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Compounds with different arrangements of groups on either side of a bond with restricted rotation, such as a double bond or a single bond in a ring, for example cis-trans isomers of certain alkenes. Stereoisomers that are not mirror images of each other, also known as position isomers.

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Double Salt

Solid consisting of two co-crystallized salts.

 

ytterbium

A rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb, at. wt.: 173.04, at. no.: 70, sp. gr.: 6.96. Cf."rare-earth element."

 

Dumas Method

A method used to determine the molecular weights of volatile liquids.

Sigma Orbital

Molecular orbital resulting from head-on overlap of two atomic orbitals.

Photon

A packet of light or electromagnetic radiation, also called quantum of light.

 

Collision Theory

Theory of reaction rates that states that effective collisions between reactant molecules must occur in order for the reaction to occur.

Atomic Orbital

Region or volume in space in which the probability of finding electrons is highest.

Anode

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

Acid Anhydride

Compound produced by dehydration of a carbonic acid. General formula is R--C--O--C--R. Chemical compound that reacts with water to form an acid and are usually oxides of nonmetallic elements.

Addition Reaction

A reaction in which two atoms or groups of atoms are added to a molecule, one on each side of a double or triple bond. Types of addition reaction include electrophilic, nucleophilic (polar) and free radical addition (non-polar).