ONE MARK QUESTIONS:
Q.1. State First Law of thermodynamics.
Q.2.What is a thermodynamic state function?
Q.3.Give enthalpy (H) of all elements in their standard state.
Q.4. From thermodynamic point to which system the animals and plants belong?
Q.5.Predict the sign of ΔS for the following reactions.
CaCO3(s) + CO2(g) ==heat==> CaO(s) + CO2(g)
Q.6. For the reaction 2Cl(g) ==> Cl2(g),
What will be the sign of ΔH and ΔS?
Q.7. State Hess‘s Law for constant heat summation?
Q.8.What is Gibb‘s Helmhaltz equation?
Q.9.Define extensive properties.
Q.10. Give relationship between ΔH, ΔU for a reaction in gaseous state.
ANSWERS FOR ONE MARK QUESTIONS
Ans.1. Energy can neither be created nor destroyed. The energy of an isolated system is constant. U = q + w.
Ans.2. A function whose value is independent of path. eg. P, V, E, H
Ans.3. In standard state enthalpies of all elements is zero.
Ans.4. Open system.
Ans.5. ΔS is positive (entropy increases)
Ans.6. ΔH: (–ve) b/c energy is released in bond formation and ΔS: (–ve) b/c atoms combines to form molecules.
Ans.7. The change of enthalpy of reaction remains same, whether the reaction is carried out in one step or several steps.
Ans.8. ΔG = ΔH – T. ΔS
Ans.9. Properties which depends upon amount of substance called extensive properties. Volume, enthalpy, entropy.
Ans.10. ΔH = ΔU + Δn. RT.
Q.1. State First Law of thermodynamics.
Q.2.What is a thermodynamic state function?
Q.3.Give enthalpy (H) of all elements in their standard state.
Q.4. From thermodynamic point to which system the animals and plants belong?
Q.5.Predict the sign of ΔS for the following reactions.
CaCO3(s) + CO2(g) ==heat==> CaO(s) + CO2(g)
Q.6. For the reaction 2Cl(g) ==> Cl2(g),
What will be the sign of ΔH and ΔS?
Q.7. State Hess‘s Law for constant heat summation?
Q.8.What is Gibb‘s Helmhaltz equation?
Q.9.Define extensive properties.
Q.10. Give relationship between ΔH, ΔU for a reaction in gaseous state.
ANSWERS FOR ONE MARK QUESTIONS
Ans.1. Energy can neither be created nor destroyed. The energy of an isolated system is constant. U = q + w.
Ans.2. A function whose value is independent of path. eg. P, V, E, H
Ans.3. In standard state enthalpies of all elements is zero.
Ans.4. Open system.
Ans.5. ΔS is positive (entropy increases)
Ans.6. ΔH: (–ve) b/c energy is released in bond formation and ΔS: (–ve) b/c atoms combines to form molecules.
Ans.7. The change of enthalpy of reaction remains same, whether the reaction is carried out in one step or several steps.
Ans.8. ΔG = ΔH – T. ΔS
Ans.9. Properties which depends upon amount of substance called extensive properties. Volume, enthalpy, entropy.
Ans.10. ΔH = ΔU + Δn. RT.
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