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General chemistry
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General chemistry
Deuterium
Chemistry; General chemistry
An isotope of hydrogen that contains one neutron and one proton in its nucleus.
Mass spectrometer
Chemistry; General chemistry
An instrument that measures the masses and relative abundances of a sample that has been vaporised and ionized.
Standard molar entropy
Chemistry; General chemistry
The entropy of one mole of a substance in its standard state .
Bond enthalpy
Chemistry; General chemistry
Enthalpy change per mole when a bond is broken in the gas phase for a particular substance.
Humectant
Chemistry; General chemistry
A substance that absorbs or retains moisture, added to a product to keep it from drying out.
Polarity
Chemistry; General chemistry
A property associated with molecules when the centre of positive charge and the centre of negative charge don't coincide. See also polar molecule and polar bond .
Zwitterion
Chemistry; General chemistry
A particle that contains both positively charged and negatively charged groups. For example, amino acids (NH2-CHR-COOH) can form zwitterions (+NH3-CHR-COO-)
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