
Chemistry for Changing Times
14th Edition
ISBN: 9780134212777
Author: John W. Hill; Terry W. McCreary
Publisher: Pearson Education (US)
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Question
Chapter 11, Problem 4CGP
Interpretation Introduction
Interpretation: We have to explain how positron is a particle of antimatter.
Concept introduction: Antimatter refers the subatomic particles of the ordinary matter with same mass and composition, but opposite electrical charge and magnetic moment. Positron is the particle of antimatter of negatively charged electron.
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14. The following diagrams represent
hypothetical membrane structures with
their components numbered from 1 to 6.
Based on the figures and your knowledge
of biological membranes, select the
correct alternative.
|
3
5
||
人
2
500000
6
A) Structures 1, 3, 5, 2 and 4 are present
in a constantly fluid arrangement that
allows the selectivity of the movement
○ of molecules. Structure 4, present
integrally or peripherally, is responsible
for this selection, while the quantity of 6
regulates the fluidity.
B) The membranes isolate the cell from
the environment, but allow the passage
of water-soluble molecules thanks to
the presence of 2 and 3. The membrane
in scheme is more fluid than that in
55
12. Mark the correct statement about
reactions a and b :
a.
Br
+ -OH
Br
b.
+ Br
H₂O
+
Br
-OH
+
H₂O
A) The reactions are elimination
reactions, with reaction "a" being of type
E2 and reaction "b" being of type E1.
B) Reaction "a" is an E2 type elimination
occurring in one step and reaction "b" is
an SN1 type substitution.
C) Both reactions can result in the
formation of carbocation, but in reaction
"b" the most stable carbocation will be
formed.
D) Both reactions occur at the same rate
○ and have the same number of reaction
steps.
E) Reaction "b" is an E2 type elimination
occurring in two steps and reaction "a" is
an SN2 type substitution.
Chloroform, long used as an anesthetic and now considered carcinogenic, has a heat of vaporization of 31.4 kJ/mol. During vaporization, its entropy increases by 94.2 J/mol.K. Therefore, select the alternative that indicates the temperature, in degrees Celsius, at which chloroform begins to boil under a pressure of 1 atm.
A) 28
B) 40
C) 52
D) 60
E) 72
Chapter 11 Solutions
Chemistry for Changing Times
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