance. (pg.87)

Question 5

What is a chemical change ?

Answer 5

When a substance changes from one type of matter into another. This chemical change often involves the reaction of two or more substances to form other types of compounds. (pg.87)

Question 6

True or False

Oxidation is a chemical reaction involving the combination of oxygen ( or similar types of substances) with other materials.

Answer 6

True

Oxidation can be slow, such as the combination of oxygen with iron to form rust, or rapid, as in combustion of methane ( natural gas ). (pg.87)

Question 7

Is this example a physical change or a chemical change ?

Water freezing or boiling

Answer 7

A physical change pg(87)

A physical change occurs when a substance remains chemically the same but changes in size,shape, or appearance.

Water freezing is changing water from a liquid to a solid, but the actual chemical make-up remains the same.
Water boiling is changing water from a liquid to a solid but the actual chemical make-up remains the same

Question 8

Is this example a physical change or a chemical change ?

Combustion of methane or Combining oxygen with iron to form rust

Answer 8

Chemical change pg(87)

A chemical change often involves the reaction of two or more substances to form other types of compounds. This will change the chemical make-up.

Question 9

Reactions that give of energy as they occur are called __________ ?

Answer 9

Exothermic pg(87)

Question 10

What is combustion ?

Answer 10

.An exothermic chemical reaction that is a self-sustaining process of rapid oxidation of a fuel, that produces heat and light. pg(87)

Question 11

Reactions that absorb energy as they occur are called ________ ?

Answer 11

Endothermic pg(87)

Question 12

True or False

Converting water from a liquid to a gas ( steam) requires the input of energy and is an endothermic physical reaction.

Answer 12

True pg(87)

Question 13

What composes the fire triangle ?

Answer 13

Oxygen, fuel and heat (pg87)

Question 14

True or False

You have to remove at least two of the three components for a fire to be extinguished

Answer 14

False (pg87)

Remove any of the three components and a fire cannot start. If burning , it will be extinguished

Question 15

What are the four elements that compose the fire tetrahedron ? Why use it over the fire triangle ?

Answer 15

Oxygen,fuel,heat, and a self-sustained chemical chain reaction (pg87)
Flaming combustion is more accurately explained using the fire tetrahedron. The fire triangle provides a reasonable explanation of nonflaming or smoldering combustion

Question 16

Define Potential Energy ?

Answer 16

Stored energy possessed by an object that can be released in the future to perform work pg(89)

Question 17

Define Kinetic Energy ?

Answer 17

The energy possessed by a moving object pg(89)

Question 18

Define Fire Tetrahedron ?

Answer 18

Model of the four elements/conditions required to have a fire. The four sides of the tetrahedron represent fuel,heat,oxygen, and chemical chain reaction. Pg(88)

Question 19

Define Autoignition Temperature

Answer 19

Same as ignition temperature except that no external ignition source is required for ignition because the material itself has been heated to ignition temperature pg(90)

Question 20

Define Conduction

Answer 20

Physical flow or transfer of heat energy from one body to another through direct contact or an intervening medium from the point where the heat is produced to another location or from a region of high temperature to a region of low temperature pg(94)

Question 21

Define Convection

Answer 21

Transfer of heat by the movement of heated fluids or gases, usually