By E. Joy Bowles
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Extra resources for Chemistry Aromatherapeutic Oils
1 continued Leaves Patchouli Pogostemon cablin Heartwood Rosewood Aniba rosaeodora Wood, bark and leaves Camphor Cinnamomum camphora Bark and leaves Cinnamon Cinnamomum zeylanicum Leaves Bay Laurus nobilis Myristicaceae Nuts Nutmeg Myristica fragrans Myrtaceae Leaves Eucalyptus Eucalyptus sp. Leaves Myrtle Myrtus communis Leaves Tea-tree Melaleuca sp. Leaves and dried buds Clove Syzygium aromaticum Oleaceae Flowers Jasmine Jasminum sp. Piperaceae Dried fruits Black Pepper Piper nigrum Pinaceae Needles Pine Pinus sp.
The electronegative atom creates an area of relative negative charge, or negative pole, and the other atoms attached, being relatively depleted of electrons, function as positive poles. These poles behave like the north and south poles on a magnet. For interested readers, any university-level organic chemistry text should be able to expand the topic of polarity further. When water molecules are together as a liquid, the positive and negative poles are attracted to each other, forming weak liaisons known as electrostatic liaisons or hydrogen bonds.
The hydrogen bonding of water forms a kind of lattice. A way of imagining hydrogen bonding between water molecules is to picture the water molecules as members of a secret society refusing admittance to anyone who cannot do the secret handshake, that is, participate in the attractions and repulsions made possible by the polarity of the molecules. Electrostatic liaisons also allow water molecules to exist in a lower energy state, increasing their stability. 2 Three water molecules with electrostatic liaisons represented by broken lines O H ␦– ␦+ H ␦+ H ␦+ ␦– O H ␦+ ␦+ H O ␦+ H ␦– Water is the only completely polar molecule we will deal with in this book.