THERMODYNAMICS
ONE MARK QUESTIONS:
1. State First Law of thermodynamics.
2. What is a thermodynamic state function?
3. Give enthalpy (H) of all elements in their standard state.
4. From thermodynamic point to which system the animals and plants belong?
| 5. | Predict the sign of S for the following reactions. | | ||
| | CaCO3(s) + CO2(g) | heat | CaO(s) + CO2(g) | |
| | | | ||
| 6. | For the reaction 2Cl(g) | Cl2(g), What will be the sign of H and S? | | |
7. State Hess’s Law for constant heat summation?
8. What is Gibb’s Helmhaltz equation?
9. Define extensive properties.
10. Give relationship between H, U for a reaction in gaseous state.
1. Energy can neither be created nor destroyed. The energy of an isolated system is constant. U = q + w.
2. A function whose value is independent of path. eg. P, V, E, H
3. In standard state enthalpies of all elements is zero.
4. Open system.
5. S is positive (entropy increases)
6. H: (–ve) b/c energy is released in bond formation and S: (–ve) b/c atoms combines to form molecules.
7. The change of enthalpy of reaction remains same, whether the reaction is carried out in one step or several steps.
8. G = H – T. S
9. Properties which depends upon amount of substance called extensive properties. Volume, enthalpy, entropy.
10. H = U + ng. RT.
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