Chemistry, 10.07.2019 16:00 Ericabarnes114

When do phase transitions occur in molecules? only when energy is withdrawn when energy is supplied or withdrawn only when energy is supplied when energy is neither supplied nor withdrawn

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When a substance changes their state of matter i.e. solid, liquid, gaseous state changes into different state is said to be phase transition. It occurs under specific temperature and pressure and also depends upon the environmental conditions.

For phase transition, a sufficient amount of energy is supplied for transformation of one state to another state and energy can also be withdrawn for the transformation of a state to different state as some molecules needs large amount energy and some needs small amount of energy. In this process, molecules are not present in static state, there is continuous movement of molecules takes place in this process.

Thus, when energy is withdrawn also supplied then this process occurs in the molecules.

Answer from: 023749

The answer is when energy is supplied or withdrawn.

That is phase transitions occur in molecules, when energy is supplied or withdrawn.

For example , water changing its phase from liquid to gas when energy is supplied from heating and also water changes its phase from liquid to solid when energy is withdrawn.

Answer from: Quest

Yes she is correct. the answer is completely correct

Answer from: Quest

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 : $4x (s) + 3o_{2} (g) \rightarrow 2x_{2}o_{3} (s) h rxn = -600 kj/mol$

equation 2 : $2x (s) + 3cl_{2} (g) \rightarrow 2xcl_{3} (s) h rxn = -800 kj/mol$

equation 3 : $4xcl_{3} (s) + 3o_{2} (g) \rightarrow 2x_{2}o_{3} (s) + 6cl_(2} h rxn = -200 kj/mol$

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 : $4xcl_{3} (s) \rightarrow 4x (s) + 6cl_{2} ( h rxn = (+800) \times 2 kj/mol$

let us add equation 1 & 4

$4x (s) + 3o_{2} (g) \rightarrow 2x_{2}o_{3} (s) h rxn = -600 kj/mol$

$4xcl_{3} (s) \rightarrow 4x (s) + 6cl_{2} ( h rxn = (+1600) kj/mol$

$4xcl_{3} )s) + 3o_{2} \rightarrow 2x_{2}o_{3} (s) + 6cl_{2} (g) h rxn = (+1000) kj/mol$

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

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When do phase transitions occur in molecules? only when energy is withdrawn when energy is supplied...

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