Principles of General Chemistry
Principles of General Chemistry
3rd Edition
ISBN: 9780073402697
Author: SILBERBERG, Martin S.
Publisher: McGraw-Hill College
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Chapter 4, Problem 4.1P

(Sample Problems 4.1 and 4.2)

4.1 What two factors cause water to be polar?

Expert Solution & Answer
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Interpretation Introduction

Interpretation: Two factors that cause polarity in H2O should be determined.

Concept introduction: Solution is made by two portions, solute, and solvent. Solute represents substance present in small quantity while solvent represents substance that dissolves solute.

Polarity in molecule is generated if it has unequal distributed electron density between bonds. Polar molecule has partial charges on atoms of the molecule. The general representation of polar molecule is as follows:

  Principles of General Chemistry, Chapter 4, Problem 4.1P , additional homework tip  1

Here, B has high electronegative value than A.

Explanation of Solution

Water molecule has bend shape. In this shape, oxygen present as central atom and two hydrogen atoms are present as side atom. Structure of H2O molecule is as follows:

  Principles of General Chemistry, Chapter 4, Problem 4.1P , additional homework tip  2

Bond OH present in water molecule has more electronegative oxygen atom and less electronegative hydrogen atom. Therefore, oxygen atom would attract bonding electrons towards it and acquires partially negative charge. Since electrons moved away from hydrogen thus it acquires partially positive charge. This unequal distribution of bonding electrons in OH bond makes H2O molecule polar in nature.

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Chapter 4 Solutions

Principles of General Chemistry

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