Compare how entropy changes for the following two systems:

system a: two gases mix when the valve separating two containers is opened.

system b: a solid powder decomposes to form a solid product and a gas product.

Explanation:

Entropy is defined as the amount of randomness present within the molecules of a substance.

So, when in system A, two gases mix together then it means there will be increase in number of molecules. As a result, there will be increase in number of collisions which will lead to increase in randomness of molecules.In system B, a solid powder is decomposing to given a solid product and a gas.

As gas molecules are held by weak forces so, they will rapidly move from one place to another. Hence, there will be increase in randomness of the molecules.

As a result, there will also be increase in entropy of system B.

A. Entropy increases

B. entropy increases

Explanation:

Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

A. Two gases mix when the valve separating two containers is opened: The gases will intermix and thus there will be more disorder in the system.

B. A solid powder decomposes to form a solid product and a gas product.

The energy is absorbed by the solid reactant and thus it is endothermic and the solid reactants are converting to gaseous products, thus the entropy increases.

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