The Hydrophobic Mystery Discovering the Nature of Silicones

Silicones consist of two non-polar methyl groups and two polar hydroxyl groups, making them insoluble in water due to electrostatic repulsions. They are thermally stable, resistant to oxidation, and have a high dielectric constant. Silicones are used in grease, surgical instruments, seals, electric motors, and enamel paints.

What makes silicones insoluble in water?

• Presence of polar hydroxyl groups

• Electrostatic attraction with water molecules

• Electrostatic repulsions from methyl groups

• High thermal stability

What is the role of methyl groups in the interaction of silicones with water?

• They attract water molecules

• They repel water molecules

• They dissolve in water

• They oxidize in water

Which of the following is NOT a property of silicones?

• Thermal stability

• Resistance to oxidation

• Hydrophobic nature

• Low dielectric constant

Silicones are used in electric motors primarily because they act as:

• Oxidizing agents

• Conductors

• Insulators

• Lubricants

Which of the following applications does NOT involve the use of silicones?

• Grease preparation

• Food packaging

• Enamel paints

• Surgical instruments