Non-polar compounds - insolubility

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• A non-polar molecule has uniform distribution of electrons.
• Non-polar compounds like fatty acids in lipids have a high proportion of carbon and hydrogen.
• Lipids possess no charge or partial charge.
• Lipids are not attracted to water molecules.
• Lipids are not soluble in water.

Phospholipids - water barrier
■ Lipids are important components of the cell membrane.
■ Lipids separate two watery solutions without dissolving.
■ The hydrophobic, non-polar lipid tail moves away from the water inside and outside of the cell.
■ The hydrophilic, polar head mixes with water.
■ A double layer of phospholipids in cell membranes forms a waterproof barrier.