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WEST-NES Elementary Ed Subtest II (103) Practice Tests & Test Prep by Exam Edge

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WEST-NES Elementary Education Subtest II Sample Test

1 of 5

Which of the following forms of energy does the flame from a burning candle release?

Correct Answer:

light and heat

the process of a candle burning is an example of combustion, which is a chemical reaction. typically, this involves the wax of the candle (often made from paraffin, which is a hydrocarbon) reacting with oxygen in the air. when the wax burns, it primarily undergoes a combustion reaction, during which the chemical bonds in the wax molecules are broken and new bonds are formed, releasing energy.

the energy released during the combustion of the candle wax is manifested primarily in two forms: light and heat. heat energy is released as the wax (fuel) burns in the presence of oxygen, producing carbon dioxide, water, and other byproducts. this release of heat is what we feel when we hold our hand near a burning candle. it's also what makes candles useful for warming or even heating small spaces in traditional settings.

light energy, on the other hand, is visible as the flame itself. the high temperature of the flame excites the electrons in the atoms, causing them to emit light—this process is known as incandescence. the color of the flame depends on the temperature and the substances being burned. in a typical paraffin candle, the flame usually glows with a yellowish color, indicating the presence of small soot particles that are heated to the point where they incandesce.

it's important to note that the flame does not release electrical or mechanical energy in any significant amount, and it certainly does not involve nuclear reactions. the primary outputs are simply heat and light, both of which are forms of energy directly perceptible to humans and useful in many everyday applications. thus, the correct answer to the question regarding the forms of energy released by a candle flame is light and heat.