Question

#1. In an exothermic reaction, the bonding energy of the product is:

less than the reactants/ same as the reactants
greater than the reactants/ dependent on the presence of a catalyst. #2.Which of the following reactions is not a chemical reaction?


melting an ice cube/ tarnishing of a silver spoon
digestion of food/ the browning of a freshly sliced apple

Answer 1

In an exothermic reaction, the overall enthalpy is negative. This means the bonding energy of the product is less than the bonding energy of the reactants. In 2) the melting of an ice cube is not a chemical reaction.