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State and explain the first law of therm...

State and explain the first law of thermochemistry.

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If enthalpy of formation of a compound is -x kJ, enthalpy of its decomposition into its elements is +xkJ.
Example : `C(S) + O_(2)(g) rarr CO_(2) , Delta H = -xkJ` According to the law (Lavoisier and Laplace law). `CO_(2(g)) rarr C(S) + O_(2)(g), Delta H = +xkJ`
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SUBHASH PUBLICATION-CHEMICAL THERMODYNAMICS-Two marks questions and answers :
  1. Give an example for the relation between Delta H and Delta U.

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  2. What are exothermic and endothermic chemical reactions?

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  3. State and explain the first law of thermochemistry.

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  4. Explain standard enthalpy of reaction.

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  5. Explain standard enthalpy of subslimation [Delta("sub")H^(@)).

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  6. Explain standard enthalpy of formation (Delta(f)H^(@)).

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

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  8. Explain bond dissociation enthalpy.

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

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

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

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

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

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

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

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

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

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

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

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

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