Questions 77 -81. The following are some instruments used to follow up the rale of reaction. A Spectrophotometer B. Manometer B. Polarimeter D. None of the above Select from A to D the instrument that can tbe used to follow-up the rate of the reaclion. 77. CH,(g) + Br (aq) -CH,Br,(aq) 78. 20.(9) -30 (g) 79. NO2(g) + CO99) NO(g) + co2(g) 80 H2(g) + F2(g) 2HF(s) 81C H O, (aq)-H,00)>C,H,O,(aq)fC HO (aq) sucrose glucose fructose
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 Q79, 80 & 81
![Questions 77-81.
The following are some instruments used to follow
up the rale of reaction.
A. Spectrophotometer
B. Manometer
B. Polarimeter
D. None of the above
Questions 68 - 71.
The following are some types of catalysis most
often used to alter rates of chemical reactions.
A Heterogeneous calalysis.
B. Autocatalysis
C. Homogeneous catalysis
D. Inhibition catalysis.
Select from Ato Dthe instrument that can be used
to follow-up the rate of the reaclion.
77. CH(9) + Br(aq) CHBR (aq)
78. 20.(g) -- 30 (g)
79. NO2(g) + c09g) NO(g) + CO2(g)
80 H2(g) + F2(g)
81C H O (aq)+H O(1)>C,H,0,(aq)fC,H O (ag)
Select from the list A to D the ype of calalysis that
the underlined substance is in the following
raaction.
68 Alumina alters the rate of dehydration of
ethanol to ethene.
69. manganese (II) ions alters the rate of the
reaction
2HF(g)
glucose
fructose
2MNO (aq)+6H (aq)+5H.0(aq) >
2Mn (aq)+50 (g)+8H,0().
as soon as a trace amounl of manganese
(I1) ions appear in the reaction medium.
70. Hydrogen ions alter the rate of the reaction
between iodine and propenone.
71. fron (II) ions alter the rate of the reaction
between iodide ions and peroxodisulphate
fons.
sucrose
Questions 82 - 89 concern the graphs below.
Questions 72 - 76.
The following are some terms used in reaction
kinelics.
A. Rate determining step
B. Molecularity
C. Order of reaction.
D. Elementary reactions.
Select from A-D the term that most suits
72. a sequence of individual step(s) which
together make up the proposed reaction
mechanism.
73. the number of reacting species that take part
Select the graph which represents a plot of
82. the half-life (y-axis) against concentration for
a first order reaction.
in a reaction step.
74 the number to which the concentrations of
reactants are raised in the rate expression.
75. the reaction steps that limits how fast the
overali reaction proceeds.
The step in the reaction mechanism whose
rate law is identical to the rate law of the
83.
the rate of react
(y-axis) against
concentration for a zero order reaction.
84. the half-life (y-axis) against concentration for
a zero order reaction.
85. the concentration (y-axis) against time for
zero order reaction.
86. the rate constant (k) (y-axis) against the
absolube temperature.
87. the In of rate constant (y-axis) against the
inverse of the absolute temperature.
88. the rate of reaction (y-axis) agains!
concertration for a second order reaction
89. the rate of reaction (y-axis) against
concentration for a second Grder eaction.
76
overal reaction.
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