Burning candle chemical change1/23/2024 Chemical: the formation of a precipitate and the color change from colorless to yellow indicate a chemical change.No color change occurred or other evidence of chemical change. The green mixture is still green and the colorless solution is still colorless. Physical: because none of the properties changed, this is a physical change.However, when the candle burns, the chemical composition of the wax is altered, making it a chemical change rather than a physical one.\) The molecules are simply rearranged in a different state. When the candle burns, the wax slowly melts which freezes after some time (Physical change). Burning of candle is both physical and chemical change. It is a reversible reaction and no new substance is formed. For example, melting the wax of a candle to change its state from solid to liquid is a physical change because the chemical composition of the wax remains the same. In melting of wax, only the state of wax changes from solid to liquid. In contrast, physical changes do not involve the rearrangement of atoms or the formation of new substances. These changes are not reversible, and the original wax cannot be recovered from the byproducts of combustion. The original wax molecules are broken apart, and new molecules are formed. When we light a candle, we heat the wick up with a flame that initiates a combustion reaction on the wick, what we commonly refer to. Answer 4: The burning of a candle is a chemical reaction between the wick and the ambient air. Thus both the changes are accompanied by the burning of the candle. As the candle's flame keeps radiating heat, it continues to melt more wax and burn more of the wick, until it is gone. Again the wax combines with the atmospheric oxygen and changes to carbon dioxide, heat and light. Burning of the candle melts the wax and hence physical state of wax has changed from solid to liquid. 5ĭuring the burning of a candle, the wax molecules undergo a chemical reaction with oxygen from the air, leading to the formation of carbon dioxide and water vapor. Correct option is A) Burning of the candle is both physical and chemical change. Physical changes typically involve alterations in the physical properties of a substance, such as its shape, size, or state, without any change in its chemical composition. The burning of a candle is not considered a physical change because it involves a chemical reaction that results in the formation of new substances. Why is burning of candle not a physical change? This releases light, heat, carbon dioxide and water vapor, and fuels the flame. The melted wax vaporizes through a combustion reaction, where hydrocarbons interact with oxygen to break into its two components: hydrogen and carbon. Therefore, because the burning of a candle involves a chemical reaction that results in the formation of new substances, it is considered a chemical change. When you light a candle, the heat of the flame melts the wax surrounding the wick. These chemical changes are irreversible, meaning that the original wax cannot be recovered from the combustion products. The chemical bonds within the hydrocarbons are broken, and new chemical bonds are formed with oxygen to produce carbon dioxide (CO2) and water (H2O) as byproducts. Once the liquid wax reaches the flame, it vaporizes and undergoes combustion.ĭuring the combustion process, the hydrocarbons in the wax react with oxygen from the air, releasing energy in the form of heat and light. The liquid wax is then drawn up the wick due to capillary action. 4 When the wick of the candle is lit, the heat of the flame melts the wax near the wick. In this video I use what you should know about the fire triangle to show you that a candle burning is an example of a chemical change. In the case of a candle, the fuel is the wax, which is usually made up of hydrocarbons, such as long-chain alkanes. 2 Combustion is a rapid chemical reaction between a fuel and an oxidizer (typically oxygen) that produces heat, light, and often other byproducts. The burning of a candle is considered a chemical change because it involves a chemical reaction known as combustion. Why is burning of candle a chemical change?
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