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A compound consisting of three elements, may be ionic or covalent.

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Nonpolar Bond

Covalent bond in which electron density is symmetrically distributed.

Geometrical Isomers

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.

Enzyme

A protein that acts as a catalyst in biological systems.

Reactants

Substances consumed in a chemical reaction.

Viscosity

Resistance offered by the molecules of a liquid to flow is termed as viscosity.

Semipermable Membrane

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

Frequency

The number of repeating corresponding points on a wave that pass a given observation point per unit time.

Molecular Orbital Theory

A theory of chemical bonding based upon the postulated existence of molecular orbitals.

Lanthanide Contraction

A decrease in the radii of the elements following the lanthanides compared to what would be expected if there were no f-transition metals.

Salt Bridge

A U-shaped tube containing electrolyte, which connects two half-cells of a voltaic cell.