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A thin partition between two solutions through which certain molecules can pass but others cannot.

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Chemistry of the sky

Chemistry can teach us about the composition of celestial bodies and determine their age.

Boiling Point Elevation

The increase in the boiling point of a solvent caused by the dissolution of a nonvolatile solute.

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.

Anode

In a cathode ray tube, the positive electrode. Electrode at which oxidation occurs.

Ionic Geometry

The arrangement of atoms (not lone pairs of electrons) about the central atom of a polyatomic ion.

Atom

The smallest particle of an element.

Allotropic Modifications (Allotropes)

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

Conjugated Double Bonds

Double bonds that are separated from each other by one single bond -C=C-C=C-.

Acyl Group

Compound derived from a carbonic acid by replacing the --OH group with a halogen (X), usually --Cl, general formula is O R--C--X.

Control Rods

Rods of materials such as cadmium or boron steel that act as neutron obsorbers (not merely moderaters) used in nuclear reactors to control neutron fluxes and therfore rates of fission.