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The rates of effusion of gases are inversely proportional to the square roots of their molecular weights or densities.

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Dipole-dipole Interactions

Attractive interactions between polar molecules, that is, between molecules with permanent dipoles.

History of fireworks

There is an assumption that the history of fireworks started in China, about 2000 years ago. It is possible that the Chinese accidentally discovered explosions by burning bamboo canes.

End Point

The point at which an indicator changes colour and a titration is stopped.

Electrical Conductivity

Ability to conduct electricity.

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.

Barometer

A device for measuring pressure.

Atmosphere

A unit of pressure, the pressure that will support a column of mercury 760 mm high at 0 °C.

Raoult's Law

The vapor pressure of a solvent in an ideal solution decreases as its mole fraction decreases.

Electrodes

Surfaces upon which oxidation and reduction half-reactions, occur in electrochemical cells.

Diagonal Similarities

Refers to chemical similarities in the Periodic Table of elements of Period 2 to elements of Period 3 one group to the right, especially evident toward the left of the periodic table.