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The absolute entropy of a substance in its standard state at 298 K.

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Nucleus

The very small, very dense, positively charged center of an atom containing protons and neutrons, as well as other subatomic particles.

Valence Shell Electron Pair Repulsion Theory

Assumes that electron pairs are arranged around the central element of a molecule or polyatomic ion so that there is maximum separation (and minimum repulsion) among regions of high electron density.

 

Equation of State

An equation that describes the behavior of matter in a given state, the van der Waals equation describes the behavior of the gaseous state.

Standard Molar Volume

The volume occupied by one mole of an ideal gas under standard conditions, 22.4liters.

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Ionization Constant

Equilibrium constant for the ionization of a weak electrolyte.

Capillary

A tube having a very small inside diameter.

Heavy Water

Water containing deuterium, a heavy isotope of hydrogen.

Beta Particle

Electron emitted from the nucleus when a neuton decays to a proton and an electron.

Bubbles

Have you ever noticed that soap bubbles go up in winter and fall down in summer? The reason is that warm air is lighter than cold. And in winter the difference between the air temperature in the room (especially near the windows) and the one you exhale into the bubble is enough to overcome the heaviness of its shell.