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At constant temperature and pressure, the volumes of reacting gases (and any gaseous products) can be expressed as ratios of small whole numbers.

 

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First Law of Thermodynamics

The total amount of energy in the universe is constant (also known as the Law of Conservation of Energy) energy is neither created nor destroyed in ordinary chemical reactions and physical changes.

Solute

The dispersed (dissolved) phase of a solution.

Critical Mass

The minimum mass of a particular fissionable nuclide in a given volume required to sustain a nuclear chain reaction.

Radioactive Dating

Method of dating ancient objects by determining the ratio of amounts of mother and daughter nuclides present in an object and relating the ratio to the object?s age via half-life calculations.

Deposition

The direct solidification of a vapor by cooling, the reverse of sublimation.

PseudobinaryIonic Compounds

Compounds that contain more than two elements but are named like binary compounds.

van der Waals' Equation

An equation of state that extends the ideal gas law to real gases by inclusion of two empirically determined parameters, which are different for different gases.

Saponification

Hydrolysis of esters in the presence of strong soluable bases.

Entropy

A thermodynamic state or property that measures the degree of disorder or randomness of a system.

Alkaline Battery

A dry cell in which the electrolyte contains KOH.