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You are watching: Which of the following is not an endothermic process
DefinitionAn exothermic process is one that provides off heat. This heat is transferred to the surroundings.An endothermic procedure is one in i beg your pardon heat needs to be provided to the system from the surroundings.A thermoneutral procedure is one the neither requires warmth from the surroundings nor provides off energy to the surroundings.
These terms space usually used to chemistry reactions. A chemistry reaction deserve to only be among these 3 terms in ~ once. A reaction that is exothermic will certainly be endothermic if run backward and vice-versa.
Exothermic chemical reactions liberate heat. A an easy and familiar example is the combustion of methane gas (CH4). The well balanced chemical reaction for this process is:CH4(g) + 2 O2 (g)
We might write "heat" as among the commodities on the appropriate (products) side of the reaction if us wished. The hatchet enthalpy, H, is used by chemistry to describe how heat flows right into or the end of a system.
For one exothermic reaction, the readjust in enthalpy, ΔH, as we go from reaction (methane and oxygen) to commodities (carbon dioxide and water) is a an adverse quantity. For an endothermic reaction, ΔH is greater than zero. And also for a thermoneutral reaction ΔH = 0.
ΔH tells us just how much heat power will be provided off or will certainly be forced for a details chemical reaction. That doesn"t tell us whether the reaction will happen or exactly how fast.
Endothermic reactions space usually no a good safety hazard. However, because the reaction draws warm from its surroundings, the reaction container may become cold and cause condensation or ice cream to form. This have the right to be a safety danger if the materials connected react with water.
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Many typical chemicals undergo exothermic reactions. Because that example, simply dissolving salt hydroxide (NaOH) in water produces enough heat that if this is not done very closely it can melt a plastic container! our entry top top oxidation has an instance of one even an ext exothermic reaction.
The heat that a chemical reaction provides off can easily heat the surrounding area (or remainder of the chemicals in the container) to very high temperature. Together temperature increases, the price of chemical reactions usually increase together well. Thus, as soon as an exothermic reaction begins, the can quickly "run away" -- increasing its rate because of the warmth produced. This can be specifically dangerous if the product reaches the flash point or autoignition temperature, in ~ which suggest a fire or explosion could occur.
Therefore, the is really important to recognize when a chemistry reaction can generate excess heat and to take proper measures to deal with this. Examples include slow mixing, utilizing a cooling bath, or avoiding that reaction. Most mixtures of incompatible chemicals indicate violently quick exothermic reactions.
See also: autoignition temperature, flash point, oxidation.
Additional definitions native Google and also OneLook.
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