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.

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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alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

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