Flames and Combustion Quiz

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Questions and Answers

What is a flame?

  • The visible, gaseous part of a fire (correct)
  • The liquid part of a fire
  • The invisible, non-gaseous part of a fire
  • The solid part of a fire

What causes the fuel molecules in candle wax to vaporize?

  • Applied sound
  • Applied pressure
  • Applied light
  • Applied heat (correct)

What determines the color and temperature of a flame?

  • The type of fuel involved in the combustion (correct)
  • The presence of water vapor in the air
  • The type of oxidizer involved in the combustion
  • The type of solid materials near the flame

What causes a flame to be considered plasma?

<p>When flames are hot enough to have ionized gaseous components of sufficient density (A)</p> Signup and view all the answers

What happens to the vaporized fuel molecules in a high-temperature flame?

<p>They decompose, forming various incomplete combustion products and free radicals (C)</p> Signup and view all the answers

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Study Notes

Flame Fundamentals

  • A flame is a region of hot, glowing gas produced by a chemical reaction, typically between a fuel and an oxidizer.
  • In a candle, fuel molecules in the wax vaporize due to heat, a process known as pyrolysis.
  • The heat energy breaks the molecular bonds, allowing the fuel molecules to transition from a solid to a gas state.

Flame Characteristics

  • The color and temperature of a flame are determined by the energy released during the chemical reaction.
  • Different temperatures produce distinct colors: blue (high temperature), yellow (medium), and red (low).
  • The hottest flames, typically blue, can reach temperatures of up to 1,500°C.

Plasma State

  • A flame can be considered a plasma, a high-energy state of matter, due to the presence of ions and free electrons.
  • The intense heat energy ionizes the fuel molecules, stripping them of their electrons and creating a plasma.

High-Temperature Flame

  • In a high-temperature flame, the vaporized fuel molecules undergo a series of chemical reactions, including combustion and oxidation.
  • These reactions release energy in the form of heat and light, sustaining the flame.

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