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General chemistry
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General chemistry
Neutron activation analysis
Chemistry; General chemistry
An extremely sensitive technique for analysing trace amounts of elements in a sample. The sample is bombarded with neutrons in a nuclear reactor, making it radioactive. Different elements produce ...
Thermodynamic equilibrium
Chemistry; General chemistry
A system is at thermodynamic equilibrium if the energy it gains from its surroundings is exactly balanced by the energy it loses, no matter how much time is allowed to pass.
Calorimetry
Chemistry; General chemistry
Experimental determination of heat absorbed or released by a chemical or physical change.
Hygroscopic
Chemistry; General chemistry
Able to absorb moisture from air. For example, sodium hydroxide pellets are so hygroscopic that they dissolve in the water they absorb from the air.
Pressure
Chemistry; General chemistry
Force per unit area. The SI unit of pressure is the pascal, defined as one newton per square meter. Other common pressure units are the atmosphere , the bar , and the Torr .
Alkyl
Chemistry; General chemistry
A molecular fragment derived from an alkane by dropping a hydrogen atom from the formula. Examples are methyl (CH3) and ethyl (CH2CH3).
Endothermic
Chemistry; General chemistry
A process that absorbs heat. The enthalpy change for an endothermic process has a positive sign.
