Question

Definition and limitations of 1st law of thermodynamics in chemistry 1

Answer 1

Here is your answer !!

Answer 2

Answer:

(i) 1st law does not indicate the direction in which the change can occur :

• When a bullet strikes a target, KE of a bullet is converted into heat energy. But heat energy developed cannot be converted back into mechanical energy of the bullet.

(ii) 1st law gives no idea about the extent of change :

• No heat engine can convert all heat energy received from source into mechanical energy.

(iii) 1st law gives no information about the source of heat :

• i.e., whether it is a hot or a cold body.