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Two methyl groups of the same carbon atom.

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Electron

A subatomic particle having a mass of 0.00054858 amu and a charge of 1-.

Quantum Numbers

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

Phase Diagram

Diagram that shows equilibrium temperature-pressure relationships for different phases of a substance.

Heat of Vaporization

The amount of heat required to vaporize one gram of a liquid at its boiling point with no change in temperature. Usually expressed in J/g. The molar heat of vaporization is the amount of heat required to vaporize one mole of liquid at its boiling point with no change in temperature and usually expressed ion kJ/mol.

Density

Density is the ratio b/w Mass and Volume: D=M/V

Binary Acid

A binary compound in which H is bonded to one or more of the more electronegative nonmetals.

Molality

Concentration expressed as number of moles of solute per kilogram of solvent.

Zone Refining

A method of purifying a bar of metal by passing it through an induction heater, this causes impurties to move along a melted portion. This method applies the fact when a metal crystallizes on cooling, impurities are automatically expelled as they do not form part of the crystal.

Active Metal

Metal with low ionization energy that loses electrons readily to form cations.

Dry Cells

Ordinary batteries (voltaic cells) for flashlights. radios, and so on, many are Leclanche cells.