MDCAT Chemistry Tricks :: Thermochemistry :: 20 Sec Series

[@ayeshamemon-e4j]

Mam jub liquid to solid chnge ho tub ye reaction kia hoga spontaneous nd endothermic?? Like water to ice

[@Nainajabbar10]

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[@momnanoorfatima6414]

Ma'am physical state change reactions spontaneous kese like liquid ice mn spontaneous kese hoga ,and endothermic kese ?

[@AreejFatima-um6ks]

@momnanoorfatima6414

[@AreejFatima-um6ks]

spontaneous rxn wo hote jin k lye external energy required ni hoti , to jb liquid water (higher energy state) ice (lower energy state ) me jae ga isko koi external energy input ni chahea ho g is tra ye spontaneous h r jin rxns me energy absorb ho ri hoti wo endothermic hote , so during the freezing of water it absorbs energy from environment to overcome its intermolecular forces remeber k is rxn ko initial energy nahi require start hone k lye (spontaneous) but to overcome intermolecular forces it will absorb heat (endothermic)

[@momnanoorfatima6414]

endothermic mn external energy ki need hoti h?

[@AreejFatima-um6ks]

@@momnanoorfatima6414 The conversion of liquid water into ice is spontaneous because it decreases the system's entropy, favoring a more ordered state, despite being endothermic, requiring energy input to break intermolecular bonds and form a crystalline structure.

[@AreejFatima-um6ks]

@@momnanoorfatima6414 In a spontaneous endothermic reaction, while it requires an input of energy, it can still occur spontaneously if the increase in entropy outweighs the energy required. This can happen, for example, when the system overall moves towards a state of higher disorder or greater stability. In the case of water freezing into ice, although it requires energy input (endothermic), the decrease in entropy as liquid water turns into a more ordered solid state is outweighed by other factors, making the process spontaneous.

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