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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Starch contains C—C, C—H, C—O, and O—H bonds. Hydrocarbons have only C—C and C—H bonds. Both starch and hydrocarbons can form colloidal dispersions in water. Which dispersion is classified as hydrophobic? Which is hydrophilic? Explain briefly.

Interpretation Introduction

Interpretation: The hydrophobic and hydrophilic bonds in starch have to be determined and the reason should be briefly explained.

Concept introduction:

Colloids: It is a homogeneous particle where one of the substances is dispersed throughout the other substance.

There are two types of colloids,

  • Hydrophilic: stable in water
  • Hydrophobic: unstable in water
Explanation

There are two types of colloids and they are hydrophilic and hydrophobic. Hydrophilic is very stable in water and forms intermolecular forces like hydrogen bond and ion-dipole forces with molecules of water. Hydrophobic are unstable in water and only gets stable by adsorbing ions on its surface.

Water is a polar solvent and nonpolar solutes do not dissolves in it. CC and CH are either nonpolar or weakly polar. Therefore, they are unstable in water and making it hydrophobic

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