On one graph, plot the effective nuclear charge (shown in parentheses) and atomic radius (see Figure 7.6 ) versus atomic number for the second-period elements: Li ( 1 .28 ) , Be ( 1 .91 ) , B ( 2 .42 ) , C ( 3 .14 ) , N ( 3 .83 ) , O ( 4 .45 ) , F ( 5 .10 ) , Ne ( 5 .76 ) . Comment on the trends.
On one graph, plot the effective nuclear charge (shown in parentheses) and atomic radius (see Figure 7.6 ) versus atomic number for the second-period elements: Li ( 1 .28 ) , Be ( 1 .91 ) , B ( 2 .42 ) , C ( 3 .14 ) , N ( 3 .83 ) , O ( 4 .45 ) , F ( 5 .10 ) , Ne ( 5 .76 ) . Comment on the trends.
Solution Summary: The author explains that effective nuclear charge increases across a period due to increase in number of valence electrons.
On one graph, plot the effective nuclear charge (shown in parentheses) and atomic radius (see Figure 7.6) versus atomic
number for the second-period elements:
Li
(
1
.28
)
, Be
(
1
.91
)
, B
(
2
.42
)
, C
(
3
.14
)
, N
(
3
.83
)
, O
(
4
.45
)
, F
(
5
.10
)
, Ne
(
5
.76
)
. Comment on the trends.
Definition Definition Number of protons in the nucleus of an atom. It uniquely identifies an element, as the number of protons determines the element's properties. The periodic table of elements is arranged based on increasing atomic numbers, allowing scientists to easily locate and study elements.
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy
AS.
Note: if you have not been given enough information to decide a sign, select the "unknown" option.
reaction
observations
conclusions
ΔΗ is
(pick one)
A
This reaction is faster above 103. °C than
below.
AS is
(pick one)
ΔΗ is
(pick one)
B
This reaction is spontaneous only above
-9. °C.
AS is
(pick one)
ΔΗ is
(pick one)
C
The reverse of this reaction is always
spontaneous.
AS is
(pick one)
18
Ar
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy
AS.
Note: if you have not been given enough information to decide a sign, select the "unknown" option.
reaction
observations
conclusions
A
The reverse of this reaction is always
spontaneous but proceeds slower at
temperatures below 41. °C.
ΔΗ is
(pick one)
AS is
(pick one)
ΔΗ is
(pick one)
B
This reaction is spontaneous except above
94. °C.
AS is
(pick one)
This reaction is always spontaneous, but
ΔΗ is
(pick one)
C
proceeds slower at temperatures below
−14. °C.
AS is
(pick one)
Х
00.
18
Ar
무ㅎ
B
1
1
Draw the product of the reaction shown below. Ignore inorganic
byproducts.
+
H
CH3CH2OH
HCI
Drawing
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