Which of the Following Statements is True Concerning Abc Below

Which of the Following Statements is True Concerning Abc Below




Kinetics

Examples of
Multiple Selection Questions





1.
The combustion of ethane (C2Hvi) is represented by the equation:
2CtwoH6(k) + 7Oii(g)

4COtwo(g) + 6H2O(l)

In this reaction:
(a) the rate of consumption of ethane is 7 times faster than the rate of consumption of oxygen.
(b) the rate of formation of COtwo
equals the charge per unit of germination of water.
(c) h2o is formed at a rate equal to 2-thirds the rate of formation of CO2.
(d) the rate of consumption of oxygen equals the charge per unit of consumption of h2o.
(e) CO2
is formed twice equally fast as ethane is consumed.

2.
The speed of a chemic reaction
(a) is constant no matter what the temperature is.
(b) is contained of the corporeality of contact surface of a solid involved.
(c) between gases should in all cases be extremely rapid because the average kinetic energy of the molecules is dandy.
(d) betwixt ions in aqueous solution is extremely rapid because there are no bonds that need to be broken.
(due east) varies inversely with the absolute temperature.

3.
For a reaction 2A + B

2C, with the rate equation: Charge per unit = k[A]2[B]
(a) the order with respect to A is 1 and the social club overall is 1.
(b) the order with respect to A is two and the club overall is 2.
(c) the order with respect to A is two and the lodge overall is three.
(d) the gild with respect to B is ii and the order overall is 2.
(e) the social club with respect to B is two and the order overall is 3.

4.
Given the post-obit data for this reaction:
NHfour
+(aq) + NO2


(aq)

N2(g) + 2H2O(50)

EXPT
[NHiv
+]
[NO2


]
Rate
i
0.010 One thousand 0.020 One thousand 0.020 G/south
two
0.015 M 0.020 M 0.030 M/s
3
0.010 M 0.010 M 0.005 M/s


The rate police for the reaction is:
(a) Rate = k[NH4
+][NO2


]
(b) Rate = one thousand[NH4
+]ii[NO2


]2
(c) Rate = one thousand[NH4
+]two[NO2


]
(d) Charge per unit = k[NH4
+][NO2


]2
(e) none of the above

5.
What are the units of k for the charge per unit police: Rate = thousand[A][B]2, when the concentration unit of measurement is mol/L?
(a) s
i
(b) southward
(c) L mol
1

s
1
(d) L2
mol
two

s
one
(due east) 50two
southward2
mol
2

vi.
Given: A + 3B

2C + D
This reaction is first order with respect to reactant A and second order with respect to reactant B. If the concentration of A is doubled and the concentration of B is halved, the rate of the reaction would _____ by a gene of _____.
(a) increase, ii
(b) decrease, 2
(c) increase, iv
(d) subtract, 4
(e) non change

vii.
The decomposition of carbon disulfide, CS2, to carbon monosulfide, CS, and sulfur is start lodge with k = 2.8 x ten-7
southward
1

at 1000oC.
CSii

CS + Due south

What is the one-half-life of this reaction at one thousandoC?
(a) 5.0 x 10seven
s
(b) 4.7 x 10
6

s
(c) 3.8 x 105
s
(d) half-dozen.one x 10four
due south
(e) two.5 x ten6
s

8.
The decomposition of dimethylether at 504
oC is first club with a half-life of 1570 seconds. What fraction of an initial amount of dimethylether remains later on 4710 seconds?
(a) 1/3
(b) ane/6
(c) 1/eight
(d) i/16
(e) 1/32

ix.
The half-life for a first-guild reaction is 32 s. What was the original concentration if, after 2.0 minutes, the reactant concentration is 0.062 Thousand?
(a) 0.84 M
(b) 0.069 Chiliad
(c) 0.091 1000
(d) 0.075 M
(due east) 0.13 One thousand

10.
Given that a reaction absorbs energy and has an activation energy of l kJ/mol, which of the following statements are
correct? (Hint: Draw the potential energy diagram.)
(1) The opposite reaction has an activation energy equal to 50 kJ/mol.
(2) The reverse reaction has an activation free energy less than 50 kJ/mol.
(three) The reverse reaction has an activation energy greater than 50 kJ/mol.
(4) The change in internal energy is less than zero.
(5) The modify in internal energy is greater than zip.
(a) (i) and (4)
(b) (two) and (four)
(c) (3) and (4)
(d) (two) and (5)
(e) (3) and (5)

11.
If reaction A has an activation energy of 250 kJ and reaction B has an activation free energy of 100 kJ, which of the post-obit statements
must
be correct?
(a) If reaction A is exothermic and reaction B is endothermic and so reaction A is favored kinetically.
(b) At the aforementioned temperature the rate of reaction B is greater than the rate of reaction A.
(c) The energy of reaction A must be greater than the energy of reaction B.
(d) The energy of reaction B must exist greater than the energy of reaction A.
(e) The charge per unit of reaction A at 25
oC equals the charge per unit of reaction B at 100
oC.

