Question

why sugar + water is endothermic reaction

Answer 1

because heat is absorbed in these reaction

Answer 2

C6H12O6(s) ---> C6H12O6(aq) is an endothermic reaction. This means that there is a net flow of energy from the water in order to convert the solid form of glucose into the dissolved form. This energy is being used to pull molecules apart while in the solid phase and convert them into the dispersed molecules of the aqueous phase. 
 
 Since the energy used has left the water, the temperature of the water goes down. 

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