Multiple Choice
Is the ability of a substance to support combustion considered a physical property or a chemical property?
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1. Intro to General Chemistry
Chemical Properties
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Carbon dioxide fire extinguishers are primarily designed to be used on fires involving which types of fuels?
A
Ordinary combustibles such as wood and paper
B
Electrical equipment and wiring
C
Flammable liquids such as gasoline and oil
D
Combustible metals such as magnesium and sodium
Verified step by step guidance1
Understand the classification of fires based on the type of fuel involved. Fires are categorized into classes such as Class A (ordinary combustibles), Class B (flammable liquids), Class C (electrical equipment), and Class D (combustible metals).
Recognize that carbon dioxide (CO\_2) fire extinguishers work by displacing oxygen and cooling the fire, which makes them effective on certain types of fires but not all.
Recall that CO\_2 extinguishers are especially suitable for fires involving flammable liquids (Class B) because they do not leave residue and can quickly suffocate the fire.
Note that CO\_2 extinguishers are also safe to use on electrical fires (Class C) since CO\_2 is non-conductive and does not damage electrical equipment.
Conclude that CO\_2 fire extinguishers are primarily designed for flammable liquids and electrical equipment fires, but not for ordinary combustibles or combustible metals.
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