Decide which of the following statements are True and which are False Exothermic

Question

Decide which of the following statements are True and which are False Exothermic reactions always have higher activation energies for the reverse reaction than for the forward reaction. Actual reaction rates are much greater than the collision frequency for ideal gases The half-life for a reaction aA products, that is zero order in A increases with LAJo The concentration of a catalyst never appears in the rate law of a reaction. The half-life of a second order reaction increases as the reaction proceeds. Submit Answer Tries 0/99

Explanation / Answer

a)

exothermic --> Energy in products are lower than reactants

therefore, Ea reverse = dH + Ea normal, this must be true, acitvation energy for reverse will consider dH as well

b)

True, reaction rates are much complex than those of ideal gases

c)

true, since HL = [A]/2k

d)

True, catalyst will not appear in rates

e)

True, since HL(2nd order) = 1/(2*[A]0)

as A0 decreases, half life increases

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