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General chemistry

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General chemistry

Ideal gas

Chemistry; General chemistry

A gas whose pressure P, volume V, and temperature T are related by PV = nRT, where n is the number of moles of gas and R is the ideal gas law constant . Ideal gases have molecules with negligible ...

Pseudocore

Chemistry; General chemistry

Electrons in d or f subshells which are outside the noble gas core .

Allotrope

Chemistry; General chemistry

Some elements occur in several distinct forms called allotropes. Allotropes have different chemical and physical properties. For example, graphite and diamond are allotropes of carbon.

Enthalpy of fusion

Chemistry; General chemistry

The change in enthalpy when one mole of solid melts to form one mole of liquid. Enthalpies of fusion are always positive because melting involves overcoming some of the intermolecular attractions in ...

Nonelectrolyte

Chemistry; General chemistry

A nonelectrolyte is a substance which does not ionise in solution.

Third law

Chemistry; General chemistry

The entropy of a perfect crystal is zero at absolute zero .

Carbonate hardness

Chemistry; General chemistry

Water hardness due to the presence of calcium and magnesium carbonates and bicarbonates. The "noncarbonate hardness" is due mostly to calcium and magnesium sulfates, chlorides, and nitrates.

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