5. Choose the wrong descriptions for the degree of freedom the number of independent variables is referred to as the number of degrees of freedom the number of degrees of freedom of the intensive state of a system is same to that of the extensive state the number of degrees of freedom is defined by Gibbs phase rule when a system in composed of one component and three phases are in equilibrium with each other, the number of degrees of freedom is equal to zero when a system contains chemical reactions, the number of independent chemical reaction is not considered in the determination of the number of degrees of freedom 6. Choose the wrong statements about critical phenomina 0 A critical point in the end point of the liquid-gas The properties of the gas and liquid phases become so nearly alike but they can be distinguished as separate phases. * At a critical point, the following conditions are satisfied. ap 12 = 0 V 17= 7=T If the gas is a van der Waals gas, critical properties such as Temperature, Pressure and Volume can be expressed as a function of van der Waals constants, a and b 8a Ve= 36, Tea PC- 27 Rb 862 7. Choose the items which are not related to the second law of thermodynamics The amount of work of heat engines. The natural direction of processes. The question of whether a given chemical reaction can occur by itself. The definition of entropy. The definitions of enthalpy. 8. Choose the items which are related to the zeroth law of thermodynamics i thermal equilibrium 2 the law to define temperature the law is based on theory it is concerned with thermal equilibrium between three bodies it is related to the absolute value of entropy