Question

In: Chemistry

Classify the following phase changes by the signs of the system's ΔH and ΔS.

Classify the following phase changes by the signs of the system's ΔH and ΔS.

Solutions

Expert Solution

There are no systems seen in the question

However, this may help you to solve it by yourself

If ΔH is positive, it is called an endothermic reaction

If ΔH is negative, it is called an exothermic reaction.

If ΔS is positive, then it is said that randomness increased.

If ΔS is negative, then it is said that randomness decreased.

We know ΔG = ΔH - TΔS.

Enthalpy change

Entropy change

Gibbs free energy

Spontaneity

positive

positive

It depends on T, maybe + or -

yes, if the temperature is high enough

negative

positive

always negative

always spontaneous

negative

negative

It depends on T, maybe + or -

yes, if the temperature is low enough

positive

negative

always positive

never spontaneous

Dr. OWL answered 3 years ago
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