Summative test

In which of the following physical states does a given substance have the highest entropy?

• solid

• gas

• liquid

• The entropy is the same because the same substance is involved.

Which of the following describes an endergonic reaction?

• must be endothermic

• is nonspontaneous

• must correspond to a decrease in entropy

• is spontaneous

What are the two factors that determine whether a reaction is spontaneous or nonspontaneous?

• entropy and disorder

• entropy and enthalpy change

• electron configuration and change

• energy and the heat of reaction

In which of these systems is the entropy decreasing?

• air escaping from a tire

• snow melting

• salt dissolving in water

• gas condensing to a liquid

Which of the following refers to all spontaneous processes?

• are exothermic

• are endothermic

• involve an increase in entropy

• release free energy

What is the expression for Keq for this reaction?

2H₂0(g) → 2H₂(g) + 0₂(g)

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In an equilibrium reaction with a Keq of 1 x 10⁸, which of the following is true?

• reactants are favoured

• reaction is nonspontaneous

• products are favoured

• reaction is exothermic

• More H₂C0₃ is produced.

• More H₂0 is produced.

• The equilibrium is pushed in the direction of reactants.

• Nothing

Doing which of the following generally increases the entropy of a substance?

• freezing it

• dissolving it in water

• condensing it

• all of the above

The Keq of a reaction is 4 x 10^-7. At equilibrium:

• the reactants are favored.

• the products are favored.

• the reactants and products are present in equal amounts.

• the rate of the reverse reaction is much greater than the rate of the forward reaction.