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A colorless, crystalline pentose sugar, C5H10O5, derived from xylan, straw, corncobs, etc., by treating with heated dilute sulfuric acid, and dehydrating to furfural if stronger acid is used.

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Temperature

A measure of the intensity of heat, i.e. the hotness or coldness of a sample. or object.

Essential Oil

A plant extract that has a distinctive odour or flavour.

Hydrocarbons

Compounds that contain only carbon and hydrogen.

Phenol

Hydrocarbon derivative containing an [OH] group bound to an aromatic raing.

 

Crystal Field Theory

Theory of bonding in transition metal complexes in which ligands and metal ions are treated as point charges, a purely ionic model, ligand point charges represent the crystal (electrical) field perturbing the metal?s d orbitals containing nonbonding electrons.

Surface Tension

It is the force in dynes acting along the surface of the liquid 1cm in length and perpendicular to it.

Allotropic Modifications (Allotropes)

Different forms of the same element in the same physical state.

Ozone

We breathe 24 hours a day, 7 days a week, consuming about 25 kg of air every day. It turns out that we practically predetermine our health by the air we breathe.

Weak Electrolyte

A substance that conducts electricity poorly in a dilute aqueous solution.

Periodicity

Regular periodic variations of properties of elements with atomic number (and position in the periodic table).