The names of three polysaccharides that are composed of units of D-glucose should be determined. The polysaccharides in which the glucose units are joined with an alpha glycosidic bond and with beta-glycosidic bonds should be identified. Concept introduction: Carbohydrates and lipids are the energy sources. Carbohydrates are composed of carbon, hydrogen, and oxygen atoms. They are also known as saccharides because of their sweet taste. They are classified into three categories, monosaccharide, oligosaccharide, and polysaccharides.

Question

(a) Show that the lattice energies are inversely proportional to the distance between ions in MX (M = alkali metal, X = halide ions) by plotting the lattice energies of KF, KCl, and KI against the internuclear distances, dMX. The lattice energies of KF, KCl, and KI are 826, 717, and 645 kJ/mol, respectively. Does the correlation obtained correlate well? You will need to use a standard graphing program to construct the graph (such as a spreadsheet program). It will generate an equation for the line and calculate a correlation coefficient. (b) Estimate the lattice energy of KBr from your graph. (c) Find an experimental value for the lattice energy of KBr in the literature, and compare this value with the one calculated in (b). Do they agree?

Answer 1

Question

Chapter 20, Problem 20.44P

Interpretation Introduction

Interpretation:

The names of three polysaccharides that are composed of units of D-glucose should be determined. The polysaccharides in which the glucose units are joined with an alpha glycosidic bond and with beta-glycosidic bonds should be identified.

Concept introduction:

Carbohydrates and lipids are the energy sources. Carbohydrates are composed of carbon, hydrogen, and oxygen atoms. They are also known as saccharides because of their sweet taste.

They are classified into three categories, monosaccharide, oligosaccharide, and polysaccharides.

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(a) Show that the lattice energies are inversely proportional to the distance between ions in MX (M = alkali metal, X = halide ions) by plotting the lattice energies of KF, KCl, and KI against the internuclear distances, dMX. The lattice energies of KF, KCl, and KI are 826, 717, and 645 kJ/mol, respectively. Does the correlation obtained correlate well? You will need to use a standard graphing program to construct the graph (such as a spreadsheet program). It will generate an equation for the line and calculate a correlation coefficient. (b) Estimate the lattice energy of KBr from your graph. (c) Find an experimental value for the lattice energy of KBr in the literature, and compare this value with the one calculated in (b). Do they agree?

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