Chemistry In Focus
7th Edition
ISBN: 9781337670425
Author: Tro
Publisher: Cengage
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Textbook Question
Chapter 9, Problem 5SC
When two solutions are mixed in a beaker, a reaction occurs, and the temperature drops. Is the reaction exothermic or endothermic? Is the sign of
exothermic; negative
exothermic; positive
endothermic; negative
endothermic; positive
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A 25.0 g sample of water was cooled from 23.9°C to 12.7°C, how much heat was released? (Assume thatthe specific heat of water is 4.18 J/g °C)
Zeolites: environmental applications.
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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
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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.
Chapter 9 Solutions
Chemistry In Focus
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