Reactive Metal Fires?
Choose which of the four substances might be used in a fire-retarding agent for combating each of the three fires.
Agents:
water
CO2
sand (silicon dioxide)
carbon tetrachloride
Fires:
a) potassium burning in air
b) sodium burning in air
c) lithium burning in air
Answer:
All class D or metal fires, which will burn under water, sand would be the best.
to be quite honest, although lithium is quite reactive with air, i dont think it actually catches fire. in any case, carbon dioxide is a very stable compound, and can be used to stop most fires. however, since the cause of reaction in the alkali metals is the oxygen, and i do not know the effects of carbon dioxide on the latter 2, i would say carbon tetrachloride is your best bet
Well you can most definitely rule out water. Even though CCl4 is nonflammable, the boiling point is only 77 deg C so it would not be very effective. You would need a lot of CO2 to displace the the fuel to these types of fires (Oxygen) for it to be effective. The best choice here is sand, which would in effect smother the fire. The right fire extinguisher for these types of fires is a class D type, which has a smothering powder in them.
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Agents:
water
CO2
sand (silicon dioxide)
carbon tetrachloride
Fires:
a) potassium burning in air
b) sodium burning in air
c) lithium burning in air
Answer:
All class D or metal fires, which will burn under water, sand would be the best.
to be quite honest, although lithium is quite reactive with air, i dont think it actually catches fire. in any case, carbon dioxide is a very stable compound, and can be used to stop most fires. however, since the cause of reaction in the alkali metals is the oxygen, and i do not know the effects of carbon dioxide on the latter 2, i would say carbon tetrachloride is your best bet
Well you can most definitely rule out water. Even though CCl4 is nonflammable, the boiling point is only 77 deg C so it would not be very effective. You would need a lot of CO2 to displace the the fuel to these types of fires (Oxygen) for it to be effective. The best choice here is sand, which would in effect smother the fire. The right fire extinguisher for these types of fires is a class D type, which has a smothering powder in them.
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