Predict the substance with the greater intermolecular force in each pair SO_2 O_
ID: 1019236 • Letter: P
Question
Predict the substance with the greater intermolecular force in each pair SO_2 O_2 HF HBr Li(aq) Cs (aq) CH_4 CF_4 C_6H_6 C_10H_a4 Cls-C_2 H_2F_2 C_10H_14 cis-C_2H_2F_2 trans-C_2H_2F_2 The conversion of A to B is a first order reaction with t_1/2 = 10 minutes. Starting with 0.300 M A, the time required for the [A] to reach 0.075 M is 10 min 20 min 30 min impossible to tell For the reaction N_2(g) + 3 H_2(g) rightarrow 2 NH_3 (g), the reaction rate in terms of the change in concentration of H_2(g) would be -Delta [H_2]/Delta t -1/3 Delta [H_2] Delta t Delta [H_2]/Delta t 1/3 Delta [H_2]/Delta t The reaction A(g) rightarrow 2B(g) has a half-life of 20 minutes. Doubling the initial concentration of A has no effect on the half-life. The rate law R = k[A] R = k[A]^2 R = k R = k[A][B]^2 The exothermic reaction: R z(g) + D(g) is at equilibrium. Predict the effect of each of the following changes In the equilibrium [Z] by choosing the correct letter from the following increases [Z] decreases [Z] no effect on [Z] Add R Remove some D Raise the temperature Decrease the volume of the container Add a catalystExplanation / Answer
6. Greater intermolecular force for,
1. A) SO2
2. A) HF
3. A) Li+(aq)
4. B) CF4
5. B) C10H14
6. B) trans-C2H2F2
7. rate constant (k) = ln2/t1/2 = 0.693/10 = 0.0693 min-1
for first order reaction,
time (t) = (ln[Ao] - ln[A])/k = (ln(0.3) - ln(0.075)/0.0693 = 20 min
B) 20 min
8. Rate of change with respect to H2 is,
B) -1/3d[H2]/dt
9. Change in initial concentration has no effect of half-life, so reaction is first order with respect to [A],
A) R = k[A]
Effect of reaction parameters according to LeChatellier's principle,
10. Add R : A) increase [Z]
11. Remove some D : A) increase [Z]
12. Raise temperature : B) decrease [Z]
13. Decrease volume of container : B) decrease [Z]
14. Add catalyst : A) increase [Z]