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The time required for half of a reactant to be converted into product(s). The time required for half of a given sample to undergo radioactive decay.

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Absolute Zero

The zero point on the absolute temperature scale, -273.15°C or 0 K, theoretically, the temperature at which molecular motion ceases. The concept of an absolute zero temperature was first deduced from experiments with gases. When a fixed volume of gas is cooled, its pressure decreases with its temperature. Absolute zero physically possesses quantum mechanical zero-point energy.

Chemistry is a familiar school subject

Everyone liked to observe the reaction of reagents. But few know interesting facts about chemistry, which we will discuss in this article.

Mass

A measure of the amount of matter in an object. Mass is usually measured in grams or kilograms.

Percentage Ionization

The percentage of the weak electrolyte that ionizes in a solution of given concentration.

Detergent

A soap-like emulsifer that contains a sulfate, SO3 or a phosphate group instead of a carboxylate group.

Coordinate Covalent Bond

A covalent bond in which both shared electrons are donated by the same atom, a bond between a Lewis base and a Lewis acid.

Curie (Ci)

The basic unit used to describe the intensity of radioactivity in a sample of material. One curie equals 37 billion disintegrations per second or approximately the amount of radioactivty given off by 1 gram of radium.

PseudobinaryIonic Compounds

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

Differential Thermometer

A thermometer used for accurate measurement of very small changes in temperature.

Doublet

Two peaks or bands of about equal intensity appearing close together on a spectrogram.