Understanding Entropy

Front

Entropy describes the amount of disorder in a system.

Back

Entropy is a measure of the disorder or randomness in a system.

Front

Entropy increases dramatically with a change in state.

Back

Phase changes, such as melting or vaporization, significantly increase entropy.

Front

Moles and entropy

Back

Entropy increases with an increased number of moles.

Front

Diagram showing less and more randomness in mixtures.

Back

The diagram illustrates how mixtures with more randomness have higher entropy.

Front

The number of N2O4 molecules increases as the reaction proceeds.

Back

This indicates a negative entropy change (ΔS°rxn) because the system becomes more ordered.

Front

Entropy change (ΔS°rxn) is positive when the number of molecules increases.

Back

An increase in the number of molecules generally leads to increased disorder.

Front

A decrease in the number of gas molecules typically results in a negative entropy change due to increased order.

Back

Front

ΔS° sample 2 = ΔS° sample 1

Back

This occurs when the changes observed for both samples require a net input of energy from the surroundings.

Front

Physical state change after heating.

Back

Heating causes a change in the spatial distribution of molecules in solid samples.

Front

In a rigid, insulated container, energy when a system reaches equilibrium.

Back

Energy remains constant.