The change in the composition of the mixture of pentane and decane left in an open beaker overnight is to be determined. Concept Introduction: The boiling point of a substance depends upon the intermolecular forces and the thermal energy of the molecules. All atoms and molecules possess dispersion forces which depend upon their molar mass. Polar molecules have dipole forces between them which depend upon the polarity of the molecules. Molecules which have a lower boiling point vaporize easily and form what are known as volatile liquids.

Question

" 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.

Answer 1

Question

Chapter 12, Problem 3SC

Interpretation Introduction

Interpretation:

The change in the composition of the mixture of pentane and decane left in an open beaker overnight is to be determined.

Concept Introduction:

The boiling point of a substance depends upon the intermolecular forces and the thermal energy of the molecules.

All atoms and molecules possess dispersion forces which depend upon their molar mass.

Polar molecules have dipole forces between them which depend upon the polarity of the molecules.

Molecules which have a lower boiling point vaporize easily and form what are known as volatile liquids.

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" 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.

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