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Y2O3: A white, water-insoluble powder, Y2O3, used chiefly in incandescent gas and acetylene mantles.

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Saturated Hydrocarbons

Hydrocarbons that contain only single bonds. They are also called alkanes or paraffin hydrocarbons.

Detergent

A soap-like emulsifer that contains a sulfate, SO3 or a phosphate group instead of a carboxylate group.

Positron

A Nuclear particle with the mass of an electron but opposite charge.

Phase Diagram

Diagram that shows equilibrium temperature-pressure relationships for different phases of a substance.

Ketone

Compound in which a carbonyl group is bound to two alkyl or two aryl groups, or to one alkyl and one aryl group.

Boron Hydrides

Binary compounds of boron and hydrogen.

Silicones

Polymeric organosilicon compounds, contain individual or cross-linked Si-O chains or rings in which some oxygens of SiO4 tetrahedra are replaced by other groups.

Rate-determining Step

The slowest step in a mechanism, the step that determines the overall rate of reaction.

Barometer

A device for measuring pressure.

Chemical Kinetics

The study of rates and mechanisms of chemical reactions and of the factors on which they depend.