Who re-introduces Democritus' theory of atoms back into modern science in the 1800's? A. John Dalton
B. Neils Bohr
C. James Chadwick
D. J. J. Thompson
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Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.

Putting salt in vinegar water