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The very small, very dense, positively charged center of an atom containing protons and neutrons, as well as other subatomic particles.

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Flammable

A liquid as defined by NFPD and DOT as having a flash point below 37.8°C (100°F).

Hydrometer

A device used to measure the densities of liquids and solutions.

Solution

Homogeneous mixture of two or more substances.

Allotropic Modifications (Allotropes)

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

Peroxide

A compound containing oxygen in the -1 oxidation state. Metal peroxides contain the peroxide ion, O22

Electronegativity

A measure of the relative tendency of an atom to attract electrons to itself when chemically combined with another atom.

Organic Chemistry

The chemistry of substances that contain carbon-hydrogen bonds.

Percent Purity

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

Hydrophilic Colloids

Colloidal particles that repel water molecules.

Double Salt

Solid consisting of two co-crystallized salts.