CHAP#9 Thermodynamics

482. 1 cal = 4.18 J 

483. The process in which a system goes a change of state at constant volume is called Isochoric 

484. The process in which a system goes a change of state at constant pressure is called Isobaric 

485. The process in which a system goes a change of state at constant temperature is called Isothermal 

486. The process in which a system goes a change of state where no heat can enter or leave is called Adiabatic 

487. First law of thermodynamics(ΔQ =ΔU +ΔW) is particular form of Law of conservation of energy 

488. A device which convert  heat energy into mechanical energy  Heat engine 

489. Heat cannot be converted into useful work during a Complete cycle 

490. 2nd law of thermodynamics :Efficiency of heat engine is always less than 100% Lord Kelvin Statement 

491. 2nd law of thermodynamics :It is impossible to cause heat to flow heat from a  cold body to hot body without Expenditure of energy 

493. Efficiency of Carnot heat engine is 100%

494. The efficiency of carnot engine of hot and cold temperature depends upon only 

temperature of two reservoirs

495. The process in which heat neither enter nor leave the system but still temperature of the system change is

Adiabatic process

496. The standard molar enthalpy of formation is denoted by ΔH0298 

497. Process of applying Hess’s law to the standard enthalpy changes in the formation of ionic compounds

Born Haber Cycle

498. The process which is performed quickly is Adiabatic process 

499. The work done against friction will Increase the entropy of system 

500. If an ideal gas allowed to expand adiabatically the work done by the gas is equal to The loss of internal energy 

501. If the temperature of source of heat increase, The efficiency of carnots engine   Increases