Chemistry, 21.11.2019 06:31 mraymundo025p0gpw9

Identify the following statements as true or false.1) all spontaneous reactions occur quickly.2) the energy of the universe is constant; the entropy of the universe increases.3) if a process increases the randomness of the particles of a system, the entropy of the system increases.4) all systems become more disordered spontaneously.5) all spontaneous processes release heat.6) both δ ssys and δ ssurr must equal zero at equilibrium.

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Answer from: loganferg5499

The true statements are following:

Energy of the universe is constant; the entropy of the universe increases.If a process increases the randomness of the particles of a system, the entropy of the system increases.All spontaneous processes release heat.Both $\Delta S_{sys}$ and $S_{surr}$ must equal zero at equilibrium.

Explanation:

Spontaneous reactions are defined as the reaction which occur on its own and they do not require any external force to start.

All spontaneous reactions show a positive value for change in entropy. Each spontaneous reaction requires different amount of time.

Hence, the statement all spontaneous reactions occur quickly, is false.

Entropy of the Universe always increases and energy always changes from one form to another. Hence, the statement energy of the universe is constant; the entropy of the universe increases, is true.As entropy is the degree of randomness. So, with increases the randomness of the particles of a system there will also be increase in randomness.

Therefore, the statement if a process increases the randomness of the particles of a system, the entropy of the system increases, is true.

Some processes are non-spontaneous in nature. Hence, the statement all systems become more disordered spontaneously, is false.Since, randomness between the molecules increases so, heat is eventually released in all spontaneous processes. Therefore, the statement all spontaneous processes release heat, is true.For a reversible process, entropy change of the Universe is equal to 0. Therefore,

$\Delta S_{Universe} = \Delta S_{system} + \Delta S_{surrounding}$

Hence, the statement both $\Delta S_{sys}$ and $S_{surr}$ must equal zero at equilibrium, is true.

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