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Both, sorta. The explosion itself is expanding hot gas, which is a purely physical reaction. However, most of the time, that's triggered by a chemical reaction to create the heat.
decrease the energy requirement of reaction, which increase the rate of reaction itself
It could mean that the candle wick was composed of or covered with a substance that can undergo spontaneous combustion, or that it can catch fire at room temperature by chemical reaction. There is no supernatural possibility behind a candle lighting apparently by itself.
It is from the aldehyde itself.
Depends, the drink itself is a chemical reaction, the CO2 bubbles. But the icecream and that is a physical reaction. Anything that changes state is a physical reaction.
Both, sorta. The explosion itself is expanding hot gas, which is a purely physical reaction. However, most of the time, that's triggered by a chemical reaction to create the heat.
A catalyst is used to SPEED up a reaction but doesn't change itself.
The product of the reaction of an alcohol C2H6O with itself is ethyl ether (C4H10O).
decrease the energy requirement of reaction, which increase the rate of reaction itself
In chemistry, they can work by adsorption (although there are other methods). This is when the catalyst attaches itself to the reactant particles and then weakens the bond between them, making it easier to react, thus 'lowering the activation energy' (the energy required for a reaction to start).
It could mean that the candle wick was composed of or covered with a substance that can undergo spontaneous combustion, or that it can catch fire at room temperature by chemical reaction. There is no supernatural possibility behind a candle lighting apparently by itself.
Combustion -- but the reaction is between alcohol and oxygen -- fire is the process or the reaction itself.
Volatile compounds in the wood undergo combustion, or reaction with oxygen, forming H20 and CO2 gases. Because of the makeup of wood being mostly carbon-based compounds, this reaction leaves behind soot and charcoal.
No. A substance will not react with itself.
Not of itself, but it can be made to be.
It is from the aldehyde itself.
catalyst