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Questions and Answers
What is a flame?
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?
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?
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?
What causes a flame to be considered plasma?
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What happens to the vaporized fuel molecules in a high-temperature flame?
What happens to the vaporized fuel molecules in a high-temperature flame?
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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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