Question

An endothermic reaction is carried out in a coffee-cup calorimeter (with water). Which statement(s) is(are) incorrect for this process?

I. The temperature of the water decreases.

II. The enthalpy change for the reaction equals qH2O.

III. Heat is absorbed by the water.

IV. The enthalpy change for the reaction is positive.

V. The products have higher enthalpy than the reactants.

Answer 1

I. The temperature of the water decreases. -- > TRUE since system absorbs energy

II. The enthalpy change for the reaction equals qH2O. --> false, since it must acocount the calorimeter aswell

III. Heat is absorbed by the water. --> true, endothermic by definition

IV. The enthalpy change for the reaction is positive. -> true, for rxn system, endothermic

V. The products have higher enthalpy than the reactants. --> false, heat is released, so products have less energy