Have each group member look up Δ H f ° and S ° for one substance m the reaction: 3 O 2 ( g ) + 6 H 2 ( g ) + 6 C ( s , graphite ) → C 6 H 12 O 6 ( s , glucose ) . What is Δ H ° for this reaction? What is Δ S ° ? When is Δ H f ° for a substance equal to zero? When is S ° for a substance equal to zero?
Have each group member look up Δ H f ° and S ° for one substance m the reaction: 3 O 2 ( g ) + 6 H 2 ( g ) + 6 C ( s , graphite ) → C 6 H 12 O 6 ( s , glucose ) . What is Δ H ° for this reaction? What is Δ S ° ? When is Δ H f ° for a substance equal to zero? When is S ° for a substance equal to zero?
Solution Summary: The author explains how to find the H ° r x n by using the heat of formation values of each product and reactant.
Have each group member look up
Δ
H
f
°
and
S
°
for one substance m the reaction:
3 O
2
(
g
)
+
6 H
2
(
g
)
+
6 C
(
s
,
graphite
)
→
C
6
H
12
O
6
(
s
,
glucose
)
. What is
Δ
H
°
for this reaction? What is
Δ
S
°
? When is
Δ
H
f
°
for a substance equal to zero? When is
S
°
for a substance equal to zero?
" is
The structure of the bicarbonate (hydrogen carbonate) ion, HCO3-, HCO3
best described as a hybrid of several contributing resonance forms, two of which
are shown here.
HO
:0:
:Ö:
HO
+
Bicarbonate is crucial for the control of body pH (for example, blood pH:
7.4). A more self-indulgent use is in baking soda, where it serves as a
source of CO2 CO₂ 2 gas, which gives bread and pastry their fluffy
constituency.
(i) Draw at least one additional resonance form.
=
(ii) Using curved "electron-pushing" arrows, show how these Lewis structures may
be interconverted by movement of electron pairs. (iii) Determine which form or
forms will be the major contributor(s) to the real structure of bicarbonate,
explaining your answer on the basis of the criteria in Section 1-5.
Which of these is the best use of a volumetric flask?
measuring how much liquid it contains
delivering a precise amount of liquid to another container
holding solutions
making solutions of precise concentration
You're competing on a Great British television game show, and you need to bake a
cake. The quantity for each ingredient is given in grams, but you haven't been
given a kitchen scale.
Which of these properties would correlate with the mass of a baking ingredient like
eggs or milk? Check all that apply.
depth of color
viscosity
volume
density
Chapter 18 Solutions
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