Heat may evolved or absorbed during a ______ change.

Under what condition, the heat evolved or absorbed in a reaction is equal to its free energy change ?.

Heat is evolved during ________ reaction .

Change in volume of a solid during heating is __________.

Give an example where heat, light and sound are produced during a chemical change.

When an electric current is passed in a circuit consisting of two different metals, heat is evolved at one junction and absorbed at the other end. This is known as _________ .

Reaction , in which heat is absorbed , are called ______.

The chemical reaction in which heat is absorbed is called "______" reaction

The efficiency of heat engine is 30%. If it gives 30 KJ heat to the heat sink, then it should have absorbed _____ KJ heat from heat source.