Molecular systems tend to move spontaneously to a state of maximum randomness or
ID: 499732 • Letter: M
Question
Molecular systems tend to move spontaneously to a state of maximum randomness or disorder Molecular randomness, or disorder, is called entropy and is denoted by the symbol S. As a state function, entropy change, Delta S. depends only on initial and final states. Delta S has a positive value when disorder increases and a negative value when disorder decreases. The following conditions usually result in an increase in entropy: a change of phase: solid rightarrow liquid rightarrow gas. an increase in the number of gas molecules, or a solid dissolving to form a solution. Although the sign of the entropy change can be predicted as described above, the actual value of Delta S degree must be calculated from the absolute entropy values, S degree, of the reactants and products: Delta S degree = S degree (products) - S degree (reactants) Predict the sign of the entropy change. Delta S degree, for each of the reaction displayed. Drag the appropriate items to their respective bins.Explanation / Answer
The first reaction involving barium sulphate has negative entropy as the ions in dissolved state are getting precipitated.
The second reaction involving KClO3 has positive entropy as their is an increase in number of gas particles in the form of of oxygen in products side
The third reaction involving N2O has positive entropy as their is an overall increase in number of gaseous particles in products side.
The forth reaction involving water has negative entropy as the gaseous reactants unite to form products which are in liquid state.
The fifth reaction involving C7H16 has positive entropy as there is an overall increase in number of gaseous particles in product side
The last reaction involving water has positive entropy as the number of gaseous particles has increased in product side.
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