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Explain bond dissociation enthalpy....

Explain bond dissociation enthalpy.

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It is defined as the changed in enthalpy when one mole of covalent bonds of a gaseous covalent compound is broken to form products in the gas phase.
`H_(2(g)) rarr 2H_((g)) " " Delta_(H - H) H^(@) = 435 kJ mol^(-1)`.
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SUBHASH PUBLICATION-CHEMICAL THERMODYNAMICS-Two marks questions and answers :
  1. Explain standard enthalpy of formation (Delta(f)H^(@)).

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  2. Explain standard enthalpy of combustion (Delta(c )H^(@)).

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  3. Explain bond dissociation enthalpy.

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  4. Justify the following statements : An exothermic reaction is alway...

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  5. Justify the following statements : The entropy of a substance incre...

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  6. Evaporation of water is an endothermic process but spontaneous. Explai...

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  7. Explain standard enthalpy of solution (Delta(sol)H^(@)).

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  8. At a certain temperature 'T', endothermic reaction A rarr B proceeds v...

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  9. Explain standard enthalpy of atomisation (Delta(s)H^(@))

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  10. Explain with the help of an example, the difference between bond disso...

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  11. What is meant by free energy of a system ? What will be the direction ...

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  12. Why most of the exothermic process (reaction) are spontaneous ?

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  13. The enthalpy of combustion of sulphur is 297 kJ. Write the thermochemi...

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  14. What is the most important condition for a process to be reversible in...

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  15. Why the absolute value of enthalpy cannot be determined ?

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  16. What are the applications of Hess's Law of constant heat summation?

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  17. Explain standard enthalpy of dilution.

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  18. Define Molar enthalpy of fusion.

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  19. Define Molar enthalpy of vapourisation ?

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  20. Define : (a) Enthalpy of atomization (b) Lactic enthalpy.

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