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

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Standard Molar Enthalphy of Formation

The amount of heat absorbed in the formation of one mole of a substance in a specified state from its elements in their standard states.

Percent Purity

The percent of a specified compound or element in an impure sample.

Capillary

A tube having a very small inside diameter.

Cathode

Electrode at which reduction occurs in a cathode ray tube, the negative electrode.

Biodegradability

The ability of a substance to be broken down into simpler substances by bacteria.

 

Nodal Plane

A region in which the probability of finding an electron is zero.

 

Kinetic-molecular Theory

A theory, that attempts to explain macroscopic observations on gases in microscopic observations on gases in microscopic observations on gases in microscopic or molecular terms.

Metathesis Reactions

Reactions in which two compounds react to form two new compounds, with no changes in oxidation number. Reactions in which the ions of two compounds exchange partners.

 

A brief history of dyeing fabrics

 Dyeing fabrics is giving the fibers a homogeneous color that has a certain degree of strength. The methods of dyeing are very diverse, depending on the properties of the dyes and the dyed fibers.

Oil

Liquid triester of glycerol and unsaturated fatty acids.