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Hydrocarbons that contain double or triple carbon-carbon bonds.

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Percent by Mass

100% times the actual yield divided by theoretical yield.

Metal

An element below and to the left of the stepwise division (metalloids) in the upper right corner of the periodic table, about 80% of the known elements are metals.

Percent Purity

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

xylan

The pentosan occurring in woody tissue that hydrolyzes to xylose: used as a source of furfural.

Stereoisomers

Isomers that differ only in the way that atoms are oriented in space, consist of geometrical and optical isomers.

 

Bond Energy

The amount of energy necessary to break one mole of bonds of a given kind (in gas phase).The amount of energy necessary to break one mole of bonds in a substance, dissociating the sustance in the gaseous state into atoms of its elements in the gaseous state.

Crystal Lattice

A pattern of arrangement of particles in a crystal.

Amphoterism

The ability to react with both acids and bases.Ability of substance to act as either an acid or a base.

Alpha Particles

A helium nucleus.

Fat

Solid triester of glycerol and (mostly) saturated fatty acids.