Simple multiple choice questions, general acid base n kinetics ???

Question 1  (0.8 points)
N2O5 is classified as an acidic oxide because it:

a. ) reacts with acids to produce a salt.  

b. ) is insoluble in water.  

c. ) reacts with water to produce OH-.  

d. ) gives a solution of nitric acid, HNO3, on dissolving.  

e. ) can act as a Lewis base by donating electron pairs.  
________________________________________

Question 2  (0.8 points)
Which of the following is a Lewis acid?

a. ) NH3  

b. ) F-  

c. ) H2O  

d. ) NH4+  

e. ) BF3  
________________________________________

Question 3  (1.0 points)
For the following:
i) -OCl > -OClO > -OClO2 > -OClO3
ii) [H2SbO4]- > [H2AsO4]- > [H2PO4]-
iii)


iv)
  
The order of anion stability is correct for which series?

(Hint: think about the trend for the conjugate acids.)

a. ) none of the above are correct  

b. ) i, ii, iv  

c. ) i, iv  

d. ) ii, iv  

e. ) iii  
________________________________________

Question 4  (0.9 points)
An acid with a Ka of 1 x 10-6 is titrated with NaOH. Roughly, what should the Ka of the indicator be?

a. ) 10-3  

b. ) 10-6  

c. ) 10-7  

d. ) 10-9  
________________________________________

Question 5  (0.9 points)
The compound RX3 decomposes according to the equation:
RX3 ---> (1/3)R + (1/3)R2X3 + X2
In an experiment, the following data were collected for the decomposition at 100°C. What is the average rate of reaction over the entire experiment?
t / s [RX3] / M
0 0.0534
4 0.0432
6 0.0222
10. 0.0135
12 0.0089
16 0.0082

a. ) 0.0028 M/s  

b. ) 0.0452 M/s  

c. ) 0.0014 M/s  

d. ) -0.0027 M/s  

e. ) 0.0057 M/s  
________________________________________

Question 6  (0.5 points)
Which of the following rate laws have an overall reaction order of 3?
i. Rate = k[A]2
ii. Rate = k[A][B]
iii. Rate = k[A]2[B]
iv. Rate = k[A]2[B]2[C]-1
v. Rate = k[3A]

a. ) i, ii  

b. ) iii, iv  

c. ) i, ii, v  

d. ) i, ii, iv  

e. ) iii, iv, v  
________________________________________

Question 7  (0.9 points)
For the reaction 4 NH3(g) + 5 O2(g) ---> 4 NO(g) + 6 H2O(g), the value of -[NH3]/t = 2.6 x 10-3 M/s at a particular time. What is the value of -[O2]/t at the same instant?

a. ) 1.3 x 10-2 M/s  

b. ) 2.1 x 10-3 M/s  

c. ) 2.6 x 10-3 M/s  

d. ) 3.2 x 10-3 M/s  

e. ) 520 M/s  
________________________________________

Question 8  (1.2 points)
Consider the reaction of CH3Cl (methyl chloride) with hydroxide ion:
CH3Cl + OH- --> CH3OH + Cl-
At some temperature, the following data are collected:
Initial conc/M rate after 1 min/(M/min)
[CH3Cl] [OH-]
0.1 0.1 1 x 10-4
0.2 0.1 2 x 10-4
0.1 0.2 2 x 10-4


Which statement is TRUE?

a. ) The reaction is first-order with respect to methyl chloride.  

b. ) The reaction is first-order with respect to hydroxide ion.  

c. ) The reaction is second-order overall.  

d. ) All of the above.  
________________________________________

Question 9  (0.9 points)
What is the half life (in min) of a first-order reaction for which the rate constant is 1.3 x 10-3 s-1?

a. ) 0.0054 min  

b. ) 0.15 min  

c. ) 1.5 min  

d. ) 8.9 min  

e. ) 5.3 x 102 min  
________________________________________

Question 10  (1.2 points)
A certain first-order reaction is 45% complete in 65 s. If the initial concentration of the reactant is 1.0 x 10-2 M, what is the half-life for this process?

a. ) 56 s  

b. ) 65 s  

c. ) 1.3 min  

d. ) 56 min  

e. ) 75 min  
________________________________________

Question 11  (0.9 points)

The rate law for the decomposition of cyclobutane into ethylene is unimolecular.
For this reaction, which of the following could be the units of k?

a. ) s  

b. ) mol L-1 s-1  

c. ) L mol-1 s-1  

d. ) s-1  

Attached file(s):

chem q.doc  View File