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

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Stoichiometry

Description of the quantitative relationships among elements and compounds as they undergo chemical changes.

Avogadro's Law

At the same temperature and pressure, equal volumes of all gases contain the same number of molecules.

Heterogeneous Equilibria

Equilibria involving species in more than one phase.

Hydride

A binary compound of hydrogen.

 

Molarity

Number of moles of solute per litre of solution.

Hard Water

Water containing Fe3+, Ca2+, and Mg2+ ions, which forms precipates with soap.

D -Transition elements (metals)

B Group elements except IIB in the periodic table, sometimes called simply transition elements EX. Fe, Ni, Cu, Ti .
For further information see Metals.

Pairing

A favourable interaction of two electrons with opposite m , values in the same orbital.

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.

Quantum Numbers

Numbers that describe the energies of electrons in atoms, derived from quantum mechanical treatment.