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Refers to substances that crystallize in more than one crystalline arrangement.

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Double Salt

Solid consisting of two co-crystallized salts.

 

Plasma

A physical state of matter which exists at extremely high temperatures in which all molecules are dissociated and most atoms are ionized.

Critical Pressure

The pressure required to liquefy a gas (vapor) at its critical temperature.

Deposition

The direct solidification of a vapor by cooling, the reverse of sublimation.

Ion

An atom or a group of atoms that carries an electric charge.

Diamagnetism

Weak repulsion by a magnetic field.

Bubbles

Have you ever noticed that soap bubbles go up in winter and fall down in summer? The reason is that warm air is lighter than cold. And in winter the difference between the air temperature in the room (especially near the windows) and the one you exhale into the bubble is enough to overcome the heaviness of its shell.

Rate of Reaction

Change in the concentration of a reactant or product per unit time.

Square Planar

A term used to describe molecules and polyatomic ions that have one atom in the center and four atoms at the corners of a square.

Nuclides

Refers to different atomic forms of all elements in contrast to ?isotopes?, which refer only to different atomic forms of a single element.