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Yes, between reactive chemicals there is likely to be a reaction which will lead to precipitation if all the reactants and possible products are aqueous. The reactants, although aqueous, could fail to react if they are endothermic.
It's very very possible. It could also be an allergic reaction.
They should be so similar that they could be repeatable.
That could be determined fairly easily by taste. Sucrose has a sweet flavor which ethanol does not.
well i dont really know this "chemistry" things, sorry i wish i could help.
Avoid - as much as possible - foods and drinks contaiming glucose, sucrose, maltose, etc.
Salt hope I could help
The chemical reaction is:Fe + CuSO4 = FeSO4 + CuIt is a single displacement reaction.
Yes. If you think about cooling as a result of an endothermic reaction, you then realize that since all reactions are, to some degree, reversible, that it could be possible to produce another reaction that is exothermic.
Temperature
One method is a reaction between the elements. If the sulfide is insoluble it could be precipitated.
The law of conservation of mass clearly states that the mass could not have been destroyed (nor created for that matter). Theresore, when the reaction with air took place, part of the mass of the sucrose would be converted to a gaseous state, and probably a chemical reaciton with the air would create a different compound, and would escape into the atmosphere. hope this answers the question.