Internal Energy Change: Homework Solutions

AI Thread Summary
The discussion focuses on determining which reaction has an enthalpy change closest to zero, relating to internal energy change. The user eliminates options A and C due to their highly exothermic and endothermic nature, respectively. They narrow it down to options B and D, leaning towards D as a decomposition reaction. Additionally, they inquire about which reaction exhibits the smallest volume change at constant temperature and pressure. The analysis emphasizes understanding the relationship between enthalpy changes and internal energy in chemical reactions.
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Homework Statement


Internal Energy Change

Homework Equations


N/A

The Attempt at a Solution


If internal energy change equals enthalpy change, then I am looking for the reaction which has the enthalpy change closest to zero. I know it cannot be A, as the formation of water is highly exothermic. I know it cannot be C, as the vaporization of water is highly endothermic. This leaves B and D. I think it should be D, as it is a decomposition. I find that the breaking of bonds of halogens in B to seem endothermic.
 
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Which reaction has the smallest volume change if carried out at constant temperature and pressure?
 
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