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General chemistry
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General chemistry
Gel
Chemistry; General chemistry
A gell is a sol in which the solid particles fuse or entangle to produce a rigid or semirigid mixture. For example, gelatin dissolved in water produces a sol of protein molecules. When the gelatin ...
Periodic table
Chemistry; General chemistry
An arrangement of the elements according to increasing atomic number that shows relationships between element properties.
Vulcanization
Chemistry; General chemistry
A process of combining rubber with sulphur or other substances that causes the polymer chains to crosslink, making them stronger and more elastic.
Coulomb
Chemistry; General chemistry
The SI unit of electric charge, equal to the amount of charge delivered by a current of 1 ampere running for 1 second. One mole of electrons has a charge of about 96487 C.
Lanthanide contraction
Chemistry; General chemistry
An effect that causes sixth period elements with filled 4f subshells to be smaller than otherwise expected. The intervention of the lanthanides increases the effective nuclear charge, which offsets ...
Significant figure
Chemistry; General chemistry
A convention for recording measurements. Measurements are rounded so that they contain only the digits up to and including the first uncertain digit, when the number is written in scientific ...
Auto-ignition temperature
Chemistry; General chemistry
Minimum temperature at which the vapor/air mixture over a liquid spontaneously catches fire.