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You are watching: Which of the following processes is endothermic?
DefinitionAn exothermic procedure is one that gives off heat. This heat is transferred to the surroundings.An endothermic procedure is one in i beg your pardon heat has to be supplied to the mechanism from the surroundings.A thermoneutral process is one the neither requires warm from the surroundings nor gives off energy to the surroundings.
These terms room usually applied to chemistry reactions. A chemistry reaction have the right to only be among these 3 terms at once. A reaction that is exothermic will certainly be endothermic if run backward and vice-versa.
Exothermic chemical reactions liberate heat. A straightforward and familiar instance 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 one of the products on the appropriate (products) side of the reaction if us wished. The ax enthalpy, H, is used by chemistry to describe how heat flows into or the end of a system.
For one exothermic reaction, the adjust in enthalpy, ΔH, together we walk from reaction (methane and also oxygen) to commodities (carbon dioxide and water) is a negative quantity. For an endothermic reaction, ΔH is better than zero. And also for a thermoneutral reaction ΔH = 0.
ΔH tells us just how much heat power will be given off or will be compelled for a specific chemical reaction. That doesn"t tell us whether the reaction will take place or just how fast.
Endothermic reactions are usually no a an excellent safety hazard. However, because the reaction draws warm from that is surroundings, the reaction container may come to be cold and also cause condensation or ice cream to form. This can be a safety danger if the materials involved react v water.
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Many usual chemicals undergo exothermic reactions. Because that example, just dissolving salt hydroxide (NaOH) in water produces sufficient heat the if this is not done carefully it can melt a plastic container! our entry ~ above oxidation has an example of an even much more exothermic reaction.
The warmth that a chemical reaction offers off can conveniently heat the bordering area (or remainder of the chemicals in the container) to an extremely high temperature. Together temperature increases, the rate of chemistry reactions typically increase together well. Thus, once an exothermic reaction begins, the can conveniently "run away" -- accelerating its rate since of the warm produced. This deserve to be particularly dangerous if the material reaches that flash allude or autoignition temperature, in ~ which point a fire or explosion can occur.
Therefore, that is an extremely important to know when a chemical reaction deserve to generate overabundance heat and to take suitable measures to attend to this. Examples include slow mixing, utilizing a cooling bath, or preventing that reaction. Most mixtures of not compatible chemicals show off violently quick exothermic reactions.
See also: autoignition temperature, flash point, oxidation.
Additional definitions native Google and OneLook.
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