CHEMISTRY 110 SPRING 2016 E XAM2 11. For a reaction below, determine the units o

Question

CHEMISTRY 110 SPRING 2016 E XAM2 11. For a reaction below, determine the units on the rate constant. 2A(g) + 2B(g) 2C(g) + D(g) Rate kIA)[B) (a) s (b) M's (c) M's (d) M's (e) M's 12. A certain reaction has the following rate law What happens to the rate when the concentration of A is halved and B is doubled? (a) The rate is quadrupled (b) The rate does not change (c) The rate decreases by a factor of % (d) The rate is doubled (e) None of the above are correct ion reaction has a rate constant of 0.20st at 295 K, an activation l, and an Arhenius constant of 2.5 x 10s. How long would it take for the con 13. A first order decomposition reaction has a rate constant 22 kl/mol, and an Arrhenius constant of 2.5 x 10 the reactant to drop from 0.10 M to 0.025 M (a) 3.5s (b) 6.9s (c) 50s (d) 100 s (e) 290s

Explanation / Answer

1)

RATE = k[A][B]^2

Rate has ALWAYS units of mol/Vol-time

[A] = mol/vol and [B]^2 = mol^2/Vol^2

then k

k = rate/([A][B]^2 = (mol/Vol-time)/(mol/vol)(mol^2/Vol^2))

k = mol/(mol^3) * vol^3 / vol * 1/t = Volume^2 / (mol^2) /t

k = L^2/(mol^2-s)

since mol/L = M then

k = 1/(M^2-s)

12)

if A is halved and B is doubled then

rate = K*1*(2^2) = 4K

the rate is increased by a factor of 4 times (since 2^2 ) and A concnetration has no effects

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