25. Can an object have a negative heat capacity? Why or why not? 26. What are th

Question

25. Can an object have a negative heat capacity? Why or why not? 26. What are the signs of q and w for boiling water? 27. Explain the effect of non-zero atomic volume on the ideal gas law at high pressure. Sketch a graph of volume vs 1/P for an ideal gas and for a real gas. 28. Use the postulates of kinetic molecular theory to provide molecular explanations of Boyle's Law and Charles's law. 29. An endothermic reaction feels cold to the touch Yet it is also true that in endothermic reactions the products of the reaction are at a higher energy state the reactants. How something can gain energy yet feel cold? Explain how this is possible and where the energy is going 30. The enthalpy of a system is affected by the physical states of the reactants and products e.g. H:O and HeOp have different enthalpies of formation). Explain why.

Explanation / Answer

25.sol:-

Yes , an object can have a negative heat capacity but this is possible only when change in temperature i.e T becomes negative , because  

Heat absorb or evolve(Q) = mass of object in g(m) x specific heat capacity (C) x change in temperature ( T= T2-T1).

If T1> T2 , T = -ve , m always have +ve value and Q=+ve, then C = -ve.

therefore , heat capacity also have negative value when Q = +ve ( i.e heat absorb).

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