12.
If the activation energy in the forward direction of an elementary stride is 52 kJ and the activation energy in the reverse direction is 74 kJ, what is the free energy of reaction
Eastward for this pace?
(a) 22 kJ
(b) -22 kJ
(c) 52 kJ
(d) -52 kJ
(eastward) 126 kJ

xiii.
Suppose the reaction: A + 2B

AB2
occurs by the post-obit mechanism:

Step 1 A + B

AB
irksome
Stride 2 AB + B

ABii
fast
Overall A + 2B

AB2


The rate police expression must exist Charge per unit = _________.
(a) 1000[A]
(b) one thousand[B]
(c) k[A][B]
(d) k[B]2
(e) chiliad[A][B]2

14.
A possible mechanism for the reaction, 2A + B

C + D, is:

(1) A + A

A2
fast, equilibrium
(ii) Atwo
+ A

A3
tiresome
(iii) A3
+ B

A + C + D
fast


According to the mechanism, the rate police force will be:
(a) Charge per unit = k[A]2
(b) Rate = k[A][B]
(c) Rate = k[A]2[B]
(d) Rate = k[A]
(due east) Charge per unit = k[A]3

xv.
At 300 K, the post-obit reaction is found to obey the charge per unit law: Rate = thou[NOCl]2:
2NOCl

2NO + Cltwo

Consider the iii postulated mechanisms given below. So choose the response that lists all those that are possibly right and no others.

Mechanism one
NOCl

NO + Cl
slow
Cl + NOCl

NOClii
fast
NOCltwo
+ NO

2NO + Cl2
fast
Overall: 2NOCl

2NO + Cl2
Mechanism 2
2NOCl

NOCl2
+ NO
wearisome
NOCl2

NO + Cl2
fast
Overall: 2NOCl

2NO + Clii
Mechanism three
NOCl

NO + Cl
fast, equilibrium
NOCl + Cl

NO + Cl2
irksome
Overall: 2NOCl

2NO + Clii

(a) 2, three
(b) 3
(c) 1
(d) 2
(e) ane, 2

16.
A correct reaction machinery for a given reaction usually is:
(a) the same as its balanced chemical equation.
(b) obvious if its heat of reaction is known.
(c) obvious if its reaction order is known.
(d) sometimes difficult to prove.
(e) obvious if its activation energy is known.

17.
Suppose the activation energy of a certain reaction is 250 kJ/mol. If the rate constant at T1
= 300 K is chiliad1
and the rate constant at T2
= 320 K is ktwo, then the reaction is __ times faster at 320 K than at 300 K. (Hint: Solve for k2/k1.)
(a) 3 10 10
29
(b) 0.067
(c) 15.0
(d) 525
(e) iii 10 10
28

18.
What is the activation energy (in kJ) of a reaction whose charge per unit abiding increases past a factor of 100 upon increasing the temperature from 300 K to 360 Yard?
(a) 27
(b) 35
(c) 42
(d) 53
(e) 69

19.
Most reactions are more rapid at high temperatures than at low temperatures. This is
consistent
with:
(I) an increase in the activation energy with increasing temperature.
(II) an increase in the rate constant with increasing temperatures.
(Iii) an increase in the percentate of “high energy” collisions with increasing temperature.
(a) simply I
(b) but II
(c) but Iii
(d) just I and II
(e) only II and III

20.
Which items correctly complete the following statment?
A goad tin human activity in a chemic reaction to:
(I) increase the equilibrium constant.
(Ii) lower the activation free energy.
(III) decrease
E for the reaction.
(IV) provide a new path for the reaction.
(a) only I & II
(b) simply Two & III
(c) only III & IV
(d) only I & Iii
(eastward) just Two & 4

21.
A goad:
(a) really participates in the reaction.
(b) changes the equilibrium concentration of the products.
(c) does not affect a reaction free energy path.
(d) ever decreases the rate for a reaction.
(e) always increases the activation energy for a reaction.

22.
Which statement is
imitation?
(a) If a reaction is thermodynamically spontaneous information technology may occur chop-chop.
(b) If a reaction is thermodynamically spontaneous it may occur slowly.
(c) Activation energy is a kinetic quantity rather than a thermodynamic quantity.
(d) If a reaction is thermodynamically nonspontaneous, it will not occur spontaneously.
(e) If a reaction is thermodynamically spontaneous, it must have a low activation energy.

23.
Which of the following statements are
true?
(1) Reactions with more negative values of
Go
are spontaneous and proceed at a higher rate than those with less negative values of
Go.
(2) The activation energy, Ea, is commonly about the aforementioned as
E for a reaction.
(three) The activation energy for a reaction does not alter significantly every bit temperature changes.
(4) Reactions normally occur at faster rates at college temperatures.
(a) 1, two, 4
(b) 3, 4
(c) ane, two, 3
(d) 2, 3, 4
(east) one, 2, 3, 4

24.
When the concentration of reactant molecules is increased, the charge per unit of reaction increases. The best explanation is: As the reactant concentration increases,
(a) the average kinetic energy of molecules increases.
(b) the frequency of molecular collisions increases.
(c) the rate constant increases.
(d) the activation energy increases.
(e) the guild of reaction increases.

25.
For the reaction, 2H2Due south(grand) + Oii(g)

2S(s) + 2H2O(fifty), which one of the following statements is
absolutely
true?
(a) The reaction is first order with respect to HiiDue south and 2d order with respect to O2.
(b) The reaction is fourth order overall.
(c) The rate law is: rate = k[H2S]ii[Oii].
(d) The charge per unit police is: rate = k[HiiSouth][O2].
(e) The rate law cannot be determined from the information given.


Answers:

1.
(e)
2.

(d)
three.
(c)
iv.
(d)
v.

(d)
6.
(b)
seven.
(e)
8.

(c)
9.

(a)
10.
(d)
11.
(b)
12.
(b)
xiii.
(c)

14.

(e)
15.
(d)
16.
(d)
17.
(d)
eighteen.

(e)

19.

(e)
20.
(e)
21.
(a)
22.
(e)
23.
(b)

24.

(b)

25.

(e)




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To study any corrections, please e-mail Dr. Wendy Keeney-Kennicutt.


Which of the Following Statements is True Concerning Abc Below

Source: https://www.chem.tamu.edu/class/fyp/mcquest/ch16.html

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