Question

A student observed a chemical reaction take place in an insulated calorimeter.CaO + H2O + Ca(OH)2The student noted that the temperature of the system increased 6.7 °C.Which statement best explains why the temperature increased during the reaction?A. The reaction absorbs heat from the calorimeter.O B. The calorimeter lets heat in to warm up the water.O c. The enthalpy of the product is greater than the enthalpy of the reactants.O D. The energy released as bonds are formed is greater than the energy required to break bonds.

Answer 1

First, let's remember the concepts of spontaneous and nonspontaneous reaction:

A spontaneous reaction is a reaction that favors the formation of products at the conditions under which the reaction is occurring. This would be called an exothermic reaction, it releases energy.

A nonspontaneous reaction is a reaction that does not favor the formation of products at the given set of conditions. In order for a reaction to be nonspontaneous, it must be endothermic, accompanied by a decrease in entropy, or both.

In this case, when the reaction takes place, the temperature of the system increases which means that heat is released and heat is a form of energy. Energy is released.

The answer based on this logic would be D.