Is candle wax burning a physical change?
No. Burning candle wax, or anything for that matter, is a chemical change.
New substances are being formed and old ones consumed, so this is a chemical change. The melting of the candle wax is a physical change. The burning of the wick is a chemical change. When a candle burns, both a physical and chemical change takes place. The melting of the wax is the physical change, whereas the chemical change is the combustion of the wax and the wick.
Burning of candle is both a physical as well as chemical change. Chemical because the wick is burned, which is a combustion reaction, and physical because the melting of the was is a physical change. The melting of the wax is a physical change because you're just changing the form of the wax, not it's chemical properties. When you melt wax and it hardens, it's still wax, just in a different shape. Burning is a…
It is both. For the wick and some of the wax, it is a chemical change. They burn (oxidize) into carbon dioxide, water, and other compounds such as carbon monoxide. For the rest of the wax, it is obviously a physical change. It melts and then become solid again as it cools. But there is less wax remaining than was present in the original candle. This wax was what provided the energy released by the…
It is a chemical change. Burning the candle wick converts it into CO2 and water when it reacts with the heat and oxygen in the air. The wax melting is a physical change. ----------------------------------------- Phenomena during the candle burning: - melting (physical phenomenon) - evaporation (may be considered a chemical but also a physical phenomenon) - oxidation - reaction with oxygen, burning (chemical phenomenon) - thermal decomposition (chemical phenomenon)
a physical change, because it can easily be reversed. Physical changes, like freezing or melting an ice cube, are reversible, and don't make new substances. Chemical changes are not reversible, like burning wood, or making a cake, and always make one or more new substances. You could burn candle wax to create a liquid, but then freeze it again to turn it back into solid wax, so it's a physical change.
The physical changes in the candle is that the wax melts, then freezes back into solid state again, and the chemical changes are that the wick burns, soot, and smoke. water vapor and carbon dioxide are formed. and When the wax burns, and the wax combines with the oxygen to form CO2, carbon monoxide, carbon particles (incomplete burning/oxidation) and water. After it burns, you can't get the wax back.
actually the question is not very clear to me if the questio is about the changes of physical state of a substance after a reaction then definitely the physical appearance of the substance will change while the chemical property remains the same. best example is burning of candle the wax melts changing apperarence of candle but the chemical composition of wax remains the same
Yes. While act of melting wax is a physical change, because you can remould it, the wax is actually what is primarily burned as fuel. You cannot unburn the wick nor the consumed wax. Remember, if it can be redone, it is probably physical and vice versa. The wick of a candle is used to light it and is used as a medium for burning the wax. As the wax is heated, it is soaked…
An exothermic reaction involves the release of heat into a system. The burning of a candle is combustion reaction. Combustion reaction release heat, and this can be detected and measured by the burning of a candle's wax. From these testable observations it is determined fact that candle burning is indeed exothermic.