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Combustion and Flame Quiz

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Questions and Answers

Why is water ineffective for extinguishing fires caused by oil or petrol?

Water does not have the capacity to absorb heat.

Water cools the oil, causing it to solidify.

Water sinks below oil, allowing the fire to continue burning. (correct)

Water is lighter than oil, causing it to float.

What is the ignition temperature?

The minimum temperature needed to initiate combustion. (correct)

The maximum temperature a substance can reach before burning.

The temperature at which a fuel can be stored safely.

The temperature required to sustain a combustion reaction.

What dangers arise from burning coal in a closed room?

It produces oxygen, increasing fire risk.

It creates heat that can ignite nearby materials.

It releases significant amounts of carbon dioxide.

It generates carbon monoxide, which can cause suffocation. (correct)

How does respiration relate to combustion?

Respiration involves burning fuel to produce energy in a controlled manner. Signup and view all the answers

Which condition is necessary for any fuel to start burning?

An ignition temperature that exceeds the ambient temperature. Signup and view all the answers

What is a significant characteristic of complete combustion?

It does not produce smoke or soot. Signup and view all the answers

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Study Notes

Combustion and Flame

Water and Fire: Water is not effective for putting out oil or petrol fires because water is denser than these liquids, causing it to sink below and not extinguish the fire.
Ignition Temperature: A fuel requires a minimum temperature, its ignition temperature, to begin burning. Once reached, combustion becomes self-sustaining.
Burning Coal Indoors: Burning coal indoors is dangerous because it produces carbon monoxide, a toxic gas. Carbon monoxide binds to hemoglobin, reducing oxygen transport and leading to suffocation and death.
Respiration as Combustion: Respiration is a type of slow combustion. Food is oxidized (combusts in a slower, controlled process) in the presence of oxygen to release energy.

Complete vs. Incomplete Combustion

Complete Combustion: Complete combustion occurs with sufficient oxygen, resulting in a bluish flame and no smoke.
Incomplete Combustion: Incomplete combustion occurs with insufficient oxygen, producing a yellow flame and smoke containing soot particles.

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Description

Test your knowledge on the principles of combustion, including the science behind ignition temperatures, the dangers of burning different fuels, and the distinction between complete and incomplete combustion. This quiz also explores the connection between respiration and combustion processes.