CA The decrease in concentration of a reac- tant X with time is as given on the table below 1. 3 01 0.049 0.0247 0.01195 0.005875 th 4 ExM The rate constant for the reaction is B. A. 0.693 C. 0.063 0.639 D. 0.603
Electronic Effects
The effect of electrons that are located in the chemical bonds within the atoms of the molecule is termed an electronic effect. The electronic effect is also explained as the effect through which the reactivity of the compound in one portion is controlled by the electron repulsion or attraction producing in another portion of the molecule.
Drawing Resonance Forms
In organic chemistry, resonance may be a mental exercise that illustrates the delocalization of electrons inside molecules within the valence bond theory of octet bonding. It entails creating several Lewis structures that, when combined, reflect the molecule's entire electronic structure. One Lewis diagram cannot explain the bonding (lone pair, double bond, octet) elaborately. A hybrid describes a combination of possible resonance structures that represents the entire delocalization of electrons within the molecule.
Using Molecular Structure To Predict Equilibrium
Equilibrium does not always imply an equal presence of reactants and products. This signifies that the reaction reaches a point when reactant and product quantities remain constant as the rate of forward and backward reaction is the same. Molecular structures of various compounds can help in predicting equilibrium.
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Answer Q54
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The decrease in concentration of a reac-
tant X with time is as given on the table
TYPE TWO QUESTIONS
below
Questions 58 - 89
DIRECTIONS: Each group of questions below
consists of four lettered headings followed by
a list of numbered questions. For each
numbered question, select the one heading
which is most closely related to it. Each
heading may be used once, more than once
or not at all.
th
(x]M
0.1 0.049 0 0247 0.01195 0.005875
The rate constant for the reaction is
0.639
0.603
A. 0.693
C. 0.063
D.
Questions 55 to 57
The kinetic study for the reaction
NO (g) + CO(g) > NO(g) + CO (g)
Questions 58 - 62.
The following techniques are used to manitor the
gave a rate expression of.
Rate = K[NO (g)ICO(g). At 325 C the
variation of the initial rate with [NO (g)) is
progress of some reactions with time.
Dilatometry
Conductrimetry D.
Calorimetry
Titrametry
A.
B.
C.
Select from the techniques A to D the one that is
most suitable for foilowing up the rates of the
given below.
Experiment Initial rate
moldm 's
INO (a)]moldm
reactions below
No.
58. NO(g) + 0 () 0(g) + NO,(g)
59. (CH )3C-Br(i)+H.O(1) (CH )3C-
OH)+HBr(aq)
60. H2O2(10
0.10
0.15
2
0.40
0.30
0.16
0 60
AMIO, H20(1) + 402(g)
4
0.32
0.90
61. CH,CO.C H,(aq) +
NAOH(aq) CH CO,Na(aq)+C,H,OH(aq)
55. How are the experiments n and m
62.
determined?
A. From the stoichiometry of the balanced
equation.
Questions 63 -67.
The order of reaction with respect to a reactant
B. By maintaining the concentration of
COlg) constant.
C. By maintaining concentration of NO (g)
can be
A
B. 1
C 2
D. 3
constant.
Pick out from the orders A - D the one that gives
the following experimental bbservations.
63
D. Experimentally.
When concentration of the reactant is
halved, the initial rate of the reaction is
multiplied by one eight.
64. The initial çate quadruples when the
concentration is quadrupled.
65. When concentralion triples the reaction does
not alter.
66 When the cuncentration is quintupled the
initiel rate of reaction is muluiclied twenty five
56. What is the order of the reaction with respect
to (NO,(9)?
A. 1
B. 0
C. 2
D. 3
57. If change in concentration of COlg) did affect
the reaction rate, the value and units of the
rale constant will be
A. 0.27 mol 'dm 's
B. 0.067mol 'dm's
C. 0.44 mol 'dm's
D. 0.133mol'dms
times
67. Th inilial rate doubles when the
concenti ation is doubled.
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