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General chemistry
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General chemistry
Ideal gas law constant
Chemistry; General chemistry
A constant R equal to PV/(nT) for ideal gases , where the pressure, volume, moles, and temperature of the gas are P, V, n, and T, respectively. The value and units of R depend on the units of P, V, ...
Pure substance
Chemistry; General chemistry
A sample of matter that cannot be separated into simpler components without chemical change . Physical changes can alter the state of matter but not the chemical identity of a pure substance. Pure ...
Allyl
Chemistry; General chemistry
A molecular fragment derived by removing a methyl hydrogen from propene (-CH2-CH2=CH2). For example, "allyl chloride" is 3-chloropropene, Cl-CH2-CH2=CH2.
Enthalpy of hydration
Chemistry; General chemistry
The change in enthalpy for the process A(g) -> A(aq) where the concentration of A in the aqueous solution approaches zero. Enthalpies of hydration for ions are always negative because strong ...
Molar mass
Chemistry; General chemistry
The mass of one mole of a material. For example, the molar mass of H2O is 18.015 g (obtained by adding twice the molar mass of hydrogen to the molar mass of oxygen).
Sulphurous acid
Chemistry; General chemistry
A colourless liquid that acts as a weak acid when dissolved in water, sometimes used as a bleach. Salts of sulphurous acid are called sulfites .
Activation energy
Chemistry; General chemistry
The minimum energy required to convert reactants into products; the difference between the energies of the activated complex and the reactants.
