Question

Justify the following sentences by answering (T) for TRUE or (F) for FALSE. (1 mark each) AE is independent on the initial and final state of a system. The sum of entropy changes of the system and surroundings is always positive. The ratio of numerical values of partial pressures of the reaction participants is unitless. Q is small if products pressures are small, a large Q means a negative or good (favorable) contribution to the free energy For pure solids or liquids, the activity is equal to 1 at 1 atm, If the change in Gibbs free energy is negative, the reverse reaction can spontaneously occur. The voltages must be multiplied by two when two electrons involved. When 20g of HF is dissolved in 1L of water then (HF) equals 0.4 mol/L For the isolated system, there is no change in surroundings. Therefore, AS > Zero. In Galvanic cell, right electrode, oxidation takes place, electron being produced. For an open system, spontaneous processes are accompanied by a decrease in m, Autops 0, at equilibrium Au tp = 0 Platinum metal electrodes are used for galvanic cell, because they are chemically active. If x is negative, standard free energy is negative, thus the reaction does not occur spontaneously. The oxidation of solid glycine by gaseous Oz will form CO2(g), H2O(l) and NH3(1). Endothermic reactions that absorb heat (+q, +AE at constant V and +AH at constant T) According to Boyle's law; pressure and volume are inversely related at constant temperature.

Answer 1

1.False , ∆E is a state function it depends only on initial and final state regardless of path followed. If we know initial and final temperature we can find change in internal energy easily. Internal energy is a strong function of temperature.

2 .False , for reversible process it is zero but for irreversible process it is positive because of heat generation due to friction.

3.True , if we take ratio of two quantities having same unit it becomes unitless.

4.No Q depends on how much heat is being transferred to / from system, it is positive when it is given to system and negative when it is extracted from system.

5. False , only at standard state activity becomes 1.

6.True, if change is Gibbs energy is negative process is spontaneous